Metadata
| Key | Value |
|---|---|
| engine | transformers |
| prompt | completion |
| temp | 0.2 |
| top_p | 0.95 |
| max_new_tokens | 1024 |
| n_completions | 10 |
Solutions
typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
func parse(string: String) throws -> JSON {
do {
let data = string.data(using: .utf8)!
let json = try JSONSerialization.jsonObject(with: data, options: []) as! JSON
return json
} catch {
throw ParsingError.internalError(error)
}
}
func parse(data: Data) throws -> JSON {
do {
let json = try JSONSerialization.jsonObject(with: data, options: []) as! JSON
return json
} catch {
throw ParsingError.internalError(error)
}
}
func parse(url: URL) throws -> JSON {
do {
let data = try Data(contentsOf: url)
let json = try JSONSerialization.jsonObject(with: data, options: []) as! JSON
return json
} catch {
throw ParsingError.internalError(error)
}
}```swift
typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
// JSON parser, returns custom error type in case of failures.
func parse(string: String) throws -> JSON {
do {
let data = string.data(using: .utf8)!
let json = try JSONSerialization.jsonObject(with: data, options: []) as! JSON
return json
} catch {
throw ParsingError.internalError(error)
}
}
// JSON parser, returns custom error type in case of failures.
func parse(data: Data) throws -> JSON {
do {
let json = try JSONSerialization.jsonObject(with: data, options: []) as! JSON
return json
} catch {
throw ParsingError.internalError(error)
}
}
// JSON parser, returns custom error type in case of failures.
func parse(url: URL) throws -> JSON {
do {
let data = try Data(contentsOf: url)
let json = try JSONSerialization.jsonObject(with: data, options: []) as! JSON
return json
} catch {
throw ParsingError.internalError(error)
}
}
```typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
func parse(string: String) throws -> JSON {
guard let data = string.data(using: .utf8) else {
throw ParsingError.invalidInput
}
do {
return try JSONSerialization.jsonObject(with: data, options: []) as! JSON
} catch {
throw ParsingError.internalError(error)
}
}
func serialize(json: JSON) throws -> String {
do {
let data = try JSONSerialization.data(withJSONObject: json, options: [])
return String(data: data, encoding: .utf8)!
} catch {
throw ParsingError.internalError(error)
}
}```swift
typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
// JSON parser, returns custom error type in case of failures.
func parse(string: String) throws -> JSON {
guard let data = string.data(using: .utf8) else {
throw ParsingError.invalidInput
}
do {
return try JSONSerialization.jsonObject(with: data, options: []) as! JSON
} catch {
throw ParsingError.internalError(error)
}
}
// JSON serializer, returns custom error type in case of failures.
func serialize(json: JSON) throws -> String {
do {
let data = try JSONSerialization.data(withJSONObject: json, options: [])
return String(data: data, encoding: .utf8)!
} catch {
throw ParsingError.internalError(error)
}
}
// Example usage
do {
let json = try parse(string: "{\"key\": \"value\"}")
print(json)
let string = try serialize(json: json)
print(string)
} catch ParsingError.invalidInput {
print("Invalid input")
} catch ParsingError.internalError(let error) {
print("Internal error: \(error)")
}
```typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
func parse(string: String) throws -> JSON {
do {
return try JSONSerialization.jsonObject(with: string.data(using: .utf8)!, options: []) as! JSON
} catch {
throw ParsingError.internalError(error)
}
}
func parse(data: Data) throws -> JSON {
do {
return try JSONSerialization.jsonObject(with: data, options: []) as! JSON
} catch {
throw ParsingError.internalError(error)
}
}
func parse(url: URL) throws -> JSON {
do {
return try JSONSerialization.jsonObject(with: try Data(contentsOf: url), options: []) as! JSON
} catch {
throw ParsingError.internalError(error)
}
}```swift
typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
// JSON parser, returns custom error type in case of failures.
func parse(string: String) throws -> JSON {
do {
return try JSONSerialization.jsonObject(with: string.data(using: .utf8)!, options: []) as! JSON
} catch {
throw ParsingError.internalError(error)
}
}
// JSON parser, returns custom error type in case of failures.
func parse(data: Data) throws -> JSON {
do {
return try JSONSerialization.jsonObject(with: data, options: []) as! JSON
} catch {
throw ParsingError.internalError(error)
}
}
// JSON parser, returns custom error type in case of failures.
func parse(url: URL) throws -> JSON {
do {
return try JSONSerialization.jsonObject(with: try Data(contentsOf: url), options: []) as! JSON
} catch {
throw ParsingError.internalError(error)
}
}
```typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
func parse(string: String) throws -> JSON {
do {
let data = string.data(using: .utf8)!
let json = try JSONSerialization.jsonObject(with: data, options: []) as! JSON
return json
} catch {
throw ParsingError.internalError(error)
}
}
func serialize(json: JSON) throws -> String {
do {
let data = try JSONSerialization.data(withJSONObject: json, options: [])
return String(data: data, encoding: .utf8)!
} catch {
throw ParsingError.internalError(error)
}
}```swift
typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
// JSON parser, returns custom error type in case of failures.
func parse(string: String) throws -> JSON {
do {
let data = string.data(using: .utf8)!
let json = try JSONSerialization.jsonObject(with: data, options: []) as! JSON
return json
} catch {
throw ParsingError.internalError(error)
}
}
// JSON serializer, returns custom error type in case of failures.
func serialize(json: JSON) throws -> String {
do {
let data = try JSONSerialization.data(withJSONObject: json, options: [])
return String(data: data, encoding: .utf8)!
} catch {
throw ParsingError.internalError(error)
}
}
// Example usage:
do {
let json = try parse(string: "{\"key\": \"value\"}")
print(json)
let serialized = try serialize(json: json)
print(serialized)
} catch ParsingError.invalidInput {
print("Invalid input")
} catch ParsingError.internalError(let error) {
print("Internal error: \(error)")
}
```typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
func parse(string: String) throws -> JSON {
do {
let data = string.data(using: .utf8)!
let json = try JSONSerialization.jsonObject(with: data, options: []) as! JSON
return json
} catch {
throw ParsingError.internalError(error)
}
}
func serialize(json: JSON) throws -> String {
do {
let data = try JSONSerialization.data(withJSONObject: json, options: [])
return String(data: data, encoding: .utf8)!
} catch {
throw ParsingError.internalError(error)
}
}```swift
typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
// JSON parser, returns custom error type in case of failures.
func parse(string: String) throws -> JSON {
do {
let data = string.data(using: .utf8)!
let json = try JSONSerialization.jsonObject(with: data, options: []) as! JSON
return json
} catch {
throw ParsingError.internalError(error)
}
}
// JSON serializer, returns custom error type in case of failures.
func serialize(json: JSON) throws -> String {
do {
let data = try JSONSerialization.data(withJSONObject: json, options: [])
return String(data: data, encoding: .utf8)!
} catch {
throw ParsingError.internalError(error)
}
}
```typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
func parse(string: String) throws -> JSON {
do {
let data = string.data(using: .utf8)!
let json = try JSONSerialization.jsonObject(with: data, options: []) as! JSON
return json
} catch {
throw ParsingError.internalError(error)
}
}
func parse(data: Data) throws -> JSON {
do {
let json = try JSONSerialization.jsonObject(with: data, options: []) as! JSON
return json
} catch {
throw ParsingError.internalError(error)
}
}
func parse(file: String) throws -> JSON {
do {
let data = try Data(contentsOf: URL(fileURLWithPath: file))
let json = try JSONSerialization.jsonObject(with: data, options: []) as! JSON
return json
} catch {
throw ParsingError.internalError(error)
}
}```swift
typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
// JSON parser, returns custom error type in case of failures.
func parse(string: String) throws -> JSON {
do {
let data = string.data(using: .utf8)!
let json = try JSONSerialization.jsonObject(with: data, options: []) as! JSON
return json
} catch {
throw ParsingError.internalError(error)
}
}
// JSON parser, returns custom error type in case of failures.
func parse(data: Data) throws -> JSON {
do {
let json = try JSONSerialization.jsonObject(with: data, options: []) as! JSON
return json
} catch {
throw ParsingError.internalError(error)
}
}
// JSON parser, returns custom error type in case of failures.
func parse(file: String) throws -> JSON {
do {
let data = try Data(contentsOf: URL(fileURLWithPath: file))
let json = try JSONSerialization.jsonObject(with: data, options: []) as! JSON
return json
} catch {
throw ParsingError.internalError(error)
}
}
```typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
func parse(string: String) throws -> JSON {
do {
let data = string.data(using: .utf8)!
let json = try JSONSerialization.jsonObject(with: data, options: []) as! JSON
return json
} catch {
throw ParsingError.internalError(error)
}
}
func serialize(json: JSON) throws -> String {
do {
let data = try JSONSerialization.data(withJSONObject: json, options: [])
return String(data: data, encoding: .utf8)!
} catch {
throw ParsingError.internalError(error)
}
}```swift
typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
// JSON parser, returns custom error type in case of failures.
func parse(string: String) throws -> JSON {
do {
let data = string.data(using: .utf8)!
let json = try JSONSerialization.jsonObject(with: data, options: []) as! JSON
return json
} catch {
throw ParsingError.internalError(error)
}
}
// JSON serializer, returns custom error type in case of failures.
func serialize(json: JSON) throws -> String {
do {
let data = try JSONSerialization.data(withJSONObject: json, options: [])
return String(data: data, encoding: .utf8)!
} catch {
throw ParsingError.internalError(error)
}
}
// Example usage
do {
let json = try parse(string: "{\"key\": \"value\"}")
print(json)
let string = try serialize(json: json)
print(string)
} catch ParsingError.invalidInput {
print("Invalid input")
} catch ParsingError.internalError(let error) {
print("Internal error: \(error)")
}
```typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
func parse(string: String) throws -> JSON {
do {
let data = string.data(using: .utf8)!
let json = try JSONSerialization.jsonObject(with: data, options: []) as! JSON
return json
} catch {
throw ParsingError.internalError(error)
}
}
func serialize(json: JSON) throws -> String {
do {
let data = try JSONSerialization.data(withJSONObject: json, options: [])
return String(data: data, encoding: .utf8)!
} catch {
throw ParsingError.internalError(error)
}
}```swift
typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
// JSON parser, returns custom error type in case of failures.
func parse(string: String) throws -> JSON {
do {
let data = string.data(using: .utf8)!
let json = try JSONSerialization.jsonObject(with: data, options: []) as! JSON
return json
} catch {
throw ParsingError.internalError(error)
}
}
// JSON serializer, returns custom error type in case of failures.
func serialize(json: JSON) throws -> String {
do {
let data = try JSONSerialization.data(withJSONObject: json, options: [])
return String(data: data, encoding: .utf8)!
} catch {
throw ParsingError.internalError(error)
}
}
// Example usage
do {
let json = try parse(string: "{\"name\": \"John\"}")
print(json)
let string = try serialize(json: json)
print(string)
} catch {
print(error)
}
```typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
func parse(string: String) throws -> JSON {
do {
let data = string.data(using: .utf8)!
let json = try JSONSerialization.jsonObject(with: data, options: []) as! JSON
return json
} catch {
throw ParsingError.internalError(error)
}
}
func serialize(json: JSON) throws -> String {
do {
let data = try JSONSerialization.data(withJSONObject: json, options: [])
return String(data: data, encoding: .utf8)!
} catch {
throw ParsingError.internalError(error)
}
}```swift
typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
// JSON parser, returns custom error type in case of failures.
func parse(string: String) throws -> JSON {
do {
let data = string.data(using: .utf8)!
let json = try JSONSerialization.jsonObject(with: data, options: []) as! JSON
return json
} catch {
throw ParsingError.internalError(error)
}
}
// JSON serializer, returns custom error type in case of failures.
func serialize(json: JSON) throws -> String {
do {
let data = try JSONSerialization.data(withJSONObject: json, options: [])
return String(data: data, encoding: .utf8)!
} catch {
throw ParsingError.internalError(error)
}
}
// Example usage
let json = ["name": "John", "age": 30]
let jsonString = try serialize(json: json)
print(jsonString) // {"name":"John","age":30}
let parsedJson = try parse(string: jsonString)
print(parsedJson) // ["name": "John", "age": 30]
```typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
func parse(string: String) throws -> JSON {
do {
return try JSONSerialization.jsonObject(with: string.data(using: .utf8)!, options: []) as! JSON
} catch {
throw ParsingError.internalError(error)
}
}
func parse(data: Data) throws -> JSON {
do {
return try JSONSerialization.jsonObject(with: data, options: []) as! JSON
} catch {
throw ParsingError.internalError(error)
}
}
func parse(url: URL) throws -> JSON {
do {
return try JSONSerialization.jsonObject(with: try Data(contentsOf: url), options: []) as! JSON
} catch {
throw ParsingError.internalError(error)
}
}
func parse(file: String) throws -> JSON {
do {
return try JSONSerialization.jsonObject(with: try Data(contentsOf: URL(fileURLWithPath: file)), options: []) as! JSON
} catch {
throw ParsingError.internalError(error)
}
}```swift
typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
// JSON parser, returns custom error type in case of failures.
func parse(string: String) throws -> JSON {
do {
return try JSONSerialization.jsonObject(with: string.data(using: .utf8)!, options: []) as! JSON
} catch {
throw ParsingError.internalError(error)
}
}
// JSON parser, returns custom error type in case of failures.
func parse(data: Data) throws -> JSON {
do {
return try JSONSerialization.jsonObject(with: data, options: []) as! JSON
} catch {
throw ParsingError.internalError(error)
}
}
// JSON parser, returns custom error type in case of failures.
func parse(url: URL) throws -> JSON {
do {
return try JSONSerialization.jsonObject(with: try Data(contentsOf: url), options: []) as! JSON
} catch {
throw ParsingError.internalError(error)
}
}
// JSON parser, returns custom error type in case of failures.
func parse(file: String) throws -> JSON {
do {
return try JSONSerialization.jsonObject(with: try Data(contentsOf: URL(fileURLWithPath: file)), options: []) as! JSON
} catch {
throw ParsingError.internalError(error)
}
}
```indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
return "<\(name)\(attributes.map { " \(key)=\"\(value)\"" }.joined())>\(children.map(generate).joined())</\(name)>"
}
}```swift
indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
return "<\(name)\(attributes.map { " \(key)=\"\(value)\"" }.joined())>\(children.map(generate).joined())</\(name)>"
}
}
// Example usage
let tree = HTMLNode.element("div", children: [
.element("a", attributes: ["href": "swifteval"], children: [
.text("SwiftEval")
])
])
print(generate(tree))
```return "<\(name)\(attributes.map { " \(key)=\"\(value)\"" }.joined())>\(children.map(generate).joined())</\(name)>" // contextual type for closure argument list expects 1 argument, which cannot be implicitly ignoredreturn "<\(name)\(attributes.map { " \(key)=\"\(value)\"" }.joined())>\(children.map(generate).joined())</\(name)>" // cannot find 'value' in scopereturn "<\(name)\(attributes.map { " \(key)=\"\(value)\"" }.joined())>\(children.map(generate).joined())</\(name)>" // cannot find 'key' in scopeindirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
return "<\(name)\(attributes.map { " \(key)=\"\($0.value)\"" }.joined())>\(children.map(generate).joined())</\(name)>"
}
}
func parse(_ html: String) -> HTMLNode {
var stack = [HTMLNode]()
var current: HTMLNode?
for char in html {
switch char {
case "<":
current = .element(name: String(stack.popLast()!))
case ">":
stack.append(current!)
current = nil
case " ":
if let current = current {
switch current {
case .element(let name, let attributes, let children):
stack.append(.element(name: name, attributes: attributes, children: children))
default:
break
}
}
default:
if let current = current {
switch current {
case .element(let name, let attributes, let children):
stack.append(.element(name: name, attributes: attributes, children: children))
case .text(let content):
stack.append(.text(content + String(char)))
}
} else {
stack.append(.text(String(char)))
}
}
}
return stack.first!
}```swift
indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
return "<\(name)\(attributes.map { " \(key)=\"\($0.value)\"" }.joined())>\(children.map(generate).joined())</\(name)>"
}
}
// HTML parser to predefined elements tree.
// Input with standart HTML like this "<div><a href="swifteval"></a></div>"
func parse(_ html: String) -> HTMLNode {
var stack = [HTMLNode]()
var current: HTMLNode?
for char in html {
switch char {
case "<":
current = .element(name: String(stack.popLast()!))
case ">":
stack.append(current!)
current = nil
case " ":
if let current = current {
switch current {
case .element(let name, let attributes, let children):
stack.append(.element(name: name, attributes: attributes, children: children))
default:
break
}
}
default:
if let current = current {
switch current {
case .element(let name, let attributes, let children):
stack.append(.element(name: name, attributes: attributes, children: children))
case .text(let content):
stack.append(.text(content + String(char)))
}
} else {
stack.append(.text(String(char)))
}
}
}
return stack.first!
}
// Example usage
let html = "<div><a href=\"swifteval\"></a></div>"
let tree = parse(html)
let result = generate(tree)
print(result) // "<div><a href="swifteval"></a></div>"
```return "<\(name)\(attributes.map { " \(key)=\"\($0.value)\"" }.joined())>\(children.map(generate).joined())</\(name)>" // cannot find 'key' in scopecurrent = .element(name: String(stack.popLast()!)) // extraneous argument label 'name:' in callcurrent = .element(name: String(stack.popLast()!)) // no exact matches in call to initializerstack.append(.element(name: name, attributes: attributes, children: children)) // extraneous argument label 'name:' in callstack.append(.element(name: name, attributes: attributes, children: children)) // extraneous argument label 'name:' in callindirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
return "<\(name)\(attributes.map { " \(key)=\"\($0.value)\"" }.joined())>\(children.map(generate).joined())</\(name)>"
}
}```swift
indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
return "<\(name)\(attributes.map { " \(key)=\"\($0.value)\"" }.joined())>\(children.map(generate).joined())</\(name)>"
}
}
// Example of usage
let tree = HTMLNode.element("div", children: [
.element("a", attributes: ["href": "swifteval"], children: [
.text("SwiftEval")
])
])
print(generate(tree))
```return "<\(name)\(attributes.map { " \(key)=\"\($0.value)\"" }.joined())>\(children.map(generate).joined())</\(name)>" // cannot find 'key' in scopeindirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
var result = "<\(name)"
for (key, value) in attributes {
result += " \(key)=\"\(value)\""
}
result += ">"
for child in children {
result += generate(child)
}
result += "</\(name)>"
return result
}
}```swift
indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
var result = "<\(name)"
for (key, value) in attributes {
result += " \(key)=\"\(value)\""
}
result += ">"
for child in children {
result += generate(child)
}
result += "</\(name)>"
return result
}
}
// Example of usage
let tree = HTMLNode.element("div", attributes: ["class": "container"], children: [
.element("a", attributes: ["href": "swifteval"], children: [
.text("SwiftEval")
])
])
print(generate(tree))
```indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
var result = "<\(name)"
for (key, value) in attributes {
result += " \(key)=\"\(value)\""
}
result += ">"
for child in children {
result += generate(child)
}
result += "</\(name)>"
return result
}
}```swift
indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
var result = "<\(name)"
for (key, value) in attributes {
result += " \(key)=\"\(value)\""
}
result += ">"
for child in children {
result += generate(child)
}
result += "</\(name)>"
return result
}
}
let tree = HTMLNode.element("div", children: [
.element("a", attributes: ["href": "swifteval"]),
])
print(generate(tree))
```indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
var result = "<\(name)"
for (key, value) in attributes {
result += " \(key)=\"\(value)\""
}
result += ">"
for child in children {
result += generate(child)
}
result += "</\(name)>"
return result
}
}```swift
indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
var result = "<\(name)"
for (key, value) in attributes {
result += " \(key)=\"\(value)\""
}
result += ">"
for child in children {
result += generate(child)
}
result += "</\(name)>"
return result
}
}
// Example of usage
let tree = HTMLNode.element("div", attributes: ["class": "my-class"], children: [
.element("a", attributes: ["href": "swifteval"], children: [
.text("SwiftEval")
])
])
print(generate(tree))
```indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
func generate(_ tree: HTMLNode) -> String {
switch tree {
case let .text(content):
return content
case let .element(name, attributes, children):
var result = "<\(name)"
for (key, value) in attributes {
result += " \(key)=\"\(value)\""
}
result += ">"
for child in children {
result += generate(child)
}
result += "</\(name)>"
return result
}
}```swift
indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case let .text(content):
return content
case let .element(name, attributes, children):
var result = "<\(name)"
for (key, value) in attributes {
result += " \(key)=\"\(value)\""
}
result += ">"
for child in children {
result += generate(child)
}
result += "</\(name)>"
return result
}
}
// Example usage
let tree = HTMLNode.element("div", attributes: ["class": "container"], children: [
.element("a", attributes: ["href": "swifteval"], children: [
.text("SwiftEval")
])
])
print(generate(tree))
```indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
var result = "<\(name)"
for (key, value) in attributes {
result += " \(key)=\"\(value)\""
}
result += ">"
for child in children {
result += generate(child)
}
result += "</\(name)>"
return result
}
}```swift
indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
var result = "<\(name)"
for (key, value) in attributes {
result += " \(key)=\"\(value)\""
}
result += ">"
for child in children {
result += generate(child)
}
result += "</\(name)>"
return result
}
}
// Example usage
let tree = HTMLNode.element("div", attributes: ["class": "container"], children: [
.element("a", attributes: ["href": "swifteval"], children: [
.text("SwiftEval")
])
])
print(generate(tree))
```indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
return "<\(name)\(attributes.map { " \($0)=\"\($1)\"" }.joined())>\(children.map(generate).joined())</\(name)>"
}
}```swift
indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
return "<\(name)\(attributes.map { " \($0)=\"\($1)\"" }.joined())>\(children.map(generate).joined())</\(name)>"
}
}
// Example of usage
let tree = HTMLNode.element("div", attributes: ["class": "container"], children: [
.element("a", attributes: ["href": "swifteval"], children: [
.text("SwiftEval")
])
])
print(generate(tree))
```indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
var result = "<\(name)"
for (key, value) in attributes {
result += " \(key)=\"\(value)\""
}
result += ">"
for child in children {
result += generate(child)
}
result += "</\(name)>"
return result
}
}```swift
indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
var result = "<\(name)"
for (key, value) in attributes {
result += " \(key)=\"\(value)\""
}
result += ">"
for child in children {
result += generate(child)
}
result += "</\(name)>"
return result
}
}
// Example of usage
let tree = HTMLNode.element("div", attributes: ["class": "container"], children: [
.element("a", attributes: ["href": "swifteval"], children: [
.text("SwiftEval")
])
])
print(generate(tree))
```enum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
var tokens = [Token]()
var index = 0
while index < string.count {
let char = string[string.index(string.startIndex, offsetBy: index)]
switch char {
case " ":
index += 1
case "+", "-", "*", "/":
tokens.append(Token(kind: .operator(char), value: nil))
index += 1
case "(":
tokens.append(Token(kind: .leftParenthesis, value: nil))
index += 1
case ")":
tokens.append(Token(kind: .rightParenthesis, value: nil))
index += 1
default:
if let value = Double(String(char)) {
tokens.append(Token(kind: .value(value), value: value))
index += 1
} else {
throw CalculateError.invalidInput
}
}
}
return try calculate(tokens)
}
func calculate(_ tokens: [Token]) throws -> Double {
var stack = [Double]()
for token in tokens {
switch token.kind {
case .value(let value):
stack.append(value)
case .operator(let op):
if stack.count < 2 {
throw CalculateError.invalidInput
}
let right = stack.removeLast()
let left = stack.removeLast()
switch op {
case "+":
stack.append(left + right)
case "-":
stack.append(left - right)
case "*":
stack.append(left * right)
case "/":
stack.append(left / right)
default:
throw CalculateError.invalidInput
}
case .leftParenthesis:
stack.append(try calculate(tokens[tokens.index(after: tokens.startIndex)...]))
case .rightParenthesis:
throw CalculateError.invalidInput
}
}
if stack.count != 1 {
throw CalculateError.invalidInput
}
return stack.removeLast()
}```swift
enum CalculateError: Error {
case invalidInput
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
var tokens = [Token]()
var index = 0
while index < string.count {
let char = string[string.index(string.startIndex, offsetBy: index)]
switch char {
case " ":
index += 1
case "+", "-", "*", "/":
tokens.append(Token(kind: .operator(char), value: nil))
index += 1
case "(":
tokens.append(Token(kind: .leftParenthesis, value: nil))
index += 1
case ")":
tokens.append(Token(kind: .rightParenthesis, value: nil))
index += 1
default:
if let value = Double(String(char)) {
tokens.append(Token(kind: .value(value), value: value))
index += 1
} else {
throw CalculateError.invalidInput
}
}
}
return try calculate(tokens)
}
func calculate(_ tokens: [Token]) throws -> Double {
var stack = [Double]()
for token in tokens {
switch token.kind {
case .value(let value):
stack.append(value)
case .operator(let op):
if stack.count < 2 {
throw CalculateError.invalidInput
}
let right = stack.removeLast()
let left = stack.removeLast()
switch op {
case "+":
stack.append(left + right)
case "-":
stack.append(left - right)
case "*":
stack.append(left * right)
case "/":
stack.append(left / right)
default:
throw CalculateError.invalidInput
}
case .leftParenthesis:
stack.append(try calculate(tokens[tokens.index(after: tokens.startIndex)...]))
case .rightParenthesis:
throw CalculateError.invalidInput
}
}
if stack.count != 1 {
throw CalculateError.invalidInput
}
return stack.removeLast()
}
let result = try calculate("2+2*2")
print(result) // 6.0
```var tokens = [Token]() // cannot find 'Token' in scopevar tokens = [Token]() // cannot call value of non-function type '[Any]'tokens.append(Token(kind: .operator(char), value: nil)) // 'nil' requires a contextual typetokens.append(Token(kind: .operator(char), value: nil)) // cannot find 'Token' in scopetokens.append(Token(kind: .operator(char), value: nil)) // cannot infer contextual base in reference to member 'operator'tokens.append(Token(kind: .leftParenthesis, value: nil)) // 'nil' requires a contextual typetokens.append(Token(kind: .leftParenthesis, value: nil)) // cannot infer contextual base in reference to member 'leftParenthesis'tokens.append(Token(kind: .leftParenthesis, value: nil)) // cannot find 'Token' in scopetokens.append(Token(kind: .rightParenthesis, value: nil)) // cannot infer contextual base in reference to member 'rightParenthesis'tokens.append(Token(kind: .rightParenthesis, value: nil)) // cannot find 'Token' in scopetokens.append(Token(kind: .rightParenthesis, value: nil)) // 'nil' requires a contextual typetokens.append(Token(kind: .value(value), value: value)) // cannot find 'Token' in scopetokens.append(Token(kind: .value(value), value: value)) // cannot infer contextual base in reference to member 'value'func calculate(_ tokens: [Token]) throws -> Double { // cannot find type 'Token' in scopeenum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
var tokens = [Token]()
var index = 0
while index < string.count {
let char = string[string.index(string.startIndex, offsetBy: index)]
switch char {
case " ":
index += 1
case "+", "-", "*", "/", "(":
tokens.append(Token(type: .operator(char), value: nil))
index += 1
case ")":
tokens.append(Token(type: .closeParenthesis, value: nil))
index += 1
default:
if let value = Double(string[string.index(string.startIndex, offsetBy: index)...]) {
tokens.append(Token(type: .value(value), value: value))
index += string.count - index
} else {
throw CalculateError.invalidInput
}
}
}
return try calculate(tokens)
}
func calculate(_ tokens: [Token]) throws -> Double {
var stack = [Double]()
for token in tokens {
switch token.type {
case .value(let value):
stack.append(value)
case .operator(let op):
switch op {
case "+":
stack.append(stack.removeLast() + stack.removeLast())
case "-":
let b = stack.removeLast()
stack.append(stack.removeLast() - b)
case "*":
stack.append(stack.removeLast() * stack.removeLast())
case "/":
let b = stack.removeLast()
stack.append(stack.removeLast() / b)
default:
throw CalculateError.invalidInput
}
case .openParenthesis:
break
case .closeParenthesis:
break
}
}
return stack.removeLast()
}```swift
enum CalculateError: Error {
case invalidInput
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
var tokens = [Token]()
var index = 0
while index < string.count {
let char = string[string.index(string.startIndex, offsetBy: index)]
switch char {
case " ":
index += 1
case "+", "-", "*", "/", "(":
tokens.append(Token(type: .operator(char), value: nil))
index += 1
case ")":
tokens.append(Token(type: .closeParenthesis, value: nil))
index += 1
default:
if let value = Double(string[string.index(string.startIndex, offsetBy: index)...]) {
tokens.append(Token(type: .value(value), value: value))
index += string.count - index
} else {
throw CalculateError.invalidInput
}
}
}
return try calculate(tokens)
}
func calculate(_ tokens: [Token]) throws -> Double {
var stack = [Double]()
for token in tokens {
switch token.type {
case .value(let value):
stack.append(value)
case .operator(let op):
switch op {
case "+":
stack.append(stack.removeLast() + stack.removeLast())
case "-":
let b = stack.removeLast()
stack.append(stack.removeLast() - b)
case "*":
stack.append(stack.removeLast() * stack.removeLast())
case "/":
let b = stack.removeLast()
stack.append(stack.removeLast() / b)
default:
throw CalculateError.invalidInput
}
case .openParenthesis:
break
case .closeParenthesis:
break
}
}
return stack.removeLast()
}
// Test cases
assert(try calculate("2+2*2") == 6)
assert(try calculate("2+2*2-1") == 5)
assert(try calculate("2+2*2-1+1") == 6)
assert(try calculate("2+2*2-1+1*1") == 7)
assert(try calculate("2+2*2-1+1*1-1") == 6)
assert(try calculate("2+2*2-1+1*1-1+1") == 7)
assert(try calculate("2+2*2-1+1*1-1+1*1") == 8)
assert(try calculate("2+2*2-1+1*1-1+1*1-1") == 7)
assert(try calculate("2+2*2-1+1*1-1+1*1-1+1") == 8)
assert(try calculate("2+2*2-1+1*1-1+1*1-1+1*1") == 9)
assert(try calculate("2+2*2-1+1*1-1+1*1-1+1*1-1") == 8)
assert(try calculate("2+2*2-1+1*1-1+1*1-1+1*1-1+1") == 9)
assert(try calculate("2+2*2-1+1*1-1+1*1-1+1*1-1+1*1") == 10)
assert(try calculate("2+2*2-1+1*1-1+1*1-1+1*1-1+1*1-1") == 9)
assert(try calculate("2+2*2-1+1*1-1+1*1-1+1*1-1+1*1-1+1") == 10)
assert(try calculate("2+2*2-1+1*1-1+1*1-1+1*1-1+1*1-1+1*1") == 11)
assert(try calculate("2+2*2-1+1*1-1+1*1-1+1*1-1+1*1-1+1*1-1") == 10)
assert(try calculate("2+2*2-1+1*1-1var tokens = [Token]() // cannot find 'Token' in scopevar tokens = [Token]() // cannot call value of non-function type '[Any]'tokens.append(Token(type: .operator(char), value: nil)) // cannot find 'Token' in scopetokens.append(Token(type: .operator(char), value: nil)) // 'nil' requires a contextual typetokens.append(Token(type: .operator(char), value: nil)) // cannot infer contextual base in reference to member 'operator'tokens.append(Token(type: .closeParenthesis, value: nil)) // 'nil' requires a contextual typetokens.append(Token(type: .closeParenthesis, value: nil)) // cannot find 'Token' in scopetokens.append(Token(type: .closeParenthesis, value: nil)) // cannot infer contextual base in reference to member 'closeParenthesis'tokens.append(Token(type: .value(value), value: value)) // cannot infer contextual base in reference to member 'value'tokens.append(Token(type: .value(value), value: value)) // cannot find 'Token' in scopefunc calculate(_ tokens: [Token]) throws -> Double { // cannot find type 'Token' in scopeenum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
var tokens = [Token]()
var index = 0
while index < string.count {
let char = string[index]
switch char {
case " ":
index += 1
case "+", "-", "*", "/", "(":
tokens.append(Token(char))
index += 1
case ")":
while let token = tokens.last, token.type != .leftParenthesis {
tokens.removeLast()
}
tokens.removeLast()
index += 1
default:
guard let number = Double(String(char)) else {
throw CalculateError.invalidInput
}
tokens.append(Token(number))
index += 1
}
}
return try evaluate(tokens)
}
func evaluate(_ tokens: [Token]) throws -> Double {
var stack = [Double]()
for token in tokens {
switch token.type {
case .number:
stack.append(token.value)
case .addition:
guard let right = stack.popLast(), let left = stack.popLast() else {
throw CalculateError.invalidInput
}
stack.append(left + right)
case .subtraction:
guard let right = stack.popLast(), let left = stack.popLast() else {
throw CalculateError.invalidInput
}
stack.append(left - right)
case .multiplication:
guard let right = stack.popLast(), let left = stack.popLast() else {
throw CalculateError.invalidInput
}
stack.append(left * right)
case .division:
guard let right = stack.popLast(), let left = stack.popLast() else {
throw CalculateError.invalidInput
}
stack.append(left / right)
case .leftParenthesis:
stack.append(try evaluate(tokens[tokens.count - 1..<tokens.count]))
default:
break
}
}
guard let result = stack.popLast() else {
throw CalculateError.invalidInput
}
return result
}
struct Token {
let type: TokenType
let value: Double
}
enum TokenType: Character {
case number = "0"
case addition = "+"
case subtraction = "-"
case multiplication = "*"
case division = "/"
case leftParenthesis = "("
case rightParenthesis = ")"
}```swift
enum CalculateError: Error {
case invalidInput
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
var tokens = [Token]()
var index = 0
while index < string.count {
let char = string[index]
switch char {
case " ":
index += 1
case "+", "-", "*", "/", "(":
tokens.append(Token(char))
index += 1
case ")":
while let token = tokens.last, token.type != .leftParenthesis {
tokens.removeLast()
}
tokens.removeLast()
index += 1
default:
guard let number = Double(String(char)) else {
throw CalculateError.invalidInput
}
tokens.append(Token(number))
index += 1
}
}
return try evaluate(tokens)
}
func evaluate(_ tokens: [Token]) throws -> Double {
var stack = [Double]()
for token in tokens {
switch token.type {
case .number:
stack.append(token.value)
case .addition:
guard let right = stack.popLast(), let left = stack.popLast() else {
throw CalculateError.invalidInput
}
stack.append(left + right)
case .subtraction:
guard let right = stack.popLast(), let left = stack.popLast() else {
throw CalculateError.invalidInput
}
stack.append(left - right)
case .multiplication:
guard let right = stack.popLast(), let left = stack.popLast() else {
throw CalculateError.invalidInput
}
stack.append(left * right)
case .division:
guard let right = stack.popLast(), let left = stack.popLast() else {
throw CalculateError.invalidInput
}
stack.append(left / right)
case .leftParenthesis:
stack.append(try evaluate(tokens[tokens.count - 1..<tokens.count]))
default:
break
}
}
guard let result = stack.popLast() else {
throw CalculateError.invalidInput
}
return result
}
// Token is a struct which contains a token type and a value.
struct Token {
let type: TokenType
let value: Double
}
// TokenType is an enum which contains all token types.
enum TokenType: Character {
case number = "0"
case addition = "+"
case subtraction = "-"
case multiplication = "*"
case division = "/"
case leftParenthesis = "("
case rightParenthesis = ")"
}
```let char = string[index] // 'subscript(_:)' is unavailable: cannot subscript String with an Int, use a String.Index instead.tokens.append(Token(char)) // missing argument label 'type:' in calltokens.append(Token(char)) // cannot convert value of type 'Character' to expected argument type 'TokenType'tokens.append(Token(char)) // missing argument for parameter 'value' in calltokens.append(Token(number)) // missing argument label 'type:' in calltokens.append(Token(number)) // cannot convert value of type 'Double' to expected argument type 'TokenType'tokens.append(Token(number)) // missing argument for parameter 'value' in callstack.append(try evaluate(tokens[tokens.count - 1..<tokens.count])) // cannot convert value of type 'ArraySlice<Token>' to expected argument type '[Token]'enum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
var stack = [Double]()
var operators = [String]()
var tokenIndex = 0
var token = string[tokenIndex]
while tokenIndex < string.count {
if token.isNumber {
stack.append(Double(token)!)
} else if token == "(" {
operators.append(token)
} else if token == ")" {
while let topOperator = operators.popLast(), topOperator != "(" {
try evaluate(operators, stack)
}
if operators.last == "(" {
operators.removeLast()
}
} else {
while !operators.isEmpty && operators.last!.precedence >= token.precedence {
try evaluate(operators, stack)
}
operators.append(token)
}
tokenIndex += 1
if tokenIndex < string.count {
token = string[tokenIndex]
}
}
while !operators.isEmpty {
try evaluate(operators, stack)
}
guard stack.count == 1 else {
throw CalculateError.invalidInput
}
return stack.removeLast()
}
func evaluate(_ operators: [String], _ stack: inout [Double]) throws {
guard let topOperator = operators.popLast() else {
throw CalculateError.invalidInput
}
guard let rightOperand = stack.popLast() else {
throw CalculateError.invalidInput
}
guard let leftOperand = stack.popLast() else {
throw CalculateError.invalidInput
}
let result: Double
switch topOperator {
case "+":
result = leftOperand + rightOperand
case "-":
result = leftOperand - rightOperand
case "*":
result = leftOperand * rightOperand
case "/":
guard rightOperand != 0 else {
throw CalculateError.invalidInput
}
result = leftOperand / rightOperand
default:
throw CalculateError.invalidInput
}
stack.append(result)
}
extension String {
var isNumber: Bool {
return Double(self) != nil
}
}
extension String {
var precedence: Int {
switch self {
case "+", "-":
return 1
case "*", "/":
return 2
default:
return 0
}
}
}```swift
enum CalculateError: Error {
case invalidInput
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
var stack = [Double]()
var operators = [String]()
var tokenIndex = 0
var token = string[tokenIndex]
while tokenIndex < string.count {
if token.isNumber {
stack.append(Double(token)!)
} else if token == "(" {
operators.append(token)
} else if token == ")" {
while let topOperator = operators.popLast(), topOperator != "(" {
try evaluate(operators, stack)
}
if operators.last == "(" {
operators.removeLast()
}
} else {
while !operators.isEmpty && operators.last!.precedence >= token.precedence {
try evaluate(operators, stack)
}
operators.append(token)
}
tokenIndex += 1
if tokenIndex < string.count {
token = string[tokenIndex]
}
}
while !operators.isEmpty {
try evaluate(operators, stack)
}
guard stack.count == 1 else {
throw CalculateError.invalidInput
}
return stack.removeLast()
}
func evaluate(_ operators: [String], _ stack: inout [Double]) throws {
guard let topOperator = operators.popLast() else {
throw CalculateError.invalidInput
}
guard let rightOperand = stack.popLast() else {
throw CalculateError.invalidInput
}
guard let leftOperand = stack.popLast() else {
throw CalculateError.invalidInput
}
let result: Double
switch topOperator {
case "+":
result = leftOperand + rightOperand
case "-":
result = leftOperand - rightOperand
case "*":
result = leftOperand * rightOperand
case "/":
guard rightOperand != 0 else {
throw CalculateError.invalidInput
}
result = leftOperand / rightOperand
default:
throw CalculateError.invalidInput
}
stack.append(result)
}
extension String {
var isNumber: Bool {
return Double(self) != nil
}
}
extension String {
var precedence: Int {
switch self {
case "+", "-":
return 1
case "*", "/":
return 2
default:
return 0
}
}
}
```var token = string[tokenIndex] // 'subscript(_:)' is unavailable: cannot subscript String with an Int, use a String.Index instead.stack.append(Double(token)!) // cannot convert value of type 'Character' to expected argument type 'Substring'operators.append(token) // cannot convert value of type 'Character' to expected argument type 'String'try evaluate(operators, stack) // passing value of type '[Double]' to an inout parameter requires explicit '&'while !operators.isEmpty && operators.last!.precedence >= token.precedence { // value of type 'Character' has no member 'precedence'try evaluate(operators, stack) // passing value of type '[Double]' to an inout parameter requires explicit '&'operators.append(token) // cannot convert value of type 'Character' to expected argument type 'String'token = string[tokenIndex] // 'subscript(_:)' is unavailable: cannot subscript String with an Int, use a String.Index instead.try evaluate(operators, stack) // passing value of type '[Double]' to an inout parameter requires explicit '&'guard let topOperator = operators.popLast() else { // cannot use mutating member on immutable value: 'operators' is a 'let' constantenum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
var tokens = [Token]()
var index = 0
while index < string.count {
let char = string[index]
if char == " " {
index += 1
continue
}
if char == "+" || char == "-" || char == "*" || char == "/" {
tokens.append(.operator(char))
index += 1
continue
}
if char == "(" {
tokens.append(.leftParenthesis)
index += 1
continue
}
if char == ")" {
tokens.append(.rightParenthesis)
index += 1
continue
}
if char.isNumber {
var number = ""
while index < string.count && string[index].isNumber {
number.append(string[index])
index += 1
}
tokens.append(.number(Double(number)!))
continue
}
throw CalculateError.invalidInput
}
return try evaluate(tokens)
}
func evaluate(_ tokens: [Token]) throws -> Double {
var stack = [Double]()
for token in tokens {
switch token {
case .number(let value):
stack.append(value)
case .operator(let op):
if stack.count < 2 {
throw CalculateError.invalidInput
}
let right = stack.removeLast()
let left = stack.removeLast()
switch op {
case "+":
stack.append(left + right)
case "-":
stack.append(left - right)
case "*":
stack.append(left * right)
case "/":
stack.append(left / right)
default:
throw CalculateError.invalidInput
}
case .leftParenthesis:
stack.append(try evaluate(tokens[tokens.count - 1...]))
case .rightParenthesis:
break
}
}
if stack.count != 1 {
throw CalculateError.invalidInput
}
return stack.removeLast()
}```swift
enum CalculateError: Error {
case invalidInput
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
var tokens = [Token]()
var index = 0
while index < string.count {
let char = string[index]
if char == " " {
index += 1
continue
}
if char == "+" || char == "-" || char == "*" || char == "/" {
tokens.append(.operator(char))
index += 1
continue
}
if char == "(" {
tokens.append(.leftParenthesis)
index += 1
continue
}
if char == ")" {
tokens.append(.rightParenthesis)
index += 1
continue
}
if char.isNumber {
var number = ""
while index < string.count && string[index].isNumber {
number.append(string[index])
index += 1
}
tokens.append(.number(Double(number)!))
continue
}
throw CalculateError.invalidInput
}
return try evaluate(tokens)
}
func evaluate(_ tokens: [Token]) throws -> Double {
var stack = [Double]()
for token in tokens {
switch token {
case .number(let value):
stack.append(value)
case .operator(let op):
if stack.count < 2 {
throw CalculateError.invalidInput
}
let right = stack.removeLast()
let left = stack.removeLast()
switch op {
case "+":
stack.append(left + right)
case "-":
stack.append(left - right)
case "*":
stack.append(left * right)
case "/":
stack.append(left / right)
default:
throw CalculateError.invalidInput
}
case .leftParenthesis:
stack.append(try evaluate(tokens[tokens.count - 1...]))
case .rightParenthesis:
break
}
}
if stack.count != 1 {
throw CalculateError.invalidInput
}
return stack.removeLast()
}
// Tests
assert(try calculate("2+2*2") == 6)
assert(try calculate("2+2*2-1") == 5)
assert(try calculate("2+2*2-1+1") == 6)
assert(try calculate("2+2*2-1+1*1") == 7)
assert(try calculate("2+2*2-1+1*1+1") == 8)
assert(try calculate("2+2*2-1+1*1+1-1") == 7)
assert(try calculate("2+2*2-1+1*1+1-1+1") == 8)
assert(try calculate("2+2*2-1+1*1+1-1+1*1") == 9)
assert(try calculate("2+2*2-1+1*1+1-1+1*1-1") == 8)
assert(try calculate("2+2*2-1+1*1+1-1+1*1-1+1") == 9)
assert(try calculate("2+2*2-1+1*1+1-1+1*1-1+1-1") == 8)
assert(try calculate("2+2*2-1+1*1+1-1+1*1-1+1-1+1") == 9)
assert(try calculate("2+2*2-1+1*1+1-1+1*1-1+1-1+1-1") == 8)
assert(try calculate("2+2*2-1+1*1+1-1+1*1-1+1-1+1-1+1") == 9)
assert(try calculate("2+2*2-1+1*1+1-1+1*1-1+1-1+1-1+1-1") == 8)
assert(try calculate("2+2*2-1+1*1+1-1+1*1-1+1-1+1-1+1-1+1") == 9)
assert(try calculate("var tokens = [Token]() // cannot find 'Token' in scopevar tokens = [Token]() // cannot call value of non-function type '[Any]'let char = string[index] // 'subscript(_:)' is unavailable: cannot subscript String with an Int, use a String.Index instead.tokens.append(.operator(char)) // cannot infer contextual base in reference to member 'operator'tokens.append(.leftParenthesis) // cannot infer contextual base in reference to member 'leftParenthesis'tokens.append(.rightParenthesis) // cannot infer contextual base in reference to member 'rightParenthesis'while index < string.count && string[index].isNumber { // 'subscript(_:)' is unavailable: cannot subscript String with an Int, use a String.Index instead.number.append(string[index]) // 'subscript(_:)' is unavailable: cannot subscript String with an Int, use a String.Index instead.tokens.append(.number(Double(number)!)) // cannot infer contextual base in reference to member 'number'func evaluate(_ tokens: [Token]) throws -> Double { // cannot find type 'Token' in scopeenum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
let tokens = string.components(separatedBy: CharacterSet(charactersIn: "+-*/() ").inverted)
var stack = [Double]()
for token in tokens {
switch token {
case "(":
break
case ")":
stack.popLast()
case "+", "-", "*", "/":
let op1 = stack.popLast()!
let op2 = stack.popLast()!
let result: Double
switch token {
case "+":
result = op1 + op2
case "-":
result = op1 - op2
case "*":
result = op1 * op2
case "/":
result = op1 / op2
default:
throw CalculateError.invalidInput
}
stack.append(result)
default:
if let operand = Double(token) {
stack.append(operand)
} else {
throw CalculateError.invalidInput
}
}
}
guard let result = stack.popLast() else {
throw CalculateError.invalidInput
}
return result
}```swift
enum CalculateError: Error {
case invalidInput
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
let tokens = string.components(separatedBy: CharacterSet(charactersIn: "+-*/() ").inverted)
var stack = [Double]()
for token in tokens {
switch token {
case "(":
break
case ")":
stack.popLast()
case "+", "-", "*", "/":
let op1 = stack.popLast()!
let op2 = stack.popLast()!
let result: Double
switch token {
case "+":
result = op1 + op2
case "-":
result = op1 - op2
case "*":
result = op1 * op2
case "/":
result = op1 / op2
default:
throw CalculateError.invalidInput
}
stack.append(result)
default:
if let operand = Double(token) {
stack.append(operand)
} else {
throw CalculateError.invalidInput
}
}
}
guard let result = stack.popLast() else {
throw CalculateError.invalidInput
}
return result
}
// Tests
assert(try calculate("2+2*2") == 6)
assert(try calculate("(1+(4+5+2)-3)*5") == 14)
```stack.popLast() // result of call to 'popLast()' is unused // Fatal error: Error raised at top level: Solution.CalculateError.invalidInputenum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
let tokens = string.components(separatedBy: CharacterSet.alphanumerics.inverted)
var stack = [Double]()
for token in tokens {
switch token {
case "+", "-", "*", "/":
let op1 = stack.removeLast()
let op2 = stack.removeLast()
switch token {
case "+": stack.append(op1 + op2)
case "-": stack.append(op2 - op1)
case "*": stack.append(op1 * op2)
case "/": stack.append(op2 / op1)
default: throw CalculateError.invalidInput
}
case "(": stack.append(0)
case ")": stack.removeLast()
default:
guard let op = Double(token) else { throw CalculateError.invalidInput }
stack.append(op)
}
}
guard stack.count == 1 else { throw CalculateError.invalidInput }
return stack[0]
}```swift
enum CalculateError: Error {
case invalidInput
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
let tokens = string.components(separatedBy: CharacterSet.alphanumerics.inverted)
var stack = [Double]()
for token in tokens {
switch token {
case "+", "-", "*", "/":
let op1 = stack.removeLast()
let op2 = stack.removeLast()
switch token {
case "+": stack.append(op1 + op2)
case "-": stack.append(op2 - op1)
case "*": stack.append(op1 * op2)
case "/": stack.append(op2 / op1)
default: throw CalculateError.invalidInput
}
case "(": stack.append(0)
case ")": stack.removeLast()
default:
guard let op = Double(token) else { throw CalculateError.invalidInput }
stack.append(op)
}
}
guard stack.count == 1 else { throw CalculateError.invalidInput }
return stack[0]
}
// Tests
assert(try calculate("2+2") == 4)
assert(try calculate("2-2") == 0)
assert(try calculate("2*2") == 4)
assert(try calculate("2/2") == 1)
assert(try calculate("(2+2)*2") == 8)
assert(try calculate("(2+2)/2") == 2)
assert(try calculate("2*(2+2)") == 8)
assert(try calculate("2+2*(2+2)") == 8)
assert(try calculate("2+2*2") == 6)
assert(try calculate("2+2*2-2") == 4)
assert(try calculate("2+2*2-2*2") == 0)
assert(try calculate("2+2*2-2*2+2") == 2)
assert(try calculate("2+2*2-2*2+2*2") == 4)
assert(try calculate("2+2*2-2*2+2*2*2") == 8)
assert(try calculate("2+2*2-2*2+2*2*2*2") == 16)
assert(try calculate("2+2*2-2*2+2*2*2*2*2") == 32)
assert(try calculate("2+2*2-2*2+2*2*2*2*2*2") == 64)
assert(try calculate("2+2*2-2*2+2*2*2*2*2*2*2") == 128)
assert(try calculate("2+2*2-2*2+2*2*2*2*2*2*2*2") == 256)
assert(try calculate("2+2*2-2*2+2*2*2*2*2*2*2*2*2") == 512)
assert(try calculate("2+2*2-2*2+2*2*2*2*2*2*2*2*2*2") == 1024)
assert(try calculate("2+2*2-2*2+2*2*2*2*2*2*2*2*2*2*2") == 2048)
assert(try calculate("2+2*2-2*2+2*2*2*2*2*2*2*2*2*2*2*2") == 4096)
assert(try calculate("2+2*2-2*2+2*2*2*2*2*2*2*2*2*2*2*2*2") == 8192)
assert(try calculate("2+2*2-2*2+2*2*2*2*2*2*2*2*2*2*2*2*2*2") == 16384)
assert(try calculate("2+2*2-2*2+2*2*2*2*2*2*2*2*2*2*2*2*2*2*2") == 32768)
assert(try calculate("2+2*2-2*2+2*2*2*2*2 // Fatal error: Error raised at top level: Solution.CalculateError.invalidInputenum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
let tokens = string.components(separatedBy: CharacterSet(charactersIn: "+-*/() ").inverted)
var stack: [Double] = []
for token in tokens {
guard let value = Double(token) else {
throw CalculateError.invalidInput
}
switch token {
case "+", "-", "*", "/":
let op1 = stack.removeLast()
let op2 = stack.removeLast()
switch token {
case "+":
stack.append(op1 + op2)
case "-":
stack.append(op2 - op1)
case "*":
stack.append(op1 * op2)
case "/":
stack.append(op2 / op1)
default:
break
}
case "(":
stack.append(value)
case ")":
stack.append(stack.removeLast() * value)
default:
break
}
}
guard stack.count == 1 else {
throw CalculateError.invalidInput
}
return stack.removeLast()
}```swift
enum CalculateError: Error {
case invalidInput
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
let tokens = string.components(separatedBy: CharacterSet(charactersIn: "+-*/() ").inverted)
var stack: [Double] = []
for token in tokens {
guard let value = Double(token) else {
throw CalculateError.invalidInput
}
switch token {
case "+", "-", "*", "/":
let op1 = stack.removeLast()
let op2 = stack.removeLast()
switch token {
case "+":
stack.append(op1 + op2)
case "-":
stack.append(op2 - op1)
case "*":
stack.append(op1 * op2)
case "/":
stack.append(op2 / op1)
default:
break
}
case "(":
stack.append(value)
case ")":
stack.append(stack.removeLast() * value)
default:
break
}
}
guard stack.count == 1 else {
throw CalculateError.invalidInput
}
return stack.removeLast()
}
print(try calculate("2+2*2")) // 6.0
print(try calculate("2+2*2-1")) // 5.0
print(try calculate("2+2*2-1+1")) // 6.0
print(try calculate("2+2*2-1+1*1")) // 7.0
print(try calculate("2+2*2-1+1*1-1")) // 6.0
print(try calculate("2+2*2-1+1*1-1+1")) // 7.0
print(try calculate("2+2*2-1+1*1-1+1*1")) // 8.0
print(try calculate("2+2*2-1+1*1-1+1*1-1")) // 7.0
print(try calculate("2+2*2-1+1*1-1+1*1-1+1")) // 8.0
print(try calculate("2+2*2-1+1*1-1+1*1-1+1*1")) // 9.0
print(try calculate("2+2*2-1+1*1-1+1*1-1+1*1-1")) // 8.0
print(try calculate("2+2*2-1+1*1-1+1*1-1+1*1-1+1")) // 9.0
print(try calculate("2+2*2-1+1*1-1+1*1-1+1*1-1+1*1")) // 10.0
print(try calculate("2+2*2-1+1*1-1+1*1-1+1*1-1+1*1-1")) // 9.0
print(try calculate("2+2*2-1+1*1-1+1*1-1+1*1-1+1*1-1+1")) // 10.0
print(try calculate("2+2*2-1+1*1-1+1*1-1+1*1-1+1*1-1+1*1")) // 11.0
print(try calculate("2+2*2-1+1*1-1+1*1-1+1*1-1+1*1-1+1*1-1")) // 10.0
print(try calculate("2+2*2-1+1*1-1+1*1-1+1*1-1+1*1-1+1*1-1+1")) // 11.0
print(try calculate("2+2*2-1+1*1-1+1*1-1+1*1-1+1*1-1+1*1-1+1*1")) // 12.0
print(try calculate("2+2*2-1+1*1-1+1*1-1+1*1-1+1*1-1+1*1-1+1*1-1")) // 11.0
print(try calculate("2+2*2-1+1*1-1+1*1- // Fatal error: Error raised at top level: Solution.CalculateError.invalidInputenum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
var stack = [Double]()
var token = ""
var index = string.startIndex
while index < string.endIndex {
let char = string[index]
if char.isNumber {
token.append(char)
} else if char == "(" {
stack.append(try calculate(token))
token = ""
} else if char == ")" {
let result = try calculate(token)
token = ""
stack.append(result)
} else if char == "+" || char == "-" || char == "*" || char == "/" {
let result = try calculate(token)
token = ""
stack.append(result)
let op = char
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(try perform(op, a, b))
} else {
throw CalculateError.invalidInput
}
index = string.index(after: index)
}
return stack.removeLast()
}
func perform(_ op: Character, _ a: Double, _ b: Double) throws -> Double {
switch op {
case "+": return a + b
case "-": return a - b
case "*": return a * b
case "/": return a / b
default: throw CalculateError.invalidInput
}
}```swift
enum CalculateError: Error {
case invalidInput
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
var stack = [Double]()
var token = ""
var index = string.startIndex
while index < string.endIndex {
let char = string[index]
if char.isNumber {
token.append(char)
} else if char == "(" {
stack.append(try calculate(token))
token = ""
} else if char == ")" {
let result = try calculate(token)
token = ""
stack.append(result)
} else if char == "+" || char == "-" || char == "*" || char == "/" {
let result = try calculate(token)
token = ""
stack.append(result)
let op = char
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(try perform(op, a, b))
} else {
throw CalculateError.invalidInput
}
index = string.index(after: index)
}
return stack.removeLast()
}
func perform(_ op: Character, _ a: Double, _ b: Double) throws -> Double {
switch op {
case "+": return a + b
case "-": return a - b
case "*": return a * b
case "/": return a / b
default: throw CalculateError.invalidInput
}
}
``` // Fatal error: Can't remove last element from an empty collectionenum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
let tokens = string.components(separatedBy: CharacterSet.alphanumerics.inverted)
var stack: [Double] = []
for token in tokens {
switch token {
case "(":
break
case ")":
stack.removeLast()
case "+", "-", "*", "/":
let b = stack.removeLast()
let a = stack.removeLast()
switch token {
case "+":
stack.append(a + b)
case "-":
stack.append(a - b)
case "*":
stack.append(a * b)
case "/":
stack.append(a / b)
default:
break
}
default:
if let operand = Double(token) {
stack.append(operand)
} else {
throw CalculateError.invalidInput
}
}
}
guard stack.count == 1 else {
throw CalculateError.invalidInput
}
return stack.removeLast()
}```swift
enum CalculateError: Error {
case invalidInput
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
let tokens = string.components(separatedBy: CharacterSet.alphanumerics.inverted)
var stack: [Double] = []
for token in tokens {
switch token {
case "(":
break
case ")":
stack.removeLast()
case "+", "-", "*", "/":
let b = stack.removeLast()
let a = stack.removeLast()
switch token {
case "+":
stack.append(a + b)
case "-":
stack.append(a - b)
case "*":
stack.append(a * b)
case "/":
stack.append(a / b)
default:
break
}
default:
if let operand = Double(token) {
stack.append(operand)
} else {
throw CalculateError.invalidInput
}
}
}
guard stack.count == 1 else {
throw CalculateError.invalidInput
}
return stack.removeLast()
}
// Tests
assert(try calculate("2+2*2") == 6)
assert(try calculate("2+2*2-1") == 5)
assert(try calculate("2+2*2-1+1") == 6)
assert(try calculate("2+2*2-1+1*1") == 7)
assert(try calculate("2+2*2-1+1*1+1") == 8)
assert(try calculate("2+2*2-1+1*1+1-1") == 7)
assert(try calculate("2+2*2-1+1*1+1-1+1") == 8)
assert(try calculate("2+2*2-1+1*1+1-1+1*1") == 9)
assert(try calculate("2+2*2-1+1*1+1-1+1*1-1") == 8)
assert(try calculate("2+2*2-1+1*1+1-1+1*1-1+1") == 9)
assert(try calculate("2+2*2-1+1*1+1-1+1*1-1+1-1") == 8)
assert(try calculate("2+2*2-1+1*1+1-1+1*1-1+1-1+1") == 9)
assert(try calculate("2+2*2-1+1*1+1-1+1*1-1+1-1+1-1") == 8)
assert(try calculate("2+2*2-1+1*1+1-1+1*1-1+1-1+1-1+1") == 9)
assert(try calculate("2+2*2-1+1*1+1-1+1*1-1+1-1+1-1+1-1") == 8)
assert(try calculate("2+2*2-1+1*1+1-1+1*1-1+1-1+1-1+1-1+1") == 9)
assert(try calculate("2+2*2-1+1*1+1-1+1*1-1+1-1+1-1+1-1+1-1") == 8)
assert(try calculate("2+2*2-1+1*1+1-1+1*1-1+1-1+1-1+1-1+1-1+1") == 9)
assert(try calculate("2+2*2-1+1*1+1-1+1*1-1+1-1+1-1+1-1+1-1+1-1") == 8)
assert(try calculate("2+2*2-1+1*1+1-1+1*1-1+1-1+1-1+1-1+1-1+1-1+1") == 9)
assert(try calculate("2+2*2-1+1*1+1-1+1*1-1+1-1+1-1+1-1+1-1+1-1+1-1") == 8)
assert(try calculate("2 // Fatal error: Error raised at top level: Solution.CalculateError.invalidInputfunc execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let stdoutPipe = Pipe()
let stderrPipe = Pipe()
task.standardOutput = stdoutPipe
task.standardError = stderrPipe
task.launch()
let stdoutData = stdoutPipe.fileHandleForReading.readDataToEndOfFile()
let stderrData = stderrPipe.fileHandleForReading.readDataToEndOfFile()
task.waitUntilExit()
return (String(data: stdoutData, encoding: .utf8)!,
String(data: stderrData, encoding: .utf8)!)
}```swift
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let stdoutPipe = Pipe()
let stderrPipe = Pipe()
task.standardOutput = stdoutPipe
task.standardError = stderrPipe
task.launch()
let stdoutData = stdoutPipe.fileHandleForReading.readDataToEndOfFile()
let stderrData = stderrPipe.fileHandleForReading.readDataToEndOfFile()
task.waitUntilExit()
return (String(data: stdoutData, encoding: .utf8)!,
String(data: stderrData, encoding: .utf8)!)
}
// Example usage:
let (stdout, stderr) = execute(binary: "/usr/bin/env", arguments: ["echo", "Hello, world!"])
print(stdout) // Outputs "Hello, world!"
print(stderr) // Outputs ""
```func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8)
return (output ?? "", "")
}```swift
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8)
return (output ?? "", "")
}
``` // XCTAssertTrue failedfunc execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8)
return (output ?? "", "")
}```swift
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8)
return (output ?? "", "")
}
``` // XCTAssertTrue failedfunc execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8)
return (output ?? "", "")
}```swift
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8)
return (output ?? "", "")
}
``` // XCTAssertTrue failedfunc execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8)
return (output ?? "", "")
}```swift
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8)
return (output ?? "", "")
}
``` // XCTAssertTrue failedfunc execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8)
return (output ?? "", "")
}```swift
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8)
return (output ?? "", "")
}
``` // XCTAssertTrue failedfunc execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8)
return (output ?? "", "")
}```swift
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8)
return (output ?? "", "")
}
``` // XCTAssertTrue failedfunc execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8)
return (output ?? "", "")
}
func execute(binary: String, arguments: [String]) -> Int32 {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.launch()
task.waitUntilExit()
return task.terminationStatus
}```swift
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8)
return (output ?? "", "")
}
// Function to execute binary with arguments and return exit code.
func execute(binary: String, arguments: [String]) -> Int32 {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.launch()
task.waitUntilExit()
return task.terminationStatus
}
``` // XCTAssertTrue failedfunc execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8)
return (output ?? "", "")
}```swift
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8)
return (output ?? "", "")
}
``` // XCTAssertTrue failedfunc execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8)
return (output ?? "", "")
}```swift
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.standardError = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: .utf8)
return (output ?? "", "")
}
``` // XCTAssertTrue failedfunc memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { (arg: T) -> U in
if let result = cache[arg] {
return result
}
let result = function(arg)
cache[arg] = result
return result
}
}```swift
// Memoization function that caches the results of expensive computations.
func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { (arg: T) -> U in
if let result = cache[arg] {
return result
}
let result = function(arg)
cache[arg] = result
return result
}
}
// Example usage:
let expensiveFunction = memoize { (n: Int) -> Int in
print("Calculating \(n) ...")
return n * n
}
let result1 = expensiveFunction(2)
let result2 = expensiveFunction(2)
let result3 = expensiveFunction(3)
print(result1) // Calculating 2 ...
print(result2) // 4
print(result3) // Calculating 3 ...
print(result3) // 9
```func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { (arg: T) -> U in
if let result = cache[arg] {
return result
}
let result = function(arg)
cache[arg] = result
return result
}
}```swift
// Memoization function that caches the results of expensive computations.
func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { (arg: T) -> U in
if let result = cache[arg] {
return result
}
let result = function(arg)
cache[arg] = result
return result
}
}
// Memoized function
let expensiveFunction = memoize { (arg: Int) -> Int in
print("Computing...")
return arg * 2
}
// Memoized function call
let result1 = expensiveFunction(2)
print(result1)
// Prints "Computing..."
// Prints "4"
let result2 = expensiveFunction(2)
print(result2)
// Prints "4"
// (result2 is the same as result1)
```func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { (arg: T) -> U in
if let result = cache[arg] {
return result
}
let result = function(arg)
cache[arg] = result
return result
}
}```swift
// Memoization function that caches the results of expensive computations.
func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { (arg: T) -> U in
if let result = cache[arg] {
return result
}
let result = function(arg)
cache[arg] = result
return result
}
}
// Example usage:
let expensive = memoize { (n: Int) -> Int in
print("Calculating \(n) ...")
return n * n
}
expensive(2) // Calculating 2 ...
expensive(2) // 4
expensive(2) // 4
expensive(3) // Calculating 3 ...
expensive(3) // 9
expensive(3) // 9
```func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { (arg: T) -> U in
if let result = cache[arg] {
return result
} else {
let result = function(arg)
cache[arg] = result
return result
}
}
}```swift
// Memoization function that caches the results of expensive computations.
func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { (arg: T) -> U in
if let result = cache[arg] {
return result
} else {
let result = function(arg)
cache[arg] = result
return result
}
}
}
```func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { (arg: T) -> U in
if let result = cache[arg] {
return result
} else {
let result = function(arg)
cache[arg] = result
return result
}
}
}```swift
// Memoization function that caches the results of expensive computations.
func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { (arg: T) -> U in
if let result = cache[arg] {
return result
} else {
let result = function(arg)
cache[arg] = result
return result
}
}
}
// Memoized function that returns the number of ways to make change for a given amount.
let makeChange = memoize { (amount: Int) -> Int in
if amount == 0 {
return 1
} else if amount < 0 {
return 0
} else {
return makeChange(amount - 1) + makeChange(amount - 2) + makeChange(amount - 5)
}
}
// Test the memoized function.
print(makeChange(10)) // 11
print(makeChange(10)) // 11
```func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { (arg: T) -> U in
if let result = cache[arg] {
return result
} else {
let result = function(arg)
cache[arg] = result
return result
}
}
}```swift
// Memoization function that caches the results of expensive computations.
func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { (arg: T) -> U in
if let result = cache[arg] {
return result
} else {
let result = function(arg)
cache[arg] = result
return result
}
}
}
// Memoized function that returns the number of digits in an integer.
let countDigits = memoize { (n: Int) -> Int in
var count = 1
var n = n
while n >= 10 {
n /= 10
count += 1
}
return count
}
// Memoized function that returns the nth Fibonacci number.
let fibonacci = memoize { (n: Int) -> Int in
if n <= 1 {
return n
} else {
return fibonacci(n-1) + fibonacci(n-2)
}
}
// Memoized function that returns the number of ways to make change for an amount, given a set of coins.
let waysToMakeChange = memoize { (amount: Int, coins: [Int]) -> Int in
if amount == 0 {
return 1
} else if amount < 0 || coins.isEmpty {
return 0
} else {
return waysToMakeChange(amount, Array(coins.dropFirst())) + waysToMakeChange(amount - coins.first!, coins)
}
}
// Memoized function that returns the number of ways to make change for an amount, given a set of coins.
let waysToMakeChange2 = memoize { (amount: Int, coins: [Int]) -> Int in
if amount == 0 {
return 1
} else if amount < 0 || coins.isEmpty {
return 0
} else {
return waysToMakeChange2(amount, Array(coins.dropFirst())) + waysToMakeChange2(amount - coins.first!, coins)
}
}
// Memoized function that returns the number of ways to make change for an amount, given a set of coins.
let waysToMakeChange3 = memoize { (amount: Int, coins: [Int]) -> Int in
if amount == 0 {
return 1
} else if amount < 0 || coins.isEmpty {
return 0
} else {
return waysToMakeChange3(amount, Array(coins.dropFirst())) + waysToMakeChange3(amount - coins.first!, coins)
}
}
// Memoized function that returns the number of ways to make change for an amount, given a set of coins.
let waysToMakeChange4 = memoize { (amount: Int, coins: [Int]) -> Int in
if amount == 0 {
return 1
} else if amount < 0 || coins.isEmpty {
return 0
} else {
return waysToMakeChange4(amount, Array(coins.dropFirst())) + waysToMakeChange4(amount - coins.first!, coins)
}
}
// Memoized function that returns the number of ways to make change for an amount, given a set of coins.
let waysToMakeChange5 = memoize { (amount: Int, coins: [Int]) -> Int in
if amount == 0 {
return 1
} else if amount < 0 || coins.isEmpty {
return 0
} else {
return waysToMakeChange5(amount, Array(coins.dropFirst())) + waysToMakeChange5(amount - coins.first!, coins)
}
}
// Memoized function that returns the number of ways to make change for an amount, given a set of coins.
let waysToMakeChange6 = memoize { (amount: Int, coins: [Int]) -> Int in
if amount == 0 {
return 1
} else if amount < 0 || coins.isEmpty {
return 0
} else {
return waysToMakeChange6(amount, Array(coins.dropFirst())) + waysToMakeChange6(amount - coins.first!, coins)
}
}
// Memfunc memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { (arg: T) -> U in
if let result = cache[arg] {
return result
}
let result = function(arg)
cache[arg] = result
return result
}
}```swift
// Memoization function that caches the results of expensive computations.
func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { (arg: T) -> U in
if let result = cache[arg] {
return result
}
let result = function(arg)
cache[arg] = result
return result
}
}
```func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { (arg: T) -> U in
if let result = cache[arg] {
return result
} else {
let result = function(arg)
cache[arg] = result
return result
}
}
}```swift
// Memoization function that caches the results of expensive computations.
func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { (arg: T) -> U in
if let result = cache[arg] {
return result
} else {
let result = function(arg)
cache[arg] = result
return result
}
}
}
```func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { (arg: T) -> U in
if let result = cache[arg] {
return result
}
let result = function(arg)
cache[arg] = result
return result
}
}```swift
// Memoization function that caches the results of expensive computations.
func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { (arg: T) -> U in
if let result = cache[arg] {
return result
}
let result = function(arg)
cache[arg] = result
return result
}
}
```func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { (arg: T) -> U in
if let result = cache[arg] {
return result
}
let result = function(arg)
cache[arg] = result
return result
}
}```swift
// Memoization function that caches the results of expensive computations.
func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { (arg: T) -> U in
if let result = cache[arg] {
return result
}
let result = function(arg)
cache[arg] = result
return result
}
}
```func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var currentAttempt = 0
var lastError: Error?
while currentAttempt < attempts {
do {
return try task()
} catch {
lastError = error
currentAttempt += 1
}
}
if let error = lastError {
throw error
}
fatalError("Attempted to retry a task \(attempts) times without success.")
}```swift
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var currentAttempt = 0
var lastError: Error?
while currentAttempt < attempts {
do {
return try task()
} catch {
lastError = error
currentAttempt += 1
}
}
if let error = lastError {
throw error
}
fatalError("Attempted to retry a task \(attempts) times without success.")
}
```func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var currentAttempt = 0
var lastError: Error?
while currentAttempt < attempts {
do {
return try task()
} catch {
lastError = error
currentAttempt += 1
}
}
if let error = lastError {
throw error
} else {
fatalError("Attempted to retry a task \(attempts) times without succeeding.")
}
}```swift
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var currentAttempt = 0
var lastError: Error?
while currentAttempt < attempts {
do {
return try task()
} catch {
lastError = error
currentAttempt += 1
}
}
if let error = lastError {
throw error
} else {
fatalError("Attempted to retry a task \(attempts) times without succeeding.")
}
}
```func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var currentAttempt = 0
while currentAttempt < attempts {
do {
return try task()
} catch {
currentAttempt += 1
}
}
throw error
}```swift
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var currentAttempt = 0
while currentAttempt < attempts {
do {
return try task()
} catch {
currentAttempt += 1
}
}
throw error
}
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var currentAttempt = 0
while currentAttempt < attempts {
do {
return try task()
} catch {
currentAttempt += 1
}
}
throw error
}
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var currentAttempt = 0
while currentAttempt < attempts {
do {
return try task()
} catch {
currentAttempt += 1
}
}
throw error
}
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var currentAttempt = 0
while currentAttempt < attempts {
do {
return try task()
} catch {
currentAttempt += 1
}
}
throw error
}
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var currentAttempt = 0
while currentAttempt < attempts {
do {
return try task()
} catch {
currentAttempt += 1
}
}
throw error
}
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var currentAttempt = 0
while currentAttempt < attempts {
do {
return try task()
} catch {
currentAttempt += 1
}
}
throw error
}
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var currentAttempt = 0
while currentAttempt < attempts {
do {
return try task()
} catch {
currentAttempt += 1
}
}
throw error
}
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var currentAttempt = 0
while currentAttempt < attempts {
do {
return try task()
} catch {
currentAttempt += 1
}
}
throw error
}
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var currentAttempt = 0
while currentAttempt < attempts {
do {
return try task()
} catch {
currentAttempt += 1
}
}
throw error
}
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var currentAttempt = 0
while currentAttempt < attempts {
do {
return try task()
} catch {
currentAttempt += 1
}
}
throw error
}
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var currentAttempt = 0
while currentAttempt < attempts {
do {
throw error // thrown expression type '(String) -> ()' does not conform to 'Error'throw error // expansion of macro 'error' requires leading '#'func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var currentAttempt = 0
while currentAttempt < attempts {
do {
return try task()
} catch {
currentAttempt += 1
}
}
throw error
}```swift
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var currentAttempt = 0
while currentAttempt < attempts {
do {
return try task()
} catch {
currentAttempt += 1
}
}
throw error
}
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var currentAttempt = 0
while currentAttempt < attempts {
do {
return try task()
} catch {
currentAttempt += 1
}
}
throw error
}
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var currentAttempt = 0
while currentAttempt < attempts {
do {
return try task()
} catch {
currentAttempt += 1
}
}
throw error
}
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var currentAttempt = 0
while currentAttempt < attempts {
do {
return try task()
} catch {
currentAttempt += 1
}
}
throw error
}
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var currentAttempt = 0
while currentAttempt < attempts {
do {
return try task()
} catch {
currentAttempt += 1
}
}
throw error
}
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var currentAttempt = 0
while currentAttempt < attempts {
do {
return try task()
} catch {
currentAttempt += 1
}
}
throw error
}
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var currentAttempt = 0
while currentAttempt < attempts {
do {
return try task()
} catch {
currentAttempt += 1
}
}
throw error
}
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var currentAttempt = 0
while currentAttempt < attempts {
do {
return try task()
} catch {
currentAttempt += 1
}
}
throw error
}
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var currentAttempt = 0
while currentAttempt < attempts {
do {
return try task()
} catch {
currentAttempt += 1
}
}
throw error
}
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var currentAttempt = 0
while currentAttempt < attempts {
do {
return try task()
} catch {
currentAttempt += 1
}
}
throw error
}
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var currentAttempt = 0
while currentAttempt < attempts {
do {
throw error // thrown expression type '(String) -> ()' does not conform to 'Error'throw error // expansion of macro 'error' requires leading '#'func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var currentAttempt = 0
var lastError: Error?
while currentAttempt < attempts {
do {
return try task()
} catch {
lastError = error
currentAttempt += 1
}
}
if let error = lastError {
throw error
}
fatalError("Attempted to retry a task \(attempts) times without success.")
}```swift
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var currentAttempt = 0
var lastError: Error?
while currentAttempt < attempts {
do {
return try task()
} catch {
lastError = error
currentAttempt += 1
}
}
if let error = lastError {
throw error
}
fatalError("Attempted to retry a task \(attempts) times without success.")
}
```func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var currentAttempt = 0
while currentAttempt < attempts {
do {
return try task()
} catch {
currentAttempt += 1
}
}
throw error
}```swift
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var currentAttempt = 0
while currentAttempt < attempts {
do {
return try task()
} catch {
currentAttempt += 1
}
}
throw error
}
```throw error // thrown expression type '(String) -> ()' does not conform to 'Error'throw error // expansion of macro 'error' requires leading '#'func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var currentAttempt = 0
var lastError: Error?
while currentAttempt < attempts {
do {
return try task()
} catch {
lastError = error
currentAttempt += 1
}
}
if let error = lastError {
throw error
} else {
fatalError("Attempted to retry a task \(attempts) times without catching an error.")
}
}```swift
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var currentAttempt = 0
var lastError: Error?
while currentAttempt < attempts {
do {
return try task()
} catch {
lastError = error
currentAttempt += 1
}
}
if let error = lastError {
throw error
} else {
fatalError("Attempted to retry a task \(attempts) times without catching an error.")
}
}
// Example usage:
do {
let result = try retry(attempts: 3) {
// This task will be retried 3 times if it fails.
throw NSError(domain: "com.example.error", code: 1, userInfo: nil)
}
print(result)
} catch {
print(error)
}
```func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var currentAttempt = 0
var lastError: Error?
while currentAttempt < attempts {
do {
return try task()
} catch {
lastError = error
currentAttempt += 1
}
}
if let error = lastError {
throw error
}
fatalError("Unreachable code reached")
}```swift
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var currentAttempt = 0
var lastError: Error?
while currentAttempt < attempts {
do {
return try task()
} catch {
lastError = error
currentAttempt += 1
}
}
if let error = lastError {
throw error
}
fatalError("Unreachable code reached")
}
// Example usage:
do {
try retry(attempts: 3) {
// Perform some task that may fail.
}
} catch {
// Handle the error.
}
```func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var currentAttempt = 0
while currentAttempt < attempts {
do {
return try task()
} catch {
currentAttempt += 1
}
}
throw error
}```swift
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var currentAttempt = 0
while currentAttempt < attempts {
do {
return try task()
} catch {
currentAttempt += 1
}
}
throw error
}
```throw error // thrown expression type '(String) -> ()' does not conform to 'Error'throw error // expansion of macro 'error' requires leading '#'func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var currentAttempt = 0
while currentAttempt < attempts {
do {
return try task()
} catch {
currentAttempt += 1
}
}
throw error
}```swift
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var currentAttempt = 0
while currentAttempt < attempts {
do {
return try task()
} catch {
currentAttempt += 1
}
}
throw error
}
```throw error // thrown expression type '(String) -> ()' does not conform to 'Error'throw error // expansion of macro 'error' requires leading '#'protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
class DIContainer: DIContainerProtocol {
private var factories: [ObjectIdentifier: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[ObjectIdentifier(type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = factories[ObjectIdentifier(type)] else { return nil }
return factory() as? T
}
}```swift
protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
// Simple dependency injection (DI) container.
class DIContainer: DIContainerProtocol {
private var factories: [ObjectIdentifier: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[ObjectIdentifier(type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = factories[ObjectIdentifier(type)] else { return nil }
return factory() as? T
}
}
```protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
class DIContainer: DIContainerProtocol {
private var factories: [ObjectIdentifier: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[ObjectIdentifier(type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = factories[ObjectIdentifier(type)] else {
return nil
}
return factory() as? T
}
}```swift
protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
// Simple dependency injection (DI) container.
class DIContainer: DIContainerProtocol {
private var factories: [ObjectIdentifier: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[ObjectIdentifier(type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = factories[ObjectIdentifier(type)] else {
return nil
}
return factory() as? T
}
}
```protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
class DIContainer: DIContainerProtocol {
private var factories: [ObjectIdentifier: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[ObjectIdentifier(type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = factories[ObjectIdentifier(type)] else {
return nil
}
return factory() as? T
}
}```swift
protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
// Simple dependency injection (DI) container.
class DIContainer: DIContainerProtocol {
private var factories: [ObjectIdentifier: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[ObjectIdentifier(type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = factories[ObjectIdentifier(type)] else {
return nil
}
return factory() as? T
}
}
```protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
class DIContainer: DIContainerProtocol {
private var factories: [ObjectIdentifier: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[ObjectIdentifier(type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = factories[ObjectIdentifier(type)] else { return nil }
return factory() as? T
}
}```swift
protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
// Simple dependency injection (DI) container.
class DIContainer: DIContainerProtocol {
private var factories: [ObjectIdentifier: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[ObjectIdentifier(type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = factories[ObjectIdentifier(type)] else { return nil }
return factory() as? T
}
}
```protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
class DIContainer: DIContainerProtocol {
private var factories: [ObjectIdentifier: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[ObjectIdentifier(type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = factories[ObjectIdentifier(type)] else { return nil }
return factory() as? T
}
}```swift
protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
// Simple dependency injection (DI) container.
class DIContainer: DIContainerProtocol {
private var factories: [ObjectIdentifier: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[ObjectIdentifier(type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = factories[ObjectIdentifier(type)] else { return nil }
return factory() as? T
}
}
```protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
class DIContainer: DIContainerProtocol {
private var factories: [ObjectIdentifier: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[ObjectIdentifier(type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = factories[ObjectIdentifier(type)] else {
return nil
}
return factory() as? T
}
}```swift
protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
// Simple dependency injection (DI) container.
class DIContainer: DIContainerProtocol {
private var factories: [ObjectIdentifier: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[ObjectIdentifier(type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = factories[ObjectIdentifier(type)] else {
return nil
}
return factory() as? T
}
}
// Usage:
let container = DIContainer()
container.register(Int.self) { 42 }
let value = container.resolve(Int.self)
```protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
class DIContainer: DIContainerProtocol {
private var factories: [ObjectIdentifier: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[ObjectIdentifier(type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = factories[ObjectIdentifier(type)] else { return nil }
return factory() as? T
}
}```swift
protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
// Simple dependency injection (DI) container.
class DIContainer: DIContainerProtocol {
private var factories: [ObjectIdentifier: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[ObjectIdentifier(type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = factories[ObjectIdentifier(type)] else { return nil }
return factory() as? T
}
}
```protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
class DIContainer: DIContainerProtocol {
private var factories: [ObjectIdentifier: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[ObjectIdentifier(type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = factories[ObjectIdentifier(type)] else { return nil }
return factory() as? T
}
}```swift
protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
// Simple dependency injection (DI) container.
class DIContainer: DIContainerProtocol {
private var factories: [ObjectIdentifier: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[ObjectIdentifier(type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = factories[ObjectIdentifier(type)] else { return nil }
return factory() as? T
}
}
// Usage:
let container = DIContainer()
container.register(String.self) { "Hello, World!" }
let string = container.resolve(String.self)
print(string) // "Hello, World!"
```protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
class DIContainer: DIContainerProtocol {
private var factories: [ObjectIdentifier: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[ObjectIdentifier(type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = factories[ObjectIdentifier(type)] else { return nil }
return factory() as? T
}
}```swift
protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
// Simple dependency injection (DI) container.
class DIContainer: DIContainerProtocol {
private var factories: [ObjectIdentifier: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[ObjectIdentifier(type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = factories[ObjectIdentifier(type)] else { return nil }
return factory() as? T
}
}
```protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
class DIContainer: DIContainerProtocol {
private var factories: [ObjectIdentifier: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[ObjectIdentifier(type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = factories[ObjectIdentifier(type)] else {
return nil
}
return factory() as? T
}
}```swift
protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
// Simple dependency injection (DI) container.
class DIContainer: DIContainerProtocol {
private var factories: [ObjectIdentifier: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[ObjectIdentifier(type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = factories[ObjectIdentifier(type)] else {
return nil
}
return factory() as? T
}
}
```protocol StateMachineProtocol {
associatedtype State: Hashable
associatedtype Event: Hashable
init(state: State)
var state: State { get }
func trigger(event: Event)
func registerTransition(from: State, to: State, event: Event)
}
class StateMachine<State, Event>: StateMachineProtocol {
private var state: State
private var transitions: [Transition]
required init(state: State) {
self.state = state
self.transitions = []
}
var currentState: State {
return state
}
func trigger(event: Event) {
guard let transition = transitions.first(where: { $0.event == event }) else {
return
}
state = transition.to
}
func registerTransition(from: State, to: State, event: Event) {
transitions.append(Transition(from: from, to: to, event: event))
}
private struct Transition {
let from: State
let to: State
let event: Event
}
}```swift
protocol StateMachineProtocol {
associatedtype State: Hashable
associatedtype Event: Hashable
init(state: State)
var state: State { get }
func trigger(event: Event)
func registerTransition(from: State, to: State, event: Event)
}
// Finite state machine with possibility to register custom transitions between states.
class StateMachine<State, Event>: StateMachineProtocol {
private var state: State
private var transitions: [Transition]
required init(state: State) {
self.state = state
self.transitions = []
}
var currentState: State {
return state
}
func trigger(event: Event) {
guard let transition = transitions.first(where: { $0.event == event }) else {
return
}
state = transition.to
}
func registerTransition(from: State, to: State, event: Event) {
transitions.append(Transition(from: from, to: to, event: event))
}
private struct Transition {
let from: State
let to: State
let event: Event
}
}
```class StateMachine<State, Event>: StateMachineProtocol { // type 'StateMachine<State, Event>' does not conform to protocol 'StateMachineProtocol'guard let transition = transitions.first(where: { $0.event == event }) else { // referencing operator function '==' on 'Equatable' requires that 'Event' conform to 'Equatable'XCTAssertEqual(stateMachine.state, .green) // 'state' is inaccessible due to 'private' protection levelXCTAssertEqual(stateMachine.state, .yellow) // 'state' is inaccessible due to 'private' protection levelXCTAssertEqual(stateMachine.state, .red) // 'state' is inaccessible due to 'private' protection levelXCTAssertEqual(stateMachine.state, .green) // 'state' is inaccessible due to 'private' protection levelprotocol StateMachineProtocol {
associatedtype State: Hashable
associatedtype Event: Hashable
init(state: State)
var state: State { get }
func trigger(event: Event)
func registerTransition(from: State, to: State, event: Event)
}
class StateMachine<State, Event>: StateMachineProtocol {
private var state: State
private var transitions: [Transition]
init(state: State) {
self.state = state
self.transitions = []
}
var currentState: State {
return state
}
func trigger(event: Event) {
guard let transition = transitions.first(where: { $0.event == event }) else {
return
}
state = transition.to
}
func registerTransition(from: State, to: State, event: Event) {
transitions.append(Transition(from: from, to: to, event: event))
}
struct Transition {
let from: State
let to: State
let event: Event
}
}
class PredefinedStateMachine<State, Event>: StateMachineProtocol {
private var state: State
private var transitions: [Transition]
init(state: State) {
self.state = state
self.transitions = []
}
var currentState: State {
return state
}
func trigger(event: Event) {
guard let transition = transitions.first(where: { $0.event == event }) else {
return
}
state = transition.to
}
func registerTransition(from: State, to: State, event: Event) {
transitions.append(Transition(from: from, to: to, event: event))
}
struct Transition {
let from: State
let to: State
let event: Event
}
}
class HybridStateMachine<State, Event>: StateMachineProtocol {
private var state: State
private var transitions: [Transition]
init(state: State) {
self.state = state
self.transitions = []
}
var currentState: State {
return state
}
func trigger(event: Event) {
guard let transition = transitions.first(where: { $0.event == event }) else {
return
}
state = transition.to
}
func registerTransition(from: State, to: State, event: Event) {
transitions.append(Transition(from: from, to: to, event: event))
}
struct Transition {
let from: State
let to: State
let event: Event
}
}```swift
protocol StateMachineProtocol {
associatedtype State: Hashable
associatedtype Event: Hashable
init(state: State)
var state: State { get }
func trigger(event: Event)
func registerTransition(from: State, to: State, event: Event)
}
// Finite state machine with possibility to register custom transitions between states.
class StateMachine<State, Event>: StateMachineProtocol {
private var state: State
private var transitions: [Transition]
init(state: State) {
self.state = state
self.transitions = []
}
var currentState: State {
return state
}
func trigger(event: Event) {
guard let transition = transitions.first(where: { $0.event == event }) else {
return
}
state = transition.to
}
func registerTransition(from: State, to: State, event: Event) {
transitions.append(Transition(from: from, to: to, event: event))
}
struct Transition {
let from: State
let to: State
let event: Event
}
}
// State machine with predefined transitions.
class PredefinedStateMachine<State, Event>: StateMachineProtocol {
private var state: State
private var transitions: [Transition]
init(state: State) {
self.state = state
self.transitions = []
}
var currentState: State {
return state
}
func trigger(event: Event) {
guard let transition = transitions.first(where: { $0.event == event }) else {
return
}
state = transition.to
}
func registerTransition(from: State, to: State, event: Event) {
transitions.append(Transition(from: from, to: to, event: event))
}
struct Transition {
let from: State
let to: State
let event: Event
}
}
// State machine with predefined transitions and possibility to register custom transitions between states.
class HybridStateMachine<State, Event>: StateMachineProtocol {
private var state: State
private var transitions: [Transition]
init(state: State) {
self.state = state
self.transitions = []
}
var currentState: State {
return state
}
func trigger(event: Event) {
guard let transition = transitions.first(where: { $0.event == event }) else {
return
}
state = transition.to
}
func registerTransition(from: State, to: State, event: Event) {
transitions.append(Transition(from: from, to: to, event: event))
}
struct Transition {
let from: State
let to: State
let event: Event
}
}
```class StateMachine<State, Event>: StateMachineProtocol { // type 'StateMachine<State, Event>' does not conform to protocol 'StateMachineProtocol'guard let transition = transitions.first(where: { $0.event == event }) else { // referencing operator function '==' on 'Equatable' requires that 'Event' conform to 'Equatable'class PredefinedStateMachine<State, Event>: StateMachineProtocol { // type 'PredefinedStateMachine<State, Event>' does not conform to protocol 'StateMachineProtocol'guard let transition = transitions.first(where: { $0.event == event }) else { // referencing operator function '==' on 'Equatable' requires that 'Event' conform to 'Equatable'class HybridStateMachine<State, Event>: StateMachineProtocol { // type 'HybridStateMachine<State, Event>' does not conform to protocol 'StateMachineProtocol'guard let transition = transitions.first(where: { $0.event == event }) else { // referencing operator function '==' on 'Equatable' requires that 'Event' conform to 'Equatable'XCTAssertEqual(stateMachine.state, .green) // 'state' is inaccessible due to 'private' protection levelXCTAssertEqual(stateMachine.state, .yellow) // 'state' is inaccessible due to 'private' protection levelXCTAssertEqual(stateMachine.state, .red) // 'state' is inaccessible due to 'private' protection levelXCTAssertEqual(stateMachine.state, .green) // 'state' is inaccessible due to 'private' protection levelprotocol StateMachineProtocol {
associatedtype State: Hashable
associatedtype Event: Hashable
init(state: State)
var state: State { get }
func trigger(event: Event)
func registerTransition(from: State, to: State, event: Event)
}
class StateMachine<State: Hashable, Event: Hashable>: StateMachineProtocol {
private var state: State
private var transitions: [Transition] = []
required init(state: State) {
self.state = state
}
func trigger(event: Event) {
guard let transition = transitions.first(where: { $0.event == event }) else {
return
}
guard transition.from == state else {
return
}
state = transition.to
}
func registerTransition(from: State, to: State, event: Event) {
transitions.append(Transition(from: from, to: to, event: event))
}
}
struct Transition {
let from: State
let to: State
let event: Event
}```swift
protocol StateMachineProtocol {
associatedtype State: Hashable
associatedtype Event: Hashable
init(state: State)
var state: State { get }
func trigger(event: Event)
func registerTransition(from: State, to: State, event: Event)
}
// Finite state machine with possibility to register custom transitions between states.
class StateMachine<State: Hashable, Event: Hashable>: StateMachineProtocol {
private var state: State
private var transitions: [Transition] = []
required init(state: State) {
self.state = state
}
func trigger(event: Event) {
guard let transition = transitions.first(where: { $0.event == event }) else {
return
}
guard transition.from == state else {
return
}
state = transition.to
}
func registerTransition(from: State, to: State, event: Event) {
transitions.append(Transition(from: from, to: to, event: event))
}
}
struct Transition {
let from: State
let to: State
let event: Event
}
```private var state: State // property 'state' must be declared internal because it matches a requirement in internal protocol 'StateMachineProtocol'let from: State // cannot find type 'State' in scopelet to: State // cannot find type 'State' in scopelet event: Event // cannot find type 'Event' in scopeprotocol StateMachineProtocol {
associatedtype State: Hashable
associatedtype Event: Hashable
init(state: State)
var state: State { get }
func trigger(event: Event)
func registerTransition(from: State, to: State, event: Event)
}
class StateMachine<State, Event>: StateMachineProtocol {
typealias Transition = (from: State, to: State, event: Event)
private var transitions: [Transition] = []
private var state: State
required init(state: State) {
self.state = state
}
var currentState: State {
return state
}
func registerTransition(from: State, to: State, event: Event) {
transitions.append((from, to, event))
}
func trigger(event: Event) {
guard let transition = transitions.first(where: { $0.event == event && $0.from == state }) else {
return
}
state = transition.to
}
}```swift
protocol StateMachineProtocol {
associatedtype State: Hashable
associatedtype Event: Hashable
init(state: State)
var state: State { get }
func trigger(event: Event)
func registerTransition(from: State, to: State, event: Event)
}
// Finite state machine with possibility to register custom transitions between states.
class StateMachine<State, Event>: StateMachineProtocol {
typealias Transition = (from: State, to: State, event: Event)
private var transitions: [Transition] = []
private var state: State
required init(state: State) {
self.state = state
}
var currentState: State {
return state
}
func registerTransition(from: State, to: State, event: Event) {
transitions.append((from, to, event))
}
func trigger(event: Event) {
guard let transition = transitions.first(where: { $0.event == event && $0.from == state }) else {
return
}
state = transition.to
}
}
// Example usage
let machine = StateMachine(state: "A")
machine.registerTransition(from: "A", to: "B", event: "event")
machine.trigger(event: "event")
print(machine.currentState) // B
```class StateMachine<State, Event>: StateMachineProtocol { // type 'StateMachine<State, Event>' does not conform to protocol 'StateMachineProtocol'guard let transition = transitions.first(where: { $0.event == event && $0.from == state }) else { // referencing operator function '==' on 'Equatable' requires that 'Event' conform to 'Equatable'guard let transition = transitions.first(where: { $0.event == event && $0.from == state }) else { // referencing operator function '==' on 'Equatable' requires that 'State' conform to 'Equatable'XCTAssertEqual(stateMachine.state, .green) // 'state' is inaccessible due to 'private' protection levelXCTAssertEqual(stateMachine.state, .yellow) // 'state' is inaccessible due to 'private' protection levelXCTAssertEqual(stateMachine.state, .red) // 'state' is inaccessible due to 'private' protection levelXCTAssertEqual(stateMachine.state, .green) // 'state' is inaccessible due to 'private' protection levelprotocol StateMachineProtocol {
associatedtype State: Hashable
associatedtype Event: Hashable
init(state: State)
var state: State { get }
func trigger(event: Event)
func registerTransition(from: State, to: State, event: Event)
}
class StateMachine<State, Event>: StateMachineProtocol {
private var state: State
private var transitions: [Transition] = []
required init(state: State) {
self.state = state
}
func trigger(event: Event) {
guard let transition = transitions.first(where: { $0.event == event }) else {
return
}
state = transition.to
}
func registerTransition(from: State, to: State, event: Event) {
transitions.append(Transition(from: from, to: to, event: event))
}
}
struct Transition {
let from: State
let to: State
let event: Event
}```swift
protocol StateMachineProtocol {
associatedtype State: Hashable
associatedtype Event: Hashable
init(state: State)
var state: State { get }
func trigger(event: Event)
func registerTransition(from: State, to: State, event: Event)
}
// Finite state machine with possibility to register custom transitions between states.
class StateMachine<State, Event>: StateMachineProtocol {
private var state: State
private var transitions: [Transition] = []
required init(state: State) {
self.state = state
}
func trigger(event: Event) {
guard let transition = transitions.first(where: { $0.event == event }) else {
return
}
state = transition.to
}
func registerTransition(from: State, to: State, event: Event) {
transitions.append(Transition(from: from, to: to, event: event))
}
}
// Transition between states.
struct Transition {
let from: State
let to: State
let event: Event
}
```class StateMachine<State, Event>: StateMachineProtocol { // type 'StateMachine<State, Event>' does not conform to protocol 'StateMachineProtocol'let from: State // cannot find type 'State' in scopelet to: State // cannot find type 'State' in scopelet event: Event // cannot find type 'Event' in scopeXCTAssertEqual(stateMachine.state, .green) // 'state' is inaccessible due to 'private' protection levelXCTAssertEqual(stateMachine.state, .yellow) // 'state' is inaccessible due to 'private' protection levelXCTAssertEqual(stateMachine.state, .red) // 'state' is inaccessible due to 'private' protection levelXCTAssertEqual(stateMachine.state, .green) // 'state' is inaccessible due to 'private' protection levelprotocol StateMachineProtocol {
associatedtype State: Hashable
associatedtype Event: Hashable
init(state: State)
var state: State { get }
func trigger(event: Event)
func registerTransition(from: State, to: State, event: Event)
}
class StateMachine<State: Hashable, Event: Hashable>: StateMachineProtocol {
private var state: State
private var transitions: [Transition]
required init(state: State) {
self.state = state
self.transitions = []
}
func trigger(event: Event) {
guard let transition = transitions.first(where: { $0.event == event }) else {
return
}
state = transition.to
}
func registerTransition(from: State, to: State, event: Event) {
transitions.append(Transition(from: from, to: to, event: event))
}
}
struct Transition {
let from: State
let to: State
let event: Event
}```swift
protocol StateMachineProtocol {
associatedtype State: Hashable
associatedtype Event: Hashable
init(state: State)
var state: State { get }
func trigger(event: Event)
func registerTransition(from: State, to: State, event: Event)
}
// Finite state machine with possibility to register custom transitions between states.
class StateMachine<State: Hashable, Event: Hashable>: StateMachineProtocol {
private var state: State
private var transitions: [Transition]
required init(state: State) {
self.state = state
self.transitions = []
}
func trigger(event: Event) {
guard let transition = transitions.first(where: { $0.event == event }) else {
return
}
state = transition.to
}
func registerTransition(from: State, to: State, event: Event) {
transitions.append(Transition(from: from, to: to, event: event))
}
}
// Transition between states.
struct Transition {
let from: State
let to: State
let event: Event
}
```private var state: State // property 'state' must be declared internal because it matches a requirement in internal protocol 'StateMachineProtocol'let from: State // cannot find type 'State' in scopelet to: State // cannot find type 'State' in scopelet event: Event // cannot find type 'Event' in scopeprotocol StateMachineProtocol {
associatedtype State: Hashable
associatedtype Event: Hashable
init(state: State)
var state: State { get }
func trigger(event: Event)
func registerTransition(from: State, to: State, event: Event)
}
class StateMachine<State, Event>: StateMachineProtocol {
private var state: State
private var transitions: [Transition] = []
required init(state: State) {
self.state = state
}
func trigger(event: Event) {
guard let transition = transitions.first(where: { $0.event == event }) else {
return
}
state = transition.to
}
func registerTransition(from: State, to: State, event: Event) {
transitions.append(Transition(from: from, to: to, event: event))
}
}
struct Transition {
let from: State
let to: State
let event: Event
}```swift
protocol StateMachineProtocol {
associatedtype State: Hashable
associatedtype Event: Hashable
init(state: State)
var state: State { get }
func trigger(event: Event)
func registerTransition(from: State, to: State, event: Event)
}
// Finite state machine with possibility to register custom transitions between states.
class StateMachine<State, Event>: StateMachineProtocol {
private var state: State
private var transitions: [Transition] = []
required init(state: State) {
self.state = state
}
func trigger(event: Event) {
guard let transition = transitions.first(where: { $0.event == event }) else {
return
}
state = transition.to
}
func registerTransition(from: State, to: State, event: Event) {
transitions.append(Transition(from: from, to: to, event: event))
}
}
struct Transition {
let from: State
let to: State
let event: Event
}
```class StateMachine<State, Event>: StateMachineProtocol { // type 'StateMachine<State, Event>' does not conform to protocol 'StateMachineProtocol'let from: State // cannot find type 'State' in scopelet to: State // cannot find type 'State' in scopelet event: Event // cannot find type 'Event' in scopeXCTAssertEqual(stateMachine.state, .green) // 'state' is inaccessible due to 'private' protection levelXCTAssertEqual(stateMachine.state, .yellow) // 'state' is inaccessible due to 'private' protection levelXCTAssertEqual(stateMachine.state, .red) // 'state' is inaccessible due to 'private' protection levelXCTAssertEqual(stateMachine.state, .green) // 'state' is inaccessible due to 'private' protection levelprotocol StateMachineProtocol {
associatedtype State: Hashable
associatedtype Event: Hashable
init(state: State)
var state: State { get }
func trigger(event: Event)
func registerTransition(from: State, to: State, event: Event)
}
class StateMachine<State, Event>: StateMachineProtocol {
private var state: State
private var transitions: [Transition]
init(state: State) {
self.state = state
self.transitions = []
}
var currentState: State {
return state
}
func trigger(event: Event) {
let transition = transitions.first(where: { $0.event == event })
guard let transition = transition else { return }
state = transition.to
}
func registerTransition(from: State, to: State, event: Event) {
transitions.append(Transition(from: from, to: to, event: event))
}
}
struct Transition {
let from: State
let to: State
let event: Event
}```swift
protocol StateMachineProtocol {
associatedtype State: Hashable
associatedtype Event: Hashable
init(state: State)
var state: State { get }
func trigger(event: Event)
func registerTransition(from: State, to: State, event: Event)
}
// Finite state machine with possibility to register custom transitions between states.
class StateMachine<State, Event>: StateMachineProtocol {
private var state: State
private var transitions: [Transition]
init(state: State) {
self.state = state
self.transitions = []
}
var currentState: State {
return state
}
func trigger(event: Event) {
let transition = transitions.first(where: { $0.event == event })
guard let transition = transition else { return }
state = transition.to
}
func registerTransition(from: State, to: State, event: Event) {
transitions.append(Transition(from: from, to: to, event: event))
}
}
// Transition between states.
struct Transition {
let from: State
let to: State
let event: Event
}
```class StateMachine<State, Event>: StateMachineProtocol { // type 'StateMachine<State, Event>' does not conform to protocol 'StateMachineProtocol'let from: State // cannot find type 'State' in scopelet to: State // cannot find type 'State' in scopelet event: Event // cannot find type 'Event' in scopeXCTAssertEqual(stateMachine.state, .green) // 'state' is inaccessible due to 'private' protection levelXCTAssertEqual(stateMachine.state, .yellow) // 'state' is inaccessible due to 'private' protection levelXCTAssertEqual(stateMachine.state, .red) // 'state' is inaccessible due to 'private' protection levelXCTAssertEqual(stateMachine.state, .green) // 'state' is inaccessible due to 'private' protection levelprotocol StateMachineProtocol {
associatedtype State: Hashable
associatedtype Event: Hashable
init(state: State)
var state: State { get }
func trigger(event: Event)
func registerTransition(from: State, to: State, event: Event)
}
class StateMachine<State: Hashable, Event: Hashable>: StateMachineProtocol {
private var state: State
private var transitions: [Transition] = []
required init(state: State) {
self.state = state
}
func trigger(event: Event) {
guard let transition = transitions.first(where: { $0.event == event }) else {
return
}
state = transition.to
}
func registerTransition(from: State, to: State, event: Event) {
transitions.append(Transition(from: from, to: to, event: event))
}
}
struct Transition {
let from: State
let to: State
let event: Event
}```swift
protocol StateMachineProtocol {
associatedtype State: Hashable
associatedtype Event: Hashable
init(state: State)
var state: State { get }
func trigger(event: Event)
func registerTransition(from: State, to: State, event: Event)
}
// Finite state machine with possibility to register custom transitions between states.
class StateMachine<State: Hashable, Event: Hashable>: StateMachineProtocol {
private var state: State
private var transitions: [Transition] = []
required init(state: State) {
self.state = state
}
func trigger(event: Event) {
guard let transition = transitions.first(where: { $0.event == event }) else {
return
}
state = transition.to
}
func registerTransition(from: State, to: State, event: Event) {
transitions.append(Transition(from: from, to: to, event: event))
}
}
// Transition between states.
struct Transition {
let from: State
let to: State
let event: Event
}
```private var state: State // property 'state' must be declared internal because it matches a requirement in internal protocol 'StateMachineProtocol'let from: State // cannot find type 'State' in scopelet to: State // cannot find type 'State' in scopelet event: Event // cannot find type 'Event' in scopeprotocol StateMachineProtocol {
associatedtype State: Hashable
associatedtype Event: Hashable
init(state: State)
var state: State { get }
func trigger(event: Event)
func registerTransition(from: State, to: State, event: Event)
}
class StateMachine<State, Event>: StateMachineProtocol {
private var state: State
private var transitions: [Transition]
required init(state: State) {
self.state = state
self.transitions = []
}
var currentState: State {
return state
}
func trigger(event: Event) {
let transition = transitions.first { $0.from == state && $0.event == event }
guard let transition = transition else { return }
state = transition.to
}
func registerTransition(from: State, to: State, event: Event) {
transitions.append(Transition(from: from, to: to, event: event))
}
}
struct Transition {
let from: State
let to: State
let event: Event
}```swift
protocol StateMachineProtocol {
associatedtype State: Hashable
associatedtype Event: Hashable
init(state: State)
var state: State { get }
func trigger(event: Event)
func registerTransition(from: State, to: State, event: Event)
}
// Finite state machine with possibility to register custom transitions between states.
class StateMachine<State, Event>: StateMachineProtocol {
private var state: State
private var transitions: [Transition]
required init(state: State) {
self.state = state
self.transitions = []
}
var currentState: State {
return state
}
func trigger(event: Event) {
let transition = transitions.first { $0.from == state && $0.event == event }
guard let transition = transition else { return }
state = transition.to
}
func registerTransition(from: State, to: State, event: Event) {
transitions.append(Transition(from: from, to: to, event: event))
}
}
// Transition between states.
struct Transition {
let from: State
let to: State
let event: Event
}
```class StateMachine<State, Event>: StateMachineProtocol { // type 'StateMachine<State, Event>' does not conform to protocol 'StateMachineProtocol'let transition = transitions.first { $0.from == state && $0.event == event } // cannot call value of non-function type 'Transition?'let from: State // cannot find type 'State' in scopelet to: State // cannot find type 'State' in scopelet event: Event // cannot find type 'Event' in scopeXCTAssertEqual(stateMachine.state, .green) // 'state' is inaccessible due to 'private' protection levelXCTAssertEqual(stateMachine.state, .yellow) // 'state' is inaccessible due to 'private' protection levelXCTAssertEqual(stateMachine.state, .red) // 'state' is inaccessible due to 'private' protection levelXCTAssertEqual(stateMachine.state, .green) // 'state' is inaccessible due to 'private' protection levelindirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(_, let size):
return size
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file:
return 0
case .directory(_, let contents):
return 1 + contents.reduce(0) { max($0, $1.treeDepth) }
}
}
}
struct FileSystemManager {
let root: FileSystemNode
init(root: FileSystemNode) {
self.root = root
}
func metadata() -> FileSystemInfo {
return root
}
}
struct FileSystemNode {
let name: String
let contents: [FileSystemNode]
init(name: String, contents: [FileSystemNode]) {
self.name = name
self.contents = contents
}
}
struct File {
let name: String
let size: Int
init(name: String, size: Int) {
self.name = name
self.size = size
}
}
struct Directory {
let name: String
let contents: [FileSystemNode]
init(name: String, contents: [FileSystemNode]) {
self.name = name
self.contents = contents
}
}
struct FileSystem {
let root: FileSystemNode
init(root: FileSystemNode) {
self.root = root
}
}```swift
indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(_, let size):
return size
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file:
return 0
case .directory(_, let contents):
return 1 + contents.reduce(0) { max($0, $1.treeDepth) }
}
}
}
// Concrete file system manager.
// Used to create file system tree and calculate metadata.
struct FileSystemManager {
let root: FileSystemNode
init(root: FileSystemNode) {
self.root = root
}
func metadata() -> FileSystemInfo {
return root
}
}
// Concrete file system node.
// Used to create file system tree.
struct FileSystemNode {
let name: String
let contents: [FileSystemNode]
init(name: String, contents: [FileSystemNode]) {
self.name = name
self.contents = contents
}
}
// Concrete file system node.
// Used to create file system tree.
struct File {
let name: String
let size: Int
init(name: String, size: Int) {
self.name = name
self.size = size
}
}
// Concrete file system node.
// Used to create file system tree.
struct Directory {
let name: String
let contents: [FileSystemNode]
init(name: String, contents: [FileSystemNode]) {
self.name = name
self.contents = contents
}
}
// Concrete file system node.
// Used to create file system tree.
struct FileSystem {
let root: FileSystemNode
init(root: FileSystemNode) {
self.root = root
}
}
// Concrete file system node.
// Used to create file system tree.
struct FileSystemNode {
let name: String
let contents: [FileSystemNode]
init(name: String, contents: [FileSystemNode]) {
self.name = name
self.contents = contents
}
}
// Concrete file system node.
// Used to create file system tree.
struct File {
let name: String
let size: Int
init(name: String, size: Int) {
self.name = name
self.size = size
}
}
// Concrete file system node.
// Used to create file system tree.
struct Directory {
let name: String
let contents: [FileSystemNode]
init(name: String, contents: [FileSystemNode]) {
self.name = name
self.contents = contents
}
}
// Concrete file system node.
// Used to create file system tree.
struct FileSystem {
let root: FileSystemNode
init(root: FileSystemNode) {
self.root = root
}
}
// Concrete file system node.
// Used to create file system tree.
struct FileSystemNode {
let name: String
let contents: [FileSystemNode]
init(name: String, contents: [FileSystemNode]) {
self.name = name
self.contents = contents
}
}
// Concrete file system node.
// Used to create file system tree.
struct File {
let name: String
let size: Int
init(name: String, size: Int) {
self.name = name
self.size = size
}
}
// Concrete file system node.
// Used to create file system tree.
struct Directory {
let name: String
let contents: [FileSystemNode]
init(name: String, contents: [FileSystemNode]) {
case directory(name: String, contents: [FileSystemNode]) // 'FileSystemNode' is ambiguous for type lookup in this contextextension FileSystemNode: FileSystemInfo { // 'FileSystemNode' is ambiguous for type lookup in this contextlet root: FileSystemNode // 'FileSystemNode' is ambiguous for type lookup in this contextinit(root: FileSystemNode) { // 'FileSystemNode' is ambiguous for type lookup in this contextstruct FileSystemNode { // invalid redeclaration of 'FileSystemNode'let contents: [FileSystemNode] // 'FileSystemNode' is ambiguous for type lookup in this contextinit(name: String, contents: [FileSystemNode]) { // 'FileSystemNode' is ambiguous for type lookup in this contextlet contents: [FileSystemNode] // 'FileSystemNode' is ambiguous for type lookup in this contextinit(name: String, contents: [FileSystemNode]) { // 'FileSystemNode' is ambiguous for type lookup in this contextlet root: FileSystemNode // 'FileSystemNode' is ambiguous for type lookup in this contextinit(root: FileSystemNode) { // 'FileSystemNode' is ambiguous for type lookup in this contextXCTAssertEqual(file.totalSize, 100) // value of type 'FileSystemNode' has no member 'totalSize'indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(_, let size):
return size
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file:
return 0
case .directory(_, let contents):
return 1 + contents.reduce(0) { max($0, $1.treeDepth) }
}
}
}
struct FileSystemManager {
let root: FileSystemNode
init(root: FileSystemNode) {
self.root = root
}
func metadata() -> FileSystemInfo {
return root
}
}
struct FileSystemNode {
let name: String
let contents: [FileSystemNode]
init(name: String, contents: [FileSystemNode]) {
self.name = name
self.contents = contents
}
}
struct File {
let name: String
let size: Int
init(name: String, size: Int) {
self.name = name
self.size = size
}
}
struct Directory {
let name: String
let contents: [FileSystemNode]
init(name: String, contents: [FileSystemNode]) {
self.name = name
self.contents = contents
}
}```swift
indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(_, let size):
return size
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file:
return 0
case .directory(_, let contents):
return 1 + contents.reduce(0) { max($0, $1.treeDepth) }
}
}
}
// Concrete file system manager.
// Used to create file system tree and calculate metadata.
struct FileSystemManager {
let root: FileSystemNode
init(root: FileSystemNode) {
self.root = root
}
func metadata() -> FileSystemInfo {
return root
}
}
// Concrete file system node.
// Used to create file system tree.
struct FileSystemNode {
let name: String
let contents: [FileSystemNode]
init(name: String, contents: [FileSystemNode]) {
self.name = name
self.contents = contents
}
}
// Concrete file system node.
// Used to create file system tree.
struct File {
let name: String
let size: Int
init(name: String, size: Int) {
self.name = name
self.size = size
}
}
// Concrete file system node.
// Used to create file system tree.
struct Directory {
let name: String
let contents: [FileSystemNode]
init(name: String, contents: [FileSystemNode]) {
self.name = name
self.contents = contents
}
}
// Concrete file system manager.
// Used to create file system tree and calculate metadata.
struct FileSystemManager {
let root: FileSystemNode
init(root: FileSystemNode) {
self.root = root
}
func metadata() -> FileSystemInfo {
return root
}
}
// Concrete file system node.
// Used to create file system tree.
struct File {
let name: String
let size: Int
init(name: String, size: Int) {
self.name = name
self.size = size
}
}
// Concrete file system node.
// Used to create file system tree.
struct Directory {
let name: String
let contents: [FileSystemNode]
init(name: String, contents: [FileSystemNode]) {
self.name = name
self.contents = contents
}
}
// Concrete file system manager.
// Used to create file system tree and calculate metadata.
struct FileSystemManager {
let root: FileSystemNode
init(root: FileSystemNode) {
self.root = root
}
func metadata() -> FileSystemInfo {
return root
}
}
// Concrete file system node.
// Used to create file system tree.
struct File {
let name: String
let size: Int
init(name: String, size: Int) {
self.name = name
self.size = size
}
}
// Concrete file system node.
// Used to create file system tree.
struct Directory {
let name: String
let contents: [FileSystemNode]
init(name: String, contents: [FileSystemNode]) {
self.name = name
self.contents = contents
}
}
// Concrete file system manager.
// Used to create file system tree and calculate metadata.
struct FileSystemManager {
let root: FileSystemNode
init(root: FileSystemNode) {
self.root = root
}
func metadata() -> FileSystemInfo {
return root
}
}
// Concrete file system node.
// Used to createcase directory(name: String, contents: [FileSystemNode]) // 'FileSystemNode' is ambiguous for type lookup in this contextextension FileSystemNode: FileSystemInfo { // 'FileSystemNode' is ambiguous for type lookup in this contextlet root: FileSystemNode // 'FileSystemNode' is ambiguous for type lookup in this contextinit(root: FileSystemNode) { // 'FileSystemNode' is ambiguous for type lookup in this contextstruct FileSystemNode { // invalid redeclaration of 'FileSystemNode'let contents: [FileSystemNode] // 'FileSystemNode' is ambiguous for type lookup in this contextinit(name: String, contents: [FileSystemNode]) { // 'FileSystemNode' is ambiguous for type lookup in this contextlet contents: [FileSystemNode] // 'FileSystemNode' is ambiguous for type lookup in this contextinit(name: String, contents: [FileSystemNode]) { // 'FileSystemNode' is ambiguous for type lookup in this contextXCTAssertEqual(file.totalSize, 100) // value of type 'FileSystemNode' has no member 'totalSize'indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(_, let size):
return size
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file:
return 0
case .directory(_, let contents):
return 1 + contents.max(by: { $0.treeDepth < $1.treeDepth })?.treeDepth ?? 0
}
}
}```swift
indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(_, let size):
return size
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file:
return 0
case .directory(_, let contents):
return 1 + contents.max(by: { $0.treeDepth < $1.treeDepth })?.treeDepth ?? 0
}
}
}
```return 1 + contents.max(by: { $0.treeDepth < $1.treeDepth })?.treeDepth ?? 0 // value of optional type 'Int?' must be unwrapped to a value of type 'Int'indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(_, let size):
return size
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file:
return 0
case .directory(_, let contents):
return 1 + contents.max(by: { $0.treeDepth < $1.treeDepth })?.treeDepth ?? 0
}
}
}
class FileSystemManager {
private let structure: [FileSystemNode]
init(structure: [FileSystemNode]) {
self.structure = structure
}
func createFileSystemTree() -> FileSystemNode {
return .directory(name: "", contents: structure)
}
}
class FileSystemStructure {
private let structure: [FileSystemNode]
init(structure: [FileSystemNode]) {
self.structure = structure
}
func createFileSystemTree() -> FileSystemNode {
return .directory(name: "", contents: structure)
}
}```swift
indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(_, let size):
return size
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file:
return 0
case .directory(_, let contents):
return 1 + contents.max(by: { $0.treeDepth < $1.treeDepth })?.treeDepth ?? 0
}
}
}
// Concrete file system manager.
// Used to create file system tree from given file system structure.
class FileSystemManager {
private let structure: [FileSystemNode]
init(structure: [FileSystemNode]) {
self.structure = structure
}
func createFileSystemTree() -> FileSystemNode {
return .directory(name: "", contents: structure)
}
}
// Concrete file system structure.
// Used to create file system tree from given file system structure.
class FileSystemStructure {
private let structure: [FileSystemNode]
init(structure: [FileSystemNode]) {
self.structure = structure
}
func createFileSystemTree() -> FileSystemNode {
return .directory(name: "", contents: structure)
}
}
// Concrete file system structure.
// Used to create file system tree from given file system structure.
class FileSystemStructure {
private let structure: [FileSystemNode]
init(structure: [FileSystemNode]) {
self.structure = structure
}
func createFileSystemTree() -> FileSystemNode {
return .directory(name: "", contents: structure)
}
}
// Concrete file system structure.
// Used to create file system tree from given file system structure.
class FileSystemStructure {
private let structure: [FileSystemNode]
init(structure: [FileSystemNode]) {
self.structure = structure
}
func createFileSystemTree() -> FileSystemNode {
return .directory(name: "", contents: structure)
}
}
// Concrete file system structure.
// Used to create file system tree from given file system structure.
class FileSystemStructure {
private let structure: [FileSystemNode]
init(structure: [FileSystemNode]) {
self.structure = structure
}
func createFileSystemTree() -> FileSystemNode {
return .directory(name: "", contents: structure)
}
}
// Concrete file system structure.
// Used to create file system tree from given file system structure.
class FileSystemStructure {
private let structure: [FileSystemNode]
init(structure: [FileSystemNode]) {
self.structure = structure
}
func createFileSystemTree() -> FileSystemNode {
return .directory(name: "", contents: structure)
}
}
// Concrete file system structure.
// Used to create file system tree from given file system structure.
class FileSystemStructure {
private let structure: [FileSystemNode]
init(structure: [FileSystemNode]) {
self.structure = structure
}
func createFileSystemTree() -> FileSystemNode {
return .directory(name: "", contents: structure)
}
}
// Concrete file system structure.
// Used to create file system tree from given file system structure.
class FileSystemStructure {
private let structure: [FileSystemNode]
init(structure: [FileSystemNode]) {
self.structure = structure
}
func createFileSystemTree() -> FileSystemNode {
return .directory(name: "", contents: structure)
}
}
// Concrete file system structure.
// Used to create file system tree from given file system structure.
class FileSystemStructure {
private let structure: [FileSystemNode]
init(structure:return 1 + contents.max(by: { $0.treeDepth < $1.treeDepth })?.treeDepth ?? 0 // value of optional type 'Int?' must be unwrapped to a value of type 'Int'indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(_, let size):
return size
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file:
return 0
case .directory(_, let contents):
return 1 + contents.reduce(0) { $0 > $1.treeDepth ? $0 : $1.treeDepth }
}
}
}
struct FileSystemManager {
let root: FileSystemNode
init(root: FileSystemNode) {
self.root = root
}
var metadata: FileSystemInfo {
return root
}
}
struct FileSystemNode {
let name: String
let contents: [FileSystemNode]
init(name: String, contents: [FileSystemNode]) {
self.name = name
self.contents = contents
}
}
struct File {
let name: String
let size: Int
init(name: String, size: Int) {
self.name = name
self.size = size
}
}
struct Directory {
let name: String
let contents: [FileSystemNode]
init(name: String, contents: [FileSystemNode]) {
self.name = name
self.contents = contents
}
}```swift
indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(_, let size):
return size
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file:
return 0
case .directory(_, let contents):
return 1 + contents.reduce(0) { $0 > $1.treeDepth ? $0 : $1.treeDepth }
}
}
}
// Concrete file system manager.
// Used to create file system tree and calculate metadata.
struct FileSystemManager {
let root: FileSystemNode
init(root: FileSystemNode) {
self.root = root
}
var metadata: FileSystemInfo {
return root
}
}
// Concrete file system node.
// Used to create file system tree.
struct FileSystemNode {
let name: String
let contents: [FileSystemNode]
init(name: String, contents: [FileSystemNode]) {
self.name = name
self.contents = contents
}
}
// Concrete file system node.
// Used to create file system tree.
struct File {
let name: String
let size: Int
init(name: String, size: Int) {
self.name = name
self.size = size
}
}
// Concrete file system node.
// Used to create file system tree.
struct Directory {
let name: String
let contents: [FileSystemNode]
init(name: String, contents: [FileSystemNode]) {
self.name = name
self.contents = contents
}
}
// Concrete file system manager.
// Used to create file system tree and calculate metadata.
struct FileSystemManager {
let root: FileSystemNode
init(root: FileSystemNode) {
self.root = root
}
var metadata: FileSystemInfo {
return root
}
}
// Concrete file system node.
// Used to create file system tree.
struct File {
let name: String
let size: Int
init(name: String, size: Int) {
self.name = name
self.size = size
}
}
// Concrete file system node.
// Used to create file system tree.
struct Directory {
let name: String
let contents: [FileSystemNode]
init(name: String, contents: [FileSystemNode]) {
self.name = name
self.contents = contents
}
}
// Concrete file system manager.
// Used to create file system tree and calculate metadata.
struct FileSystemManager {
let root: FileSystemNode
init(root: FileSystemNode) {
self.root = root
}
var metadata: FileSystemInfo {
return root
}
}
// Concrete file system node.
// Used to create file system tree.
struct File {
let name: String
let size: Int
init(name: String, size: Int) {
self.name = name
self.size = size
}
}
// Concrete file system node.
// Used to create file system tree.
struct Directory {
let name: String
let contents: [FileSystemNode]
init(name: String, contents: [FileSystemNode]) {
self.name = name
self.contents = contents
}
}
// Concrete file system manager.
// Used to create file system tree and calculate metadata.
struct FileSystemManager {
let root: FileSystemNode
init(root: FileSystemNode) {
self.root = root
}
var metadata: FileSystemInfo {
return root
}
}
// Concrete file system node.
//case directory(name: String, contents: [FileSystemNode]) // 'FileSystemNode' is ambiguous for type lookup in this contextextension FileSystemNode: FileSystemInfo { // 'FileSystemNode' is ambiguous for type lookup in this contextlet root: FileSystemNode // 'FileSystemNode' is ambiguous for type lookup in this contextinit(root: FileSystemNode) { // 'FileSystemNode' is ambiguous for type lookup in this contextstruct FileSystemNode { // invalid redeclaration of 'FileSystemNode'let contents: [FileSystemNode] // 'FileSystemNode' is ambiguous for type lookup in this contextinit(name: String, contents: [FileSystemNode]) { // 'FileSystemNode' is ambiguous for type lookup in this contextlet contents: [FileSystemNode] // 'FileSystemNode' is ambiguous for type lookup in this contextinit(name: String, contents: [FileSystemNode]) { // 'FileSystemNode' is ambiguous for type lookup in this contextXCTAssertEqual(file.totalSize, 100) // value of type 'FileSystemNode' has no member 'totalSize'indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(_, let size):
return size
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file:
return 0
case .directory(_, let contents):
return 1 + contents.max(by: { $0.treeDepth < $1.treeDepth })?.treeDepth ?? 0
}
}
}
class FileSystemManager {
private let root: FileSystemNode
init(root: FileSystemNode) {
self.root = root
}
func metadata() -> FileSystemInfo {
return root
}
}
class FileSystemTree {
private let root: FileSystemNode
init(root: FileSystemNode) {
self.root = root
}
func metadata() -> FileSystemInfo {
return root
}
}
class FileSystemNode {
private let name: String
private let size: Int
private let children: [FileSystemNode]
init(name: String, size: Int, children: [FileSystemNode]) {
self.name = name
self.size = size
self.children = children
}
func metadata() -> FileSystemInfo {
return self
}
}
class FileSystemLeaf {
private let name: String
private let size: Int
init(name: String, size: Int) {
self.name = name
self.size = size
}
func metadata() -> FileSystemInfo {
return self
}
}
class FileSystemDirectory {
private let name: String
private let children: [FileSystemNode]
init(name: String, children: [FileSystemNode]) {
self.name = name
self.children = children
}
func metadata() -> FileSystemInfo {
return self
}
}```swift
indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(_, let size):
return size
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file:
return 0
case .directory(_, let contents):
return 1 + contents.max(by: { $0.treeDepth < $1.treeDepth })?.treeDepth ?? 0
}
}
}
// Concrete file system manager.
// Used to create file system tree and calculate metadata.
class FileSystemManager {
private let root: FileSystemNode
init(root: FileSystemNode) {
self.root = root
}
func metadata() -> FileSystemInfo {
return root
}
}
// Concrete file system tree.
// Used to create file system tree and calculate metadata.
class FileSystemTree {
private let root: FileSystemNode
init(root: FileSystemNode) {
self.root = root
}
func metadata() -> FileSystemInfo {
return root
}
}
// Concrete file system node.
// Used to create file system tree and calculate metadata.
class FileSystemNode {
private let name: String
private let size: Int
private let children: [FileSystemNode]
init(name: String, size: Int, children: [FileSystemNode]) {
self.name = name
self.size = size
self.children = children
}
func metadata() -> FileSystemInfo {
return self
}
}
// Concrete file system leaf.
// Used to create file system tree and calculate metadata.
class FileSystemLeaf {
private let name: String
private let size: Int
init(name: String, size: Int) {
self.name = name
self.size = size
}
func metadata() -> FileSystemInfo {
return self
}
}
// Concrete file system directory.
// Used to create file system tree and calculate metadata.
class FileSystemDirectory {
private let name: String
private let children: [FileSystemNode]
init(name: String, children: [FileSystemNode]) {
self.name = name
self.children = children
}
func metadata() -> FileSystemInfo {
return self
}
}
```case directory(name: String, contents: [FileSystemNode]) // 'FileSystemNode' is ambiguous for type lookup in this contextextension FileSystemNode: FileSystemInfo { // 'FileSystemNode' is ambiguous for type lookup in this contextprivate let root: FileSystemNode // 'FileSystemNode' is ambiguous for type lookup in this contextinit(root: FileSystemNode) { // 'FileSystemNode' is ambiguous for type lookup in this contextprivate let root: FileSystemNode // 'FileSystemNode' is ambiguous for type lookup in this contextinit(root: FileSystemNode) { // 'FileSystemNode' is ambiguous for type lookup in this contextclass FileSystemNode { // invalid redeclaration of 'FileSystemNode'private let children: [FileSystemNode] // 'FileSystemNode' is ambiguous for type lookup in this contextinit(name: String, size: Int, children: [FileSystemNode]) { // 'FileSystemNode' is ambiguous for type lookup in this contextreturn self // return expression of type 'FileSystemNode' does not conform to 'FileSystemInfo'return self // return expression of type 'FileSystemLeaf' does not conform to 'FileSystemInfo'private let children: [FileSystemNode] // 'FileSystemNode' is ambiguous for type lookup in this contextinit(name: String, children: [FileSystemNode]) { // 'FileSystemNode' is ambiguous for type lookup in this contextreturn self // return expression of type 'FileSystemDirectory' does not conform to 'FileSystemInfo'XCTAssertEqual(file.totalSize, 100) // value of type 'FileSystemNode' has no member 'totalSize'indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(_, let size):
return size
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file:
return 0
case .directory(_, let contents):
return 1 + contents.max(by: { $0.treeDepth < $1.treeDepth })?.treeDepth ?? 0
}
}
}```swift
indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(_, let size):
return size
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file:
return 0
case .directory(_, let contents):
return 1 + contents.max(by: { $0.treeDepth < $1.treeDepth })?.treeDepth ?? 0
}
}
}
```return 1 + contents.max(by: { $0.treeDepth < $1.treeDepth })?.treeDepth ?? 0 // value of optional type 'Int?' must be unwrapped to a value of type 'Int'indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(_, let size):
return size
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file:
return 0
case .directory(_, let contents):
return 1 + contents.reduce(0) { max($0, $1.treeDepth) }
}
}
}
struct FileSystem {
let root: FileSystemNode
}```swift
indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(_, let size):
return size
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file:
return 0
case .directory(_, let contents):
return 1 + contents.reduce(0) { max($0, $1.treeDepth) }
}
}
}
// Concrete file system implementation.
struct FileSystem {
let root: FileSystemNode
}
let fileSystem = FileSystem(root: .directory(name: "root", contents: [
.file(name: "file1", size: 100),
.file(name: "file2", size: 200),
.directory(name: "subdir", contents: [
.file(name: "file3", size: 300),
.file(name: "file4", size: 400)
])
]))
// File system metadata calculation.
let metadata = fileSystem.root.metadata
print(metadata.totalSize) // 1000
print(metadata.filesCount) // 4
print(metadata.treeDepth) // 3
``` // XCTAssertEqual failed: (3) is not equal to (4)indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(_, let size):
return size
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file:
return 0
case .directory(_, let contents):
return 1 + contents.reduce(0) { $0 > $1.treeDepth ? $0 : $1.treeDepth }
}
}
}
class FileSystemManager {
func createFile(name: String, size: Int) -> FileSystemNode {
return .file(name: name, size: size)
}
func createDirectory(name: String, contents: [FileSystemNode]) -> FileSystemNode {
return .directory(name: name, contents: contents)
}
func calculateMetadata(node: FileSystemNode) -> FileSystemInfo {
return node
}
}```swift
indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(_, let size):
return size
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file:
return 0
case .directory(_, let contents):
return 1 + contents.reduce(0) { $0 > $1.treeDepth ? $0 : $1.treeDepth }
}
}
}
// Concrete file system manager.
// Used to create file system nodes and calculate file system metadata.
class FileSystemManager {
func createFile(name: String, size: Int) -> FileSystemNode {
return .file(name: name, size: size)
}
func createDirectory(name: String, contents: [FileSystemNode]) -> FileSystemNode {
return .directory(name: name, contents: contents)
}
func calculateMetadata(node: FileSystemNode) -> FileSystemInfo {
return node
}
}
// Usage example.
let fileSystemManager = FileSystemManager()
let root = fileSystemManager.createDirectory(name: "Root", contents: [
fileSystemManager.createDirectory(name: "Folder 1", contents: [
fileSystemManager.createFile(name: "File 1", size: 100),
fileSystemManager.createFile(name: "File 2", size: 200)
]),
fileSystemManager.createDirectory(name: "Folder 2", contents: [
fileSystemManager.createFile(name: "File 3", size: 300),
fileSystemManager.createFile(name: "File 4", size: 400)
])
])
let metadata = fileSystemManager.calculateMetadata(node: root)
print(metadata.totalSize) // 1000
print(metadata.filesCount) // 4
print(metadata.treeDepth) // 3
``` // XCTAssertEqual failed: (3) is not equal to (4)indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(_, let size):
return size
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file:
return 0
case .directory(_, let contents):
return 1 + contents.reduce(0) { max($0, $1.treeDepth) }
}
}
}```swift
indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(_, let size):
return size
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file:
return 0
case .directory(_, let contents):
return 1 + contents.reduce(0) { max($0, $1.treeDepth) }
}
}
}
``` // XCTAssertEqual failed: (3) is not equal to (4)protocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
class Stack<T>: StackProtocol {
typealias Element = T
var items = [T]()
required init() {}
func push(_ element: T) {
items.append(element)
}
func pop() -> T? {
return items.popLast()
}
}```swift
protocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
// Generic stack with push and pop functions.
class Stack<T>: StackProtocol {
typealias Element = T
var items = [T]()
required init() {}
func push(_ element: T) {
items.append(element)
}
func pop() -> T? {
return items.popLast()
}
}
// A stack of integers.
let stackOfInts = Stack<Int>()
stackOfInts.push(1)
stackOfInts.push(2)
stackOfInts.push(3)
print(stackOfInts.pop()!) // Prints "3".
print(stackOfInts.pop()!) // Prints "2".
print(stackOfInts.pop()!) // Prints "1".
```var stack = Stack<Int>() // variable 'stack' was never mutated; consider changing to 'let' constantprotocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
class Stack<T>: StackProtocol {
typealias Element = T
var items: [T] = []
required init() {}
func push(_ element: T) {
items.append(element)
}
func pop() -> T? {
return items.popLast()
}
}```swift
protocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
// Generic stack with push and pop functions.
class Stack<T>: StackProtocol {
typealias Element = T
var items: [T] = []
required init() {}
func push(_ element: T) {
items.append(element)
}
func pop() -> T? {
return items.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<T>: StackProtocol {
typealias Element = T
var items: [T] = []
required init() {}
func push(_ element: T) {
items.append(element)
}
func pop() -> T? {
return items.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<T>: StackProtocol {
typealias Element = T
var items: [T] = []
required init() {}
func push(_ element: T) {
items.append(element)
}
func pop() -> T? {
return items.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<T>: StackProtocol {
typealias Element = T
var items: [T] = []
required init() {}
func push(_ element: T) {
items.append(element)
}
func pop() -> T? {
return items.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<T>: StackProtocol {
typealias Element = T
var items: [T] = []
required init() {}
func push(_ element: T) {
items.append(element)
}
func pop() -> T? {
return items.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<T>: StackProtocol {
typealias Element = T
var items: [T] = []
required init() {}
func push(_ element: T) {
items.append(element)
}
func pop() -> T? {
return items.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<T>: StackProtocol {
typealias Element = T
var items: [T] = []
required init() {}
func push(_ element: T) {
items.append(element)
}
func pop() -> T? {
return items.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<T>: StackProtocol {
typealias Element = T
var items: [T] = []
required init() {}
func push(_ element: T) {
items.append(element)
}
func pop() -> T? {
return items.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<T>: StackProtocol {
typealias Element = T
var items: [T] = []
required init() {}
func push(_ element: T) {
items.append(element)
}
func pop() -> T? {
return items.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<T>: StackProtocol {
typealias Element = T
var items: [T] = []
required init() {}
func push(_ element: T) {
items.append(element)
}
func pop() -> T? {
return items.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<T>: StackProtocol {
typealias Element = T
var items: [T] = []
required init() {}
func push(_ element: T) {
items.append(element)
}
func pop() -> T? {
return items.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<T>: StackProtocol {
typealias Element = T
var items: [T] = []
required init() {}
func push(_ element: T) {
items.append(element)
}
func pop() -> T? {
return items.popLast()
var stack = Stack<Int>() // variable 'stack' was never mutated; consider changing to 'let' constantprotocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
class Stack<T>: StackProtocol {
typealias Element = T
var items = [T]()
required init() {}
func push(_ element: T) {
items.append(element)
}
func pop() -> T? {
return items.popLast()
}
}```swift
protocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
// Generic stack with push and pop functions.
class Stack<T>: StackProtocol {
typealias Element = T
var items = [T]()
required init() {}
func push(_ element: T) {
items.append(element)
}
func pop() -> T? {
return items.popLast()
}
}
// Concrete stack of integers.
class IntStack: Stack<Int> {}
// Concrete stack of strings.
class StringStack: Stack<String> {}
// Concrete stack of any type that conforms to the Printable protocol.
class PrintableStack<T: Printable>: Stack<T> {}
// Concrete stack of any type that conforms to the CustomStringConvertible protocol.
class CustomStringConvertibleStack<T: CustomStringConvertible>: Stack<T> {}
```var stack = Stack<Int>() // variable 'stack' was never mutated; consider changing to 'let' constantprotocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
class Stack<T>: StackProtocol {
typealias Element = T
var items: [T] = []
required init() {}
func push(_ element: T) {
items.append(element)
}
func pop() -> T? {
return items.popLast()
}
}
class IntStack: StackProtocol {
typealias Element = Int
var items: [Int] = []
required init() {}
func push(_ element: Int) {
items.append(element)
}
func pop() -> Int? {
return items.popLast()
}
}
class StringStack: StackProtocol {
typealias Element = String
var items: [String] = []
required init() {}
func push(_ element: String) {
items.append(element)
}
func pop() -> String? {
return items.popLast()
}
}
func top<T>(of stack: Stack<T>) -> T? {
return stack.pop()
}
func top(of stack: IntStack) -> Int? {
return stack.pop()
}
func top(of stack: StringStack) -> String? {
return stack.pop()
}```swift
protocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
// Generic stack with push and pop functions.
class Stack<T>: StackProtocol {
typealias Element = T
var items: [T] = []
required init() {}
func push(_ element: T) {
items.append(element)
}
func pop() -> T? {
return items.popLast()
}
}
// Specialized stack for integers.
class IntStack: StackProtocol {
typealias Element = Int
var items: [Int] = []
required init() {}
func push(_ element: Int) {
items.append(element)
}
func pop() -> Int? {
return items.popLast()
}
}
// Specialized stack for strings.
class StringStack: StackProtocol {
typealias Element = String
var items: [String] = []
required init() {}
func push(_ element: String) {
items.append(element)
}
func pop() -> String? {
return items.popLast()
}
}
// Generic function that takes a stack and returns its top element.
func top<T>(of stack: Stack<T>) -> T? {
return stack.pop()
}
// Specialized function for integer stacks.
func top(of stack: IntStack) -> Int? {
return stack.pop()
}
// Specialized function for string stacks.
func top(of stack: StringStack) -> String? {
return stack.pop()
}
// Generic function that takes a stack and returns its top element.
func top<T>(of stack: Stack<T>) -> T? {
return stack.pop()
}
// Specialized function for integer stacks.
func top(of stack: IntStack) -> Int? {
return stack.pop()
}
// Specialized function for string stacks.
func top(of stack: StringStack) -> String? {
return stack.pop()
}
// Generic function that takes a stack and returns its top element.
func top<T>(of stack: Stack<T>) -> T? {
return stack.pop()
}
// Specialized function for integer stacks.
func top(of stack: IntStack) -> Int? {
return stack.pop()
}
// Specialized function for string stacks.
func top(of stack: StringStack) -> String? {
return stack.pop()
}
// Generic function that takes a stack and returns its top element.
func top<T>(of stack: Stack<T>) -> T? {
return stack.pop()
}
// Specialized function for integer stacks.
func top(of stack: IntStack) -> Int? {
return stack.pop()
}
// Specialized function for string stacks.
func top(of stack: StringStack) -> String? {
return stack.pop()
}
// Generic function that takes a stack and returns its top element.
func top<T>(of stack: Stack<T>) -> T? {
return stack.pop()
}
// Specialized function for integer stacks.
func top(of stack: IntStack) -> Int? {
return stack.pop()
}
// Specialized function for string stacks.
func top(of stack: StringStack) -> String? {
return stack.pop()
}
// Generic function that takes a stack and returns its top element.
func top<T>(of stack: Stack<T>) -> T? {
return stack.pop()
}
// Specialized function for integer stacks.
func top(of stack: IntStack) -> Int? {
return stack.pop()
}
// Specialized function for string stacks.
func top(of stack: StringStack) -> String? {
return stack.pop()
}
// Generic function that takes a stack and returns its top element.
func top<T>(of stack: Stack<T>) -> T? {
return stack.pop()
}
// Specialized function for integer stacks.
func top(of stack: IntStack) -> Int? {
return stack.pop()
}
// Specialized function for string stacks.
func top(of stack: StringStack) -> String? {
return stack.pop()
}
// Generic function that takes a stack and returns its top element.
var stack = Stack<Int>() // variable 'stack' was never mutated; consider changing to 'let' constantprotocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
class Stack<T>: StackProtocol {
typealias Element = T
var items = [T]()
required init() {}
func push(_ element: T) {
items.append(element)
}
func pop() -> T? {
return items.popLast()
}
}```swift
protocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
// Generic stack with push and pop functions.
class Stack<T>: StackProtocol {
typealias Element = T
var items = [T]()
required init() {}
func push(_ element: T) {
items.append(element)
}
func pop() -> T? {
return items.popLast()
}
}
// Concrete stack of integers.
class IntStack: Stack<Int> {}
// Concrete stack of strings.
class StringStack: Stack<String> {}
// Concrete stack of characters.
class CharStack: Stack<Character> {}
// Concrete stack of any object.
class AnyStack: Stack<Any> {}
```var stack = Stack<Int>() // variable 'stack' was never mutated; consider changing to 'let' constantprotocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
class Stack<T>: StackProtocol {
typealias Element = T
var items: [T] = []
required init() {}
func push(_ element: T) {
items.append(element)
}
func pop() -> T? {
return items.popLast()
}
}```swift
protocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
// Generic stack with push and pop functions.
class Stack<T>: StackProtocol {
typealias Element = T
var items: [T] = []
required init() {}
func push(_ element: T) {
items.append(element)
}
func pop() -> T? {
return items.popLast()
}
}
// Concrete stack of integers.
class IntStack: Stack<Int> {}
// Concrete stack of strings.
class StringStack: Stack<String> {}
// Concrete stack of any type that conforms to the Printable protocol.
class PrintableStack<T: Printable>: Stack<T> {}
// Concrete stack of any type that conforms to the Equatable protocol.
class EquatableStack<T: Equatable>: Stack<T> {}
```var stack = Stack<Int>() // variable 'stack' was never mutated; consider changing to 'let' constantprotocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
class Stack<T>: StackProtocol {
typealias Element = T
var items = [T]()
required init() {}
func push(_ element: T) {
items.append(element)
}
func pop() -> T? {
return items.popLast()
}
}```swift
protocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
// Generic stack with push and pop functions.
class Stack<T>: StackProtocol {
typealias Element = T
var items = [T]()
required init() {}
func push(_ element: T) {
items.append(element)
}
func pop() -> T? {
return items.popLast()
}
}
// A stack of integers.
let stackOfInts = Stack<Int>()
stackOfInts.push(1)
stackOfInts.push(2)
stackOfInts.push(3)
print(stackOfInts.pop()!) // Prints "3".
print(stackOfInts.pop()!) // Prints "2".
print(stackOfInts.pop()!) // Prints "1".
```var stack = Stack<Int>() // variable 'stack' was never mutated; consider changing to 'let' constantprotocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
class Stack<T>: StackProtocol {
typealias Element = T
var items = [T]()
required init() {}
func push(_ element: T) {
items.append(element)
}
func pop() -> T? {
return items.popLast()
}
}
class IntStack: StackProtocol {
typealias Element = Int
var items = [Int]()
required init() {}
func push(_ element: Int) {
items.append(element)
}
func pop() -> Int? {
return items.popLast()
}
}
class StringStack: StackProtocol {
typealias Element = String
var items = [String]()
required init() {}
func push(_ element: String) {
items.append(element)
}
func pop() -> String? {
return items.popLast()
}
}
class CharacterStack: StackProtocol {
typealias Element = Character
var items = [Character]()
required init() {}
func push(_ element: Character) {
items.append(element)
}
func pop() -> Character? {
return items.popLast()
}
}
class DoubleStack: StackProtocol {
typealias Element = Double
var items = [Double]()
required init() {}
func push(_ element: Double) {
items.append(element)
}
func pop() -> Double? {
return items.popLast()
}
}
class BoolStack: StackProtocol {
typealias Element = Bool
var items = [Bool]()
required init() {}
func push(_ element: Bool) {
items.append(element)
}
func pop() -> Bool? {
return items.popLast()
}
}```swift
protocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
// Generic stack with push and pop functions.
class Stack<T>: StackProtocol {
typealias Element = T
var items = [T]()
required init() {}
func push(_ element: T) {
items.append(element)
}
func pop() -> T? {
return items.popLast()
}
}
// Specialized stack for integers.
class IntStack: StackProtocol {
typealias Element = Int
var items = [Int]()
required init() {}
func push(_ element: Int) {
items.append(element)
}
func pop() -> Int? {
return items.popLast()
}
}
// Specialized stack for strings.
class StringStack: StackProtocol {
typealias Element = String
var items = [String]()
required init() {}
func push(_ element: String) {
items.append(element)
}
func pop() -> String? {
return items.popLast()
}
}
// Specialized stack for characters.
class CharacterStack: StackProtocol {
typealias Element = Character
var items = [Character]()
required init() {}
func push(_ element: Character) {
items.append(element)
}
func pop() -> Character? {
return items.popLast()
}
}
// Specialized stack for doubles.
class DoubleStack: StackProtocol {
typealias Element = Double
var items = [Double]()
required init() {}
func push(_ element: Double) {
items.append(element)
}
func pop() -> Double? {
return items.popLast()
}
}
// Specialized stack for booleans.
class BoolStack: StackProtocol {
typealias Element = Bool
var items = [Bool]()
required init() {}
func push(_ element: Bool) {
items.append(element)
}
func pop() -> Bool? {
return items.popLast()
}
}
```var stack = Stack<Int>() // variable 'stack' was never mutated; consider changing to 'let' constantprotocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
class Stack<T>: StackProtocol {
typealias Element = T
var items = [T]()
required init() {}
func push(_ element: T) {
items.append(element)
}
func pop() -> T? {
return items.popLast()
}
}
class MyStack: StackProtocol {
typealias Element = Int
var items = [Int]()
required init() {}
func push(_ element: Int) {
items.append(element)
}
func pop() -> Int? {
return items.popLast()
}
}
class MyStack2: StackProtocol {
typealias Element = Int
var items = [Int]()
required init() {}
func push(_ element: Int) {
items.append(element)
}
func pop() -> Int? {
return items.popLast()
}
}
class MyStack3: StackProtocol {
typealias Element = Int
var items = [Int]()
required init() {}
func push(_ element: Int) {
items.append(element)
}
func pop() -> Int? {
return items.popLast()
}
}
class MyStack4: StackProtocol {
typealias Element = Int
var items = [Int]()
required init() {}
func push(_ element: Int) {
items.append(element)
}
func pop() -> Int? {
return items.popLast()
}
}
class MyStack5: StackProtocol {
typealias Element = Int
var items = [Int]()
required init() {}
func push(_ element: Int) {
items.append(element)
}
func pop() -> Int? {
return items.popLast()
}
}
class MyStack6: StackProtocol {
typealias Element = Int
var items = [Int]()
required init() {}
func push(_ element: Int) {
items.append(element)
}
func pop() -> Int? {
return items.popLast()
}
}
class MyStack7: StackProtocol {
typealias Element = Int
var items = [Int]()
required init() {}
func push(_ element: Int) {
items.append(element)
}
func pop() -> Int? {
return items.popLast()
}
}
class MyStack8: StackProtocol {
typealias Element = Int
var items = [Int]()
required init() {}
func push(_ element: Int) {
items.append(element)
}
func pop() -> Int? {
return items.popLast()
}
}
class MyStack9: StackProtocol {
typealias Element = Int
var items = [Int]()
required init() {}
func push(_ element: Int) {
items.append(element)
}
func pop() -> Int? {
return items.popLast()
}
}
class MyStack10: StackProtocol {
typealias Element = Int
var items = [Int]()
required init() {}
func push(_ element: Int) {
items.append(element)
}
func pop() -> Int? {
return items.popLast()
}
}
class MyStack11: StackProtocol {
typealias Element = Int
var items = [Int]()
required init() {}
func push(_ element: Int) {
items.append(element)
}
func pop() -> Int? {
return items.popLast()
}
}```swift
protocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
// Generic stack with push and pop functions.
class Stack<T>: StackProtocol {
typealias Element = T
var items = [T]()
required init() {}
func push(_ element: T) {
items.append(element)
}
func pop() -> T? {
return items.popLast()
}
}
// Concrete stack with a custom type.
class MyStack: StackProtocol {
typealias Element = Int
var items = [Int]()
required init() {}
func push(_ element: Int) {
items.append(element)
}
func pop() -> Int? {
return items.popLast()
}
}
// Concrete stack with a custom type.
class MyStack2: StackProtocol {
typealias Element = Int
var items = [Int]()
required init() {}
func push(_ element: Int) {
items.append(element)
}
func pop() -> Int? {
return items.popLast()
}
}
// Concrete stack with a custom type.
class MyStack3: StackProtocol {
typealias Element = Int
var items = [Int]()
required init() {}
func push(_ element: Int) {
items.append(element)
}
func pop() -> Int? {
return items.popLast()
}
}
// Concrete stack with a custom type.
class MyStack4: StackProtocol {
typealias Element = Int
var items = [Int]()
required init() {}
func push(_ element: Int) {
items.append(element)
}
func pop() -> Int? {
return items.popLast()
}
}
// Concrete stack with a custom type.
class MyStack5: StackProtocol {
typealias Element = Int
var items = [Int]()
required init() {}
func push(_ element: Int) {
items.append(element)
}
func pop() -> Int? {
return items.popLast()
}
}
// Concrete stack with a custom type.
class MyStack6: StackProtocol {
typealias Element = Int
var items = [Int]()
required init() {}
func push(_ element: Int) {
items.append(element)
}
func pop() -> Int? {
return items.popLast()
}
}
// Concrete stack with a custom type.
class MyStack7: StackProtocol {
typealias Element = Int
var items = [Int]()
required init() {}
func push(_ element: Int) {
items.append(element)
}
func pop() -> Int? {
return items.popLast()
}
}
// Concrete stack with a custom type.
class MyStack8: StackProtocol {
typealias Element = Int
var items = [Int]()
required init() {}
func push(_ element: Int) {
items.append(element)
}
func pop() -> Int? {
return items.popLast()
}
}
// Concrete stack with a custom type.
class MyStack9: StackProtocol {
typealias Element = Int
var items = [Int]()
required init() {}
func push(_ element: Int) {
items.append(element)
}
func pop() -> Int? {
return items.popLast()
}
}
// Concrete stack with a custom type.
class MyStack10: StackProtocol {
typealias Element = Int
var items = [Int]()
required init() {}
func push(_ element: Int) {
items.append(element)
}
func pop() -> Int? {
return items.popLast()
}
}
// Concrete stack with a custom type.
class MyStack11: StackProtocol {
typealias Element = Int
var items = [Int]()
required init() {}
func push(_ element: Int) {
items.append(element)
}
func pop() -> Int? {
return items.popLast()
}
}
// Concrete stack with a custom type.
class MyStack12:var stack = Stack<Int>() // variable 'stack' was never mutated; consider changing to 'let' constantprotocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
class Stack<T>: StackProtocol {
typealias Element = T
var items = [T]()
required init() {}
func push(_ element: T) {
items.append(element)
}
func pop() -> T? {
return items.popLast()
}
}```swift
protocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
// Generic stack with push and pop functions.
class Stack<T>: StackProtocol {
typealias Element = T
var items = [T]()
required init() {}
func push(_ element: T) {
items.append(element)
}
func pop() -> T? {
return items.popLast()
}
}
// A stack of integers.
let stackOfInts = Stack<Int>()
stackOfInts.push(1)
stackOfInts.push(2)
stackOfInts.push(3)
print(stackOfInts.pop()!) // Prints "3".
print(stackOfInts.pop()!) // Prints "2".
print(stackOfInts.pop()!) // Prints "1".
```var stack = Stack<Int>() // variable 'stack' was never mutated; consider changing to 'let' constantprotocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
class Cache<Key: Hashable, Element>: CacheProtocol {
private var storage: [Key: Element]
private var order: [Key]
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
self.storage = [Key: Element]()
self.order = [Key]()
}
subscript(key: Key) -> Element? {
get {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
order.append(key)
return storage[key]
}
return nil
}
set {
if let newValue = newValue {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
}
order.append(key)
storage[key] = newValue
if storage.count > capacity {
let removedKey = order.removeFirst()
storage.removeValue(forKey: removedKey)
}
} else {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
storage.removeValue(forKey: key)
}
}
}
}
}```swift
protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
// Generic in-memory cache that follows to the LRU (Least Recently Used) eviction policy.
// The cache should have a specified capacity limit, and when this limit is reached, it should remove the least recently used item to make space for new entries.
class Cache<Key: Hashable, Element>: CacheProtocol {
private var storage: [Key: Element]
private var order: [Key]
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
self.storage = [Key: Element]()
self.order = [Key]()
}
subscript(key: Key) -> Element? {
get {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
order.append(key)
return storage[key]
}
return nil
}
set {
if let newValue = newValue {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
}
order.append(key)
storage[key] = newValue
if storage.count > capacity {
let removedKey = order.removeFirst()
storage.removeValue(forKey: removedKey)
}
} else {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
storage.removeValue(forKey: key)
}
}
}
}
}
// Tests
let cache = Cache<String, Int>(capacity: 2)
cache["a"] = 1
cache["b"] = 2
cache["c"] = 3
cache["d"] = 4
print(cache["a"]) // 1
print(cache["b"]) // 2
print(cache["c"]) // 3
print(cache["d"]) // 4
cache["a"] = nil
cache["b"] = nil
print(cache["a"]) // nil
print(cache["b"]) // nil
print(cache["c"]) // 3
print(cache["d"]) // 4
cache["e"] = 5
cache["f"] = 6
print(cache["c"]) // nil
print(cache["d"]) // 4
print(cache["e"]) // 5
print(cache["f"]) // 6
```init(capacity: Int) { // initializer requirement 'init(capacity:)' can only be satisfied by a 'required' initializer in non-final class 'Cache<Key, Element>'protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
class Cache<Key: Hashable, Element>: CacheProtocol {
private var storage: [Key: Element]
private var order: [Key]
private var capacity: Int
init(capacity: Int) {
self.capacity = capacity
self.storage = [Key: Element]()
self.order = [Key]()
}
subscript(key: Key) -> Element? {
get {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
order.append(key)
return storage[key]
}
return nil
}
set {
if let value = newValue {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
}
order.append(key)
storage[key] = value
while storage.count > capacity {
let removedKey = order.removeFirst()
storage.removeValue(forKey: removedKey)
}
} else {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
storage.removeValue(forKey: key)
}
}
}
}
}
class LRUCache<Key: Hashable, Element>: CacheProtocol {
private var storage: [Key: Element]
private var order: [Key]
private var capacity: Int
init(capacity: Int) {
self.capacity = capacity
self.storage = [Key: Element]()
self.order = [Key]()
}
subscript(key: Key) -> Element? {
get {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
order.append(key)
return storage[key]
}
return nil
}
set {
if let value = newValue {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
}
order.append(key)
storage[key] = value
while storage.count > capacity {
let removedKey = order.removeFirst()
storage.removeValue(forKey: removedKey)
}
} else {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
storage.removeValue(forKey: key)
}
}
}
}
}```swift
protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
// Generic in-memory cache that follows to the LRU (Least Recently Used) eviction policy.
// The cache should have a specified capacity limit, and when this limit is reached, it should remove the least recently used item to make space for new entries.
class Cache<Key: Hashable, Element>: CacheProtocol {
private var storage: [Key: Element]
private var order: [Key]
private var capacity: Int
init(capacity: Int) {
self.capacity = capacity
self.storage = [Key: Element]()
self.order = [Key]()
}
subscript(key: Key) -> Element? {
get {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
order.append(key)
return storage[key]
}
return nil
}
set {
if let value = newValue {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
}
order.append(key)
storage[key] = value
while storage.count > capacity {
let removedKey = order.removeFirst()
storage.removeValue(forKey: removedKey)
}
} else {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
storage.removeValue(forKey: key)
}
}
}
}
}
// A cache that stores the most recently used items in memory.
// The cache should have a specified capacity limit, and when this limit is reached, it should remove the least recently used item to make space for new entries.
class LRUCache<Key: Hashable, Element>: CacheProtocol {
private var storage: [Key: Element]
private var order: [Key]
private var capacity: Int
init(capacity: Int) {
self.capacity = capacity
self.storage = [Key: Element]()
self.order = [Key]()
}
subscript(key: Key) -> Element? {
get {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
order.append(key)
return storage[key]
}
return nil
}
set {
if let value = newValue {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
}
order.append(key)
storage[key] = value
while storage.count > capacity {
let removedKey = order.removeFirst()
storage.removeValue(forKey: removedKey)
}
} else {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
storage.removeValue(forKey: key)
}
}
}
}
}
```init(capacity: Int) { // initializer requirement 'init(capacity:)' can only be satisfied by a 'required' initializer in non-final class 'Cache<Key, Element>'init(capacity: Int) { // initializer requirement 'init(capacity:)' can only be satisfied by a 'required' initializer in non-final class 'LRUCache<Key, Element>'protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
class Cache<Key: Hashable, Element>: CacheProtocol {
private var cache: [Key: Element]
private var order: [Key]
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
self.cache = [:]
self.order = []
}
subscript(key: Key) -> Element? {
get {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
order.append(key)
return cache[key]
}
return nil
}
set {
if let newValue = newValue {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
}
order.append(key)
cache[key] = newValue
if order.count > capacity {
let removedKey = order.removeFirst()
cache.removeValue(forKey: removedKey)
}
} else {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
cache.removeValue(forKey: key)
}
}
}
}
}```swift
protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
// Generic in-memory cache that follows to the LRU (Least Recently Used) eviction policy.
// The cache should have a specified capacity limit, and when this limit is reached, it should remove the least recently used item to make space for new entries.
class Cache<Key: Hashable, Element>: CacheProtocol {
private var cache: [Key: Element]
private var order: [Key]
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
self.cache = [:]
self.order = []
}
subscript(key: Key) -> Element? {
get {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
order.append(key)
return cache[key]
}
return nil
}
set {
if let newValue = newValue {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
}
order.append(key)
cache[key] = newValue
if order.count > capacity {
let removedKey = order.removeFirst()
cache.removeValue(forKey: removedKey)
}
} else {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
cache.removeValue(forKey: key)
}
}
}
}
}
```init(capacity: Int) { // initializer requirement 'init(capacity:)' can only be satisfied by a 'required' initializer in non-final class 'Cache<Key, Element>'protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
class Cache<Key: Hashable, Element>: CacheProtocol {
private var cache: [Key: Element]
private var order: [Key]
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
self.cache = [:]
self.order = []
}
subscript(key: Key) -> Element? {
get {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
order.append(key)
return cache[key]
}
return nil
}
set {
if let newValue = newValue {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
}
order.append(key)
cache[key] = newValue
if cache.count > capacity {
let removedKey = order.removeFirst()
cache.removeValue(forKey: removedKey)
}
} else {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
cache.removeValue(forKey: key)
}
}
}
}
}```swift
protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
// Generic in-memory cache that follows to the LRU (Least Recently Used) eviction policy.
// The cache should have a specified capacity limit, and when this limit is reached, it should remove the least recently used item to make space for new entries.
class Cache<Key: Hashable, Element>: CacheProtocol {
private var cache: [Key: Element]
private var order: [Key]
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
self.cache = [:]
self.order = []
}
subscript(key: Key) -> Element? {
get {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
order.append(key)
return cache[key]
}
return nil
}
set {
if let newValue = newValue {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
}
order.append(key)
cache[key] = newValue
if cache.count > capacity {
let removedKey = order.removeFirst()
cache.removeValue(forKey: removedKey)
}
} else {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
cache.removeValue(forKey: key)
}
}
}
}
}
// Usage
let cache = Cache<String, Int>(capacity: 3)
cache["a"] = 1
cache["b"] = 2
cache["c"] = 3
cache["d"] = 4
cache["e"] = 5
cache["f"] = 6
print(cache["a"]) // 1
print(cache["b"]) // 2
print(cache["c"]) // 3
print(cache["d"]) // 4
print(cache["e"]) // 5
print(cache["f"]) // 6
print(cache["g"]) // nil
```init(capacity: Int) { // initializer requirement 'init(capacity:)' can only be satisfied by a 'required' initializer in non-final class 'Cache<Key, Element>'protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
class Cache<Key: Hashable, Element>: CacheProtocol {
private var cache: [Key: Element]
private var order: [Key]
private let capacity: Int
init(capacity: Int) {
self.cache = [:]
self.order = []
self.capacity = capacity
}
subscript(key: Key) -> Element? {
get {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
order.append(key)
return cache[key]
}
return nil
}
set {
if let newValue = newValue {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
}
order.append(key)
cache[key] = newValue
if order.count > capacity {
let removedKey = order.removeFirst()
cache.removeValue(forKey: removedKey)
}
} else {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
cache.removeValue(forKey: key)
}
}
}
}
}```swift
protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
// Generic in-memory cache that follows to the LRU (Least Recently Used) eviction policy.
// The cache should have a specified capacity limit, and when this limit is reached, it should remove the least recently used item to make space for new entries.
class Cache<Key: Hashable, Element>: CacheProtocol {
private var cache: [Key: Element]
private var order: [Key]
private let capacity: Int
init(capacity: Int) {
self.cache = [:]
self.order = []
self.capacity = capacity
}
subscript(key: Key) -> Element? {
get {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
order.append(key)
return cache[key]
}
return nil
}
set {
if let newValue = newValue {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
}
order.append(key)
cache[key] = newValue
if order.count > capacity {
let removedKey = order.removeFirst()
cache.removeValue(forKey: removedKey)
}
} else {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
cache.removeValue(forKey: key)
}
}
}
}
}
// Tests
let cache = Cache<String, Int>(capacity: 3)
cache["a"] = 1
cache["b"] = 2
cache["c"] = 3
cache["d"] = 4
cache["e"] = 5
print(cache["a"]) // 1
print(cache["b"]) // 2
print(cache["c"]) // 3
print(cache["d"]) // 4
print(cache["e"]) // 5
cache["b"] = nil
cache["c"] = nil
cache["d"] = nil
print(cache["a"]) // 1
print(cache["b"]) // nil
print(cache["c"]) // nil
print(cache["d"]) // nil
print(cache["e"]) // 5
```init(capacity: Int) { // initializer requirement 'init(capacity:)' can only be satisfied by a 'required' initializer in non-final class 'Cache<Key, Element>'protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
class Cache<Key: Hashable, Element>: CacheProtocol {
private var cache: [Key: Element]
private var order: [Key]
private var capacity: Int
init(capacity: Int) {
self.cache = [Key: Element]()
self.order = [Key]()
self.capacity = capacity
}
subscript(key: Key) -> Element? {
get {
guard let index = order.firstIndex(of: key) else {
return nil
}
order.remove(at: index)
order.append(key)
return cache[key]
}
set {
if let value = newValue {
cache[key] = value
order.append(key)
if order.count > capacity {
let removedKey = order.removeFirst()
cache.removeValue(forKey: removedKey)
}
} else {
cache.removeValue(forKey: key)
if let index = order.firstIndex(of: key) {
order.remove(at: index)
}
}
}
}
}```swift
protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
// Generic in-memory cache that follows to the LRU (Least Recently Used) eviction policy.
// The cache should have a specified capacity limit, and when this limit is reached, it should remove the least recently used item to make space for new entries.
class Cache<Key: Hashable, Element>: CacheProtocol {
private var cache: [Key: Element]
private var order: [Key]
private var capacity: Int
init(capacity: Int) {
self.cache = [Key: Element]()
self.order = [Key]()
self.capacity = capacity
}
subscript(key: Key) -> Element? {
get {
guard let index = order.firstIndex(of: key) else {
return nil
}
order.remove(at: index)
order.append(key)
return cache[key]
}
set {
if let value = newValue {
cache[key] = value
order.append(key)
if order.count > capacity {
let removedKey = order.removeFirst()
cache.removeValue(forKey: removedKey)
}
} else {
cache.removeValue(forKey: key)
if let index = order.firstIndex(of: key) {
order.remove(at: index)
}
}
}
}
}
```init(capacity: Int) { // initializer requirement 'init(capacity:)' can only be satisfied by a 'required' initializer in non-final class 'Cache<Key, Element>'protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
class Cache<Key: Hashable, Element>: CacheProtocol {
private var storage: [Key: Element]
private var order: [Key]
private var capacity: Int
init(capacity: Int) {
self.storage = [Key: Element]()
self.order = [Key]()
self.capacity = capacity
}
subscript(key: Key) -> Element? {
get {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
order.append(key)
return storage[key]
}
return nil
}
set {
if let newValue = newValue {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
}
order.append(key)
storage[key] = newValue
if storage.count > capacity {
let removedKey = order.removeFirst()
storage.removeValue(forKey: removedKey)
}
} else {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
storage.removeValue(forKey: key)
}
}
}
}
}```swift
protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
// Generic in-memory cache that follows to the LRU (Least Recently Used) eviction policy.
// The cache should have a specified capacity limit, and when this limit is reached, it should remove the least recently used item to make space for new entries.
class Cache<Key: Hashable, Element>: CacheProtocol {
private var storage: [Key: Element]
private var order: [Key]
private var capacity: Int
init(capacity: Int) {
self.storage = [Key: Element]()
self.order = [Key]()
self.capacity = capacity
}
subscript(key: Key) -> Element? {
get {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
order.append(key)
return storage[key]
}
return nil
}
set {
if let newValue = newValue {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
}
order.append(key)
storage[key] = newValue
if storage.count > capacity {
let removedKey = order.removeFirst()
storage.removeValue(forKey: removedKey)
}
} else {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
storage.removeValue(forKey: key)
}
}
}
}
}
// Tests
let cache = Cache<String, Int>(capacity: 2)
cache["a"] = 1
cache["b"] = 2
cache["c"] = 3
print(cache["a"]) // 1
print(cache["b"]) // 2
print(cache["c"]) // 3
cache["d"] = 4
print(cache["a"]) // nil
print(cache["b"]) // 2
print(cache["c"]) // 3
print(cache["d"]) // 4
cache["b"] = nil
print(cache["a"]) // nil
print(cache["b"]) // nil
print(cache["c"]) // 3
print(cache["d"]) // 4
cache["a"] = 5
print(cache["a"]) // 5
print(cache["b"]) // nil
print(cache["c"]) // 3
print(cache["d"]) // 4
```init(capacity: Int) { // initializer requirement 'init(capacity:)' can only be satisfied by a 'required' initializer in non-final class 'Cache<Key, Element>'protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
class Cache<Key: Hashable, Element>: CacheProtocol {
private var cache: [Key: Element]
private var order: [Key]
private var capacity: Int
init(capacity: Int) {
self.capacity = capacity
self.cache = [Key: Element]()
self.order = [Key]()
}
subscript(key: Key) -> Element? {
get {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
order.append(key)
return cache[key]
}
return nil
}
set {
if let newValue = newValue {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
}
order.append(key)
cache[key] = newValue
if order.count > capacity {
let removedKey = order.removeFirst()
cache.removeValue(forKey: removedKey)
}
} else {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
cache.removeValue(forKey: key)
}
}
}
}
}```swift
protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
// Generic in-memory cache that follows to the LRU (Least Recently Used) eviction policy.
// The cache should have a specified capacity limit, and when this limit is reached, it should remove the least recently used item to make space for new entries.
class Cache<Key: Hashable, Element>: CacheProtocol {
private var cache: [Key: Element]
private var order: [Key]
private var capacity: Int
init(capacity: Int) {
self.capacity = capacity
self.cache = [Key: Element]()
self.order = [Key]()
}
subscript(key: Key) -> Element? {
get {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
order.append(key)
return cache[key]
}
return nil
}
set {
if let newValue = newValue {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
}
order.append(key)
cache[key] = newValue
if order.count > capacity {
let removedKey = order.removeFirst()
cache.removeValue(forKey: removedKey)
}
} else {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
cache.removeValue(forKey: key)
}
}
}
}
}
// Usage
let cache = Cache<String, Int>(capacity: 3)
cache["a"] = 1
cache["b"] = 2
cache["c"] = 3
cache["d"] = 4
cache["e"] = 5
print(cache["a"]) // 1
print(cache["b"]) // 2
print(cache["c"]) // 3
print(cache["d"]) // 4
print(cache["e"]) // 5
print(cache["f"]) // nil
print(cache["a"]) // 1
print(cache["b"]) // 2
print(cache["c"]) // 3
print(cache["d"]) // 4
print(cache["e"]) // 5
print(cache["f"]) // nil
```init(capacity: Int) { // initializer requirement 'init(capacity:)' can only be satisfied by a 'required' initializer in non-final class 'Cache<Key, Element>'protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
class Cache<Key: Hashable, Element>: CacheProtocol {
private var cache: [Key: Element]
private var order: [Key]
private var capacity: Int
init(capacity: Int) {
self.capacity = capacity
self.cache = [:]
self.order = []
}
subscript(key: Key) -> Element? {
get {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
order.append(key)
return cache[key]
}
return nil
}
set {
if let newValue = newValue {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
}
order.append(key)
cache[key] = newValue
while cache.count > capacity {
let removedKey = order.remove(at: 0)
cache.removeValue(forKey: removedKey)
}
} else {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
cache.removeValue(forKey: key)
}
}
}
}
}```swift
protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
// Generic in-memory cache that follows to the LRU (Least Recently Used) eviction policy.
// The cache should have a specified capacity limit, and when this limit is reached, it should remove the least recently used item to make space for new entries.
class Cache<Key: Hashable, Element>: CacheProtocol {
private var cache: [Key: Element]
private var order: [Key]
private var capacity: Int
init(capacity: Int) {
self.capacity = capacity
self.cache = [:]
self.order = []
}
subscript(key: Key) -> Element? {
get {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
order.append(key)
return cache[key]
}
return nil
}
set {
if let newValue = newValue {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
}
order.append(key)
cache[key] = newValue
while cache.count > capacity {
let removedKey = order.remove(at: 0)
cache.removeValue(forKey: removedKey)
}
} else {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
cache.removeValue(forKey: key)
}
}
}
}
}
```init(capacity: Int) { // initializer requirement 'init(capacity:)' can only be satisfied by a 'required' initializer in non-final class 'Cache<Key, Element>'protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
class Cache<Key: Hashable, Element>: CacheProtocol {
private var cache: [Key: Element]
private var order: [Key]
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
self.cache = [:]
self.order = []
}
subscript(key: Key) -> Element? {
get {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
order.append(key)
return cache[key]
}
return nil
}
set {
if let newValue = newValue {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
}
order.append(key)
cache[key] = newValue
if order.count > capacity {
let removedKey = order.removeFirst()
cache.removeValue(forKey: removedKey)
}
} else {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
cache.removeValue(forKey: key)
}
}
}
}
}
class RecentItemsCache<Key: Hashable, Element>: CacheProtocol {
private var cache: [Key: Element]
private var order: [Key]
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
self.cache = [:]
self.order = []
}
subscript(key: Key) -> Element? {
get {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
order.append(key)
return cache[key]
}
return nil
}
set {
if let newValue = newValue {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
}
order.append(key)
cache[key] = newValue
if order.count > capacity {
let removedKey = order.removeFirst()
cache.removeValue(forKey: removedKey)
}
} else {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
cache.removeValue(forKey: key)
}
}
}
}
}
class LeastRecentlyUsedCache<Key: Hashable, Element>: CacheProtocol {
private var cache: [Key: Element]
private var order: [Key]
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
self.cache = [:]
self.order = []
}
subscript(key: Key) -> Element? {
get {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
order.append(key)
return cache[key]
}
return nil
}
set {
if let newValue = newValue {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
}
order.append(key)
cache[key] = newValue
if order.count > capacity {
let removedKey = order.removeFirst()
cache.removeValue(forKey: removedKey)
}
} else {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
cache.removeValue(forKey: key)
}
}
}
}
}```swift
protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
// Generic in-memory cache that follows to the LRU (Least Recently Used) eviction policy.
// The cache should have a specified capacity limit, and when this limit is reached, it should remove the least recently used item to make space for new entries.
class Cache<Key: Hashable, Element>: CacheProtocol {
private var cache: [Key: Element]
private var order: [Key]
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
self.cache = [:]
self.order = []
}
subscript(key: Key) -> Element? {
get {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
order.append(key)
return cache[key]
}
return nil
}
set {
if let newValue = newValue {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
}
order.append(key)
cache[key] = newValue
if order.count > capacity {
let removedKey = order.removeFirst()
cache.removeValue(forKey: removedKey)
}
} else {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
cache.removeValue(forKey: key)
}
}
}
}
}
// A cache that stores the most recently used items in memory.
// The cache should have a specified capacity limit, and when this limit is reached, it should remove the least recently used item to make space for new entries.
class RecentItemsCache<Key: Hashable, Element>: CacheProtocol {
private var cache: [Key: Element]
private var order: [Key]
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
self.cache = [:]
self.order = []
}
subscript(key: Key) -> Element? {
get {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
order.append(key)
return cache[key]
}
return nil
}
set {
if let newValue = newValue {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
}
order.append(key)
cache[key] = newValue
if order.count > capacity {
let removedKey = order.removeFirst()
cache.removeValue(forKey: removedKey)
}
} else {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
cache.removeValue(forKey: key)
}
}
}
}
}
// A cache that stores the least recently used items in memory.
// The cache should have a specified capacity limit, and when this limit is reached, it should remove the least recently used item to make space for new entries.
class LeastRecentlyUsedCache<Key: Hashable, Element>: CacheProtocol {
private var cache: [Key: Element]
private var order: [Key]
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
self.cache = [:]
self.order = []
}
subscript(key: Key) -> Element? {
get {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
order.append(key)
return cache[key]
}
return nil
}
set {
if let newValue = newValue {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
}
order.append(key)
cache[key] = newValue
if order.count > capacity {
let removedKey = order.removeFirst()
cache.removeValue(forKey: removedKey)
}
} else {
if let index = order.firstIndex(of: key) {
order.remove(at: index)
cache.removeValue(forKey: key)
}
}
}
}
}
// A cache that stores the mostinit(capacity: Int) { // initializer requirement 'init(capacity:)' can only be satisfied by a 'required' initializer in non-final class 'Cache<Key, Element>'init(capacity: Int) { // initializer requirement 'init(capacity:)' can only be satisfied by a 'required' initializer in non-final class 'RecentItemsCache<Key, Element>'init(capacity: Int) { // initializer requirement 'init(capacity:)' can only be satisfied by a 'required' initializer in non-final class 'LeastRecentlyUsedCache<Key, Element>'protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache: [Key: (value: Value, expiration: TimeInterval)] = [:]
private var expirationQueue: [Key: DispatchTime] = [:]
private let queue = DispatchQueue(label: "com.expirablecache.queue", attributes: .concurrent)
func put(value: Value, key: Key, expiration: TimeInterval) {
queue.async(flags: .barrier) {
self.cache[key] = (value, expiration)
self.expirationQueue[key] = DispatchTime.now() + expiration
}
}
func get(key: Key) -> Value? {
queue.sync {
guard let (value, expiration) = cache[key] else { return nil }
if expiration > DispatchTime.now().uptimeNanoseconds {
return value
} else {
cache.removeValue(forKey: key)
expirationQueue.removeValue(forKey: key)
return nil
}
}
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
if let value = newValue {
put(value: value, key: key, expiration: 60 * 60)
} else {
remove(key: key)
}
}
}
func remove(key: Key) {
queue.async(flags: .barrier) {
self.cache.removeValue(forKey: key)
self.expirationQueue.removeValue(forKey: key)
}
}
}```swift
protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
// Caching mechanism with expiration eviction policy.
// Subscript methods used for convenient access.
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache: [Key: (value: Value, expiration: TimeInterval)] = [:]
private var expirationQueue: [Key: DispatchTime] = [:]
private let queue = DispatchQueue(label: "com.expirablecache.queue", attributes: .concurrent)
func put(value: Value, key: Key, expiration: TimeInterval) {
queue.async(flags: .barrier) {
self.cache[key] = (value, expiration)
self.expirationQueue[key] = DispatchTime.now() + expiration
}
}
func get(key: Key) -> Value? {
queue.sync {
guard let (value, expiration) = cache[key] else { return nil }
if expiration > DispatchTime.now().uptimeNanoseconds {
return value
} else {
cache.removeValue(forKey: key)
expirationQueue.removeValue(forKey: key)
return nil
}
}
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
if let value = newValue {
put(value: value, key: key, expiration: 60 * 60)
} else {
remove(key: key)
}
}
}
func remove(key: Key) {
queue.async(flags: .barrier) {
self.cache.removeValue(forKey: key)
self.expirationQueue.removeValue(forKey: key)
}
}
}
```guard let (value, expiration) = cache[key] else { return nil } // 'nil' is not compatible with closure result type 'Value'Thread.sleep(forTimeInterval: 1.1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6Thread.sleep(forTimeInterval: 0.9) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache: [Key: (value: Value, expiration: TimeInterval)] = [:]
private var timer: Timer?
init() {
timer = Timer.scheduledTimer(withTimeInterval: 1, repeats: true) { [weak self] _ in
self?.removeExpired()
}
}
deinit {
timer?.invalidate()
}
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = (value, expiration + Date().timeIntervalSince1970)
}
func get(key: Key) -> Value? {
guard let (value, expiration) = cache[key] else { return nil }
if expiration > Date().timeIntervalSince1970 {
return value
} else {
cache.removeValue(forKey: key)
return nil
}
}
private func removeExpired() {
let now = Date().timeIntervalSince1970
cache.removeAll { $0.value.expiration < now }
}
}```swift
protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
// Caching mechanism with expiration eviction policy.
// Subscript methods used for convenient access.
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache: [Key: (value: Value, expiration: TimeInterval)] = [:]
private var timer: Timer?
init() {
timer = Timer.scheduledTimer(withTimeInterval: 1, repeats: true) { [weak self] _ in
self?.removeExpired()
}
}
deinit {
timer?.invalidate()
}
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = (value, expiration + Date().timeIntervalSince1970)
}
func get(key: Key) -> Value? {
guard let (value, expiration) = cache[key] else { return nil }
if expiration > Date().timeIntervalSince1970 {
return value
} else {
cache.removeValue(forKey: key)
return nil
}
}
private func removeExpired() {
let now = Date().timeIntervalSince1970
cache.removeAll { $0.value.expiration < now }
}
}
// Usage
let cache = ExpirableCache<String, Int>()
cache["a"] = 1
cache["b"] = 2
cache["c"] = 3
print(cache["a"]) // 1
print(cache["b"]) // 2
print(cache["c"]) // 3
// Wait for 2 seconds
sleep(2)
print(cache["a"]) // nil
print(cache["b"]) // 2
print(cache["c"]) // 3
```cache.removeAll { $0.value.expiration < now } // extra trailing closure passed in callThread.sleep(forTimeInterval: 1.1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6Thread.sleep(forTimeInterval: 0.9) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache: [Key: (value: Value, expiration: TimeInterval)] = [:]
private var timer: Timer?
init(expiration: TimeInterval) {
timer = Timer.scheduledTimer(withTimeInterval: expiration, repeats: true) { [weak self] _ in
self?.removeExpired()
}
}
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = (value, expiration)
}
func get(key: Key) -> Value? {
guard let (value, expiration) = cache[key] else { return nil }
if expiration < Date().timeIntervalSince1970 {
remove(key: key)
return nil
}
return value
}
func remove(key: Key) {
cache.removeValue(forKey: key)
}
func removeExpired() {
let now = Date().timeIntervalSince1970
cache.removeAll { (key, value) -> Bool in
value.expiration < now
}
}
}```swift
protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
// Caching mechanism with expiration eviction policy.
// Subscript methods used for convenient access.
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache: [Key: (value: Value, expiration: TimeInterval)] = [:]
private var timer: Timer?
init(expiration: TimeInterval) {
timer = Timer.scheduledTimer(withTimeInterval: expiration, repeats: true) { [weak self] _ in
self?.removeExpired()
}
}
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = (value, expiration)
}
func get(key: Key) -> Value? {
guard let (value, expiration) = cache[key] else { return nil }
if expiration < Date().timeIntervalSince1970 {
remove(key: key)
return nil
}
return value
}
func remove(key: Key) {
cache.removeValue(forKey: key)
}
func removeExpired() {
let now = Date().timeIntervalSince1970
cache.removeAll { (key, value) -> Bool in
value.expiration < now
}
}
}
```cache.removeAll { (key, value) -> Bool in // extra trailing closure passed in calllet cache = ExpirableCache<String, String>() // missing argument for parameter 'expiration' in callThread.sleep(forTimeInterval: 1.1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6Thread.sleep(forTimeInterval: 0.9) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache: [Key: (value: Value, expiration: TimeInterval)] = [:]
private var timer: Timer?
init(expiration: TimeInterval) {
timer = Timer.scheduledTimer(withTimeInterval: expiration, repeats: true) { [weak self] _ in
self?.removeExpired()
}
}
deinit {
timer?.invalidate()
}
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = (value, expiration)
}
func get(key: Key) -> Value? {
guard let (value, expiration) = cache[key] else {
return nil
}
if expiration > Date().timeIntervalSince1970 {
return value
} else {
remove(key: key)
return nil
}
}
func remove(key: Key) {
cache.removeValue(forKey: key)
}
func removeExpired() {
let now = Date().timeIntervalSince1970
cache = cache.filter { $0.value.expiration > now }
}
}
extension ExpirableCache: ExpirableCacheProtocol {
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
if let newValue = newValue {
put(value: newValue, key: key, expiration: Date().timeIntervalSince1970 + 10)
} else {
remove(key: key)
}
}
}
}```swift
protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
// Caching mechanism with expiration eviction policy.
// Subscript methods used for convenient access.
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache: [Key: (value: Value, expiration: TimeInterval)] = [:]
private var timer: Timer?
init(expiration: TimeInterval) {
timer = Timer.scheduledTimer(withTimeInterval: expiration, repeats: true) { [weak self] _ in
self?.removeExpired()
}
}
deinit {
timer?.invalidate()
}
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = (value, expiration)
}
func get(key: Key) -> Value? {
guard let (value, expiration) = cache[key] else {
return nil
}
if expiration > Date().timeIntervalSince1970 {
return value
} else {
remove(key: key)
return nil
}
}
func remove(key: Key) {
cache.removeValue(forKey: key)
}
func removeExpired() {
let now = Date().timeIntervalSince1970
cache = cache.filter { $0.value.expiration > now }
}
}
extension ExpirableCache: ExpirableCacheProtocol {
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
if let newValue = newValue {
put(value: newValue, key: key, expiration: Date().timeIntervalSince1970 + 10)
} else {
remove(key: key)
}
}
}
}
let cache = ExpirableCache<String, Int>(expiration: 10)
cache["key"] = 10
cache["key"] = nil
```extension ExpirableCache: ExpirableCacheProtocol { // redundant conformance of 'ExpirableCache<Key, Value>' to protocol 'ExpirableCacheProtocol'let cache = ExpirableCache<String, String>() // missing argument for parameter 'expiration' in callThread.sleep(forTimeInterval: 1.1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6Thread.sleep(forTimeInterval: 0.9) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache: [Key: (value: Value, expiration: TimeInterval)] = [:]
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = (value, expiration)
}
func get(key: Key) -> Value? {
if let (value, expiration) = cache[key], expiration > Date().timeIntervalSinceReferenceDate {
return value
} else {
cache[key] = nil
return nil
}
}
}```swift
protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
// Caching mechanism with expiration eviction policy.
// Subscript methods used for convenient access.
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache: [Key: (value: Value, expiration: TimeInterval)] = [:]
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = (value, expiration)
}
func get(key: Key) -> Value? {
if let (value, expiration) = cache[key], expiration > Date().timeIntervalSinceReferenceDate {
return value
} else {
cache[key] = nil
return nil
}
}
}
// Usage
let cache = ExpirableCache<String, Int>()
cache["key"] = 1
cache["key"] // 1
// Expiration
let cache = ExpirableCache<String, Int>()
cache["key"] = 1
cache["key"] // 1
// Expiration
let cache = ExpirableCache<String, Int>()
cache["key"] = 1
cache["key"] // 1
// Expiration
let cache = ExpirableCache<String, Int>()
cache["key"] = 1
cache["key"] // 1
// Expiration
let cache = ExpirableCache<String, Int>()
cache["key"] = 1
cache["key"] // 1
// Expiration
let cache = ExpirableCache<String, Int>()
cache["key"] = 1
cache["key"] // 1
// Expiration
let cache = ExpirableCache<String, Int>()
cache["key"] = 1
cache["key"] // 1
// Expiration
let cache = ExpirableCache<String, Int>()
cache["key"] = 1
cache["key"] // 1
// Expiration
let cache = ExpirableCache<String, Int>()
cache["key"] = 1
cache["key"] // 1
// Expiration
let cache = ExpirableCache<String, Int>()
cache["key"] = 1
cache["key"] // 1
// Expiration
let cache = ExpirableCache<String, Int>()
cache["key"] = 1
cache["key"] // 1
// Expiration
let cache = ExpirableCache<String, Int>()
cache["key"] = 1
cache["key"] // 1
// Expiration
let cache = ExpirableCache<String, Int>()
cache["key"] = 1
cache["key"] // 1
// Expiration
let cache = ExpirableCache<String, Int>()
cache["key"] = 1
cache["key"] // 1
// Expiration
let cache = ExpirableCache<String, Int>()
cache["key"] = 1
cache["key"] // 1
// Expiration
let cache = ExpirableCache<String, Int>()
cache["key"] = 1
cache["key"] // 1
// Expiration
let cache = ExpirableCache<String, Int>()
cache["key"] = 1
cache["key"] // 1
// Expiration
let cache = ExpirableCache<String, Int>()
cache["key"] = 1
cache["key"] // 1
// Expiration
let cache = ExpirableCache<String, Int>()
cache["key"] = 1
cache["key"] // 1
// Expiration
let cache = ExpirableCache<String, Int>()
cache["key"] = 1
cache["key"] // 1
// Expiration
let cache = ExpirableCache<String, Int>()
cache["key"] = 1
cache["key"] // 1
// Expiration
let cache = ExpirableCache<String, Int>()
cache["key"] = 1
cache["key"] // 1
// Expiration
let cache = ExpirableCache<String, Int>()
cache["key"] = 1
cache["key"] // 1
// Expiration
let cache = ExpirableCache<String, Int>()
cache["key"] = 1
cache["key"] // 1
// Expiration
let cache = ExpirableCache<String, Int>()
cache["key"] = 1
cache["key"] // 1
// Expiration
let cache = ExpirableCache<String, Int>()
cache["key"] = 1
cache["key"] //Thread.sleep(forTimeInterval: 1.1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6Thread.sleep(forTimeInterval: 0.9) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6 // XCTAssertEqual failed: (nil) is not equal to (Optional("Hello, SwiftEval!"))protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache: [Key: (value: Value, expiration: TimeInterval)] = [:]
private var timer: Timer?
init() {
timer = Timer.scheduledTimer(withTimeInterval: 1, repeats: true) { [weak self] _ in
self?.cleanUp()
}
}
deinit {
timer?.invalidate()
}
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = (value, expiration)
}
func get(key: Key) -> Value? {
guard let (value, expiration) = cache[key] else {
return nil
}
if expiration < Date().timeIntervalSince1970 {
cache[key] = nil
return nil
}
return value
}
private func cleanUp() {
let now = Date().timeIntervalSince1970
cache = cache.filter { now < $0.value.expiration }
}
}```swift
protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
// Caching mechanism with expiration eviction policy.
// Subscript methods used for convenient access.
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache: [Key: (value: Value, expiration: TimeInterval)] = [:]
private var timer: Timer?
init() {
timer = Timer.scheduledTimer(withTimeInterval: 1, repeats: true) { [weak self] _ in
self?.cleanUp()
}
}
deinit {
timer?.invalidate()
}
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = (value, expiration)
}
func get(key: Key) -> Value? {
guard let (value, expiration) = cache[key] else {
return nil
}
if expiration < Date().timeIntervalSince1970 {
cache[key] = nil
return nil
}
return value
}
private func cleanUp() {
let now = Date().timeIntervalSince1970
cache = cache.filter { now < $0.value.expiration }
}
}
// Usage
let cache = ExpirableCache<String, Int>()
cache["key"] = 1, expiration: 10
cache["key"] // 1
// Wait 10 seconds
cache["key"] // nil
```Thread.sleep(forTimeInterval: 1.1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6Thread.sleep(forTimeInterval: 0.9) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6 // XCTAssertEqual failed: (nil) is not equal to (Optional("Hello, SwiftEval!"))protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var storage: [Key: (value: Value, expiration: TimeInterval)] = [:]
func put(value: Value, key: Key, expiration: TimeInterval) {
storage[key] = (value, expiration)
}
func get(key: Key) -> Value? {
guard let (value, expiration) = storage[key] else {
return nil
}
if expiration > Date().timeIntervalSince1970 {
return value
} else {
storage[key] = nil
return nil
}
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
if let value = newValue {
put(value: value, key: key, expiration: Date().timeIntervalSince1970 + 60 * 60)
} else {
storage[key] = nil
}
}
}
}```swift
protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
// Caching mechanism with expiration eviction policy.
// Subscript methods used for convenient access.
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var storage: [Key: (value: Value, expiration: TimeInterval)] = [:]
func put(value: Value, key: Key, expiration: TimeInterval) {
storage[key] = (value, expiration)
}
func get(key: Key) -> Value? {
guard let (value, expiration) = storage[key] else {
return nil
}
if expiration > Date().timeIntervalSince1970 {
return value
} else {
storage[key] = nil
return nil
}
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
if let value = newValue {
put(value: value, key: key, expiration: Date().timeIntervalSince1970 + 60 * 60)
} else {
storage[key] = nil
}
}
}
}
// Example usage
let cache = ExpirableCache<String, Int>()
cache["key"] = 1
cache["key"] = 2
cache["key"] = 3
print(cache["key"]!) // 3
// Wait for 1 hour
print(cache["key"]!) // nil
```Thread.sleep(forTimeInterval: 1.1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6Thread.sleep(forTimeInterval: 0.9) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6 // XCTAssertEqual failed: (nil) is not equal to (Optional("Hello, SwiftEval!"))protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache: [Key: (value: Value, expiration: TimeInterval)] = [:]
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = (value, expiration)
}
func get(key: Key) -> Value? {
guard let (value, expiration) = cache[key] else { return nil }
if expiration > Date().timeIntervalSince1970 {
return value
} else {
cache.removeValue(forKey: key)
return nil
}
}
}```swift
protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
// Caching mechanism with expiration eviction policy.
// Subscript methods used for convenient access.
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache: [Key: (value: Value, expiration: TimeInterval)] = [:]
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = (value, expiration)
}
func get(key: Key) -> Value? {
guard let (value, expiration) = cache[key] else { return nil }
if expiration > Date().timeIntervalSince1970 {
return value
} else {
cache.removeValue(forKey: key)
return nil
}
}
}
let cache = ExpirableCache<String, Int>()
cache["key"] = 1
cache["key"] = 2
cache["key"] = 3
print(cache["key"]!) // 3
// Wait for 1 second
print(cache["key"]!) // nil
```Thread.sleep(forTimeInterval: 1.1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6Thread.sleep(forTimeInterval: 0.9) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6 // XCTAssertEqual failed: (nil) is not equal to (Optional("Hello, SwiftEval!"))protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache: [Key: (value: Value, expiration: TimeInterval)] = [:]
private var timer: Timer?
init() {
timer = Timer.scheduledTimer(withTimeInterval: 1, repeats: true) { [weak self] _ in
self?.removeExpired()
}
}
deinit {
timer?.invalidate()
}
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = (value, expiration)
}
func get(key: Key) -> Value? {
guard let (value, expiration) = cache[key] else { return nil }
if expiration > Date().timeIntervalSince1970 {
return value
} else {
cache.removeValue(forKey: key)
return nil
}
}
private func removeExpired() {
let now = Date().timeIntervalSince1970
cache = cache.filter { $0.value.expiration > now }
}
}```swift
protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
// Caching mechanism with expiration eviction policy.
// Subscript methods used for convenient access.
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache: [Key: (value: Value, expiration: TimeInterval)] = [:]
private var timer: Timer?
init() {
timer = Timer.scheduledTimer(withTimeInterval: 1, repeats: true) { [weak self] _ in
self?.removeExpired()
}
}
deinit {
timer?.invalidate()
}
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = (value, expiration)
}
func get(key: Key) -> Value? {
guard let (value, expiration) = cache[key] else { return nil }
if expiration > Date().timeIntervalSince1970 {
return value
} else {
cache.removeValue(forKey: key)
return nil
}
}
private func removeExpired() {
let now = Date().timeIntervalSince1970
cache = cache.filter { $0.value.expiration > now }
}
}
```Thread.sleep(forTimeInterval: 1.1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6Thread.sleep(forTimeInterval: 0.9) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6 // XCTAssertEqual failed: (nil) is not equal to (Optional("Hello, SwiftEval!"))protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache: [Key: (value: Value, expiration: TimeInterval)] = [:]
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = (value, expiration + Date().timeIntervalSince1970)
}
func get(key: Key) -> Value? {
guard let (value, expiration) = cache[key] else { return nil }
if expiration > Date().timeIntervalSince1970 {
return value
} else {
cache.removeValue(forKey: key)
return nil
}
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
if let newValue = newValue {
put(value: newValue, key: key, expiration: 60 * 60 * 24)
} else {
cache.removeValue(forKey: key)
}
}
}
}```swift
protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
// Caching mechanism with expiration eviction policy.
// Subscript methods used for convenient access.
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache: [Key: (value: Value, expiration: TimeInterval)] = [:]
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = (value, expiration + Date().timeIntervalSince1970)
}
func get(key: Key) -> Value? {
guard let (value, expiration) = cache[key] else { return nil }
if expiration > Date().timeIntervalSince1970 {
return value
} else {
cache.removeValue(forKey: key)
return nil
}
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
if let newValue = newValue {
put(value: newValue, key: key, expiration: 60 * 60 * 24)
} else {
cache.removeValue(forKey: key)
}
}
}
}
let cache = ExpirableCache<String, Int>()
cache["a"] = 1
cache["b"] = 2
cache["c"] = 3
print(cache["a"]) // 1
print(cache["b"]) // 2
print(cache["c"]) // 3
// Wait for 10 seconds
print(cache["a"]) // nil
print(cache["b"]) // 2
print(cache["c"]) // 3
```Thread.sleep(forTimeInterval: 1.1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6Thread.sleep(forTimeInterval: 0.9) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
var encryptedData = Data()
for (index, char) in string.enumerated() {
let keyChar = key[index % key.count]
let encryptedChar = char ^ keyChar
encryptedData.append(encryptedChar)
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
var decryptedString = ""
for (index, char) in data.enumerated() {
let keyChar = key[index % key.count]
let decryptedChar = char ^ keyChar
decryptedString.append(decryptedChar)
}
return decryptedString
}
}```swift
protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
// Simple XOR encryptor and decryptor that converts plain text into encrypted text by applying the binary 'Exclusive OR' operator implemented according to the protocol.
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
var encryptedData = Data()
for (index, char) in string.enumerated() {
let keyChar = key[index % key.count]
let encryptedChar = char ^ keyChar
encryptedData.append(encryptedChar)
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
var decryptedString = ""
for (index, char) in data.enumerated() {
let keyChar = key[index % key.count]
let decryptedChar = char ^ keyChar
decryptedString.append(decryptedChar)
}
return decryptedString
}
}
// Usage
let encryptor = Encryptor()
let key = "1234567890123456"
let plainText = "Hello, World!"
let encryptedData = encryptor.encrypt(plainText, key)
let decryptedText = encryptor.decrypt(encryptedData, key)
print(encryptedData)
print(decryptedText)
```let keyChar = key[index % key.count] // 'subscript(_:)' is unavailable: cannot subscript String with an Int, use a String.Index instead.let encryptedChar = char ^ keyChar // binary operator '^' cannot be applied to two 'String.Element' (aka 'Character') operandslet keyChar = key[index % key.count] // 'subscript(_:)' is unavailable: cannot subscript String with an Int, use a String.Index instead.let decryptedChar = char ^ keyChar // cannot convert value of type 'Character' to expected argument type 'UInt8'protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
var data = Data()
for (index, char) in string.enumerated() {
let keyChar = key[index % key.count]
let encryptedChar = char ^ keyChar
data.append(encryptedChar)
}
return data
}
func decrypt(_ data: Data, _ key: String) -> String {
var string = ""
for (index, char) in data.enumerated() {
let keyChar = key[index % key.count]
let decryptedChar = char ^ keyChar
string.append(decryptedChar)
}
return string
}
}```swift
protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
// Simple XOR encryptor and decryptor that converts plain text into encrypted text by applying the binary 'Exclusive OR' operator implemented according to the protocol.
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
var data = Data()
for (index, char) in string.enumerated() {
let keyChar = key[index % key.count]
let encryptedChar = char ^ keyChar
data.append(encryptedChar)
}
return data
}
func decrypt(_ data: Data, _ key: String) -> String {
var string = ""
for (index, char) in data.enumerated() {
let keyChar = key[index % key.count]
let decryptedChar = char ^ keyChar
string.append(decryptedChar)
}
return string
}
}
// Usage
let encryptor = Encryptor()
let key = "12345678901234567890123456789012"
let plainText = "Hello, World!"
let encryptedData = encryptor.encrypt(plainText, key)
let decryptedText = encryptor.decrypt(encryptedData, key)
print(encryptedData)
print(decryptedText)
```let keyChar = key[index % key.count] // 'subscript(_:)' is unavailable: cannot subscript String with an Int, use a String.Index instead.let encryptedChar = char ^ keyChar // binary operator '^' cannot be applied to two 'String.Element' (aka 'Character') operandslet keyChar = key[index % key.count] // 'subscript(_:)' is unavailable: cannot subscript String with an Int, use a String.Index instead.let decryptedChar = char ^ keyChar // cannot convert value of type 'Character' to expected argument type 'UInt8'protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
var encryptedData = Data()
for (index, char) in string.enumerated() {
let keyChar = key[index % key.count]
let encryptedChar = char ^ keyChar
encryptedData.append(encryptedChar)
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
var decryptedString = ""
for (index, char) in data.enumerated() {
let keyChar = key[index % key.count]
let decryptedChar = char ^ keyChar
decryptedString.append(decryptedChar)
}
return decryptedString
}
}```swift
protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
// Simple XOR encryptor and decryptor that converts plain text into encrypted text by applying the binary 'Exclusive OR' operator implemented according to the protocol.
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
var encryptedData = Data()
for (index, char) in string.enumerated() {
let keyChar = key[index % key.count]
let encryptedChar = char ^ keyChar
encryptedData.append(encryptedChar)
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
var decryptedString = ""
for (index, char) in data.enumerated() {
let keyChar = key[index % key.count]
let decryptedChar = char ^ keyChar
decryptedString.append(decryptedChar)
}
return decryptedString
}
}
```let keyChar = key[index % key.count] // 'subscript(_:)' is unavailable: cannot subscript String with an Int, use a String.Index instead.let encryptedChar = char ^ keyChar // binary operator '^' cannot be applied to two 'String.Element' (aka 'Character') operandslet keyChar = key[index % key.count] // 'subscript(_:)' is unavailable: cannot subscript String with an Int, use a String.Index instead.let decryptedChar = char ^ keyChar // cannot convert value of type 'Character' to expected argument type 'UInt8'protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let data = string.data(using: .utf8)!
let keyData = key.data(using: .utf8)!
let result = NSMutableData(length: data.count)!
for i in 0..<data.count {
result.replaceBytes(in: i..<i+1, withBytes: [UInt8(data[i] ^ keyData[i % keyData.count])])
}
return result as Data
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)!
let result = NSMutableData(length: data.count)!
for i in 0..<data.count {
result.replaceBytes(in: i..<i+1, withBytes: [UInt8(data[i] ^ keyData[i % keyData.count])])
}
return String(data: result as Data, encoding: .utf8)!
}
}
class EncryptorFactory {
static func getEncryptor(algorithm: String) -> EncryptorProtocol {
switch algorithm {
case "XOR":
return Encryptor()
default:
fatalError("Unsupported algorithm: \(algorithm)")
}
}
}
class EncryptionService {
private let encryptor: EncryptorProtocol
init(algorithm: String) {
encryptor = EncryptorFactory.getEncryptor(algorithm: algorithm)
}
func encrypt(_ string: String, _ key: String) -> String {
return encryptor.encrypt(string, key).base64EncodedString()
}
func decrypt(_ string: String, _ key: String) -> String {
return encryptor.decrypt(Data(base64Encoded: string)!, key)
}
}```swift
protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
// Simple XOR encryptor and decryptor that converts plain text into encrypted text by applying the binary 'Exclusive OR' operator implemented according to the protocol.
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let data = string.data(using: .utf8)!
let keyData = key.data(using: .utf8)!
let result = NSMutableData(length: data.count)!
for i in 0..<data.count {
result.replaceBytes(in: i..<i+1, withBytes: [UInt8(data[i] ^ keyData[i % keyData.count])])
}
return result as Data
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)!
let result = NSMutableData(length: data.count)!
for i in 0..<data.count {
result.replaceBytes(in: i..<i+1, withBytes: [UInt8(data[i] ^ keyData[i % keyData.count])])
}
return String(data: result as Data, encoding: .utf8)!
}
}
// EncryptorFactory is a factory class that creates an encryptor based on the given algorithm.
class EncryptorFactory {
static func getEncryptor(algorithm: String) -> EncryptorProtocol {
switch algorithm {
case "XOR":
return Encryptor()
default:
fatalError("Unsupported algorithm: \(algorithm)")
}
}
}
// EncryptionService is a service class that provides encryption and decryption services.
class EncryptionService {
private let encryptor: EncryptorProtocol
init(algorithm: String) {
encryptor = EncryptorFactory.getEncryptor(algorithm: algorithm)
}
func encrypt(_ string: String, _ key: String) -> String {
return encryptor.encrypt(string, key).base64EncodedString()
}
func decrypt(_ string: String, _ key: String) -> String {
return encryptor.decrypt(Data(base64Encoded: string)!, key)
}
}
// Usage
let encryptionService = EncryptionService(algorithm: "XOR")
let encryptedString = encryptionService.encrypt("Hello, World!", "1234567890")
print(encryptedString)
let decryptedString = encryptionService.decrypt(encryptedString, "1234567890")
print(decryptedString)
```result.replaceBytes(in: i..<i+1, withBytes: [UInt8(data[i] ^ keyData[i % keyData.count])]) // cannot convert value of type 'Range<Int>' to expected argument type 'NSRange' (aka '_NSRange')result.replaceBytes(in: i..<i+1, withBytes: [UInt8(data[i] ^ keyData[i % keyData.count])]) // cannot convert value of type 'Range<Int>' to expected argument type 'NSRange' (aka '_NSRange')protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
var encryptedData = Data()
for (index, char) in string.enumerated() {
let keyChar = key[index % key.count]
let encryptedChar = char ^ keyChar
encryptedData.append(encryptedChar)
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
var decryptedString = ""
for (index, char) in data.enumerated() {
let keyChar = key[index % key.count]
let decryptedChar = char ^ keyChar
decryptedString.append(decryptedChar)
}
return decryptedString
}
}```swift
protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
// Simple XOR encryptor and decryptor that converts plain text into encrypted text by applying the binary 'Exclusive OR' operator implemented according to the protocol.
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
var encryptedData = Data()
for (index, char) in string.enumerated() {
let keyChar = key[index % key.count]
let encryptedChar = char ^ keyChar
encryptedData.append(encryptedChar)
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
var decryptedString = ""
for (index, char) in data.enumerated() {
let keyChar = key[index % key.count]
let decryptedChar = char ^ keyChar
decryptedString.append(decryptedChar)
}
return decryptedString
}
}
```let keyChar = key[index % key.count] // 'subscript(_:)' is unavailable: cannot subscript String with an Int, use a String.Index instead.let encryptedChar = char ^ keyChar // binary operator '^' cannot be applied to two 'String.Element' (aka 'Character') operandslet keyChar = key[index % key.count] // 'subscript(_:)' is unavailable: cannot subscript String with an Int, use a String.Index instead.let decryptedChar = char ^ keyChar // cannot convert value of type 'Character' to expected argument type 'UInt8'protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
var encryptedData = Data()
for (index, char) in string.enumerated() {
let keyChar = key[index % key.count]
let encryptedChar = char ^ keyChar
encryptedData.append(encryptedChar)
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
var decryptedString = ""
for (index, char) in data.enumerated() {
let keyChar = key[index % key.count]
let decryptedChar = char ^ keyChar
decryptedString.append(decryptedChar)
}
return decryptedString
}
}```swift
protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
// Simple XOR encryptor and decryptor that converts plain text into encrypted text by applying the binary 'Exclusive OR' operator implemented according to the protocol.
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
var encryptedData = Data()
for (index, char) in string.enumerated() {
let keyChar = key[index % key.count]
let encryptedChar = char ^ keyChar
encryptedData.append(encryptedChar)
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
var decryptedString = ""
for (index, char) in data.enumerated() {
let keyChar = key[index % key.count]
let decryptedChar = char ^ keyChar
decryptedString.append(decryptedChar)
}
return decryptedString
}
}
```let keyChar = key[index % key.count] // 'subscript(_:)' is unavailable: cannot subscript String with an Int, use a String.Index instead.let encryptedChar = char ^ keyChar // binary operator '^' cannot be applied to two 'String.Element' (aka 'Character') operandslet keyChar = key[index % key.count] // 'subscript(_:)' is unavailable: cannot subscript String with an Int, use a String.Index instead.let decryptedChar = char ^ keyChar // cannot convert value of type 'Character' to expected argument type 'UInt8'protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let keyData = key.data(using: .utf8)!
let data = string.data(using: .utf8)!
var encryptedData = Data(count: data.count)
for i in 0..<data.count {
encryptedData[i] = data[i] ^ keyData[i % keyData.count]
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)!
var decryptedData = Data(count: data.count)
for i in 0..<data.count {
decryptedData[i] = data[i] ^ keyData[i % keyData.count]
}
return String(data: decryptedData, encoding: .utf8)!
}
}
class AESCryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let keyData = key.data(using: .utf8)!
let data = string.data(using: .utf8)!
let aes = try! AES(key: keyData, blockMode: CBC(iv: keyData), padding: .pkcs7)
let encryptedData = try! aes.encrypt(data.bytes)
return Data(encryptedData)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)!
let aes = try! AES(key: keyData, blockMode: CBC(iv: keyData), padding: .pkcs7)
let decryptedData = try! aes.decrypt(data.bytes)
return String(data: Data(decryptedData), encoding: .utf8)!
}
}
class RSACryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let keyData = key.data(using: .utf8)!
let data = string.data(using: .utf8)!
let rsa = try! RSA(key: keyData)
let encryptedData = try! rsa.encrypt(data.bytes)
return Data(encryptedData)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)!
let rsa = try! RSA(key: keyData)
let decryptedData = try! rsa.decrypt(data.bytes)
return String(data: Data(decryptedData), encoding: .utf8)!
}
}
class ECCCryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let keyData = key.data(using: .utf8)!
let data = string.data(using: .utf8)!
let ecc = try! ECC(key: keyData)
let encryptedData = try! ecc.encrypt(data.bytes)
return Data(encryptedData)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)!
let ecc = try! ECC(key: keyData)
let decryptedData = try! ecc.decrypt(data.bytes)
return String(data: Data(decryptedData), encoding: .utf8)!
}
}```swift
protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
// Simple XOR encryptor and decryptor that converts plain text into encrypted text by applying the binary 'Exclusive OR' operator implemented according to the protocol.
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let keyData = key.data(using: .utf8)!
let data = string.data(using: .utf8)!
var encryptedData = Data(count: data.count)
for i in 0..<data.count {
encryptedData[i] = data[i] ^ keyData[i % keyData.count]
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)!
var decryptedData = Data(count: data.count)
for i in 0..<data.count {
decryptedData[i] = data[i] ^ keyData[i % keyData.count]
}
return String(data: decryptedData, encoding: .utf8)!
}
}
// Encryptor that uses AES encryption
class AESCryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let keyData = key.data(using: .utf8)!
let data = string.data(using: .utf8)!
let aes = try! AES(key: keyData, blockMode: CBC(iv: keyData), padding: .pkcs7)
let encryptedData = try! aes.encrypt(data.bytes)
return Data(encryptedData)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)!
let aes = try! AES(key: keyData, blockMode: CBC(iv: keyData), padding: .pkcs7)
let decryptedData = try! aes.decrypt(data.bytes)
return String(data: Data(decryptedData), encoding: .utf8)!
}
}
// Encryptor that uses RSA encryption
class RSACryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let keyData = key.data(using: .utf8)!
let data = string.data(using: .utf8)!
let rsa = try! RSA(key: keyData)
let encryptedData = try! rsa.encrypt(data.bytes)
return Data(encryptedData)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)!
let rsa = try! RSA(key: keyData)
let decryptedData = try! rsa.decrypt(data.bytes)
return String(data: Data(decryptedData), encoding: .utf8)!
}
}
// Encryptor that uses ECC encryption
class ECCCryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let keyData = key.data(using: .utf8)!
let data = string.data(using: .utf8)!
let ecc = try! ECC(key: keyData)
let encryptedData = try! ecc.encrypt(data.bytes)
return Data(encryptedData)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)!
let ecc = try! ECC(key: keyData)
let decryptedData = try! ecc.decrypt(data.bytes)
return String(data: Data(decryptedData), encoding: .utf8)!
}
}
```let aes = try! AES(key: keyData, blockMode: CBC(iv: keyData), padding: .pkcs7) // cannot find 'CBC' in scopelet aes = try! AES(key: keyData, blockMode: CBC(iv: keyData), padding: .pkcs7) // cannot find 'AES' in scopelet aes = try! AES(key: keyData, blockMode: CBC(iv: keyData), padding: .pkcs7) // cannot infer contextual base in reference to member 'pkcs7'let encryptedData = try! aes.encrypt(data.bytes) // value of type 'Data' has no member 'bytes'let aes = try! AES(key: keyData, blockMode: CBC(iv: keyData), padding: .pkcs7) // cannot find 'CBC' in scopelet aes = try! AES(key: keyData, blockMode: CBC(iv: keyData), padding: .pkcs7) // cannot infer contextual base in reference to member 'pkcs7'let aes = try! AES(key: keyData, blockMode: CBC(iv: keyData), padding: .pkcs7) // cannot find 'AES' in scopelet decryptedData = try! aes.decrypt(data.bytes) // value of type 'Data' has no member 'bytes'let rsa = try! RSA(key: keyData) // cannot find 'RSA' in scopelet encryptedData = try! rsa.encrypt(data.bytes) // value of type 'Data' has no member 'bytes'let rsa = try! RSA(key: keyData) // cannot find 'RSA' in scopelet decryptedData = try! rsa.decrypt(data.bytes) // value of type 'Data' has no member 'bytes'let ecc = try! ECC(key: keyData) // cannot find 'ECC' in scopelet encryptedData = try! ecc.encrypt(data.bytes) // value of type 'Data' has no member 'bytes'let ecc = try! ECC(key: keyData) // cannot find 'ECC' in scopelet decryptedData = try! ecc.decrypt(data.bytes) // value of type 'Data' has no member 'bytes'protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let data = string.data(using: .utf8)!
var encryptedData = Data(count: data.count)
for i in 0..<data.count {
encryptedData[i] = data[i] ^ key[i % key.count]
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
var decryptedData = Data(count: data.count)
for i in 0..<data.count {
decryptedData[i] = data[i] ^ key[i % key.count]
}
return String(data: decryptedData, encoding: .utf8)!
}
}```swift
protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
// Simple XOR encryptor and decryptor that converts plain text into encrypted text by applying the binary 'Exclusive OR' operator implemented according to the protocol.
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let data = string.data(using: .utf8)!
var encryptedData = Data(count: data.count)
for i in 0..<data.count {
encryptedData[i] = data[i] ^ key[i % key.count]
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
var decryptedData = Data(count: data.count)
for i in 0..<data.count {
decryptedData[i] = data[i] ^ key[i % key.count]
}
return String(data: decryptedData, encoding: .utf8)!
}
}
```encryptedData[i] = data[i] ^ key[i % key.count] // cannot convert value of type 'Character' to expected argument type 'UInt8'decryptedData[i] = data[i] ^ key[i % key.count] // cannot convert value of type 'Character' to expected argument type 'UInt8'protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
var data = Data(string.utf8)
let keyData = Data(key.utf8)
for i in 0..<data.count {
data[i] = data[i] ^ keyData[i % keyData.count]
}
return data
}
func decrypt(_ data: Data, _ key: String) -> String {
var data = data
let keyData = Data(key.utf8)
for i in 0..<data.count {
data[i] = data[i] ^ keyData[i % keyData.count]
}
return String(data: data, encoding: .utf8)!
}
}```swift
protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
// Simple XOR encryptor and decryptor that converts plain text into encrypted text by applying the binary 'Exclusive OR' operator implemented according to the protocol.
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
var data = Data(string.utf8)
let keyData = Data(key.utf8)
for i in 0..<data.count {
data[i] = data[i] ^ keyData[i % keyData.count]
}
return data
}
func decrypt(_ data: Data, _ key: String) -> String {
var data = data
let keyData = Data(key.utf8)
for i in 0..<data.count {
data[i] = data[i] ^ keyData[i % keyData.count]
}
return String(data: data, encoding: .utf8)!
}
}
```protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let data = string.data(using: .utf8)!
let keyData = key.data(using: .utf8)!
var encryptedData = Data()
for i in 0..<data.count {
let byte = data[i] ^ keyData[i % keyData.count]
encryptedData.append(byte)
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)!
var decryptedData = Data()
for i in 0..<data.count {
let byte = data[i] ^ keyData[i % keyData.count]
decryptedData.append(byte)
}
return String(data: decryptedData, encoding: .utf8)!
}
}```swift
protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
// Simple XOR encryptor and decryptor that converts plain text into encrypted text by applying the binary 'Exclusive OR' operator implemented according to the protocol.
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let data = string.data(using: .utf8)!
let keyData = key.data(using: .utf8)!
var encryptedData = Data()
for i in 0..<data.count {
let byte = data[i] ^ keyData[i % keyData.count]
encryptedData.append(byte)
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)!
var decryptedData = Data()
for i in 0..<data.count {
let byte = data[i] ^ keyData[i % keyData.count]
decryptedData.append(byte)
}
return String(data: decryptedData, encoding: .utf8)!
}
}
```protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var lastRequestTime: TimeInterval?
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
if let lastRequestTime = lastRequestTime {
let timeSinceLastRequest = Date().timeIntervalSince(lastRequestTime)
if timeSinceLastRequest < timeInterval {
return false
}
}
lastRequestTime = Date()
return true
}
}```swift
protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var lastRequestTime: TimeInterval?
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
if let lastRequestTime = lastRequestTime {
let timeSinceLastRequest = Date().timeIntervalSince(lastRequestTime)
if timeSinceLastRequest < timeInterval {
return false
}
}
lastRequestTime = Date()
return true
}
}
```init(maxRequests: Int, timeInterval: TimeInterval) { // initializer requirement 'init(maxRequests:timeInterval:)' can only be satisfied by a 'required' initializer in non-final class 'RateLimiter'let timeSinceLastRequest = Date().timeIntervalSince(lastRequestTime) // cannot convert value of type 'TimeInterval' (aka 'Double') to expected argument type 'Date'lastRequestTime = Date() // cannot assign value of type 'Date' to type 'TimeInterval?' (aka 'Optional<Double>')Thread.sleep(forTimeInterval: 1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var lastRequestTime: TimeInterval
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
self.lastRequestTime = Date().timeIntervalSince1970
}
func allowRequest() -> Bool {
let currentTime = Date().timeIntervalSince1970
let timeSinceLastRequest = currentTime - lastRequestTime
if timeSinceLastRequest < timeInterval {
return false
}
lastRequestTime = currentTime
return true
}
}```swift
protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var lastRequestTime: TimeInterval
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
self.lastRequestTime = Date().timeIntervalSince1970
}
func allowRequest() -> Bool {
let currentTime = Date().timeIntervalSince1970
let timeSinceLastRequest = currentTime - lastRequestTime
if timeSinceLastRequest < timeInterval {
return false
}
lastRequestTime = currentTime
return true
}
}
```init(maxRequests: Int, timeInterval: TimeInterval) { // initializer requirement 'init(maxRequests:timeInterval:)' can only be satisfied by a 'required' initializer in non-final class 'RateLimiter'Thread.sleep(forTimeInterval: 1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var lastRequestTime: Date?
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
if let lastRequestTime = lastRequestTime {
let timeSinceLastRequest = Date().timeIntervalSince(lastRequestTime)
if timeSinceLastRequest < timeInterval {
return false
}
}
lastRequestTime = Date()
return true
}
}```swift
protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var lastRequestTime: Date?
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
if let lastRequestTime = lastRequestTime {
let timeSinceLastRequest = Date().timeIntervalSince(lastRequestTime)
if timeSinceLastRequest < timeInterval {
return false
}
}
lastRequestTime = Date()
return true
}
}
```init(maxRequests: Int, timeInterval: TimeInterval) { // initializer requirement 'init(maxRequests:timeInterval:)' can only be satisfied by a 'required' initializer in non-final class 'RateLimiter'Thread.sleep(forTimeInterval: 1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var lastRequestTime: TimeInterval
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
self.lastRequestTime = Date().timeIntervalSince1970
}
func allowRequest() -> Bool {
let currentTime = Date().timeIntervalSince1970
if currentTime - lastRequestTime >= timeInterval {
lastRequestTime = currentTime
return true
}
return false
}
}```swift
protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var lastRequestTime: TimeInterval
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
self.lastRequestTime = Date().timeIntervalSince1970
}
func allowRequest() -> Bool {
let currentTime = Date().timeIntervalSince1970
if currentTime - lastRequestTime >= timeInterval {
lastRequestTime = currentTime
return true
}
return false
}
}
```init(maxRequests: Int, timeInterval: TimeInterval) { // initializer requirement 'init(maxRequests:timeInterval:)' can only be satisfied by a 'required' initializer in non-final class 'RateLimiter'Thread.sleep(forTimeInterval: 1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var lastRequestTime: TimeInterval?
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
if let lastRequestTime = lastRequestTime {
if Date().timeIntervalSince(lastRequestTime) < timeInterval {
return false
}
}
lastRequestTime = Date()
return true
}
}```swift
protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var lastRequestTime: TimeInterval?
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
if let lastRequestTime = lastRequestTime {
if Date().timeIntervalSince(lastRequestTime) < timeInterval {
return false
}
}
lastRequestTime = Date()
return true
}
}
```init(maxRequests: Int, timeInterval: TimeInterval) { // initializer requirement 'init(maxRequests:timeInterval:)' can only be satisfied by a 'required' initializer in non-final class 'RateLimiter'if Date().timeIntervalSince(lastRequestTime) < timeInterval { // cannot convert value of type 'TimeInterval' (aka 'Double') to expected argument type 'Date'lastRequestTime = Date() // cannot assign value of type 'Date' to type 'TimeInterval?' (aka 'Optional<Double>')Thread.sleep(forTimeInterval: 1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var lastRequestTime: TimeInterval?
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
if let lastRequestTime = lastRequestTime {
let timeSinceLastRequest = Date().timeIntervalSince(lastRequestTime)
if timeSinceLastRequest < timeInterval {
return false
}
}
lastRequestTime = Date()
return true
}
}```swift
protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var lastRequestTime: TimeInterval?
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
if let lastRequestTime = lastRequestTime {
let timeSinceLastRequest = Date().timeIntervalSince(lastRequestTime)
if timeSinceLastRequest < timeInterval {
return false
}
}
lastRequestTime = Date()
return true
}
}
```init(maxRequests: Int, timeInterval: TimeInterval) { // initializer requirement 'init(maxRequests:timeInterval:)' can only be satisfied by a 'required' initializer in non-final class 'RateLimiter'let timeSinceLastRequest = Date().timeIntervalSince(lastRequestTime) // cannot convert value of type 'TimeInterval' (aka 'Double') to expected argument type 'Date'lastRequestTime = Date() // cannot assign value of type 'Date' to type 'TimeInterval?' (aka 'Optional<Double>')Thread.sleep(forTimeInterval: 1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var lastRequestTime: TimeInterval
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
self.lastRequestTime = Date().timeIntervalSince1970
}
func allowRequest() -> Bool {
let currentTime = Date().timeIntervalSince1970
let timeSinceLastRequest = currentTime - lastRequestTime
if timeSinceLastRequest < timeInterval {
return false
}
lastRequestTime = currentTime
return true
}
}
class RateLimiter {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var lastRequestTime: TimeInterval
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
self.lastRequestTime = Date().timeIntervalSince1970
}
func allowRequest() -> Bool {
let currentTime = Date().timeIntervalSince1970
let timeSinceLastRequest = currentTime - lastRequestTime
if timeSinceLastRequest < timeInterval {
return false
}
lastRequestTime = currentTime
return true
}
}```swift
protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var lastRequestTime: TimeInterval
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
self.lastRequestTime = Date().timeIntervalSince1970
}
func allowRequest() -> Bool {
let currentTime = Date().timeIntervalSince1970
let timeSinceLastRequest = currentTime - lastRequestTime
if timeSinceLastRequest < timeInterval {
return false
}
lastRequestTime = currentTime
return true
}
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var lastRequestTime: TimeInterval
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
self.lastRequestTime = Date().timeIntervalSince1970
}
func allowRequest() -> Bool {
let currentTime = Date().timeIntervalSince1970
let timeSinceLastRequest = currentTime - lastRequestTime
if timeSinceLastRequest < timeInterval {
return false
}
lastRequestTime = currentTime
return true
}
}
```init(maxRequests: Int, timeInterval: TimeInterval) { // initializer requirement 'init(maxRequests:timeInterval:)' can only be satisfied by a 'required' initializer in non-final class 'RateLimiter'class RateLimiter { // invalid redeclaration of 'RateLimiter'Thread.sleep(forTimeInterval: 1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var lastRequestTime: Date?
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
if lastRequestTime == nil {
lastRequestTime = Date()
return true
}
let timeSinceLastRequest = Date().timeIntervalSince(lastRequestTime!)
if timeSinceLastRequest > timeInterval {
lastRequestTime = Date()
return true
}
return false
}
}```swift
protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var lastRequestTime: Date?
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
if lastRequestTime == nil {
lastRequestTime = Date()
return true
}
let timeSinceLastRequest = Date().timeIntervalSince(lastRequestTime!)
if timeSinceLastRequest > timeInterval {
lastRequestTime = Date()
return true
}
return false
}
}
```Thread.sleep(forTimeInterval: 1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6 // XCTAssertTrue failedprotocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var lastRequestTime: TimeInterval
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
self.lastRequestTime = Date().timeIntervalSince1970
}
func allowRequest() -> Bool {
let currentTime = Date().timeIntervalSince1970
let timeSinceLastRequest = currentTime - lastRequestTime
if timeSinceLastRequest < timeInterval {
return false
}
lastRequestTime = currentTime
return true
}
}```swift
protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var lastRequestTime: TimeInterval
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
self.lastRequestTime = Date().timeIntervalSince1970
}
func allowRequest() -> Bool {
let currentTime = Date().timeIntervalSince1970
let timeSinceLastRequest = currentTime - lastRequestTime
if timeSinceLastRequest < timeInterval {
return false
}
lastRequestTime = currentTime
return true
}
}
```Thread.sleep(forTimeInterval: 1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6 // XCTAssertTrue failedprotocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var lastRequestTime: TimeInterval
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
self.lastRequestTime = Date().timeIntervalSince1970
}
func allowRequest() -> Bool {
let currentTime = Date().timeIntervalSince1970
let timeSinceLastRequest = currentTime - lastRequestTime
if timeSinceLastRequest < timeInterval {
return false
}
lastRequestTime = currentTime
return true
}
}```swift
protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var lastRequestTime: TimeInterval
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
self.lastRequestTime = Date().timeIntervalSince1970
}
func allowRequest() -> Bool {
let currentTime = Date().timeIntervalSince1970
let timeSinceLastRequest = currentTime - lastRequestTime
if timeSinceLastRequest < timeInterval {
return false
}
lastRequestTime = currentTime
return true
}
}
```Thread.sleep(forTimeInterval: 1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6 // XCTAssertTrue failedprotocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let lock = NSLock()
init(value: Int) {
self.value = value
}
func increment() {
lock.lock()
defer { lock.unlock() }
value += 1
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return value
}
}```swift
protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let lock = NSLock()
init(value: Int) {
self.value = value
}
func increment() {
lock.lock()
defer { lock.unlock() }
value += 1
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return value
}
}
```init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounter'protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let lock = NSLock()
init(value: Int) {
self.value = value
}
func increment() {
lock.lock()
defer { lock.unlock() }
value += 1
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return value
}
}```swift
protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let lock = NSLock()
init(value: Int) {
self.value = value
}
func increment() {
lock.lock()
defer { lock.unlock() }
value += 1
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return value
}
}
```init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounter'protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let lock = NSLock()
init(value: Int) {
self.value = value
}
func increment() {
lock.lock()
defer { lock.unlock() }
value += 1
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return value
}
}```swift
protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let lock = NSLock()
init(value: Int) {
self.value = value
}
func increment() {
lock.lock()
defer { lock.unlock() }
value += 1
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return value
}
}
```init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounter'protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let lock = NSLock()
init(value: Int) {
self.value = value
}
func increment() {
lock.lock()
defer { lock.unlock() }
value += 1
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return value
}
}```swift
protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let lock = NSLock()
init(value: Int) {
self.value = value
}
func increment() {
lock.lock()
defer { lock.unlock() }
value += 1
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return value
}
}
```init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounter'protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let lock = NSLock()
init(value: Int) {
self.value = value
}
func increment() {
lock.lock()
defer { lock.unlock() }
value += 1
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return value
}
}```swift
protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let lock = NSLock()
init(value: Int) {
self.value = value
}
func increment() {
lock.lock()
defer { lock.unlock() }
value += 1
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return value
}
}
```init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounter'protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
init(value: Int) {
self.value = value
}
func increment() {
self.value += 1
}
func currentValue() -> Int {
return self.value
}
}```swift
protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
init(value: Int) {
self.value = value
}
func increment() {
self.value += 1
}
func currentValue() -> Int {
return self.value
}
}
```init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounter'protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let lock = NSLock()
init(value: Int) {
self.value = value
}
func increment() {
lock.lock()
defer { lock.unlock() }
value += 1
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return value
}
}```swift
protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let lock = NSLock()
init(value: Int) {
self.value = value
}
func increment() {
lock.lock()
defer { lock.unlock() }
value += 1
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return value
}
}
```init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounter'protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let lock = NSLock()
init(value: Int) {
self.value = value
}
func increment() {
lock.lock()
defer { lock.unlock() }
value += 1
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return value
}
}```swift
protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let lock = NSLock()
init(value: Int) {
self.value = value
}
func increment() {
lock.lock()
defer { lock.unlock() }
value += 1
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return value
}
}
```init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounter'protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let lock = NSLock()
init(value: Int) {
self.value = value
}
func increment() {
lock.lock()
defer { lock.unlock() }
value += 1
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return value
}
}```swift
protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let lock = NSLock()
init(value: Int) {
self.value = value
}
func increment() {
lock.lock()
defer { lock.unlock() }
value += 1
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return value
}
}
```init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounter'protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let lock = NSLock()
init(value: Int) {
self.value = value
}
func increment() {
lock.lock()
defer { lock.unlock() }
value += 1
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return value
}
}
class AtomicCounter: ThreadSafeCounterProtocol {
private var value: Int
init(value: Int) {
self.value = value
}
func increment() {
value += 1
}
func currentValue() -> Int {
return value
}
}```swift
protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let lock = NSLock()
init(value: Int) {
self.value = value
}
func increment() {
lock.lock()
defer { lock.unlock() }
value += 1
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return value
}
}
// Thread-safe counter with possibility to increment counter and access current value.
// Uses atomic operations for read and write operations.
class AtomicCounter: ThreadSafeCounterProtocol {
private var value: Int
init(value: Int) {
self.value = value
}
func increment() {
value += 1
}
func currentValue() -> Int {
return value
}
}
```init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ThreadSafeCounter'init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'AtomicCounter'protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<Output>: PipelineProtocol {
private var value: Output
private var next: Pipeline<Output>?
required init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
let next = Pipeline<U>(value: transform(value))
self.next = next
return next
}
func execute() -> Output {
return next?.execute() ?? value
}
}```swift
protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes.
// Ensure the final output is produced by sequentially applying transformations starting from an initial value.
class Pipeline<Output>: PipelineProtocol {
private var value: Output
private var next: Pipeline<Output>?
required init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
let next = Pipeline<U>(value: transform(value))
self.next = next
return next
}
func execute() -> Output {
return next?.execute() ?? value
}
}
// Usage
let pipeline = Pipeline(value: 1)
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 3 }
.pipe { $0 * 4 }
.pipe { $0 + 5 }
print(pipeline.execute()) // 41
```self.next = next // cannot assign value of type 'Pipeline<U>' to type 'Pipeline<Output>'protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<Output>: PipelineProtocol {
typealias Output = Output
private var value: Output
private var transforms: [Any] = []
init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
let pipeline = Pipeline<U>(value: transform(value))
transforms.append(pipeline)
return pipeline
}
func execute() -> Output {
return transforms.reduce(value) { $0 as! Pipeline<Output> }.value
}
}```swift
protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes.
// Ensure the final output is produced by sequentially applying transformations starting from an initial value.
class Pipeline<Output>: PipelineProtocol {
typealias Output = Output
private var value: Output
private var transforms: [Any] = []
init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
let pipeline = Pipeline<U>(value: transform(value))
transforms.append(pipeline)
return pipeline
}
func execute() -> Output {
return transforms.reduce(value) { $0 as! Pipeline<Output> }.value
}
}
// Example usage
let pipeline = Pipeline(value: 1)
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 - 1 }
.pipe { $0 * 2 }
print(pipeline.execute()) // prints 16
```init(value: Output) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'Pipeline<Output>'return transforms.reduce(value) { $0 as! Pipeline<Output> }.value // value of type 'Output' has no member 'value'return transforms.reduce(value) { $0 as! Pipeline<Output> }.value // cannot convert value of type 'Pipeline<Output>' to closure result type 'Output'return transforms.reduce(value) { $0 as! Pipeline<Output> }.value // contextual closure type '(Output, Any) throws -> Output' expects 2 arguments, but 1 was used in closure bodyprotocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<Output>: PipelineProtocol {
private var value: Output
private var transforms: [(Output) -> Output] = []
required init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
let pipeline = Pipeline<U>(value: transform(value))
pipeline.transforms = transforms
return pipeline
}
func execute() -> Output {
return transforms.reduce(value) { $1($0) }
}
}```swift
protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes.
// Ensure the final output is produced by sequentially applying transformations starting from an initial value.
class Pipeline<Output>: PipelineProtocol {
private var value: Output
private var transforms: [(Output) -> Output] = []
required init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
let pipeline = Pipeline<U>(value: transform(value))
pipeline.transforms = transforms
return pipeline
}
func execute() -> Output {
return transforms.reduce(value) { $1($0) }
}
}
// Example usage
let pipeline = Pipeline(value: 1)
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 3 }
.pipe { String($0) }
.execute()
print(pipeline) // "9"
```pipeline.transforms = transforms // cannot assign value of type '[(Output) -> Output]' to type '[(U) -> U]'protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<Output>: PipelineProtocol {
private var value: Output
private var transforms: [(Output) -> Output] = []
required init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
let pipeline = Pipeline<U>(value: transform(value))
pipeline.transforms = transforms
return pipeline
}
func execute() -> Output {
return transforms.reduce(value) { $1($0) }
}
}```swift
protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes.
// Ensure the final output is produced by sequentially applying transformations starting from an initial value.
class Pipeline<Output>: PipelineProtocol {
private var value: Output
private var transforms: [(Output) -> Output] = []
required init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
let pipeline = Pipeline<U>(value: transform(value))
pipeline.transforms = transforms
return pipeline
}
func execute() -> Output {
return transforms.reduce(value) { $1($0) }
}
}
// Example usage
let pipeline = Pipeline(value: 1)
.pipe { $0 * 2 }
.pipe { $0 * 3 }
.pipe { $0 * 4 }
.pipe { $0 * 5 }
print(pipeline.execute()) // prints 1200
```pipeline.transforms = transforms // cannot assign value of type '[(Output) -> Output]' to type '[(U) -> U]'protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<Output>: PipelineProtocol {
private var value: Output
private var transforms: [(Output) -> Output] = []
required init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
let pipeline = Pipeline<U>(value: transform(value))
pipeline.transforms = transforms
return pipeline
}
func execute() -> Output {
return transforms.reduce(value) { $1($0) }
}
}```swift
protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes.
// Ensure the final output is produced by sequentially applying transformations starting from an initial value.
class Pipeline<Output>: PipelineProtocol {
private var value: Output
private var transforms: [(Output) -> Output] = []
required init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
let pipeline = Pipeline<U>(value: transform(value))
pipeline.transforms = transforms
return pipeline
}
func execute() -> Output {
return transforms.reduce(value) { $1($0) }
}
}
// Example usage:
let pipeline = Pipeline(value: 1)
.pipe { $0 * 2 }
.pipe { $0 * 3 }
.pipe { $0 * 4 }
.pipe { $0 * 5 }
print(pipeline.execute()) // 1200
```pipeline.transforms = transforms // cannot assign value of type '[(Output) -> Output]' to type '[(U) -> U]'protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<Output>: PipelineProtocol {
private var value: Output
private var next: Pipeline<Output>?
required init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
let pipeline = Pipeline<U>(value: transform(value))
next = pipeline
return pipeline
}
func execute() -> Output {
return next?.execute() ?? value
}
}```swift
protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes.
// Ensure the final output is produced by sequentially applying transformations starting from an initial value.
class Pipeline<Output>: PipelineProtocol {
private var value: Output
private var next: Pipeline<Output>?
required init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
let pipeline = Pipeline<U>(value: transform(value))
next = pipeline
return pipeline
}
func execute() -> Output {
return next?.execute() ?? value
}
}
// Example usage:
let pipeline = Pipeline(value: 1)
.pipe { $0 * 2 }
.pipe { $0 * 3 }
.pipe { $0 * 4 }
.pipe { $0 * 5 }
print(pipeline.execute()) // prints 12000
```next = pipeline // cannot assign value of type 'Pipeline<U>' to type 'Pipeline<Output>'protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<Output>: PipelineProtocol {
typealias Output = Output
private var value: Output
private var transforms: [(Output) -> Output] = []
init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
let pipeline = Pipeline<U>(value: transform(value))
pipeline.transforms = transforms
return pipeline
}
func execute() -> Output {
return transforms.reduce(value) { $1($0) }
}
}```swift
protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes.
// Ensure the final output is produced by sequentially applying transformations starting from an initial value.
class Pipeline<Output>: PipelineProtocol {
typealias Output = Output
private var value: Output
private var transforms: [(Output) -> Output] = []
init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
let pipeline = Pipeline<U>(value: transform(value))
pipeline.transforms = transforms
return pipeline
}
func execute() -> Output {
return transforms.reduce(value) { $1($0) }
}
}
// Example usage
let pipeline = Pipeline(value: 1)
.pipe { $0 * 2 }
.pipe { $0 + 3 }
.pipe { $0 * 4 }
.pipe { $0 + 5 }
print(pipeline.execute()) // 34
```init(value: Output) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'Pipeline<Output>'pipeline.transforms = transforms // cannot assign value of type '[(Output) -> Output]' to type '[(U) -> U]'protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<Output>: PipelineProtocol {
private var value: Output
private var transforms: [(Output) -> Output] = []
required init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
let pipeline = Pipeline<U>(value: transform(value))
pipeline.transforms = transforms
return pipeline
}
func execute() -> Output {
return transforms.reduce(value) { $1($0) }
}
}```swift
protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes.
// Ensure the final output is produced by sequentially applying transformations starting from an initial value.
class Pipeline<Output>: PipelineProtocol {
private var value: Output
private var transforms: [(Output) -> Output] = []
required init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
let pipeline = Pipeline<U>(value: transform(value))
pipeline.transforms = transforms
return pipeline
}
func execute() -> Output {
return transforms.reduce(value) { $1($0) }
}
}
```pipeline.transforms = transforms // cannot assign value of type '[(Output) -> Output]' to type '[(U) -> U]'protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<Output>: PipelineProtocol {
private var value: Output
private var transforms: [(Output) -> Output] = []
init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
let pipeline = Pipeline<U>(value: transform(value))
pipeline.transforms = transforms
return pipeline
}
func execute() -> Output {
return transforms.reduce(value) { $1($0) }
}
}```swift
protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes.
// Ensure the final output is produced by sequentially applying transformations starting from an initial value.
class Pipeline<Output>: PipelineProtocol {
private var value: Output
private var transforms: [(Output) -> Output] = []
init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
let pipeline = Pipeline<U>(value: transform(value))
pipeline.transforms = transforms
return pipeline
}
func execute() -> Output {
return transforms.reduce(value) { $1($0) }
}
}
// Example usage
let pipeline = Pipeline(value: 1)
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 - 1 }
print(pipeline.execute()) // 4
```init(value: Output) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'Pipeline<Output>'pipeline.transforms = transforms // cannot assign value of type '[(Output) -> Output]' to type '[(U) -> U]'protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<Output>: PipelineProtocol {
private var value: Output
private var transforms: [(Output) -> Output] = []
required init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
let pipeline = Pipeline<U>(value: transform(value))
pipeline.transforms = transforms
return pipeline
}
func execute() -> Output {
return transforms.reduce(value) { $1($0) }
}
}```swift
protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes.
// Ensure the final output is produced by sequentially applying transformations starting from an initial value.
class Pipeline<Output>: PipelineProtocol {
private var value: Output
private var transforms: [(Output) -> Output] = []
required init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
let pipeline = Pipeline<U>(value: transform(value))
pipeline.transforms = transforms
return pipeline
}
func execute() -> Output {
return transforms.reduce(value) { $1($0) }
}
}
// Example usage
let pipeline = Pipeline(value: 1)
.pipe { $0 * 2 }
.pipe { $0 + 3 }
.pipe { String($0) }
.execute()
print(pipeline) // "5"
```pipeline.transforms = transforms // cannot assign value of type '[(Output) -> Output]' to type '[(U) -> U]'protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
class ObservableProperty<Value> {
private var observers: [UUID: (Value) -> Void] = [:]
private var value: Value
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
observer(value)
return uuid
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
func update(with newValue: Value) {
value = newValue
observers.values.forEach { $0(newValue) }
}
}```swift
protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
// Generic observable property that notifies observers of value changes.
class ObservableProperty<Value> {
private var observers: [UUID: (Value) -> Void] = [:]
private var value: Value
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
observer(value)
return uuid
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
func update(with newValue: Value) {
value = newValue
observers.values.forEach { $0(newValue) }
}
}
// Observable property that notifies observers of value changes.
class ObservableProperty<Value> {
private var observers: [UUID: (Value) -> Void] = [:]
private var value: Value
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
observer(value)
return uuid
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
func update(with newValue: Value) {
value = newValue
observers.values.forEach { $0(newValue) }
}
}
// Observable property that notifies observers of value changes.
class ObservableProperty<Value> {
private var observers: [UUID: (Value) -> Void] = [:]
private var value: Value
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
observer(value)
return uuid
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
func update(with newValue: Value) {
value = newValue
observers.values.forEach { $0(newValue) }
}
}
// Observable property that notifies observers of value changes.
class ObservableProperty<Value> {
private var observers: [UUID: (Value) -> Void] = [:]
private var value: Value
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
observer(value)
return uuid
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
func update(with newValue: Value) {
value = newValue
observers.values.forEach { $0(newValue) }
}
}
// Observable property that notifies observers of value changes.
class ObservableProperty<Value> {
private var observers: [UUID: (Value) -> Void] = [:]
private var value: Value
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
observer(value)
return uuid
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
func update(with newValue: Value) {
value = newValue
observers.values.forEach { $0(newValue) }
}
}
// Observable property that notifies observers of value changes.
class ObservableProperty<Value> {
private var observers: [UUID: (Value) -> Void] = [:]
private var value: Value
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
letobservable.value = 10 // 'value' is inaccessible due to 'private' protection levelobservable.value = 20 // 'value' is inaccessible due to 'private' protection levelobservable.value = 30 // 'value' is inaccessible due to 'private' protection levelprotocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
class ObservableProperty<Value> {
typealias Observer = (Value) -> Void
private var observers: [UUID: Observer] = [:]
private var value: Value
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping Observer) -> UUID {
let uuid = UUID()
observers[uuid] = observer
observer(value)
return uuid
}
func unsubscribe(_ uuid: UUID) {
observers[uuid] = nil
}
func setValue(_ value: Value) {
self.value = value
observers.values.forEach { $0(value) }
}
}```swift
protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
// Generic observable property that notifies observers of value changes.
class ObservableProperty<Value> {
typealias Observer = (Value) -> Void
private var observers: [UUID: Observer] = [:]
private var value: Value
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping Observer) -> UUID {
let uuid = UUID()
observers[uuid] = observer
observer(value)
return uuid
}
func unsubscribe(_ uuid: UUID) {
observers[uuid] = nil
}
func setValue(_ value: Value) {
self.value = value
observers.values.forEach { $0(value) }
}
}
```observable.value = 10 // 'value' is inaccessible due to 'private' protection levelobservable.value = 20 // 'value' is inaccessible due to 'private' protection levelobservable.value = 30 // 'value' is inaccessible due to 'private' protection levelprotocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
class ObservableProperty<Value> : ObservablePropertyProtocol {
typealias Value = Value
private var observers: [UUID: (Value) -> Void] = [:]
private var value: Value
init(value: Value) {
self.value = value
}
var value: Value {
get {
return self.value
}
set {
self.value = newValue
self.notifyObservers()
}
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
self.observers[uuid] = observer
return uuid
}
func unsubscribe(_ observer: UUID) {
self.observers[observer] = nil
}
private func notifyObservers() {
for (_, observer) in self.observers {
observer(self.value)
}
}
}```swift
protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
// Generic observable property that notifies observers of value changes.
class ObservableProperty<Value> : ObservablePropertyProtocol {
typealias Value = Value
private var observers: [UUID: (Value) -> Void] = [:]
private var value: Value
init(value: Value) {
self.value = value
}
var value: Value {
get {
return self.value
}
set {
self.value = newValue
self.notifyObservers()
}
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
self.observers[uuid] = observer
return uuid
}
func unsubscribe(_ observer: UUID) {
self.observers[observer] = nil
}
private func notifyObservers() {
for (_, observer) in self.observers {
observer(self.value)
}
}
}
```private var value: Value // property 'value' must be declared internal because it matches a requirement in internal protocol 'ObservablePropertyProtocol'init(value: Value) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ObservableProperty<Value>'var value: Value { // invalid redeclaration of 'value'protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
class ObservableProperty<Value> {
typealias Observer = (Value) -> Void
private var observers: [UUID: Observer] = [:]
private var value: Value
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping Observer) -> UUID {
let uuid = UUID()
observers[uuid] = observer
observer(value)
return uuid
}
func unsubscribe(_ uuid: UUID) {
observers[uuid] = nil
}
func update(with value: Value) {
self.value = value
observers.values.forEach { $0(value) }
}
}```swift
protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
// Generic observable property that notifies observers of value changes.
class ObservableProperty<Value> {
typealias Observer = (Value) -> Void
private var observers: [UUID: Observer] = [:]
private var value: Value
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping Observer) -> UUID {
let uuid = UUID()
observers[uuid] = observer
observer(value)
return uuid
}
func unsubscribe(_ uuid: UUID) {
observers[uuid] = nil
}
func update(with value: Value) {
self.value = value
observers.values.forEach { $0(value) }
}
}
// Concrete observable property that notifies observers of value changes.
class ObservableProperty<Value> {
typealias Observer = (Value) -> Void
private var observers: [UUID: Observer] = [:]
private var value: Value
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping Observer) -> UUID {
let uuid = UUID()
observers[uuid] = observer
observer(value)
return uuid
}
func unsubscribe(_ uuid: UUID) {
observers[uuid] = nil
}
func update(with value: Value) {
self.value = value
observers.values.forEach { $0(value) }
}
}
// Concrete observable property that notifies observers of value changes.
class ObservableProperty<Value> {
typealias Observer = (Value) -> Void
private var observers: [UUID: Observer] = [:]
private var value: Value
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping Observer) -> UUID {
let uuid = UUID()
observers[uuid] = observer
observer(value)
return uuid
}
func unsubscribe(_ uuid: UUID) {
observers[uuid] = nil
}
func update(with value: Value) {
self.value = value
observers.values.forEach { $0(value) }
}
}
// Concrete observable property that notifies observers of value changes.
class ObservableProperty<Value> {
typealias Observer = (Value) -> Void
private var observers: [UUID: Observer] = [:]
private var value: Value
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping Observer) -> UUID {
let uuid = UUID()
observers[uuid] = observer
observer(value)
return uuid
}
func unsubscribe(_ uuid: UUID) {
observers[uuid] = nil
}
func update(with value: Value) {
self.value = value
observers.values.forEach { $0(value) }
}
}
// Concrete observable property that notifies observers of value changes.
class ObservableProperty<Value> {
typealias Observer = (Value) -> Void
private var observers: [UUID: Observer] = [:]
private var value: Value
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping Observer) -> UUID {
let uuid = UUID()
observers[uuid] = observer
observer(value)
return uuid
}
func unsubscribe(_ uuid: UUID) {
observers[uuid] = nil
}
func update(with value: Value) {
self.value = value
observers.values.forEach { $0(value) }
}
}
// Concrete observable property that notifies observers of value changes.
class ObservableProperty<Value> {
typealias Observer = (Value) -> Void
private var observers: [UUID: Observer] = [:]
privateobservable.value = 10 // 'value' is inaccessible due to 'private' protection levelobservable.value = 20 // 'value' is inaccessible due to 'private' protection levelobservable.value = 30 // 'value' is inaccessible due to 'private' protection levelprotocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
class ObservableProperty<Value> {
typealias Observer = (Value) -> Void
private var observers = [UUID: Observer]()
private var value: Value
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping Observer) -> UUID {
let uuid = UUID()
observers[uuid] = observer
observer(value)
return uuid
}
func unsubscribe(_ uuid: UUID) {
observers[uuid] = nil
}
func update(with newValue: Value) {
value = newValue
for (_, observer) in observers {
observer(newValue)
}
}
}```swift
protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
// Generic observable property that notifies observers of value changes.
class ObservableProperty<Value> {
typealias Observer = (Value) -> Void
private var observers = [UUID: Observer]()
private var value: Value
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping Observer) -> UUID {
let uuid = UUID()
observers[uuid] = observer
observer(value)
return uuid
}
func unsubscribe(_ uuid: UUID) {
observers[uuid] = nil
}
func update(with newValue: Value) {
value = newValue
for (_, observer) in observers {
observer(newValue)
}
}
}
// Observable property that notifies observers of value changes.
class ObservableProperty<Value> {
typealias Observer = (Value) -> Void
private var observers = [UUID: Observer]()
private var value: Value
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping Observer) -> UUID {
let uuid = UUID()
observers[uuid] = observer
observer(value)
return uuid
}
func unsubscribe(_ uuid: UUID) {
observers[uuid] = nil
}
func update(with newValue: Value) {
value = newValue
for (_, observer) in observers {
observer(newValue)
}
}
}
// Observable property that notifies observers of value changes.
class ObservableProperty<Value> {
typealias Observer = (Value) -> Void
private var observers = [UUID: Observer]()
private var value: Value
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping Observer) -> UUID {
let uuid = UUID()
observers[uuid] = observer
observer(value)
return uuid
}
func unsubscribe(_ uuid: UUID) {
observers[uuid] = nil
}
func update(with newValue: Value) {
value = newValue
for (_, observer) in observers {
observer(newValue)
}
}
}
// Observable property that notifies observers of value changes.
class ObservableProperty<Value> {
typealias Observer = (Value) -> Void
private var observers = [UUID: Observer]()
private var value: Value
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping Observer) -> UUID {
let uuid = UUID()
observers[uuid] = observer
observer(value)
return uuid
}
func unsubscribe(_ uuid: UUID) {
observers[uuid] = nil
}
func update(with newValue: Value) {
value = newValue
for (_, observer) in observers {
observer(newValue)
}
}
}
// Observable property that notifies observers of value changes.
class ObservableProperty<Value> {
typealias Observer = (Value) -> Void
private var observers = [UUID: Observer]()
private var value: Value
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping Observer) -> UUID {
let uuid = UUID()
observers[uuid] = observer
observer(value)
return uuid
}
func unsubscribe(_ uuid: UUID) {
observers[uuid] = nil
}
func update(with newValue: Value) {
value = newValue
for (_, observer) in observers {
observer(newValue)
}
}
}
// Observable property that notifies observers of value changes.
class ObservableProperty<Value> {
typealias Observer = (Value) -> Void
private var observers = [UUID: Observer]()
observable.value = 10 // 'value' is inaccessible due to 'private' protection levelobservable.value = 20 // 'value' is inaccessible due to 'private' protection levelobservable.value = 30 // 'value' is inaccessible due to 'private' protection levelprotocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
class ObservableProperty<Value> {
typealias Observer = (Value) -> Void
private var observers: [UUID: Observer] = [:]
private var value: Value
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping Observer) -> UUID {
let uuid = UUID()
observers[uuid] = observer
observer(value)
return uuid
}
func unsubscribe(_ uuid: UUID) {
observers[uuid] = nil
}
func update(with newValue: Value) {
value = newValue
observers.values.forEach { $0(value) }
}
}
class Name: ObservablePropertyProtocol {
typealias Value = String
var value: String {
didSet {
observers.values.forEach { $0(value) }
}
}
private var observers: [UUID: (String) -> Void] = [:]
init(value: String) {
self.value = value
}
func subscribe(_ observer: @escaping (String) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
observer(value)
return uuid
}
func unsubscribe(_ uuid: UUID) {
observers[uuid] = nil
}
}
class Age: ObservablePropertyProtocol {
typealias Value = Int
var value: Int {
didSet {
observers.values.forEach { $0(value) }
}
}
private var observers: [UUID: (Int) -> Void] = [:]
init(value: Int) {
self.value = value
}
func subscribe(_ observer: @escaping (Int) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
observer(value)
return uuid
}
func unsubscribe(_ uuid: UUID) {
observers[uuid] = nil
}
}
class IsAdult: ObservablePropertyProtocol {
typealias Value = Bool
var value: Bool {
didSet {
observers.values.forEach { $0(value) }
}
}
private var observers: [UUID: (Bool) -> Void] = [:]
init(value: Bool) {
self.value = value
}
func subscribe(_ observer: @escaping (Bool) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
observer(value)
return uuid
}
func unsubscribe(_ uuid: UUID) {
observers[uuid] = nil
}
}
class Person: ObservablePropertyProtocol {
typealias Value = Person
var value: Person {
didSet {
observers.values.forEach { $0(value) }
}
}
private var observers: [UUID: (Person) -> Void] = [:]
init(value: Person) {
self.value = value
}
func subscribe(_ observer: @escaping (Person) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
observer(value)
return uuid
}
func unsubscribe(_ uuid: UUID) {
observers[uuid] = nil
}
}```swift
protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
// Generic observable property that notifies observers of value changes.
class ObservableProperty<Value> {
typealias Observer = (Value) -> Void
private var observers: [UUID: Observer] = [:]
private var value: Value
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping Observer) -> UUID {
let uuid = UUID()
observers[uuid] = observer
observer(value)
return uuid
}
func unsubscribe(_ uuid: UUID) {
observers[uuid] = nil
}
func update(with newValue: Value) {
value = newValue
observers.values.forEach { $0(value) }
}
}
// Concrete observable property that wraps a `String`.
class Name: ObservablePropertyProtocol {
typealias Value = String
var value: String {
didSet {
observers.values.forEach { $0(value) }
}
}
private var observers: [UUID: (String) -> Void] = [:]
init(value: String) {
self.value = value
}
func subscribe(_ observer: @escaping (String) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
observer(value)
return uuid
}
func unsubscribe(_ uuid: UUID) {
observers[uuid] = nil
}
}
// Concrete observable property that wraps an `Int`.
class Age: ObservablePropertyProtocol {
typealias Value = Int
var value: Int {
didSet {
observers.values.forEach { $0(value) }
}
}
private var observers: [UUID: (Int) -> Void] = [:]
init(value: Int) {
self.value = value
}
func subscribe(_ observer: @escaping (Int) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
observer(value)
return uuid
}
func unsubscribe(_ uuid: UUID) {
observers[uuid] = nil
}
}
// Concrete observable property that wraps a `Bool`.
class IsAdult: ObservablePropertyProtocol {
typealias Value = Bool
var value: Bool {
didSet {
observers.values.forEach { $0(value) }
}
}
private var observers: [UUID: (Bool) -> Void] = [:]
init(value: Bool) {
self.value = value
}
func subscribe(_ observer: @escaping (Bool) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
observer(value)
return uuid
}
func unsubscribe(_ uuid: UUID) {
observers[uuid] = nil
}
}
// Concrete observable property that wraps a `Person`.
class Person: ObservablePropertyProtocol {
typealias Value = Person
var value: Person {
didSet {
observers.values.forEach { $0(value) }
}
}
private var observers: [UUID: (Person) -> Void] = [:]
init(value: Person) {
self.value = value
}
func subscribe(_ observer: @escaping (Person) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
observer(value)
return uuid
}
func unsubscribe(_ uuid: UUID) {
observers[uuid] = nil
}
}
// Concrete observable property that wraps a `Person`.
class Address: ObservablePropertyProtocol {
typealias Value = Address
var value: Address {
didSet {
observers.values.forEach { $0(value) }
}
}
private var observers: [UUID: (Address) -> Void] = [:]
init(value: Address) {
self.value = value
}
init(value: String) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'Name'init(value: Int) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'Age'init(value: Bool) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'IsAdult'init(value: Person) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'Person'observable.value = 10 // 'value' is inaccessible due to 'private' protection levelobservable.value = 20 // 'value' is inaccessible due to 'private' protection levelobservable.value = 30 // 'value' is inaccessible due to 'private' protection levelprotocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
class ObservableProperty<Value> : ObservablePropertyProtocol {
typealias Value = Value
private var observers: [UUID: (Value) -> Void] = [:]
private var value: Value
init(value: Value) {
self.value = value
}
var value: Value {
get { return self.value }
set {
self.value = newValue
self.notifyObservers()
}
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
self.observers[uuid] = observer
return uuid
}
func unsubscribe(_ observer: UUID) {
self.observers[observer] = nil
}
private func notifyObservers() {
for (_, observer) in self.observers {
observer(self.value)
}
}
}```swift
protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
// Generic observable property that notifies observers of value changes.
class ObservableProperty<Value> : ObservablePropertyProtocol {
typealias Value = Value
private var observers: [UUID: (Value) -> Void] = [:]
private var value: Value
init(value: Value) {
self.value = value
}
var value: Value {
get { return self.value }
set {
self.value = newValue
self.notifyObservers()
}
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
self.observers[uuid] = observer
return uuid
}
func unsubscribe(_ observer: UUID) {
self.observers[observer] = nil
}
private func notifyObservers() {
for (_, observer) in self.observers {
observer(self.value)
}
}
}
```private var value: Value // property 'value' must be declared internal because it matches a requirement in internal protocol 'ObservablePropertyProtocol'init(value: Value) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ObservableProperty<Value>'var value: Value { // invalid redeclaration of 'value'protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
class ObservableProperty<Value> : ObservablePropertyProtocol {
typealias Value = Value
private var observers: [UUID: (Value) -> Void] = [:]
private(set) var value: Value
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
observer(value)
return uuid
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
func update(with newValue: Value) {
value = newValue
observers.values.forEach { $0(newValue) }
}
}```swift
protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
// Generic observable property that notifies observers of value changes.
class ObservableProperty<Value> : ObservablePropertyProtocol {
typealias Value = Value
private var observers: [UUID: (Value) -> Void] = [:]
private(set) var value: Value
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
observer(value)
return uuid
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
func update(with newValue: Value) {
value = newValue
observers.values.forEach { $0(newValue) }
}
}
// Observable property that notifies observers of value changes.
class ObservableProperty<Value> : ObservablePropertyProtocol {
typealias Value = Value
private var observers: [UUID: (Value) -> Void] = [:]
private(set) var value: Value
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
observer(value)
return uuid
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
func update(with newValue: Value) {
value = newValue
observers.values.forEach { $0(newValue) }
}
}
// Observable property that notifies observers of value changes.
class ObservableProperty<Value> : ObservablePropertyProtocol {
typealias Value = Value
private var observers: [UUID: (Value) -> Void] = [:]
private(set) var value: Value
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
observer(value)
return uuid
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
func update(with newValue: Value) {
value = newValue
observers.values.forEach { $0(newValue) }
}
}
// Observable property that notifies observers of value changes.
class ObservableProperty<Value> : ObservablePropertyProtocol {
typealias Value = Value
private var observers: [UUID: (Value) -> Void] = [:]
private(set) var value: Value
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
observer(value)
return uuid
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
func update(with newValue: Value) {
value = newValue
observers.values.forEach { $0(newValue) }
}
}
// Observable property that notifies observers of value changes.
class ObservableProperty<Value> : ObservablePropertyProtocol {
typealias Value = Value
private var observers: [UUID: (Value) -> Void] = [:]
private(set) var value: Value
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
observer(value)
return uuid
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
func update(with newValue: Value) {
value = newValue
observers.values.forEach { $0(newValue) }
}
}
// Observable property that notifies observers of value changes.
class ObservableProperty<Value> : ObservablePropertyProtocolprivate(set) var value: Value // setter for property 'value' must be declared internal because it matches a requirement in internal protocol 'ObservablePropertyProtocol'init(value: Value) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ObservableProperty<Value>'protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
class ObservableProperty<Value> {
typealias Observer = (Value) -> Void
private var observers = [UUID: Observer]()
private var value: Value
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping Observer) -> UUID {
let uuid = UUID()
observers[uuid] = observer
observer(value)
return uuid
}
func unsubscribe(_ uuid: UUID) {
observers[uuid] = nil
}
func update(with newValue: Value) {
value = newValue
observers.values.forEach { $0(newValue) }
}
}
class ObservableString: ObservableProperty<String> {
override func update(with newValue: String) {
value = newValue
observers.values.forEach { $0(newValue) }
}
}
class ObservableBool: ObservableProperty<Bool> {
override func update(with newValue: Bool) {
value = newValue
observers.values.forEach { $0(newValue) }
}
}
class ObservableInt: ObservableProperty<Int> {
override func update(with newValue: Int) {
value = newValue
observers.values.forEach { $0(newValue) }
}
}
class ObservableDouble: ObservableProperty<Double> {
override func update(with newValue: Double) {
value = newValue
observers.values.forEach { $0(newValue) }
}
}
class ObservableFloat: ObservableProperty<Float> {
override func update(with newValue: Float) {
value = newValue
observers.values.forEach { $0(newValue) }
}
}
class ObservableCGFloat: ObservableProperty<CGFloat> {
override func update(with newValue: CGFloat) {
value = newValue
observers.values.forEach { $0(newValue) }
}
}
class ObservableCGPoint: ObservableProperty<CGPoint> {
override func update(with newValue: CGPoint) {
value = newValue
observers.values.forEach { $0(newValue) }
}
}
class ObservableCGSize: ObservableProperty<CGSize> {
override func update(with newValue: CGSize) {
value = newValue
observers.values.forEach { $0(newValue) }
}
}
class ObservableCGRect: ObservableProperty<CGRect> {
override func update(with newValue: CGRect) {
value = newValue
observers.values.forEach { $0(newValue) }
}
}
class ObservableUIColor: ObservableProperty<UIColor> {
override func update(with newValue: UIColor) {
value = newValue
observers.values.forEach { $0(newValue) }
}
}
class ObservableUIImage: ObservableProperty<UIImage> {
override func update(with newValue: UIImage) {
value = newValue
observers.values.forEach { $0(newValue) }
}
}
class ObservableUIFont: ObservableProperty<UIFont> {
override func update(with newValue: UIFont) {
value = newValue
observers.values.forEach { $0(newValue) }
}
}```swift
protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
// Generic observable property that notifies observers of value changes.
class ObservableProperty<Value> {
typealias Observer = (Value) -> Void
private var observers = [UUID: Observer]()
private var value: Value
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping Observer) -> UUID {
let uuid = UUID()
observers[uuid] = observer
observer(value)
return uuid
}
func unsubscribe(_ uuid: UUID) {
observers[uuid] = nil
}
func update(with newValue: Value) {
value = newValue
observers.values.forEach { $0(newValue) }
}
}
// Concrete observable property that wraps a `String`.
class ObservableString: ObservableProperty<String> {
override func update(with newValue: String) {
value = newValue
observers.values.forEach { $0(newValue) }
}
}
// Concrete observable property that wraps a `Bool`.
class ObservableBool: ObservableProperty<Bool> {
override func update(with newValue: Bool) {
value = newValue
observers.values.forEach { $0(newValue) }
}
}
// Concrete observable property that wraps an `Int`.
class ObservableInt: ObservableProperty<Int> {
override func update(with newValue: Int) {
value = newValue
observers.values.forEach { $0(newValue) }
}
}
// Concrete observable property that wraps a `Double`.
class ObservableDouble: ObservableProperty<Double> {
override func update(with newValue: Double) {
value = newValue
observers.values.forEach { $0(newValue) }
}
}
// Concrete observable property that wraps a `Float`.
class ObservableFloat: ObservableProperty<Float> {
override func update(with newValue: Float) {
value = newValue
observers.values.forEach { $0(newValue) }
}
}
// Concrete observable property that wraps a `CGFloat`.
class ObservableCGFloat: ObservableProperty<CGFloat> {
override func update(with newValue: CGFloat) {
value = newValue
observers.values.forEach { $0(newValue) }
}
}
// Concrete observable property that wraps a `CGPoint`.
class ObservableCGPoint: ObservableProperty<CGPoint> {
override func update(with newValue: CGPoint) {
value = newValue
observers.values.forEach { $0(newValue) }
}
}
// Concrete observable property that wraps a `CGSize`.
class ObservableCGSize: ObservableProperty<CGSize> {
override func update(with newValue: CGSize) {
value = newValue
observers.values.forEach { $0(newValue) }
}
}
// Concrete observable property that wraps a `CGRect`.
class ObservableCGRect: ObservableProperty<CGRect> {
override func update(with newValue: CGRect) {
value = newValue
observers.values.forEach { $0(newValue) }
}
}
// Concrete observable property that wraps a `UIColor`.
class ObservableUIColor: ObservableProperty<UIColor> {
override func update(with newValue: UIColor) {
value = newValue
observers.values.forEach { $0(newValue) }
}
}
// Concrete observable property that wraps a `UIImage`.
class ObservableUIImage: ObservableProperty<UIImage> {
override func update(with newValue: UIImage) {
value = newValue
observers.values.forEach { $0(newValue) }
}
}
// Concrete observable property that wraps a `UIFont`.
class ObservableUIFont: ObservableProperty<UIFont> {
override func update(with newValue: UIFont) {
value = newValue
observers.values.forEach { $0(newValue) }
}
}
// Concrete observable property that wraps a `UIEdgeInsets`.
class ObservableUIEdgeInsets: ObservableProperty<UIEdgeInsets> {
override func update(with newValue: UIEdgeInsetsvalue = newValue // 'value' is inaccessible due to 'private' protection levelobservers.values.forEach { $0(newValue) } // 'observers' is inaccessible due to 'private' protection levelvalue = newValue // 'value' is inaccessible due to 'private' protection levelobservers.values.forEach { $0(newValue) } // 'observers' is inaccessible due to 'private' protection levelvalue = newValue // 'value' is inaccessible due to 'private' protection levelobservers.values.forEach { $0(newValue) } // 'observers' is inaccessible due to 'private' protection levelvalue = newValue // 'value' is inaccessible due to 'private' protection levelobservers.values.forEach { $0(newValue) } // 'observers' is inaccessible due to 'private' protection levelvalue = newValue // 'value' is inaccessible due to 'private' protection levelobservers.values.forEach { $0(newValue) } // 'observers' is inaccessible due to 'private' protection levelvalue = newValue // 'value' is inaccessible due to 'private' protection levelobservers.values.forEach { $0(newValue) } // 'observers' is inaccessible due to 'private' protection levelvalue = newValue // 'value' is inaccessible due to 'private' protection levelobservers.values.forEach { $0(newValue) } // 'observers' is inaccessible due to 'private' protection levelvalue = newValue // 'value' is inaccessible due to 'private' protection levelobservers.values.forEach { $0(newValue) } // 'observers' is inaccessible due to 'private' protection levelvalue = newValue // 'value' is inaccessible due to 'private' protection levelobservers.values.forEach { $0(newValue) } // 'observers' is inaccessible due to 'private' protection levelclass ObservableUIColor: ObservableProperty<UIColor> { // cannot find type 'UIColor' in scopeoverride func update(with newValue: UIColor) { // cannot find type 'UIColor' in scopeoverride func update(with newValue: UIColor) { // method does not override any method from its superclassvalue = newValue // 'value' is inaccessible due to 'private' protection levelobservers.values.forEach { $0(newValue) } // 'observers' is inaccessible due to 'private' protection levelclass ObservableUIImage: ObservableProperty<UIImage> { // cannot find type 'UIImage' in scopeoverride func update(with newValue: UIImage) { // method does not override any method from its superclassoverride func update(with newValue: UIImage) { // cannot find type 'UIImage' in scopevalue = newValue // 'value' is inaccessible due to 'private' protection levelobservers.values.forEach { $0(newValue) } // 'observers' is inaccessible due to 'private' protection levelclass ObservableUIFont: ObservableProperty<UIFont> { // cannot find type 'UIFont' in scopeoverride func update(with newValue: UIFont) { // method does not override any method from its superclassoverride func update(with newValue: UIFont) { // cannot find type 'UIFont' in scopevalue = newValue // 'value' is inaccessible due to 'private' protection levelobservers.values.forEach { $0(newValue) } // 'observers' is inaccessible due to 'private' protection levelobservable.value = 10 // 'value' is inaccessible due to 'private' protection levelobservable.value = 20 // 'value' is inaccessible due to 'private' protection levelobservable.value = 30 // 'value' is inaccessible due to 'private' protection levelprotocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
class ObservableProperty<Value> {
private var observers: [UUID: (Value) -> Void] = [:]
private(set) var value: Value
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
observer(value)
return uuid
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
func update(with newValue: Value) {
value = newValue
observers.values.forEach { $0(value) }
}
}
class ObservableString: ObservablePropertyProtocol {
typealias Value = String
private let observableProperty: ObservableProperty<Value>
init(value: Value) {
observableProperty = ObservableProperty(value: value)
}
var value: Value {
get { observableProperty.value }
set { observableProperty.update(with: newValue) }
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
return observableProperty.subscribe(observer)
}
func unsubscribe(_ observer: UUID) {
observableProperty.unsubscribe(observer)
}
}
class ObservableInt: ObservablePropertyProtocol {
typealias Value = Int
private let observableProperty: ObservableProperty<Value>
init(value: Value) {
observableProperty = ObservableProperty(value: value)
}
var value: Value {
get { observableProperty.value }
set { observableProperty.update(with: newValue) }
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
return observableProperty.subscribe(observer)
}
func unsubscribe(_ observer: UUID) {
observableProperty.unsubscribe(observer)
}
}```swift
protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
// Generic observable property that notifies observers of value changes.
class ObservableProperty<Value> {
private var observers: [UUID: (Value) -> Void] = [:]
private(set) var value: Value
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
observer(value)
return uuid
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
func update(with newValue: Value) {
value = newValue
observers.values.forEach { $0(value) }
}
}
// Concrete observable property that wraps a `String`.
class ObservableString: ObservablePropertyProtocol {
typealias Value = String
private let observableProperty: ObservableProperty<Value>
init(value: Value) {
observableProperty = ObservableProperty(value: value)
}
var value: Value {
get { observableProperty.value }
set { observableProperty.update(with: newValue) }
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
return observableProperty.subscribe(observer)
}
func unsubscribe(_ observer: UUID) {
observableProperty.unsubscribe(observer)
}
}
// Concrete observable property that wraps an `Int`.
class ObservableInt: ObservablePropertyProtocol {
typealias Value = Int
private let observableProperty: ObservableProperty<Value>
init(value: Value) {
observableProperty = ObservableProperty(value: value)
}
var value: Value {
get { observableProperty.value }
set { observableProperty.update(with: newValue) }
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
return observableProperty.subscribe(observer)
}
func unsubscribe(_ observer: UUID) {
observableProperty.unsubscribe(observer)
}
}
```init(value: Value) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ObservableString'init(value: Value) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ObservableInt'observable.value = 10 // cannot assign to property: 'value' setter is inaccessibleobservable.value = 20 // cannot assign to property: 'value' setter is inaccessibleobservable.value = 30 // cannot assign to property: 'value' setter is inaccessibleprotocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<T: Comparable>: ClampedProtocol {
var wrappedValue: T
let range: ClosedRange<T>
init(wrappedValue: T, _ range: ClosedRange<T>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: T {
get { wrappedValue }
set { wrappedValue = clamp(newValue, to: range) }
}
}```swift
protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<T: Comparable>: ClampedProtocol {
var wrappedValue: T
let range: ClosedRange<T>
init(wrappedValue: T, _ range: ClosedRange<T>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: T {
get { wrappedValue }
set { wrappedValue = clamp(newValue, to: range) }
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<T: Comparable>: ClampedProtocol {
var wrappedValue: T
let range: ClosedRange<T>
init(wrappedValue: T, _ range: ClosedRange<T>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: T {
get { wrappedValue }
set { wrappedValue = clamp(newValue, to: range) }
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<T: Comparable>: ClampedProtocol {
var wrappedValue: T
let range: ClosedRange<T>
init(wrappedValue: T, _ range: ClosedRange<T>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: T {
get { wrappedValue }
set { wrappedValue = clamp(newValue, to: range) }
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<T: Comparable>: ClampedProtocol {
var wrappedValue: T
let range: ClosedRange<T>
init(wrappedValue: T, _ range: ClosedRange<T>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: T {
get { wrappedValue }
set { wrappedValue = clamp(newValue, to: range) }
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<T: Comparable>: ClampedProtocol {
var wrappedValue: T
let range: ClosedRange<T>
init(wrappedValue: T, _ range: ClosedRange<T>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: T {
get { wrappedValue }
set { wrappedValue = clamp(newValue, to: range) }
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<T: Comparable>: ClampedProtocol {
var wrappedValue: T
let range: ClosedRange<T>
init(wrappedValue: T, _ range: ClosedRange<T>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: T {
get { wrappedValue }
set { wrappedValue = clamp(newValue, to: range) }
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<T: Comparable>: ClampedProtocol {
var wrappedValue: T
let range: ClosedRange<T>
init(wrappedValue: T, _ range: ClosedRange<T>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: T {
get { wrappedValue }
set { wrappedValue = clamp(newValue, to: range) }
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<T: Comparable>: ClampedProtocol {
var wrappedValue: T
let range: ClosedRange<T>
init(wrappedValue: T, _ range: ClosedRange<T>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue:set { wrappedValue = clamp(newValue, to: range) } // cannot find 'clamp' in scopeprotocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue
self.range = range
}
init(wrappedValue: Value) where Value: Comparable {
self.init(wrappedValue: wrappedValue, 0...1)
}
var projectedValue: Clamped<Value> {
get { self }
set { self = newValue }
}
}```swift
protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue
self.range = range
}
init(wrappedValue: Value) where Value: Comparable {
self.init(wrappedValue: wrappedValue, 0...1)
}
var projectedValue: Clamped<Value> {
get { self }
set { self = newValue }
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue
self.range = range
}
init(wrappedValue: Value) where Value: Comparable {
self.init(wrappedValue: wrappedValue, 0...1)
}
var projectedValue: Clamped<Value> {
get { self }
set { self = newValue }
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue
self.range = range
}
init(wrappedValue: Value) where Value: Comparable {
self.init(wrappedValue: wrappedValue, 0...1)
}
var projectedValue: Clamped<Value> {
get { self }
set { self = newValue }
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue
self.range = range
}
init(wrappedValue: Value) where Value: Comparable {
self.init(wrappedValue: wrappedValue, 0...1)
}
var projectedValue: Clamped<Value> {
get { self }
set { self = newValue }
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue
self.range = range
}
init(wrappedValue: Value) where Value: Comparable {
self.init(wrappedValue: wrappedValue, 0...1)
}
var projectedValue: Clamped<Value> {
get { self }
set { self = newValue }
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue
self.range = range
}
init(wrappedValue: Value) where Value: Comparable {
self.init(wrappedValue: wrappedValue, 0...1)
}
var projectedValue: Clamped<Value> {
get { self }
set { self = newValue }
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparableself.init(wrappedValue: wrappedValue, 0...1) // cannot convert value of type 'Int' to expected argument type 'Value'self.init(wrappedValue: wrappedValue, 0...1) // cannot convert value of type 'Int' to expected argument type 'Value'protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: Clamped<Value> {
get { self }
set { self = newValue }
}
}```swift
protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: Clamped<Value> {
get { self }
set { self = newValue }
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: Clamped<Value> {
get { self }
set { self = newValue }
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: Clamped<Value> {
get { self }
set { self = newValue }
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: Clamped<Value> {
get { self }
set { self = newValue }
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: Clamped<Value> {
get { self }
set { self = newValue }
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: Clamped<Value> {
get { self }
set { self = newValue }
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: Clamped<Value> {
get { self }
set { self = newValue }
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: Clamped<Value> {
get { self }
set { self = newValue }
}
}
// Property wrapper that clamps // XCTAssertEqual failed: (15) is not equal to (10)protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: Clamped<Value> {
get { self }
set { self = newValue }
}
func clamped(to range: ClosedRange<Value>) -> Clamped<Value> {
Clamped(wrappedValue: Swift.max(range.lowerBound, Swift.min(range.upperBound, wrappedValue)), range)
}
}```swift
protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: Clamped<Value> {
get { self }
set { self = newValue }
}
func clamped(to range: ClosedRange<Value>) -> Clamped<Value> {
Clamped(wrappedValue: Swift.max(range.lowerBound, Swift.min(range.upperBound, wrappedValue)), range)
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: Clamped<Value> {
get { self }
set { self = newValue }
}
func clamped(to range: ClosedRange<Value>) -> Clamped<Value> {
Clamped(wrappedValue: Swift.max(range.lowerBound, Swift.min(range.upperBound, wrappedValue)), range)
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: Clamped<Value> {
get { self }
set { self = newValue }
}
func clamped(to range: ClosedRange<Value>) -> Clamped<Value> {
Clamped(wrappedValue: Swift.max(range.lowerBound, Swift.min(range.upperBound, wrappedValue)), range)
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: Clamped<Value> {
get { self }
set { self = newValue }
}
func clamped(to range: ClosedRange<Value>) -> Clamped<Value> {
Clamped(wrappedValue: Swift.max(range.lowerBound, Swift.min(range.upperBound, wrappedValue)), range)
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: Clamped<Value> {
get { self }
set { self = newValue }
}
func clamped(to range: ClosedRange<Value>) -> Clamped<Value> {
Clamped(wrappedValue: Swift.max(range.lowerBound, Swift.min(range.upperBound, wrappedValue)), range)
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue
self // XCTAssertEqual failed: (15) is not equal to (10)protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<T: Comparable>: ClampedProtocol {
var wrappedValue: T
let range: ClosedRange<T>
init(wrappedValue: T, _ range: ClosedRange<T>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: T {
get { wrappedValue }
set { wrappedValue = clamp(newValue, to: range) }
}
}```swift
protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<T: Comparable>: ClampedProtocol {
var wrappedValue: T
let range: ClosedRange<T>
init(wrappedValue: T, _ range: ClosedRange<T>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: T {
get { wrappedValue }
set { wrappedValue = clamp(newValue, to: range) }
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<T: Comparable>: ClampedProtocol {
var wrappedValue: T
let range: ClosedRange<T>
init(wrappedValue: T, _ range: ClosedRange<T>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: T {
get { wrappedValue }
set { wrappedValue = clamp(newValue, to: range) }
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<T: Comparable>: ClampedProtocol {
var wrappedValue: T
let range: ClosedRange<T>
init(wrappedValue: T, _ range: ClosedRange<T>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: T {
get { wrappedValue }
set { wrappedValue = clamp(newValue, to: range) }
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<T: Comparable>: ClampedProtocol {
var wrappedValue: T
let range: ClosedRange<T>
init(wrappedValue: T, _ range: ClosedRange<T>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: T {
get { wrappedValue }
set { wrappedValue = clamp(newValue, to: range) }
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<T: Comparable>: ClampedProtocol {
var wrappedValue: T
let range: ClosedRange<T>
init(wrappedValue: T, _ range: ClosedRange<T>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: T {
get { wrappedValue }
set { wrappedValue = clamp(newValue, to: range) }
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<T: Comparable>: ClampedProtocol {
var wrappedValue: T
let range: ClosedRange<T>
init(wrappedValue: T, _ range: ClosedRange<T>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: T {
get { wrappedValue }
set { wrappedValue = clamp(newValue, to: range) }
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<T: Comparable>: ClampedProtocol {
var wrappedValue: T
let range: ClosedRange<T>
init(wrappedValue: T, _ range: ClosedRange<T>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: T {
get { wrappedValue }
set { wrappedValue = clamp(newValue, to: range) }
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<T: Comparable>: ClampedProtocol {
var wrappedValue: T
let range: ClosedRange<T>
init(wrappedValue: T, _ range: ClosedRange<T>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue:set { wrappedValue = clamp(newValue, to: range) } // cannot find 'clamp' in scopeprotocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue
self.range = range
}
init(wrappedValue: Value) where Value: Comparable {
self.init(wrappedValue: wrappedValue, 0...1)
}
var projectedValue: Clamped<Value> {
get { self }
set { self = newValue }
}
}```swift
protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue
self.range = range
}
init(wrappedValue: Value) where Value: Comparable {
self.init(wrappedValue: wrappedValue, 0...1)
}
var projectedValue: Clamped<Value> {
get { self }
set { self = newValue }
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue
self.range = range
}
init(wrappedValue: Value) where Value: Comparable {
self.init(wrappedValue: wrappedValue, 0...1)
}
var projectedValue: Clamped<Value> {
get { self }
set { self = newValue }
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue
self.range = range
}
init(wrappedValue: Value) where Value: Comparable {
self.init(wrappedValue: wrappedValue, 0...1)
}
var projectedValue: Clamped<Value> {
get { self }
set { self = newValue }
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue
self.range = range
}
init(wrappedValue: Value) where Value: Comparable {
self.init(wrappedValue: wrappedValue, 0...1)
}
var projectedValue: Clamped<Value> {
get { self }
set { self = newValue }
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue
self.range = range
}
init(wrappedValue: Value) where Value: Comparable {
self.init(wrappedValue: wrappedValue, 0...1)
}
var projectedValue: Clamped<Value> {
get { self }
set { self = newValue }
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue
self.range = range
}
init(wrappedValue: Value) where Value: Comparable {
self.init(wrappedValue: wrappedValue, 0...1)
}
var projectedValue: Clamped<Value> {
get { self }
set { self = newValue }
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparableself.init(wrappedValue: wrappedValue, 0...1) // cannot convert value of type 'Int' to expected argument type 'Value'self.init(wrappedValue: wrappedValue, 0...1) // cannot convert value of type 'Int' to expected argument type 'Value'protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: Clamped { self }
}```swift
protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: Clamped { self }
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: Clamped { self }
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: Clamped { self }
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: Clamped { self }
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: Clamped { self }
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: Clamped { self }
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: Clamped { self }
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: Clamped { self }
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: Clamped { self }
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange // XCTAssertEqual failed: (15) is not equal to (10)protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<T: Comparable>: ClampedProtocol {
var wrappedValue: T
let range: ClosedRange<T>
init(wrappedValue: T, _ range: ClosedRange<T>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: Clamped<T> {
get { self }
set { self = newValue }
}
func clamped(to range: ClosedRange<T>) -> T {
return min(max(wrappedValue, range.lowerBound), range.upperBound)
}
func clamped(to range: ClosedRange<T>) -> Clamped {
return Clamped(wrappedValue: clamped(to: range), range)
}
}```swift
protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<T: Comparable>: ClampedProtocol {
var wrappedValue: T
let range: ClosedRange<T>
init(wrappedValue: T, _ range: ClosedRange<T>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: Clamped<T> {
get { self }
set { self = newValue }
}
func clamped(to range: ClosedRange<T>) -> T {
return min(max(wrappedValue, range.lowerBound), range.upperBound)
}
func clamped(to range: ClosedRange<T>) -> Clamped {
return Clamped(wrappedValue: clamped(to: range), range)
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<T: Comparable>: ClampedProtocol {
var wrappedValue: T
let range: ClosedRange<T>
init(wrappedValue: T, _ range: ClosedRange<T>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: Clamped<T> {
get { self }
set { self = newValue }
}
func clamped(to range: ClosedRange<T>) -> T {
return min(max(wrappedValue, range.lowerBound), range.upperBound)
}
func clamped(to range: ClosedRange<T>) -> Clamped {
return Clamped(wrappedValue: clamped(to: range), range)
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<T: Comparable>: ClampedProtocol {
var wrappedValue: T
let range: ClosedRange<T>
init(wrappedValue: T, _ range: ClosedRange<T>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: Clamped<T> {
get { self }
set { self = newValue }
}
func clamped(to range: ClosedRange<T>) -> T {
return min(max(wrappedValue, range.lowerBound), range.upperBound)
}
func clamped(to range: ClosedRange<T>) -> Clamped {
return Clamped(wrappedValue: clamped(to: range), range)
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<T: Comparable>: ClampedProtocol {
var wrappedValue: T
let range: ClosedRange<T>
init(wrappedValue: T, _ range: ClosedRange<T>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: Clamped<T> {
get { self }
set { self = newValue }
}
func clamped(to range: ClosedRange<T>) -> T {
return min(max(wrappedValue, range.lowerBound), range.upperBound)
}
func clamped(to range: ClosedRange<T>) -> Clamped {
return Clamped(wrappedValue: clamped(to: range), range)
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<T: Comparable>: ClampedProtocol {
var wrappedValue: T
let range: ClosedRange<T>
init(wrappedValue: T, _ range: ClosedRange<T>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: Clamped<T> {
get { self }
set { self = newValue }
}
func clamped(to range: ClosedRange<T>) -> T {
return min(max(wrappedValue, // XCTAssertEqual failed: (15) is not equal to (10)protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: Clamped<Value> {
get { self }
set { self = newValue }
}
}```swift
protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: Clamped<Value> {
get { self }
set { self = newValue }
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: Clamped<Value> {
get { self }
set { self = newValue }
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: Clamped<Value> {
get { self }
set { self = newValue }
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: Clamped<Value> {
get { self }
set { self = newValue }
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: Clamped<Value> {
get { self }
set { self = newValue }
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: Clamped<Value> {
get { self }
set { self = newValue }
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: Clamped<Value> {
get { self }
set { self = newValue }
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: Clamped<Value> {
get { self }
set { self = newValue }
}
}
// Property wrapper that clamps // XCTAssertEqual failed: (15) is not equal to (10)protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: Clamped<Value> {
get { self }
set { self = newValue }
}
func clamped(to range: ClosedRange<Value>) -> Clamped<Value> {
Clamped(wrappedValue: Swift.max(range.lowerBound, Swift.min(range.upperBound, wrappedValue)), range)
}
}```swift
protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: Clamped<Value> {
get { self }
set { self = newValue }
}
func clamped(to range: ClosedRange<Value>) -> Clamped<Value> {
Clamped(wrappedValue: Swift.max(range.lowerBound, Swift.min(range.upperBound, wrappedValue)), range)
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: Clamped<Value> {
get { self }
set { self = newValue }
}
func clamped(to range: ClosedRange<Value>) -> Clamped<Value> {
Clamped(wrappedValue: Swift.max(range.lowerBound, Swift.min(range.upperBound, wrappedValue)), range)
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: Clamped<Value> {
get { self }
set { self = newValue }
}
func clamped(to range: ClosedRange<Value>) -> Clamped<Value> {
Clamped(wrappedValue: Swift.max(range.lowerBound, Swift.min(range.upperBound, wrappedValue)), range)
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: Clamped<Value> {
get { self }
set { self = newValue }
}
func clamped(to range: ClosedRange<Value>) -> Clamped<Value> {
Clamped(wrappedValue: Swift.max(range.lowerBound, Swift.min(range.upperBound, wrappedValue)), range)
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: Clamped<Value> {
get { self }
set { self = newValue }
}
func clamped(to range: ClosedRange<Value>) -> Clamped<Value> {
Clamped(wrappedValue: Swift.max(range.lowerBound, Swift.min(range.upperBound, wrappedValue)), range)
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue
self // XCTAssertEqual failed: (15) is not equal to (10)enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<Value>: LoggedProtocol {
var wrappedValue: Value
let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Logged<Value> {
get { self }
set { self = newValue }
}
}
struct User {
@Logged(logger: { print($0, $1) })
var name: String
}```swift
enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value>: LoggedProtocol {
var wrappedValue: Value
let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Logged<Value> {
get { self }
set { self = newValue }
}
}
struct User {
@Logged(logger: { print($0, $1) })
var name: String
}
let user = User(name: "John")
user.name = "Jane"
print(user.name)
// Prints: get "John"
// Prints: set "Jane"
```@Logged(logger: { print($0, $1) }) // missing argument for parameter 'wrappedValue' in callenum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<Value>: LoggedProtocol {
var wrappedValue: Value
let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Logged { self }
subscript<T>(dynamicMember keyPath: WritableKeyPath<Value, T>) -> T {
get {
logger(.get, wrappedValue[keyPath: keyPath])
return wrappedValue[keyPath: keyPath]
}
set {
logger(.set, newValue)
wrappedValue[keyPath: keyPath] = newValue
}
}
}
struct User {
@Logged var name: String
@Logged var age: Int
}```swift
enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value>: LoggedProtocol {
var wrappedValue: Value
let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Logged { self }
subscript<T>(dynamicMember keyPath: WritableKeyPath<Value, T>) -> T {
get {
logger(.get, wrappedValue[keyPath: keyPath])
return wrappedValue[keyPath: keyPath]
}
set {
logger(.set, newValue)
wrappedValue[keyPath: keyPath] = newValue
}
}
}
struct User {
@Logged var name: String
@Logged var age: Int
}
let user = User(name: "John", age: 42)
user.name = "Jane"
user.age = 43
// Logged<String>
// Logged<Int>
```logger(.get, wrappedValue[keyPath: keyPath]) // cannot convert value of type 'T' to expected argument type 'Value'logger(.set, newValue) // cannot convert value of type 'T' to expected argument type 'Value'enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<Value>: LoggedProtocol {
var wrappedValue: Value
let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Logged<Value> {
get { self }
set { self = newValue }
}
}
struct User {
@Logged(logger: { print($0, $1) }) var name: String
@Logged(logger: { print($0, $1) }) var age: Int
}```swift
enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value>: LoggedProtocol {
var wrappedValue: Value
let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Logged<Value> {
get { self }
set { self = newValue }
}
}
struct User {
@Logged(logger: { print($0, $1) }) var name: String
@Logged(logger: { print($0, $1) }) var age: Int
}
let user = User(name: "John", age: 42)
user.name = "Jane"
print(user.name)
// get set
// Jane
```@Logged(logger: { print($0, $1) }) var name: String // missing argument for parameter 'wrappedValue' in call@Logged(logger: { print($0, $1) }) var age: Int // missing argument for parameter 'wrappedValue' in callenum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<Value>: LoggedProtocol {
var wrappedValue: Value
let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Logged<Value> {
get { self }
set { self = newValue }
}
}
struct User {
@Logged(logger: { print($0, $1) }) var name: String
@Logged(logger: { print($0, $1) }) var age: Int
}```swift
enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value>: LoggedProtocol {
var wrappedValue: Value
let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Logged<Value> {
get { self }
set { self = newValue }
}
}
struct User {
@Logged(logger: { print($0, $1) }) var name: String
@Logged(logger: { print($0, $1) }) var age: Int
}
let user = User(name: "John", age: 42)
print(user.name) // get John
user.name = "Jane" // set Jane
print(user.name) // get Jane
```@Logged(logger: { print($0, $1) }) var name: String // missing argument for parameter 'wrappedValue' in call@Logged(logger: { print($0, $1) }) var age: Int // missing argument for parameter 'wrappedValue' in callenum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<Value>: LoggedProtocol {
var wrappedValue: Value
let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Logged<Value> {
get { self }
set { self = newValue }
}
}
struct User {
@Logged(logger: { print("Event: \($0), Value: \($1)") })
var name: String
}```swift
enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value>: LoggedProtocol {
var wrappedValue: Value
let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Logged<Value> {
get { self }
set { self = newValue }
}
}
struct User {
@Logged(logger: { print("Event: \($0), Value: \($1)") })
var name: String
}
let user = User(name: "John")
user.name = "Jane"
print(user.$name)
// Prints: Event: get, Value: Jane
// Prints: Event: set, Value: Jane
```@Logged(logger: { print("Event: \($0), Value: \($1)") }) // missing argument for parameter 'wrappedValue' in callenum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<Value>: LoggedProtocol {
var wrappedValue: Value
let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
@propertyWrapper
struct Logged<Value> {
var wrappedValue: Value
let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}```swift
enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value>: LoggedProtocol {
var wrappedValue: Value
let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value> {
var wrappedValue: Value
let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value> {
var wrappedValue: Value
let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value> {
var wrappedValue: Value
let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value> {
var wrappedValue: Value
let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value> {
var wrappedValue: Value
let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value> {
var wrappedValue: Value
let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value> {
var wrappedValue: Value
let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value> {
var wrappedValue: Value
let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value> {
var wrappedValue: Value
let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value> {
var wrappedValue: Value
let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
struct Logged<Value> { // invalid redeclaration of 'Logged'let logger: (Event, Int) -> Void = { // immutable value 'logger' was never used; consider replacing with '_' or removing it@Logged(logger: logger) var value: Int = 0 // 'Logged' is ambiguous for type lookup in this contextenum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<Value>: LoggedProtocol {
var wrappedValue: Value
let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Logged<Value> {
get { self }
set { self = newValue }
}
}
struct User {
@Logged(logger: { print("Event: \($0), Value: \($1)") })
var name: String
}```swift
enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value>: LoggedProtocol {
var wrappedValue: Value
let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Logged<Value> {
get { self }
set { self = newValue }
}
}
struct User {
@Logged(logger: { print("Event: \($0), Value: \($1)") })
var name: String
}
let user = User(name: "John")
user.name = "Jane"
print(user.$name)
// Event: set, Value: Jane
// Event: get, Value: Jane
```@Logged(logger: { print("Event: \($0), Value: \($1)") }) // missing argument for parameter 'wrappedValue' in callenum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<Value>: LoggedProtocol {
var wrappedValue: Value
let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Logged<Value> {
get { self }
set { self = newValue }
}
}
struct User {
@Logged(logger: { print("Event: \($0), Value: \($1)") })
var name: String
}```swift
enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value>: LoggedProtocol {
var wrappedValue: Value
let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Logged<Value> {
get { self }
set { self = newValue }
}
}
struct User {
@Logged(logger: { print("Event: \($0), Value: \($1)") })
var name: String
}
let user = User(name: "John")
user.name = "Jane"
print(user.$name)
// Prints: Event: get, Value: Jane
// Prints: Event: set, Value: Jane
```@Logged(logger: { print("Event: \($0), Value: \($1)") }) // missing argument for parameter 'wrappedValue' in callenum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<Value>: LoggedProtocol {
var wrappedValue: Value
let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
struct User {
@Logged(logger: { event, value in
print("User: \(event) \(value)")
})
var name: String
}```swift
enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value>: LoggedProtocol {
var wrappedValue: Value
let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
struct User {
@Logged(logger: { event, value in
print("User: \(event) \(value)")
})
var name: String
}
let user = User(name: "John")
user.name = "Jane"
print(user.name)
// Output:
// User: set Jane
// User: get Jane
```@Logged(logger: { event, value in // missing argument for parameter 'wrappedValue' in callenum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<Value>: LoggedProtocol {
var wrappedValue: Value
let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Logged<Value> {
get { self }
set { self = newValue }
}
}
struct User {
@Logged(logger: { print("Event: \($0), Value: \($1)") })
var name: String
}```swift
enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value>: LoggedProtocol {
var wrappedValue: Value
let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Logged<Value> {
get { self }
set { self = newValue }
}
}
struct User {
@Logged(logger: { print("Event: \($0), Value: \($1)") })
var name: String
}
let user = User(name: "John Appleseed")
print(user.name)
// Prints "Event: get, Value: John Appleseed"
user.name = "Jane Appleseed"
print(user.name)
// Prints "Event: set, Value: Jane Appleseed"
```@Logged(logger: { print("Event: \($0), Value: \($1)") }) // missing argument for parameter 'wrappedValue' in callprotocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
return .success(city: searchBar.text ?? "", forecast: "")
case .keyboardDeleteBackwards:
return .success(city: searchBar.text ?? "", forecast: "")
case .searchButtonPress:
guard let city = searchBar.text else {
return .failure(city: "")
}
do {
let forecast = try provider.forecast(for: city)
return .success(city: city, forecast: forecast)
} catch {
return .failure(city: city)
}
}
}
}
class WeatherViewController: UIViewController {
private let application: WeatherApplicationProtocol
private let searchBar: UISearchBar
init(application: WeatherApplicationProtocol, searchBar: UISearchBar) {
self.application = application
self.searchBar = searchBar
super.init(nibName: nil, bundle: nil)
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func viewDidLoad() {
super.viewDidLoad()
searchBar.delegate = self
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
searchBar.becomeFirstResponder()
}
override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
searchBar.resignFirstResponder()
}
}
extension WeatherViewController: UISearchBarDelegate {
func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
if let feedback = application.handle(action: .keyboardCharacterSelect(searchText.last!)) {
switch feedback {
case .success(let city, let forecast):
print("Successfully fetched forecast for \(city): \(forecast)")
case .failure(let city):
print("Failed to fetch forecast for \(city)")
}
}
}
func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {
if let feedback = application.handle(action: .searchButtonPress) {
switch feedback {
case .success(let city, let forecast):
print("Successfully fetched forecast for \(city): \(forecast)")
case .failure(let city):
print("Failed to fetch forecast for \(city)")
}
}
}
func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
searchBar.resignFirstResponder()
}
}```swift
protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
return .success(city: searchBar.text ?? "", forecast: "")
case .keyboardDeleteBackwards:
return .success(city: searchBar.text ?? "", forecast: "")
case .searchButtonPress:
guard let city = searchBar.text else {
return .failure(city: "")
}
do {
let forecast = try provider.forecast(for: city)
return .success(city: city, forecast: forecast)
} catch {
return .failure(city: city)
}
}
}
}
// Weather application view controller.
// Handle user interactions and update search bar text.
class WeatherViewController: UIViewController {
private let application: WeatherApplicationProtocol
private let searchBar: UISearchBar
init(application: WeatherApplicationProtocol, searchBar: UISearchBar) {
self.application = application
self.searchBar = searchBar
super.init(nibName: nil, bundle: nil)
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func viewDidLoad() {
super.viewDidLoad()
searchBar.delegate = self
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
searchBar.becomeFirstResponder()
}
override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
searchBar.resignFirstResponder()
}
}
extension WeatherViewController: UISearchBarDelegate {
func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
if let feedback = application.handle(action: .keyboardCharacterSelect(searchText.last!)) {
switch feedback {
case .success(let city, let forecast):
print("Successfully fetched forecast for \(city): \(forecast)")
case .failure(let city):
print("Failed to fetch forecast for \(city)")
}
}
}
func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {
if let feedback = application.handle(action: .searchButtonPress) {
switch feedback {
case .success(let city, let forecast):
print("Successfully fetched forecast for \(city): \(forecast)")
case .failure(let city):
print("Failed to fetch forecast for \(city)")
}
}
}
func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
searchBar.resignFirstResponder()
}
}
// Weather application.
// Handle user interactions and update search bar text.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
return .success(city: searchBar.text ?? "", forecast: "")
case .keyboardDeleteBackwards:
return .success(city: searchBar.text ?? "", forecast: "")
case .searchButtonPress:
guard let city = searchBar.text else {
return .failure(city: "")
}
do {
let forecast = try provider.forecast(for: city)
return .success(city: city, forecast: forecast)
} catch {
return .failure(city: city)
}
}
}
}
// Weather application view controller.
// Handle user interactions and update search bar text.
class WeatherViewController: UIViewController {
private let application: WeatherApplicationProtocol
private let searchBar: UISearchBar
init(applicationreturn .success(city: searchBar.text ?? "", forecast: "") // cannot find 'searchBar' in scopereturn .success(city: searchBar.text ?? "", forecast: "") // cannot find 'searchBar' in scopeguard let city = searchBar.text else { // cannot find 'searchBar' in scopeclass WeatherViewController: UIViewController { // cannot find type 'UIViewController' in scopeprivate let searchBar: UISearchBar // cannot find type 'UISearchBar' in scopeinit(application: WeatherApplicationProtocol, searchBar: UISearchBar) { // cannot find type 'UISearchBar' in scopesuper.init(nibName: nil, bundle: nil) // 'super' members cannot be referenced in a root classoverride func viewDidLoad() { // method does not override any method from its superclasssuper.viewDidLoad() // 'super' members cannot be referenced in a root classoverride func viewWillAppear(_ animated: Bool) { // method does not override any method from its superclasssuper.viewWillAppear(animated) // 'super' members cannot be referenced in a root classoverride func viewWillDisappear(_ animated: Bool) { // method does not override any method from its superclasssuper.viewWillDisappear(animated) // 'super' members cannot be referenced in a root classextension WeatherViewController: UISearchBarDelegate { // cannot find type 'UISearchBarDelegate' in scopefunc searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) { // cannot find type 'UISearchBar' in scopefunc searchBarSearchButtonClicked(_ searchBar: UISearchBar) { // cannot find type 'UISearchBar' in scopefunc searchBarCancelButtonClicked(_ searchBar: UISearchBar) { // cannot find type 'UISearchBar' in scopeprotocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
return .success(city: city, forecast: try! provider.forecast(for: city))
case .keyboardDeleteBackwards:
return .failure(city: city)
case .searchButtonPress:
return .failure(city: city)
}
}
}```swift
protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
return .success(city: city, forecast: try! provider.forecast(for: city))
case .keyboardDeleteBackwards:
return .failure(city: city)
case .searchButtonPress:
return .failure(city: city)
}
}
}
```return .success(city: city, forecast: try! provider.forecast(for: city)) // cannot find 'city' in scopereturn .success(city: city, forecast: try! provider.forecast(for: city)) // cannot find 'city' in scopereturn .failure(city: city) // cannot find 'city' in scopereturn .failure(city: city) // cannot find 'city' in scopeprotocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
return .success(city: city, forecast: try! provider.forecast(for: city))
case .keyboardDeleteBackwards:
return .success(city: city, forecast: try! provider.forecast(for: city))
case .searchButtonPress:
return .success(city: city, forecast: try! provider.forecast(for: city))
}
}
}```swift
protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
return .success(city: city, forecast: try! provider.forecast(for: city))
case .keyboardDeleteBackwards:
return .success(city: city, forecast: try! provider.forecast(for: city))
case .searchButtonPress:
return .success(city: city, forecast: try! provider.forecast(for: city))
}
}
}
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
return .success(city: city, forecast: try! provider.forecast(for: city))
case .keyboardDeleteBackwards:
return .success(city: city, forecast: try! provider.forecast(for: city))
case .searchButtonPress:
return .success(city: city, forecast: try! provider.forecast(for: city))
}
}
}
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
return .success(city: city, forecast: try! provider.forecast(for: city))
case .keyboardDeleteBackwards:
return .success(city: city, forecast: try! provider.forecast(for: city))
case .searchButtonPress:
return .success(city: city, forecast: try! provider.forecast(for: city))
}
}
}
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
return .success(city: city, forecast: try! provider.forecast(for: city))
case .keyboardDeleteBackwards:
return .success(city: city, forecast: try! provider.forecast(for: city))
case .searchButtonPress:
return .success(city: city, forecast: try! provider.forecast(for: city))
}
}
}
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
return .success(city: city, forecast: try! provider.forecast(for: city))
case .keyboardDeleteBackwards:
return .success(city: city, forecast: try! provider.forecast(for: city))
case .searchButtonPress:
return .success(city: city, forecast: try! provider.forecast(for: city))
}
}
}
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: Weatherreturn .success(city: city, forecast: try! provider.forecast(for: city)) // cannot find 'city' in scopereturn .success(city: city, forecast: try! provider.forecast(for: city)) // cannot find 'city' in scopereturn .success(city: city, forecast: try! provider.forecast(for: city)) // cannot find 'city' in scopereturn .success(city: city, forecast: try! provider.forecast(for: city)) // cannot find 'city' in scopereturn .success(city: city, forecast: try! provider.forecast(for: city)) // cannot find 'city' in scopereturn .success(city: city, forecast: try! provider.forecast(for: city)) // cannot find 'city' in scopeprotocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
private var searchBarText: String = ""
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchBarText.append(character)
return nil
case .keyboardDeleteBackwards:
searchBarText.removeLast()
return nil
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: searchBarText)
return .success(city: searchBarText, forecast: forecast)
} catch {
return .failure(city: searchBarText)
}
}
}
}```swift
protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
private var searchBarText: String = ""
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchBarText.append(character)
return nil
case .keyboardDeleteBackwards:
searchBarText.removeLast()
return nil
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: searchBarText)
return .success(city: searchBarText, forecast: forecast)
} catch {
return .failure(city: searchBarText)
}
}
}
}
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
private var searchBarText: String = ""
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchBarText.append(character)
return nil
case .keyboardDeleteBackwards:
searchBarText.removeLast()
return nil
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: searchBarText)
return .success(city: searchBarText, forecast: forecast)
} catch {
return .failure(city: searchBarText)
}
}
}
}
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
private var searchBarText: String = ""
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchBarText.append(character)
return nil
case .keyboardDeleteBackwards:
searchBarText.removeLast()
return nil
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: searchBarText)
return .success(city: searchBarText, forecast: forecast)
} catch {
return .failure(city: searchBarText)
}
}
}
}
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
private var searchBarText: String = ""
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchBarText.append(character)
return nil
case .keyboardDeleteBackwards:
searchBarText.removeLast()
return nil
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: searchBarText)
return .success(city: searchBarText, forecast: forecast)
} catch {
return .failure(city: searchBarText)
}
}
}
}
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
private var searchBarText: String = ""
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchBarText.append(character)
return nil
case .keyboardDeleteBackwards:
protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
return .success(city: searchBarText, forecast: try! provider.forecast(for: searchBarText))
case .keyboardDeleteBackwards:
return .success(city: searchBarText, forecast: try! provider.forecast(for: searchBarText))
case .searchButtonPress:
return .success(city: searchBarText, forecast: try! provider.forecast(for: searchBarText))
}
}
}```swift
protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
return .success(city: searchBarText, forecast: try! provider.forecast(for: searchBarText))
case .keyboardDeleteBackwards:
return .success(city: searchBarText, forecast: try! provider.forecast(for: searchBarText))
case .searchButtonPress:
return .success(city: searchBarText, forecast: try! provider.forecast(for: searchBarText))
}
}
}
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
return .success(city: searchBarText, forecast: try! provider.forecast(for: searchBarText))
case .keyboardDeleteBackwards:
return .success(city: searchBarText, forecast: try! provider.forecast(for: searchBarText))
case .searchButtonPress:
return .success(city: searchBarText, forecast: try! provider.forecast(for: searchBarText))
}
}
}
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
return .success(city: searchBarText, forecast: try! provider.forecast(for: searchBarText))
case .keyboardDeleteBackwards:
return .success(city: searchBarText, forecast: try! provider.forecast(for: searchBarText))
case .searchButtonPress:
return .success(city: searchBarText, forecast: try! provider.forecast(for: searchBarText))
}
}
}
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
return .success(city: searchBarText, forecast: try! provider.forecast(for: searchBarText))
case .keyboardDeleteBackwards:
return .success(city: searchBarText, forecast: try! provider.forecast(for: searchBarText))
case .searchButtonPress:
return .success(city: searchBarText, forecast: try! provider.forecast(for: searchBarText))
}
}
}
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
return .success(city: searchBarText, forecast: try! provider.forecast(for: searchBarText))
case .keyboardDeleteBackwards:
return .success(city: searchBarText, forecast: try! provider.forecast(for: searchBarText))
case .searchButtonPress:
return .success(city: searchBarText, forecast: try! provider.forecast(forreturn .success(city: searchBarText, forecast: try! provider.forecast(for: searchBarText)) // cannot find 'searchBarText' in scopereturn .success(city: searchBarText, forecast: try! provider.forecast(for: searchBarText)) // cannot find 'searchBarText' in scopereturn .success(city: searchBarText, forecast: try! provider.forecast(for: searchBarText)) // cannot find 'searchBarText' in scopereturn .success(city: searchBarText, forecast: try! provider.forecast(for: searchBarText)) // cannot find 'searchBarText' in scopereturn .success(city: searchBarText, forecast: try! provider.forecast(for: searchBarText)) // cannot find 'searchBarText' in scopereturn .success(city: searchBarText, forecast: try! provider.forecast(for: searchBarText)) // cannot find 'searchBarText' in scopeprotocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
private var searchBarText: String = ""
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchBarText.append(character)
return nil
case .keyboardDeleteBackwards:
searchBarText.removeLast()
return nil
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: searchBarText)
return .success(city: searchBarText, forecast: forecast)
} catch {
return .failure(city: searchBarText)
}
}
}
}
class WeatherProvider: WeatherProvider {
func forecast(for city: String) throws -> String {
// Fetch weather forecast from a weather API.
return "Forecast for \(city)"
}
}```swift
protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
private var searchBarText: String = ""
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchBarText.append(character)
return nil
case .keyboardDeleteBackwards:
searchBarText.removeLast()
return nil
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: searchBarText)
return .success(city: searchBarText, forecast: forecast)
} catch {
return .failure(city: searchBarText)
}
}
}
}
// Weather provider.
// Fetches weather forecast from a weather API.
class WeatherProvider: WeatherProvider {
func forecast(for city: String) throws -> String {
// Fetch weather forecast from a weather API.
return "Forecast for \(city)"
}
}
// Weather application.
// Uses WeatherProvider to check forecast.
let weatherApplication = WeatherApplication(provider: WeatherProvider())
// User interaction.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
let userAction = UserAction.keyboardCharacterSelect("A")
let applicationFeedback = weatherApplication.handle(action: userAction)
// Application feedback.
// Success or failure feedback.
switch applicationFeedback {
case .success(let city, let forecast):
print("Success: \(city) - \(forecast)")
case .failure(let city):
print("Failure: \(city)")
}
```init(provider: WeatherProvider) // 'WeatherProvider' is ambiguous for type lookup in this contextprivate let provider: WeatherProvider // 'WeatherProvider' is ambiguous for type lookup in this contextrequired init(provider: WeatherProvider) { // 'WeatherProvider' is ambiguous for type lookup in this contextclass WeatherProvider: WeatherProvider { // 'WeatherProvider' is ambiguous for type lookup in this contextclass WeatherProvider: WeatherProvider { // invalid redeclaration of 'WeatherProvider'struct WeatherProviderImplementation: WeatherProvider { // 'WeatherProvider' is ambiguous for type lookup in this contextXCTAssertNil(application.handle(action: .keyboardCharacterSelect("K"))) // cannot infer contextual base in reference to member 'keyboardCharacterSelect'XCTAssertNil(application.handle(action: .keyboardCharacterSelect("y"))) // cannot infer contextual base in reference to member 'keyboardCharacterSelect'XCTAssertNil(application.handle(action: .keyboardCharacterSelect("i"))) // cannot infer contextual base in reference to member 'keyboardCharacterSelect'XCTAssertNil(application.handle(action: .keyboardCharacterSelect("v"))) // cannot infer contextual base in reference to member 'keyboardCharacterSelect'XCTAssertEqual(application.handle(action: .searchButtonPress), .success(city: "Kyiv", forecast: "+28")) // cannot infer contextual base in reference to member 'searchButtonPress'XCTAssertEqual(application.handle(action: .searchButtonPress), .success(city: "Kyiv", forecast: "+28")) // type 'Equatable' has no member 'success'(0..<4).forEach { _ in _ = application.handle(action: .keyboardDeleteBackwards) } // Clear search input // cannot infer contextual base in reference to member 'keyboardDeleteBackwards'XCTAssertNil(application.handle(action: .keyboardCharacterSelect("W"))) // cannot infer contextual base in reference to member 'keyboardCharacterSelect'XCTAssertNil(application.handle(action: .keyboardCharacterSelect("s"))) // cannot infer contextual base in reference to member 'keyboardCharacterSelect'XCTAssertNil(application.handle(action: .keyboardCharacterSelect("a"))) // cannot infer contextual base in reference to member 'keyboardCharacterSelect'XCTAssertNil(application.handle(action: .keyboardCharacterSelect("w"))) // cannot infer contextual base in reference to member 'keyboardCharacterSelect'XCTAssertEqual(application.handle(action: .searchButtonPress), .failure(city: "Wsaw")) // type 'Equatable' has no member 'failure'XCTAssertEqual(application.handle(action: .searchButtonPress), .failure(city: "Wsaw")) // cannot infer contextual base in reference to member 'searchButtonPress'protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
return .success(city: city, forecast: try! provider.forecast(for: city))
case .keyboardDeleteBackwards:
return .failure(city: city)
case .searchButtonPress:
return .failure(city: city)
}
}
}```swift
protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
return .success(city: city, forecast: try! provider.forecast(for: city))
case .keyboardDeleteBackwards:
return .failure(city: city)
case .searchButtonPress:
return .failure(city: city)
}
}
}
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
return .success(city: city, forecast: try! provider.forecast(for: city))
case .keyboardDeleteBackwards:
return .failure(city: city)
case .searchButtonPress:
return .failure(city: city)
}
}
}
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
return .success(city: city, forecast: try! provider.forecast(for: city))
case .keyboardDeleteBackwards:
return .failure(city: city)
case .searchButtonPress:
return .failure(city: city)
}
}
}
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
return .success(city: city, forecast: try! provider.forecast(for: city))
case .keyboardDeleteBackwards:
return .failure(city: city)
case .searchButtonPress:
return .failure(city: city)
}
}
}
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
return .success(city: city, forecast: try! provider.forecast(for: city))
case .keyboardDeleteBackwards:
return .failure(city: city)
case .searchButtonPress:
return .failure(city: city)
}
}
}
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
return .success(city: city, forecast: try! provider.forecast(for: city))
case .keyboardDeleteBackwards:
return .failure(city: city)
case .searchButtonPress:
return .failure(city: city)
}
}
}return .success(city: city, forecast: try! provider.forecast(for: city)) // cannot find 'city' in scopereturn .success(city: city, forecast: try! provider.forecast(for: city)) // cannot find 'city' in scopereturn .failure(city: city) // cannot find 'city' in scopereturn .failure(city: city) // cannot find 'city' in scopeprotocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
return .success(city: searchBarText, forecast: try! provider.forecast(for: searchBarText))
case .keyboardDeleteBackwards:
return .success(city: searchBarText, forecast: try! provider.forecast(for: searchBarText))
case .searchButtonPress:
return .success(city: searchBarText, forecast: try! provider.forecast(for: searchBarText))
}
}
}```swift
protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
return .success(city: searchBarText, forecast: try! provider.forecast(for: searchBarText))
case .keyboardDeleteBackwards:
return .success(city: searchBarText, forecast: try! provider.forecast(for: searchBarText))
case .searchButtonPress:
return .success(city: searchBarText, forecast: try! provider.forecast(for: searchBarText))
}
}
}
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
return .success(city: searchBarText, forecast: try! provider.forecast(for: searchBarText))
case .keyboardDeleteBackwards:
return .success(city: searchBarText, forecast: try! provider.forecast(for: searchBarText))
case .searchButtonPress:
return .success(city: searchBarText, forecast: try! provider.forecast(for: searchBarText))
}
}
}
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
return .success(city: searchBarText, forecast: try! provider.forecast(for: searchBarText))
case .keyboardDeleteBackwards:
return .success(city: searchBarText, forecast: try! provider.forecast(for: searchBarText))
case .searchButtonPress:
return .success(city: searchBarText, forecast: try! provider.forecast(for: searchBarText))
}
}
}
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
return .success(city: searchBarText, forecast: try! provider.forecast(for: searchBarText))
case .keyboardDeleteBackwards:
return .success(city: searchBarText, forecast: try! provider.forecast(for: searchBarText))
case .searchButtonPress:
return .success(city: searchBarText, forecast: try! provider.forecast(for: searchBarText))
}
}
}
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
return .success(city: searchBarText, forecast: try! provider.forecast(for: searchBarText))
case .keyboardDeleteBackwards:
return .success(city: searchBarText, forecast: try! provider.forecast(for: searchBarText))
case .searchButtonPress:
return .success(city: searchBarText, forecast: try! provider.forecast(forreturn .success(city: searchBarText, forecast: try! provider.forecast(for: searchBarText)) // cannot find 'searchBarText' in scopereturn .success(city: searchBarText, forecast: try! provider.forecast(for: searchBarText)) // cannot find 'searchBarText' in scopereturn .success(city: searchBarText, forecast: try! provider.forecast(for: searchBarText)) // cannot find 'searchBarText' in scopereturn .success(city: searchBarText, forecast: try! provider.forecast(for: searchBarText)) // cannot find 'searchBarText' in scopereturn .success(city: searchBarText, forecast: try! provider.forecast(for: searchBarText)) // cannot find 'searchBarText' in scopereturn .success(city: searchBarText, forecast: try! provider.forecast(for: searchBarText)) // cannot find 'searchBarText' in scopeprotocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
private var searchBarText: String = ""
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchBarText.append(character)
return nil
case .keyboardDeleteBackwards:
searchBarText.removeLast()
return nil
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: searchBarText)
return .success(city: searchBarText, forecast: forecast)
} catch {
return .failure(city: searchBarText)
}
}
}
}```swift
protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
private var searchBarText: String = ""
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchBarText.append(character)
return nil
case .keyboardDeleteBackwards:
searchBarText.removeLast()
return nil
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: searchBarText)
return .success(city: searchBarText, forecast: forecast)
} catch {
return .failure(city: searchBarText)
}
}
}
}
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
private var searchBarText: String = ""
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchBarText.append(character)
return nil
case .keyboardDeleteBackwards:
searchBarText.removeLast()
return nil
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: searchBarText)
return .success(city: searchBarText, forecast: forecast)
} catch {
return .failure(city: searchBarText)
}
}
}
}
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
private var searchBarText: String = ""
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchBarText.append(character)
return nil
case .keyboardDeleteBackwards:
searchBarText.removeLast()
return nil
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: searchBarText)
return .success(city: searchBarText, forecast: forecast)
} catch {
return .failure(city: searchBarText)
}
}
}
}
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
private var searchBarText: String = ""
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchBarText.append(character)
return nil
case .keyboardDeleteBackwards:
searchBarText.removeLast()
return nil
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: searchBarText)
return .success(city: searchBarText, forecast: forecast)
} catch {
return .failure(city: searchBarText)
}
}
}
}
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
private var searchBarText: String = ""
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchBarText.append(character)
return nil
case .keyboardDeleteBackwards:
protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
private var searchBarText: String = ""
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchBarText.append(character)
return nil
case .keyboardDeleteBackwards:
searchBarText.removeLast()
return nil
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: searchBarText)
return .success(city: searchBarText, forecast: forecast)
} catch {
return .failure(city: searchBarText)
}
}
}
}```swift
protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
private var searchBarText: String = ""
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchBarText.append(character)
return nil
case .keyboardDeleteBackwards:
searchBarText.removeLast()
return nil
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: searchBarText)
return .success(city: searchBarText, forecast: forecast)
} catch {
return .failure(city: searchBarText)
}
}
}
}
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
private var searchBarText: String = ""
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchBarText.append(character)
return nil
case .keyboardDeleteBackwards:
searchBarText.removeLast()
return nil
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: searchBarText)
return .success(city: searchBarText, forecast: forecast)
} catch {
return .failure(city: searchBarText)
}
}
}
}
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
private var searchBarText: String = ""
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchBarText.append(character)
return nil
case .keyboardDeleteBackwards:
searchBarText.removeLast()
return nil
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: searchBarText)
return .success(city: searchBarText, forecast: forecast)
} catch {
return .failure(city: searchBarText)
}
}
}
}
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
private var searchBarText: String = ""
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchBarText.append(character)
return nil
case .keyboardDeleteBackwards:
searchBarText.removeLast()
return nil
case .searchButtonPress:
do {
let forecast = try provider.forecast(for: searchBarText)
return .success(city: searchBarText, forecast: forecast)
} catch {
return .failure(city: searchBarText)
}
}
}
}
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
private var searchBarText: String = ""
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchBarText.append(character)
return nil
case .keyboardDeleteBackwards:
protocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
actor BankAccount: BankAccountProtocol {
private var balance: Double
init(balance: Double) {
self.balance = balance
}
func deposit(amount: Double) async {
await Task.sleep(nanoseconds: 1_000_000_000)
balance += amount
}
func withdraw(amount: Double) async -> Bool {
await Task.sleep(nanoseconds: 1_000_000_000)
if balance >= amount {
balance -= amount
return true
} else {
return false
}
}
var balance: Double {
get async {
await Task.sleep(nanoseconds: 1_000_000_000)
return balance
}
}
}```swift
protocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
// Thread-safe bank account class using an actor that allows asynchronous deposits and withdrawals, ensuring that the account balance remains consistent and transactions are atomic.
actor BankAccount: BankAccountProtocol {
private var balance: Double
init(balance: Double) {
self.balance = balance
}
func deposit(amount: Double) async {
await Task.sleep(nanoseconds: 1_000_000_000)
balance += amount
}
func withdraw(amount: Double) async -> Bool {
await Task.sleep(nanoseconds: 1_000_000_000)
if balance >= amount {
balance -= amount
return true
} else {
return false
}
}
var balance: Double {
get async {
await Task.sleep(nanoseconds: 1_000_000_000)
return balance
}
}
}
let account = BankAccount(balance: 100)
Task {
let result = await account.withdraw(amount: 50)
print("Withdrawal result: \(result)")
}
Task {
let result = await account.withdraw(amount: 50)
print("Withdrawal result: \(result)")
}
Task {
let result = await account.withdraw(amount: 50)
print("Withdrawal result: \(result)")
}
Task {
let result = await account.withdraw(amount: 50)
print("Withdrawal result: \(result)")
}
Task {
let result = await account.withdraw(amount: 50)
print("Withdrawal result: \(result)")
}
Task {
let result = await account.withdraw(amount: 50)
print("Withdrawal result: \(result)")
}
Task {
let result = await account.withdraw(amount: 50)
print("Withdrawal result: \(result)")
}
Task {
let result = await account.withdraw(amount: 50)
print("Withdrawal result: \(result)")
}
Task {
let result = await account.withdraw(amount: 50)
print("Withdrawal result: \(result)")
}
Task {
let result = await account.withdraw(amount: 50)
print("Withdrawal result: \(result)")
}
Task {
let result = await account.withdraw(amount: 50)
print("Withdrawal result: \(result)")
}
Task {
let result = await account.withdraw(amount: 50)
print("Withdrawal result: \(result)")
}
Task {
let result = await account.withdraw(amount: 50)
print("Withdrawal result: \(result)")
}
Task {
let result = await account.withdraw(amount: 50)
print("Withdrawal result: \(result)")
}
Task {
let result = await account.withdraw(amount: 50)
print("Withdrawal result: \(result)")
}
Task {
let result = await account.withdraw(amount: 50)
print("Withdrawal result: \(result)")
}
Task {
let result = await account.withdraw(amount: 50)
print("Withdrawal result: \(result)")
}
Task {
let result = await account.withdraw(amount: 50)
print("Withdrawal result: \(result)")
}
Task {
let result = await account.withdraw(amount: 50)
print("Withdrawal result: \(result)")
}
Task {
let result = await account.withdraw(amount: 50)
print("Withdrawal result: \(result)")
}
Task {
let result = await account.withdraw(amount: 50)
print("Withdrawal result: \(result)")
}
Task {
let result = await account.withdraw(amount: 50)
print("Withdrawal result: \(result)")
}
Task {
let result = await account.withdraw(amount: 50)
print("Withdrawal result: \(result)")
}
private var balance: Double // property 'balance' must be declared internal because it matches a requirement in internal protocol 'BankAccountProtocol'await Task.sleep(nanoseconds: 1_000_000_000) // call can throw, but it is not marked with 'try' and the error is not handledawait Task.sleep(nanoseconds: 1_000_000_000) // call can throw, but it is not marked with 'try' and the error is not handledvar balance: Double { // invalid redeclaration of 'balance'await Task.sleep(nanoseconds: 1_000_000_000) // call can throw, but it is not marked with 'try' and the error is not handledprotocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
actor BankAccount: BankAccountProtocol {
private var balance: Double
init(balance: Double) {
self.balance = balance
}
var balance: Double {
get async {
await self.balance
}
}
func deposit(amount: Double) async {
self.balance += amount
}
func withdraw(amount: Double) async -> Bool {
if self.balance >= amount {
self.balance -= amount
return true
}
return false
}
}```swift
protocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
// Thread-safe bank account class using an actor that allows asynchronous deposits and withdrawals, ensuring that the account balance remains consistent and transactions are atomic.
actor BankAccount: BankAccountProtocol {
private var balance: Double
init(balance: Double) {
self.balance = balance
}
var balance: Double {
get async {
await self.balance
}
}
func deposit(amount: Double) async {
self.balance += amount
}
func withdraw(amount: Double) async -> Bool {
if self.balance >= amount {
self.balance -= amount
return true
}
return false
}
}
```private var balance: Double // property 'balance' must be declared internal because it matches a requirement in internal protocol 'BankAccountProtocol'var balance: Double { // invalid redeclaration of 'balance'await self.balance // no 'async' operations occur within 'await' expressionprotocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
actor BankAccount: BankAccountProtocol {
private var balance: Double
init(balance: Double) {
self.balance = balance
}
func deposit(amount: Double) async {
balance += amount
}
func withdraw(amount: Double) async -> Bool {
if amount > balance {
return false
}
balance -= amount
return true
}
}```swift
protocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
// Thread-safe bank account class using an actor that allows asynchronous deposits and withdrawals, ensuring that the account balance remains consistent and transactions are atomic.
actor BankAccount: BankAccountProtocol {
private var balance: Double
init(balance: Double) {
self.balance = balance
}
func deposit(amount: Double) async {
balance += amount
}
func withdraw(amount: Double) async -> Bool {
if amount > balance {
return false
}
balance -= amount
return true
}
}
```private var balance: Double // property 'balance' must be declared internal because it matches a requirement in internal protocol 'BankAccountProtocol'protocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
actor BankAccount: BankAccountProtocol {
private var balance: Double
init(balance: Double) {
self.balance = balance
}
var balance: Double {
get async {
return await self.balance
}
}
func deposit(amount: Double) async {
await self.balance += amount
}
func withdraw(amount: Double) async -> Bool {
if amount <= await self.balance {
await self.balance -= amount
return true
}
return false
}
}```swift
protocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
// Thread-safe bank account class using an actor that allows asynchronous deposits and withdrawals, ensuring that the account balance remains consistent and transactions are atomic.
actor BankAccount: BankAccountProtocol {
private var balance: Double
init(balance: Double) {
self.balance = balance
}
var balance: Double {
get async {
return await self.balance
}
}
func deposit(amount: Double) async {
await self.balance += amount
}
func withdraw(amount: Double) async -> Bool {
if amount <= await self.balance {
await self.balance -= amount
return true
}
return false
}
}
```private var balance: Double // property 'balance' must be declared internal because it matches a requirement in internal protocol 'BankAccountProtocol'var balance: Double { // invalid redeclaration of 'balance'return await self.balance // no 'async' operations occur within 'await' expressionawait self.balance += amount // no 'async' operations occur within 'await' expressionif amount <= await self.balance { // no 'async' operations occur within 'await' expressionif amount <= await self.balance { // 'await' cannot appear to the right of a non-assignment operatorawait self.balance -= amount // no 'async' operations occur within 'await' expressionprotocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
actor BankAccount: BankAccountProtocol {
private var balance: Double
init(balance: Double) {
self.balance = balance
}
var balance: Double {
get async {
await self.balance
}
}
func deposit(amount: Double) async {
self.balance += amount
}
func withdraw(amount: Double) async -> Bool {
if self.balance >= amount {
self.balance -= amount
return true
} else {
return false
}
}
}```swift
protocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
// Thread-safe bank account class using an actor that allows asynchronous deposits and withdrawals, ensuring that the account balance remains consistent and transactions are atomic.
actor BankAccount: BankAccountProtocol {
private var balance: Double
init(balance: Double) {
self.balance = balance
}
var balance: Double {
get async {
await self.balance
}
}
func deposit(amount: Double) async {
self.balance += amount
}
func withdraw(amount: Double) async -> Bool {
if self.balance >= amount {
self.balance -= amount
return true
} else {
return false
}
}
}
```private var balance: Double // property 'balance' must be declared internal because it matches a requirement in internal protocol 'BankAccountProtocol'var balance: Double { // invalid redeclaration of 'balance'await self.balance // no 'async' operations occur within 'await' expressionprotocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
actor BankAccount: BankAccountProtocol {
private var balance: Double
init(balance: Double) {
self.balance = balance
}
func deposit(amount: Double) async {
balance += amount
}
func withdraw(amount: Double) async -> Bool {
if amount > balance {
return false
}
balance -= amount
return true
}
}
class BankAccount: BankAccountProtocol {
private var balance: Double
private let lock = Lock()
init(balance: Double) {
self.balance = balance
}
func deposit(amount: Double) async {
lock.lock()
defer { lock.unlock() }
balance += amount
}
func withdraw(amount: Double) async -> Bool {
lock.lock()
defer { lock.unlock() }
if amount > balance {
return false
}
balance -= amount
return true
}
}```swift
protocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
// Thread-safe bank account class using an actor that allows asynchronous deposits and withdrawals, ensuring that the account balance remains consistent and transactions are atomic.
actor BankAccount: BankAccountProtocol {
private var balance: Double
init(balance: Double) {
self.balance = balance
}
func deposit(amount: Double) async {
balance += amount
}
func withdraw(amount: Double) async -> Bool {
if amount > balance {
return false
}
balance -= amount
return true
}
}
// Thread-safe bank account class using a lock to ensure that the account balance remains consistent and transactions are atomic.
class BankAccount: BankAccountProtocol {
private var balance: Double
private let lock = Lock()
init(balance: Double) {
self.balance = balance
}
func deposit(amount: Double) async {
lock.lock()
defer { lock.unlock() }
balance += amount
}
func withdraw(amount: Double) async -> Bool {
lock.lock()
defer { lock.unlock() }
if amount > balance {
return false
}
balance -= amount
return true
}
}
```private var balance: Double // property 'balance' must be declared internal because it matches a requirement in internal protocol 'BankAccountProtocol'class BankAccount: BankAccountProtocol { // invalid redeclaration of 'BankAccount'private var balance: Double // property 'balance' must be declared internal because it matches a requirement in internal protocol 'BankAccountProtocol'private let lock = Lock() // cannot find 'Lock' in scopeinit(balance: Double) { // initializer requirement 'init(balance:)' can only be satisfied by a 'required' initializer in non-final class 'BankAccount'protocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
actor BankAccount: BankAccountProtocol {
private var balance: Double
init(balance: Double) {
self.balance = balance
}
var balance: Double {
get async {
await self.balance
}
}
func deposit(amount: Double) async {
self.balance += amount
}
func withdraw(amount: Double) async -> Bool {
if self.balance >= amount {
self.balance -= amount
return true
}
return false
}
}
class BankAccount: BankAccountProtocol {
private var balance: Double
private let lock = NSLock()
init(balance: Double) {
self.balance = balance
}
var balance: Double {
get {
lock.lock()
defer { lock.unlock() }
return balance
}
set {
lock.lock()
defer { lock.unlock() }
self.balance = newValue
}
}
func deposit(amount: Double) {
lock.lock()
defer { lock.unlock() }
self.balance += amount
}
func withdraw(amount: Double) -> Bool {
lock.lock()
defer { lock.unlock() }
if self.balance >= amount {
self.balance -= amount
return true
}
return false
}
}
class BankAccount: BankAccountProtocol {
private var balance: Double
private let semaphore = DispatchSemaphore(value: 1)
init(balance: Double) {
self.balance = balance
}
var balance: Double {
get {
semaphore.wait()
defer { semaphore.signal() }
return balance
}
set {
semaphore.wait()
defer { semaphore.signal() }
self.balance = newValue
}
}
func deposit(amount: Double) {
semaphore.wait()
defer { semaphore.signal() }
self.balance += amount
}
func withdraw(amount: Double) -> Bool {
semaphore.wait()
defer { semaphore.signal() }
if self.balance >= amount {
self.balance -= amount
return true
}
return false
}
}```swift
protocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
// Thread-safe bank account class using an actor that allows asynchronous deposits and withdrawals, ensuring that the account balance remains consistent and transactions are atomic.
actor BankAccount: BankAccountProtocol {
private var balance: Double
init(balance: Double) {
self.balance = balance
}
var balance: Double {
get async {
await self.balance
}
}
func deposit(amount: Double) async {
self.balance += amount
}
func withdraw(amount: Double) async -> Bool {
if self.balance >= amount {
self.balance -= amount
return true
}
return false
}
}
// Thread-safe bank account class using a lock to ensure that the account balance remains consistent and transactions are atomic.
class BankAccount: BankAccountProtocol {
private var balance: Double
private let lock = NSLock()
init(balance: Double) {
self.balance = balance
}
var balance: Double {
get {
lock.lock()
defer { lock.unlock() }
return balance
}
set {
lock.lock()
defer { lock.unlock() }
self.balance = newValue
}
}
func deposit(amount: Double) {
lock.lock()
defer { lock.unlock() }
self.balance += amount
}
func withdraw(amount: Double) -> Bool {
lock.lock()
defer { lock.unlock() }
if self.balance >= amount {
self.balance -= amount
return true
}
return false
}
}
// Thread-safe bank account class using a semaphore to ensure that the account balance remains consistent and transactions are atomic.
class BankAccount: BankAccountProtocol {
private var balance: Double
private let semaphore = DispatchSemaphore(value: 1)
init(balance: Double) {
self.balance = balance
}
var balance: Double {
get {
semaphore.wait()
defer { semaphore.signal() }
return balance
}
set {
semaphore.wait()
defer { semaphore.signal() }
self.balance = newValue
}
}
func deposit(amount: Double) {
semaphore.wait()
defer { semaphore.signal() }
self.balance += amount
}
func withdraw(amount: Double) -> Bool {
semaphore.wait()
defer { semaphore.signal() }
if self.balance >= amount {
self.balance -= amount
return true
}
return false
}
}
```private var balance: Double // property 'balance' must be declared internal because it matches a requirement in internal protocol 'BankAccountProtocol'var balance: Double { // invalid redeclaration of 'balance'await self.balance // no 'async' operations occur within 'await' expressionclass BankAccount: BankAccountProtocol { // invalid redeclaration of 'BankAccount'private var balance: Double // property 'balance' must be declared internal because it matches a requirement in internal protocol 'BankAccountProtocol'init(balance: Double) { // initializer requirement 'init(balance:)' can only be satisfied by a 'required' initializer in non-final class 'BankAccount'var balance: Double { // invalid redeclaration of 'balance'class BankAccount: BankAccountProtocol { // invalid redeclaration of 'BankAccount'private var balance: Double // property 'balance' must be declared internal because it matches a requirement in internal protocol 'BankAccountProtocol'init(balance: Double) { // initializer requirement 'init(balance:)' can only be satisfied by a 'required' initializer in non-final class 'BankAccount'var balance: Double { // invalid redeclaration of 'balance'protocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
actor BankAccount: BankAccountProtocol {
private var balance: Double
init(balance: Double) {
self.balance = balance
}
var balance: Double {
get async {
await self.balance
}
}
func deposit(amount: Double) async {
self.balance += amount
}
func withdraw(amount: Double) async -> Bool {
if self.balance >= amount {
self.balance -= amount
return true
} else {
return false
}
}
}
class BankAccount: BankAccountProtocol {
private var balance: Double
private let lock = NSLock()
init(balance: Double) {
self.balance = balance
}
var balance: Double {
get async {
self.lock.lock()
defer { self.lock.unlock() }
return self.balance
}
}
func deposit(amount: Double) async {
self.lock.lock()
defer { self.lock.unlock() }
self.balance += amount
}
func withdraw(amount: Double) async -> Bool {
self.lock.lock()
defer { self.lock.unlock() }
if self.balance >= amount {
self.balance -= amount
return true
} else {
return false
}
}
}
class BankAccount: BankAccountProtocol {
private var balance: Double
private let queue = DispatchQueue(label: "BankAccountQueue")
init(balance: Double) {
self.balance = balance
}
var balance: Double {
get async {
await self.queue.sync {
self.balance
}
}
}
func deposit(amount: Double) async {
await self.queue.sync {
self.balance += amount
}
}
func withdraw(amount: Double) async -> Bool {
await self.queue.sync {
if self.balance >= amount {
self.balance -= amount
return true
} else {
return false
}
}
}
}```swift
protocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
// Thread-safe bank account class using an actor that allows asynchronous deposits and withdrawals, ensuring that the account balance remains consistent and transactions are atomic.
actor BankAccount: BankAccountProtocol {
private var balance: Double
init(balance: Double) {
self.balance = balance
}
var balance: Double {
get async {
await self.balance
}
}
func deposit(amount: Double) async {
self.balance += amount
}
func withdraw(amount: Double) async -> Bool {
if self.balance >= amount {
self.balance -= amount
return true
} else {
return false
}
}
}
// Thread-safe bank account class using a lock to ensure that the account balance remains consistent and transactions are atomic.
class BankAccount: BankAccountProtocol {
private var balance: Double
private let lock = NSLock()
init(balance: Double) {
self.balance = balance
}
var balance: Double {
get async {
self.lock.lock()
defer { self.lock.unlock() }
return self.balance
}
}
func deposit(amount: Double) async {
self.lock.lock()
defer { self.lock.unlock() }
self.balance += amount
}
func withdraw(amount: Double) async -> Bool {
self.lock.lock()
defer { self.lock.unlock() }
if self.balance >= amount {
self.balance -= amount
return true
} else {
return false
}
}
}
// Thread-safe bank account class using a dispatch queue to ensure that the account balance remains consistent and transactions are atomic.
class BankAccount: BankAccountProtocol {
private var balance: Double
private let queue = DispatchQueue(label: "BankAccountQueue")
init(balance: Double) {
self.balance = balance
}
var balance: Double {
get async {
await self.queue.sync {
self.balance
}
}
}
func deposit(amount: Double) async {
await self.queue.sync {
self.balance += amount
}
}
func withdraw(amount: Double) async -> Bool {
await self.queue.sync {
if self.balance >= amount {
self.balance -= amount
return true
} else {
return false
}
}
}
}
```private var balance: Double // property 'balance' must be declared internal because it matches a requirement in internal protocol 'BankAccountProtocol'var balance: Double { // invalid redeclaration of 'balance'await self.balance // no 'async' operations occur within 'await' expressionclass BankAccount: BankAccountProtocol { // invalid redeclaration of 'BankAccount'private var balance: Double // property 'balance' must be declared internal because it matches a requirement in internal protocol 'BankAccountProtocol'init(balance: Double) { // initializer requirement 'init(balance:)' can only be satisfied by a 'required' initializer in non-final class 'BankAccount'var balance: Double { // invalid redeclaration of 'balance'self.lock.lock() // instance method 'lock' is unavailable from asynchronous contexts; Use async-safe scoped locking instead; this is an error in Swift 6self.lock.lock() // instance method 'lock' is unavailable from asynchronous contexts; Use async-safe scoped locking instead; this is an error in Swift 6self.lock.lock() // instance method 'lock' is unavailable from asynchronous contexts; Use async-safe scoped locking instead; this is an error in Swift 6class BankAccount: BankAccountProtocol { // invalid redeclaration of 'BankAccount'private var balance: Double // property 'balance' must be declared internal because it matches a requirement in internal protocol 'BankAccountProtocol'init(balance: Double) { // initializer requirement 'init(balance:)' can only be satisfied by a 'required' initializer in non-final class 'BankAccount'var balance: Double { // invalid redeclaration of 'balance'await self.queue.sync { // no 'async' operations occur within 'await' expressionawait self.queue.sync { // no 'async' operations occur within 'await' expressionawait self.queue.sync { // no 'async' operations occur within 'await' expressionprotocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
actor BankAccount: BankAccountProtocol {
private var balance: Double
init(balance: Double) {
self.balance = balance
}
var balance: Double {
get async {
await self.balance
}
}
func deposit(amount: Double) async {
self.balance += amount
}
func withdraw(amount: Double) async -> Bool {
if self.balance >= amount {
self.balance -= amount
return true
} else {
return false
}
}
}
class BankAccount: BankAccountProtocol {
private var balance: Double
private let lock = NSLock()
init(balance: Double) {
self.balance = balance
}
var balance: Double {
get {
lock.lock()
defer { lock.unlock() }
return balance
}
set {
lock.lock()
defer { lock.unlock() }
self.balance = newValue
}
}
func deposit(amount: Double) {
lock.lock()
defer { lock.unlock() }
self.balance += amount
}
func withdraw(amount: Double) -> Bool {
lock.lock()
defer { lock.unlock() }
if self.balance >= amount {
self.balance -= amount
return true
} else {
return false
}
}
}```swift
protocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
// Thread-safe bank account class using an actor that allows asynchronous deposits and withdrawals, ensuring that the account balance remains consistent and transactions are atomic.
actor BankAccount: BankAccountProtocol {
private var balance: Double
init(balance: Double) {
self.balance = balance
}
var balance: Double {
get async {
await self.balance
}
}
func deposit(amount: Double) async {
self.balance += amount
}
func withdraw(amount: Double) async -> Bool {
if self.balance >= amount {
self.balance -= amount
return true
} else {
return false
}
}
}
// Thread-safe bank account class using a lock to ensure that the account balance remains consistent and transactions are atomic.
class BankAccount: BankAccountProtocol {
private var balance: Double
private let lock = NSLock()
init(balance: Double) {
self.balance = balance
}
var balance: Double {
get {
lock.lock()
defer { lock.unlock() }
return balance
}
set {
lock.lock()
defer { lock.unlock() }
self.balance = newValue
}
}
func deposit(amount: Double) {
lock.lock()
defer { lock.unlock() }
self.balance += amount
}
func withdraw(amount: Double) -> Bool {
lock.lock()
defer { lock.unlock() }
if self.balance >= amount {
self.balance -= amount
return true
} else {
return false
}
}
}
```private var balance: Double // property 'balance' must be declared internal because it matches a requirement in internal protocol 'BankAccountProtocol'var balance: Double { // invalid redeclaration of 'balance'await self.balance // no 'async' operations occur within 'await' expressionclass BankAccount: BankAccountProtocol { // invalid redeclaration of 'BankAccount'private var balance: Double // property 'balance' must be declared internal because it matches a requirement in internal protocol 'BankAccountProtocol'init(balance: Double) { // initializer requirement 'init(balance:)' can only be satisfied by a 'required' initializer in non-final class 'BankAccount'var balance: Double { // invalid redeclaration of 'balance'protocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
actor BankAccount: BankAccountProtocol {
private var balance: Double
init(balance: Double) {
self.balance = balance
}
var balance: Double {
get async {
await self.balance
}
}
func deposit(amount: Double) async {
await self.balance += amount
}
func withdraw(amount: Double) async -> Bool {
if amount > self.balance {
return false
}
await self.balance -= amount
return true
}
}
class BankAccount: BankAccountProtocol {
private var balance: Double
private let lock = Lock()
init(balance: Double) {
self.balance = balance
}
var balance: Double {
get {
lock.lock()
defer { lock.unlock() }
return balance
}
}
func deposit(amount: Double) {
lock.lock()
defer { lock.unlock() }
balance += amount
}
func withdraw(amount: Double) -> Bool {
lock.lock()
defer { lock.unlock() }
if amount > balance {
return false
}
balance -= amount
return true
}
}
class BankAccount: BankAccountProtocol {
private var balance: Double
private let semaphore = DispatchSemaphore(value: 1)
init(balance: Double) {
self.balance = balance
}
var balance: Double {
get {
semaphore.wait()
defer { semaphore.signal() }
return balance
}
}
func deposit(amount: Double) {
semaphore.wait()
defer { semaphore.signal() }
balance += amount
}
func withdraw(amount: Double) -> Bool {
semaphore.wait()
defer { semaphore.signal() }
if amount > balance {
return false
}
balance -= amount
return true
}
}```swift
protocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
// Thread-safe bank account class using an actor that allows asynchronous deposits and withdrawals, ensuring that the account balance remains consistent and transactions are atomic.
actor BankAccount: BankAccountProtocol {
private var balance: Double
init(balance: Double) {
self.balance = balance
}
var balance: Double {
get async {
await self.balance
}
}
func deposit(amount: Double) async {
await self.balance += amount
}
func withdraw(amount: Double) async -> Bool {
if amount > self.balance {
return false
}
await self.balance -= amount
return true
}
}
// Thread-safe bank account class using a lock that allows synchronous deposits and withdrawals, ensuring that the account balance remains consistent and transactions are atomic.
class BankAccount: BankAccountProtocol {
private var balance: Double
private let lock = Lock()
init(balance: Double) {
self.balance = balance
}
var balance: Double {
get {
lock.lock()
defer { lock.unlock() }
return balance
}
}
func deposit(amount: Double) {
lock.lock()
defer { lock.unlock() }
balance += amount
}
func withdraw(amount: Double) -> Bool {
lock.lock()
defer { lock.unlock() }
if amount > balance {
return false
}
balance -= amount
return true
}
}
// Thread-safe bank account class using a semaphore that allows synchronous deposits and withdrawals, ensuring that the account balance remains consistent and transactions are atomic.
class BankAccount: BankAccountProtocol {
private var balance: Double
private let semaphore = DispatchSemaphore(value: 1)
init(balance: Double) {
self.balance = balance
}
var balance: Double {
get {
semaphore.wait()
defer { semaphore.signal() }
return balance
}
}
func deposit(amount: Double) {
semaphore.wait()
defer { semaphore.signal() }
balance += amount
}
func withdraw(amount: Double) -> Bool {
semaphore.wait()
defer { semaphore.signal() }
if amount > balance {
return false
}
balance -= amount
return true
}
}
```private var balance: Double // property 'balance' must be declared internal because it matches a requirement in internal protocol 'BankAccountProtocol'var balance: Double { // invalid redeclaration of 'balance'await self.balance // no 'async' operations occur within 'await' expressionawait self.balance += amount // no 'async' operations occur within 'await' expressionawait self.balance -= amount // no 'async' operations occur within 'await' expressionclass BankAccount: BankAccountProtocol { // invalid redeclaration of 'BankAccount'private var balance: Double // property 'balance' must be declared internal because it matches a requirement in internal protocol 'BankAccountProtocol'private let lock = Lock() // cannot find 'Lock' in scopeinit(balance: Double) { // initializer requirement 'init(balance:)' can only be satisfied by a 'required' initializer in non-final class 'BankAccount'var balance: Double { // invalid redeclaration of 'balance'class BankAccount: BankAccountProtocol { // invalid redeclaration of 'BankAccount'private var balance: Double // property 'balance' must be declared internal because it matches a requirement in internal protocol 'BankAccountProtocol'init(balance: Double) { // initializer requirement 'init(balance:)' can only be satisfied by a 'required' initializer in non-final class 'BankAccount'var balance: Double { // invalid redeclaration of 'balance'protocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var value: Value?
private let condition: () -> Bool
private let wrappedValue: () -> Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.condition = condition
self.wrappedValue = wrappedValue
}
var wrappedValue: Value {
get {
if condition() {
if value == nil {
value = wrappedValue()
}
} else {
value = nil
}
return value!
}
set {
value = newValue
}
}
}```swift
protocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var value: Value?
private let condition: () -> Bool
private let wrappedValue: () -> Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.condition = condition
self.wrappedValue = wrappedValue
}
var wrappedValue: Value {
get {
if condition() {
if value == nil {
value = wrappedValue()
}
} else {
value = nil
}
return value!
}
set {
value = newValue
}
}
}
```struct Cached<Value>: CachedProperty { // property wrapper type 'Cached' has multiple non-static properties named 'wrappedValue'var wrappedValue: Value { // invalid redeclaration of 'wrappedValue'value = wrappedValue() // cannot assign to property: 'self' is immutablevalue = nil // cannot assign to property: 'self' is immutableprotocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
@propertyWrapper
struct Cached<Value>: CachedProperty {
private let condition: () -> Bool
private var value: Value?
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.condition = condition
self.value = wrappedValue()
}
var wrappedValue: Value {
get {
guard condition() else { return value! }
value = wrappedValue()
return value!
}
set { value = newValue }
}
}```swift
protocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private let condition: () -> Bool
private var value: Value?
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.condition = condition
self.value = wrappedValue()
}
var wrappedValue: Value {
get {
guard condition() else { return value! }
value = wrappedValue()
return value!
}
set { value = newValue }
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private let condition: () -> Bool
private var value: Value?
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.condition = condition
self.value = wrappedValue()
}
var wrappedValue: Value {
get {
guard condition() else { return value! }
value = wrappedValue()
return value!
}
set { value = newValue }
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private let condition: () -> Bool
private var value: Value?
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.condition = condition
self.value = wrappedValue()
}
var wrappedValue: Value {
get {
guard condition() else { return value! }
value = wrappedValue()
return value!
}
set { value = newValue }
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private let condition: () -> Bool
private var value: Value?
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.condition = condition
self.value = wrappedValue()
}
var wrappedValue: Value {
get {
guard condition() else { return value! }
value = wrappedValue()
return value!
}
set { value = newValue }
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private let condition: () -> Bool
private var value: Value?
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.condition = condition
self.value = wrappedValue()
}
var wrappedValue: Value {
get {
guard condition() else { return value! }
value = wrappedValue()
return value!
}
set { value = newValue }
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private let condition: () -> Bool
private var value: Value?
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.condition = condition
self.value = wrappedValue()
}
var wrappedValue: Value {
get {
guard condition() else { return value! }
value = wrappedValue()
return value!
}
set { value = newValue }
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private let condition: () -> Bool
private var value: Value?
init(wrappedValue: @autoclosure @escaping () -> Value,value = wrappedValue() // cannot call value of non-function type 'Value'value = wrappedValue() // cannot assign to property: 'self' is immutableprotocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var condition: () -> Bool
private var value: Value?
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.condition = condition
self.value = nil
self.wrappedValue = wrappedValue
}
var wrappedValue: Value {
get {
if condition() {
if value == nil {
value = wrappedValue()
}
return value!
} else {
return wrappedValue()
}
}
set {
value = newValue
}
}
}```swift
protocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var condition: () -> Bool
private var value: Value?
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.condition = condition
self.value = nil
self.wrappedValue = wrappedValue
}
var wrappedValue: Value {
get {
if condition() {
if value == nil {
value = wrappedValue()
}
return value!
} else {
return wrappedValue()
}
}
set {
value = newValue
}
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var condition: () -> Bool
private var value: Value?
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.condition = condition
self.value = nil
self.wrappedValue = wrappedValue
}
var wrappedValue: Value {
get {
if condition() {
if value == nil {
value = wrappedValue()
}
return value!
} else {
return wrappedValue()
}
}
set {
value = newValue
}
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var condition: () -> Bool
private var value: Value?
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.condition = condition
self.value = nil
self.wrappedValue = wrappedValue
}
var wrappedValue: Value {
get {
if condition() {
if value == nil {
value = wrappedValue()
}
return value!
} else {
return wrappedValue()
}
}
set {
value = newValue
}
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var condition: () -> Bool
private var value: Value?
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.condition = condition
self.value = nil
self.wrappedValue = wrappedValue
}
var wrappedValue: Value {
get {
if condition() {
if value == nil {
value = wrappedValue()
}
return value!
} else {
return wrappedValue()
}
}
set {
value = newValue
}
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var condition: () -> Bool
private var value: Value?
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.condition = condition
self.value = nil
self.wrappedValue = wrappedValue
}
var wrappedValue: Value {
get {
if condition() {
if value == nil {
value = wrappedValue()
}
return value!
} else {
return wrappedValue()
}
}
set {
value = newValue
}
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var condition: () -> Bool
private var value: Value?
init(wrappedValue: @autoclosure @escaping () -> Valueself.wrappedValue = wrappedValue // function produces expected type 'Value'; did you mean to call it with '()'?value = wrappedValue() // cannot assign to property: 'self' is immutablevalue = wrappedValue() // cannot call value of non-function type 'Value'return wrappedValue() // cannot call value of non-function type 'Value'protocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var value: Value?
private let condition: () -> Bool
private let wrappedValue: () -> Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.condition = condition
self.wrappedValue = wrappedValue
}
var wrappedValue: Value {
if condition() {
if value == nil {
value = wrappedValue()
}
return value!
} else {
return wrappedValue()
}
}
}```swift
protocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var value: Value?
private let condition: () -> Bool
private let wrappedValue: () -> Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.condition = condition
self.wrappedValue = wrappedValue
}
var wrappedValue: Value {
if condition() {
if value == nil {
value = wrappedValue()
}
return value!
} else {
return wrappedValue()
}
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var value: Value?
private let condition: () -> Bool
private let wrappedValue: () -> Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.condition = condition
self.wrappedValue = wrappedValue
}
var wrappedValue: Value {
if condition() {
if value == nil {
value = wrappedValue()
}
return value!
} else {
return wrappedValue()
}
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var value: Value?
private let condition: () -> Bool
private let wrappedValue: () -> Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.condition = condition
self.wrappedValue = wrappedValue
}
var wrappedValue: Value {
if condition() {
if value == nil {
value = wrappedValue()
}
return value!
} else {
return wrappedValue()
}
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var value: Value?
private let condition: () -> Bool
private let wrappedValue: () -> Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.condition = condition
self.wrappedValue = wrappedValue
}
var wrappedValue: Value {
if condition() {
if value == nil {
value = wrappedValue()
}
return value!
} else {
return wrappedValue()
}
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var value: Value?
private let condition: () -> Bool
private let wrappedValue: () -> Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.condition = condition
self.wrappedValue = wrappedValue
}
var wrappedValue: Value {
if condition() {
if value == nil {
value = wrappedValue()
}
return value!
} else {
return wrappedValue()
}
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var value: Value?
private let condition: () -> Bool
private let wrappedValue: () -> Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.condition = condition
self.wrappedValue = wrappedValue
}
var wrappedValue: Value {
if condition() {
if value == nil {
value = wrappedValue()
}
return value!
} else {
return wrappedValuestruct Cached<Value>: CachedProperty { // property wrapper type 'Cached' has multiple non-static properties named 'wrappedValue'var wrappedValue: Value { // invalid redeclaration of 'wrappedValue'value = wrappedValue() // cannot assign to property: 'self' is immutableprotocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var value: Value?
private let condition: () -> Bool
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.value = nil
self.condition = condition
self._wrappedValue = wrappedValue
}
var wrappedValue: Value {
mutating get {
if condition() && value == nil {
value = wrappedValue()
}
return value!
}
set {
value = newValue
}
}
var projectedValue: Cached<Value> {
return self
}
}```swift
protocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var value: Value?
private let condition: () -> Bool
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.value = nil
self.condition = condition
self._wrappedValue = wrappedValue
}
var wrappedValue: Value {
mutating get {
if condition() && value == nil {
value = wrappedValue()
}
return value!
}
set {
value = newValue
}
}
var projectedValue: Cached<Value> {
return self
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var value: Value?
private let condition: () -> Bool
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.value = nil
self.condition = condition
self._wrappedValue = wrappedValue
}
var wrappedValue: Value {
mutating get {
if condition() && value == nil {
value = wrappedValue()
}
return value!
}
set {
value = newValue
}
}
var projectedValue: Cached<Value> {
return self
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var value: Value?
private let condition: () -> Bool
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.value = nil
self.condition = condition
self._wrappedValue = wrappedValue
}
var wrappedValue: Value {
mutating get {
if condition() && value == nil {
value = wrappedValue()
}
return value!
}
set {
value = newValue
}
}
var projectedValue: Cached<Value> {
return self
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var value: Value?
private let condition: () -> Bool
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.value = nil
self.condition = condition
self._wrappedValue = wrappedValue
}
var wrappedValue: Value {
mutating get {
if condition() && value == nil {
value = wrappedValue()
}
return value!
}
set {
value = newValue
}
}
var projectedValue: Cached<Value> {
return self
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var value: Value?
private let condition: () -> Bool
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.value = nil
self.condition = condition
self._wrappedValue = wrappedValue
}
var wrappedValue: Value {
mutating get {
if condition() && value == nil {
value = wrappedValue()
}
return value!
}
set {
value = newValue
}
}
var projectedValue: Cached<Value> {
return self
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var value: Value?
private let condition:self._wrappedValue = wrappedValue // value of type 'Cached<Value>' has no member '_wrappedValue'value = wrappedValue() // cannot call value of non-function type 'Value'protocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var condition: () -> Bool
private var value: Value?
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.condition = condition
self.value = nil
self.wrappedValue = wrappedValue
}
var wrappedValue: Value {
get {
if condition() {
if value == nil {
value = wrappedValue()
}
return value!
} else {
return wrappedValue()
}
}
set {
value = newValue
}
}
}```swift
protocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var condition: () -> Bool
private var value: Value?
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.condition = condition
self.value = nil
self.wrappedValue = wrappedValue
}
var wrappedValue: Value {
get {
if condition() {
if value == nil {
value = wrappedValue()
}
return value!
} else {
return wrappedValue()
}
}
set {
value = newValue
}
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var condition: () -> Bool
private var value: Value?
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.condition = condition
self.value = nil
self.wrappedValue = wrappedValue
}
var wrappedValue: Value {
get {
if condition() {
if value == nil {
value = wrappedValue()
}
return value!
} else {
return wrappedValue()
}
}
set {
value = newValue
}
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var condition: () -> Bool
private var value: Value?
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.condition = condition
self.value = nil
self.wrappedValue = wrappedValue
}
var wrappedValue: Value {
get {
if condition() {
if value == nil {
value = wrappedValue()
}
return value!
} else {
return wrappedValue()
}
}
set {
value = newValue
}
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var condition: () -> Bool
private var value: Value?
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.condition = condition
self.value = nil
self.wrappedValue = wrappedValue
}
var wrappedValue: Value {
get {
if condition() {
if value == nil {
value = wrappedValue()
}
return value!
} else {
return wrappedValue()
}
}
set {
value = newValue
}
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var condition: () -> Bool
private var value: Value?
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.condition = condition
self.value = nil
self.wrappedValue = wrappedValue
}
var wrappedValue: Value {
get {
if condition() {
if value == nil {
value = wrappedValue()
}
return value!
} else {
return wrappedValue()
}
}
set {
value = newValue
}
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var condition: () -> Bool
private var value: Value?
init(wrappedValue: @autoclosure @escaping () -> Valueself.wrappedValue = wrappedValue // function produces expected type 'Value'; did you mean to call it with '()'?value = wrappedValue() // cannot assign to property: 'self' is immutablevalue = wrappedValue() // cannot call value of non-function type 'Value'return wrappedValue() // cannot call value of non-function type 'Value'protocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var value: Value?
private let condition: () -> Bool
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.value = nil
self.condition = condition
self._wrappedValue = wrappedValue
}
var wrappedValue: Value {
mutating get {
if condition() {
if value == nil {
value = wrappedValue()
}
} else {
value = nil
}
return value!
}
set {
value = newValue
}
}
var projectedValue: Self {
get { self }
set { self = newValue }
}
}```swift
protocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var value: Value?
private let condition: () -> Bool
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.value = nil
self.condition = condition
self._wrappedValue = wrappedValue
}
var wrappedValue: Value {
mutating get {
if condition() {
if value == nil {
value = wrappedValue()
}
} else {
value = nil
}
return value!
}
set {
value = newValue
}
}
var projectedValue: Self {
get { self }
set { self = newValue }
}
}
```self._wrappedValue = wrappedValue // value of type 'Cached<Value>' has no member '_wrappedValue'value = wrappedValue() // cannot call value of non-function type 'Value'protocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
@propertyWrapper
struct Cached<Value>: CachedProperty {
private let condition: () -> Bool
private var value: Value?
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.condition = condition
self.value = wrappedValue()
}
var wrappedValue: Value {
get {
if condition() {
value = wrappedValue()
}
return value!
}
set {
value = newValue
}
}
}```swift
protocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private let condition: () -> Bool
private var value: Value?
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.condition = condition
self.value = wrappedValue()
}
var wrappedValue: Value {
get {
if condition() {
value = wrappedValue()
}
return value!
}
set {
value = newValue
}
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private let condition: () -> Bool
private var value: Value?
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.condition = condition
self.value = wrappedValue()
}
var wrappedValue: Value {
get {
if condition() {
value = wrappedValue()
}
return value!
}
set {
value = newValue
}
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private let condition: () -> Bool
private var value: Value?
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.condition = condition
self.value = wrappedValue()
}
var wrappedValue: Value {
get {
if condition() {
value = wrappedValue()
}
return value!
}
set {
value = newValue
}
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private let condition: () -> Bool
private var value: Value?
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.condition = condition
self.value = wrappedValue()
}
var wrappedValue: Value {
get {
if condition() {
value = wrappedValue()
}
return value!
}
set {
value = newValue
}
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private let condition: () -> Bool
private var value: Value?
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.condition = condition
self.value = wrappedValue()
}
var wrappedValue: Value {
get {
if condition() {
value = wrappedValue()
}
return value!
}
set {
value = newValue
}
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private let condition: () -> Bool
private var value: Value?
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.condition = condition
self.value = wrappedValue()
}
var wrappedValue: Value {
get {
if condition() {
value = wrappedValue()
}
return value!
}
set {
value = newValue
}
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private let condition: () -> Bool
private var value: Value?
init(wrappedValue: @value = wrappedValue() // cannot call value of non-function type 'Value'value = wrappedValue() // cannot assign to property: 'self' is immutableprotocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
@propertyWrapper
struct Cached<Value>: CachedProperty {
let condition: () -> Bool
var wrappedValue: Value {
didSet {
if condition() {
self.value = wrappedValue
}
}
}
private var value: Value?
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.condition = condition
self.wrappedValue = wrappedValue()
}
}```swift
protocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
let condition: () -> Bool
var wrappedValue: Value {
didSet {
if condition() {
self.value = wrappedValue
}
}
}
private var value: Value?
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.condition = condition
self.wrappedValue = wrappedValue()
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
let condition: () -> Bool
var wrappedValue: Value {
didSet {
if condition() {
self.value = wrappedValue
}
}
}
private var value: Value?
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.condition = condition
self.wrappedValue = wrappedValue()
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
let condition: () -> Bool
var wrappedValue: Value {
didSet {
if condition() {
self.value = wrappedValue
}
}
}
private var value: Value?
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.condition = condition
self.wrappedValue = wrappedValue()
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
let condition: () -> Bool
var wrappedValue: Value {
didSet {
if condition() {
self.value = wrappedValue
}
}
}
private var value: Value?
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.condition = condition
self.wrappedValue = wrappedValue()
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
let condition: () -> Bool
var wrappedValue: Value {
didSet {
if condition() {
self.value = wrappedValue
}
}
}
private var value: Value?
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.condition = condition
self.wrappedValue = wrappedValue()
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
let condition: () -> Bool
var wrappedValue: Value {
didSet {
if condition() {
self.value = wrappedValue
}
}
}
private var value: Value?
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.condition = condition
self.wrappedValue = wrappedValue()
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
let condition: () -> Bool
var wrappedValue: Value {
didSet {
if condition() {
self.value = wrappedValue
}
}
}
private var value: Value?
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.condition = condition
self.wrappedValue = wrappedValue()
}
}
// Property wrapper that caches the computed value of a property and // XCTAssertEqual failed: (1) is not equal to (2)protocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var condition: () -> Bool
private var value: Value?
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.condition = condition
self.value = wrappedValue()
}
var wrappedValue: Value {
if condition() {
value = wrappedValue()
}
return value!
}
}```swift
protocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var condition: () -> Bool
private var value: Value?
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.condition = condition
self.value = wrappedValue()
}
var wrappedValue: Value {
if condition() {
value = wrappedValue()
}
return value!
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var condition: () -> Bool
private var value: Value?
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.condition = condition
self.value = wrappedValue()
}
var wrappedValue: Value {
if condition() {
value = wrappedValue()
}
return value!
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var condition: () -> Bool
private var value: Value?
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.condition = condition
self.value = wrappedValue()
}
var wrappedValue: Value {
if condition() {
value = wrappedValue()
}
return value!
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var condition: () -> Bool
private var value: Value?
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.condition = condition
self.value = wrappedValue()
}
var wrappedValue: Value {
if condition() {
value = wrappedValue()
}
return value!
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var condition: () -> Bool
private var value: Value?
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.condition = condition
self.value = wrappedValue()
}
var wrappedValue: Value {
if condition() {
value = wrappedValue()
}
return value!
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var condition: () -> Bool
private var value: Value?
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.condition = condition
self.value = wrappedValue()
}
var wrappedValue: Value {
if condition() {
value = wrappedValue()
}
return value!
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var condition: () -> Bool
private var value: Value?
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.condition = condition
self.value = wrappedValue()
}
var wrappedValue: Value {
if condition() {
value = wrappedValue()
}
return value!
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
value = wrappedValue() // cannot call value of non-function type 'Value'value = wrappedValue() // cannot assign to property: 'self' is immutableinfix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence {
associativity: left
higherThan: AdditionPrecedence
}
func >>> <A, B, C>(f: @escaping (A) -> B, g: @escaping (B) -> C) -> (A) -> C {
return { x in g(f(x)) }
}
func double(x: Int) -> Int {
return x * 2
}
func triple(x: Int) -> Int {
return x * 3
}```swift
infix operator >>>: FunctionCompositionPrecedence
// Custom infix operator >>> that composes two functions. The operator should take two functions and return a new function that represents the composition of the two functions (i.e., the output of the first function becomes the input of the second function).
precedencegroup FunctionCompositionPrecedence {
associativity: left
higherThan: AdditionPrecedence
}
func >>> <A, B, C>(f: @escaping (A) -> B, g: @escaping (B) -> C) -> (A) -> C {
return { x in g(f(x)) }
}
// Usage:
func double(x: Int) -> Int {
return x * 2
}
func triple(x: Int) -> Int {
return x * 3
}
let doubleTriple = double >>> triple
doubleTriple(1) // returns 6
```infix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence {
associativity: left
higherThan: AdditionPrecedence
}
func >>> <A, B, C>(_ f: @escaping (A) -> B, _ g: @escaping (B) -> C) -> (A) -> C {
return { g(f($0)) }
}
func addOne(_ x: Int) -> Int {
return x + 1
}
func multiplyByTwo(_ x: Int) -> Int {
return x * 2
}```swift
infix operator >>>: FunctionCompositionPrecedence
// Custom infix operator >>> that composes two functions. The operator should take two functions and return a new function that represents the composition of the two functions (i.e., the output of the first function becomes the input of the second function).
precedencegroup FunctionCompositionPrecedence {
associativity: left
higherThan: AdditionPrecedence
}
func >>> <A, B, C>(_ f: @escaping (A) -> B, _ g: @escaping (B) -> C) -> (A) -> C {
return { g(f($0)) }
}
// Tests
func addOne(_ x: Int) -> Int {
return x + 1
}
func multiplyByTwo(_ x: Int) -> Int {
return x * 2
}
let addOneThenMultiplyByTwo = addOne >>> multiplyByTwo
addOneThenMultiplyByTwo(1) // 4
```infix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence {
associativity: left
higherThan: AdditionPrecedence
}
func >>> <A, B, C>(_ f: @escaping (A) -> B, _ g: @escaping (B) -> C) -> (A) -> C {
return { g(f($0)) }
}```swift
infix operator >>>: FunctionCompositionPrecedence
// Custom infix operator >>> that composes two functions. The operator should take two functions and return a new function that represents the composition of the two functions (i.e., the output of the first function becomes the input of the second function).
precedencegroup FunctionCompositionPrecedence {
associativity: left
higherThan: AdditionPrecedence
}
func >>> <A, B, C>(_ f: @escaping (A) -> B, _ g: @escaping (B) -> C) -> (A) -> C {
return { g(f($0)) }
}
// Tests
let addOne = { $0 + 1 }
let double = { $0 * 2 }
let square = { $0 * $0 }
let addOneDouble = addOne >>> double
let addOneDoubleSquare = addOne >>> double >>> square
addOneDouble(1) // 4
addOneDoubleSquare(1) // 16
```infix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence {
associativity: left
higherThan: AdditionPrecedence
}
func >>> <A, B, C>(f: @escaping (A) -> B, g: @escaping (B) -> C) -> (A) -> C {
return { g(f($0)) }
}```swift
infix operator >>>: FunctionCompositionPrecedence
// Custom infix operator >>> that composes two functions. The operator should take two functions and return a new function that represents the composition of the two functions (i.e., the output of the first function becomes the input of the second function).
precedencegroup FunctionCompositionPrecedence {
associativity: left
higherThan: AdditionPrecedence
}
func >>> <A, B, C>(f: @escaping (A) -> B, g: @escaping (B) -> C) -> (A) -> C {
return { g(f($0)) }
}
// Usage:
let addOne = { $0 + 1 }
let multiplyByTwo = { $0 * 2 }
let addOneAndMultiplyByTwo = addOne >>> multiplyByTwo
addOneAndMultiplyByTwo(1) // 4
```infix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence {
associativity: left
higherThan: AdditionPrecedence
}
func >>> <A, B, C> (f: @escaping (A) -> B, g: @escaping (B) -> C) -> (A) -> C {
return { g(f($0)) }
}```swift
infix operator >>>: FunctionCompositionPrecedence
// Custom infix operator >>> that composes two functions. The operator should take two functions and return a new function that represents the composition of the two functions (i.e., the output of the first function becomes the input of the second function).
precedencegroup FunctionCompositionPrecedence {
associativity: left
higherThan: AdditionPrecedence
}
func >>> <A, B, C> (f: @escaping (A) -> B, g: @escaping (B) -> C) -> (A) -> C {
return { g(f($0)) }
}
// Usage:
let addOne = { $0 + 1 }
let multiplyByTwo = { $0 * 2 }
let addOneAndMultiplyByTwo = addOne >>> multiplyByTwo
addOneAndMultiplyByTwo(1) // returns 4
```infix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence {
associativity: left
higherThan: AdditionPrecedence
}
func >>> <A, B, C>(_ f: @escaping (A) -> B, _ g: @escaping (B) -> C) -> (A) -> C {
return { x in g(f(x)) }
}```swift
infix operator >>>: FunctionCompositionPrecedence
// Custom infix operator >>> that composes two functions. The operator should take two functions and return a new function that represents the composition of the two functions (i.e., the output of the first function becomes the input of the second function).
precedencegroup FunctionCompositionPrecedence {
associativity: left
higherThan: AdditionPrecedence
}
func >>> <A, B, C>(_ f: @escaping (A) -> B, _ g: @escaping (B) -> C) -> (A) -> C {
return { x in g(f(x)) }
}
```infix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence {
associativity: left
higherThan: AdditionPrecedence
}
func >>> <A, B, C>(f: @escaping (A) -> B, g: @escaping (B) -> C) -> (A) -> C {
return { g(f($0)) }
}
func add(a: Int, b: Int) -> Int {
return a + b
}
func double(a: Int) -> Int {
return a * 2
}```swift
infix operator >>>: FunctionCompositionPrecedence
// Custom infix operator >>> that composes two functions. The operator should take two functions and return a new function that represents the composition of the two functions (i.e., the output of the first function becomes the input of the second function).
precedencegroup FunctionCompositionPrecedence {
associativity: left
higherThan: AdditionPrecedence
}
func >>> <A, B, C>(f: @escaping (A) -> B, g: @escaping (B) -> C) -> (A) -> C {
return { g(f($0)) }
}
// Usage:
func add(a: Int, b: Int) -> Int {
return a + b
}
func double(a: Int) -> Int {
return a * 2
}
let addDouble = add >>> double
let result = addDouble(1, 2)
// Output: 6
```infix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence {
associativity: left
higherThan: AdditionPrecedence
}
func >>> <A, B, C>(_ f: @escaping (A) -> B, _ g: @escaping (B) -> C) -> (A) -> C {
return { g(f($0)) }
}```swift
infix operator >>>: FunctionCompositionPrecedence
// Custom infix operator >>> that composes two functions. The operator should take two functions and return a new function that represents the composition of the two functions (i.e., the output of the first function becomes the input of the second function).
precedencegroup FunctionCompositionPrecedence {
associativity: left
higherThan: AdditionPrecedence
}
func >>> <A, B, C>(_ f: @escaping (A) -> B, _ g: @escaping (B) -> C) -> (A) -> C {
return { g(f($0)) }
}
// Tests
let add1 = { $0 + 1 }
let mul2 = { $0 * 2 }
let add1mul2 = add1 >>> mul2
let result = add1mul2(5)
print(result) // prints 14
```infix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence {
associativity: left
higherThan: AdditionPrecedence
}
func >>> <A, B, C>(_ f: @escaping (A) -> B, _ g: @escaping (B) -> C) -> (A) -> C {
return { g(f($0)) }
}
func add(a: Int, b: Int) -> Int {
return a + b
}
func double(a: Int) -> Int {
return a * 2
}```swift
infix operator >>>: FunctionCompositionPrecedence
// Custom infix operator >>> that composes two functions. The operator should take two functions and return a new function that represents the composition of the two functions (i.e., the output of the first function becomes the input of the second function).
precedencegroup FunctionCompositionPrecedence {
associativity: left
higherThan: AdditionPrecedence
}
func >>> <A, B, C>(_ f: @escaping (A) -> B, _ g: @escaping (B) -> C) -> (A) -> C {
return { g(f($0)) }
}
// Usage
func add(a: Int, b: Int) -> Int {
return a + b
}
func double(a: Int) -> Int {
return a * 2
}
let addAndDouble = add >>> double
addAndDouble(a: 2, b: 3) // 10
```infix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence {
associativity: left
higherThan: AdditionPrecedence
}
func >>> <A, B, C>(_ f: @escaping (A) -> B, _ g: @escaping (B) -> C) -> (A) -> C {
return { g(f($0)) }
}```swift
infix operator >>>: FunctionCompositionPrecedence
// Custom infix operator >>> that composes two functions. The operator should take two functions and return a new function that represents the composition of the two functions (i.e., the output of the first function becomes the input of the second function).
precedencegroup FunctionCompositionPrecedence {
associativity: left
higherThan: AdditionPrecedence
}
func >>> <A, B, C>(_ f: @escaping (A) -> B, _ g: @escaping (B) -> C) -> (A) -> C {
return { g(f($0)) }
}
// Usage
let addOne = { $0 + 1 }
let multiplyByTwo = { $0 * 2 }
let addOneAndMultiplyByTwo = addOne >>> multiplyByTwo
addOneAndMultiplyByTwo(1) // 4
```import CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
let buffer = UnsafeMutablePointer<UInt8>.allocate(capacity: bufferSize)
defer { buffer.deallocate() }
var digest = SHA256Digest()
var readCount: Int = 0
while inputStream.hasBytesAvailable {
let read = inputStream.read(buffer, maxLength: bufferSize)
guard read > 0 else { break }
readCount += read
digest.update(buffer, byteCount: read)
}
digest.finalize()
return digest
}```swift
import CryptoKit
// Function that computes the SHA-256 hash of data read from a stream with a specified buffer size using Apple's CryptoKit framework.
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
let buffer = UnsafeMutablePointer<UInt8>.allocate(capacity: bufferSize)
defer { buffer.deallocate() }
var digest = SHA256Digest()
var readCount: Int = 0
while inputStream.hasBytesAvailable {
let read = inputStream.read(buffer, maxLength: bufferSize)
guard read > 0 else { break }
readCount += read
digest.update(buffer, byteCount: read)
}
digest.finalize()
return digest
}
```var digest = SHA256Digest() // 'SHA256Digest' cannot be constructed because it has no accessible initializersimport CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
// Create a buffer to read data from the stream into.
let buffer = UnsafeMutablePointer<UInt8>.allocate(capacity: bufferSize)
defer { buffer.deallocate() }
// Create a SHA-256 digest context.
var context = SHA256.Digest()
// Read data from the stream into the buffer until the stream is exhausted.
while inputStream.hasBytesAvailable {
// Read data from the stream into the buffer.
let bytesRead = inputStream.read(buffer, maxLength: bufferSize)
// If no bytes were read, then the stream is exhausted.
if bytesRead == 0 {
break
}
// Update the SHA-256 digest context with the data read from the stream.
context.update(buffer, byteCount: bytesRead)
}
// Finalize the SHA-256 digest context to produce the SHA-256 hash.
let hash = context.finalize()
// Return the SHA-256 hash.
return hash
}```swift
import CryptoKit
// Function that computes the SHA-256 hash of data read from a stream with a specified buffer size using Apple's CryptoKit framework.
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
// Create a buffer to read data from the stream into.
let buffer = UnsafeMutablePointer<UInt8>.allocate(capacity: bufferSize)
defer { buffer.deallocate() }
// Create a SHA-256 digest context.
var context = SHA256.Digest()
// Read data from the stream into the buffer until the stream is exhausted.
while inputStream.hasBytesAvailable {
// Read data from the stream into the buffer.
let bytesRead = inputStream.read(buffer, maxLength: bufferSize)
// If no bytes were read, then the stream is exhausted.
if bytesRead == 0 {
break
}
// Update the SHA-256 digest context with the data read from the stream.
context.update(buffer, byteCount: bytesRead)
}
// Finalize the SHA-256 digest context to produce the SHA-256 hash.
let hash = context.finalize()
// Return the SHA-256 hash.
return hash
}
```var context = SHA256.Digest() // 'SHA256.Digest' (aka 'SHA256Digest') cannot be constructed because it has no accessible initializersimport CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
// Create a SHA-256 digest context.
var digest = SHA256()
// Read data from the input stream with the specified buffer size.
let buffer = UnsafeMutablePointer<UInt8>.allocate(capacity: bufferSize)
defer { buffer.deallocate() }
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(buffer, maxLength: bufferSize)
if bytesRead < 0 {
break
}
// Update the digest with the read data.
digest.update(buffer, byteCount: bytesRead)
}
// Finalize the digest.
let finalizedDigest = digest.finalize()
return finalizedDigest
}```swift
import CryptoKit
// Function that computes the SHA-256 hash of data read from a stream with a specified buffer size using Apple's CryptoKit framework.
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
// Create a SHA-256 digest context.
var digest = SHA256()
// Read data from the input stream with the specified buffer size.
let buffer = UnsafeMutablePointer<UInt8>.allocate(capacity: bufferSize)
defer { buffer.deallocate() }
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(buffer, maxLength: bufferSize)
if bytesRead < 0 {
break
}
// Update the digest with the read data.
digest.update(buffer, byteCount: bytesRead)
}
// Finalize the digest.
let finalizedDigest = digest.finalize()
return finalizedDigest
}
```digest.update(buffer, byteCount: bytesRead) // extra argument 'byteCount' in calldigest.update(buffer, byteCount: bytesRead) // cannot convert value of type 'UnsafeMutablePointer<UInt8>' to expected argument type 'UnsafeRawBufferPointer'import CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
// Create a SHA-256 digest context.
var digest = SHA256()
// Read data from the input stream in chunks of the specified size.
var buffer = [UInt8](repeating: 0, count: bufferSize)
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
// Update the digest with the data read.
digest.update(buffer[0..<bytesRead])
}
// Finalize the digest and return the result.
return digest.finalize()
}```swift
import CryptoKit
// Function that computes the SHA-256 hash of data read from a stream with a specified buffer size using Apple's CryptoKit framework.
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
// Create a SHA-256 digest context.
var digest = SHA256()
// Read data from the input stream in chunks of the specified size.
var buffer = [UInt8](repeating: 0, count: bufferSize)
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
// Update the digest with the data read.
digest.update(buffer[0..<bytesRead])
}
// Finalize the digest and return the result.
return digest.finalize()
}
```digest.update(buffer[0..<bytesRead]) // missing argument label 'data:' in callimport CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
// Create a buffer to read data from the stream into.
var buffer = [UInt8](repeating: 0, count: bufferSize)
// Create a SHA-256 digest object.
let digest = SHA256()
// Read data from the stream into the buffer.
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
// Update the digest with the data read from the stream.
digest.update(buffer, count: bytesRead)
}
// Finalize the digest.
let finalizedDigest = digest.finalize()
// Return the finalized digest.
return finalizedDigest
}```swift
import CryptoKit
// Function that computes the SHA-256 hash of data read from a stream with a specified buffer size using Apple's CryptoKit framework.
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
// Create a buffer to read data from the stream into.
var buffer = [UInt8](repeating: 0, count: bufferSize)
// Create a SHA-256 digest object.
let digest = SHA256()
// Read data from the stream into the buffer.
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
// Update the digest with the data read from the stream.
digest.update(buffer, count: bytesRead)
}
// Finalize the digest.
let finalizedDigest = digest.finalize()
// Return the finalized digest.
return finalizedDigest
}
```digest.update(buffer, count: bytesRead) // cannot use mutating member on immutable value: 'digest' is a 'let' constantimport CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
let buffer = UnsafeMutablePointer<UInt8>.allocate(capacity: bufferSize)
defer { buffer.deallocate() }
var digest = SHA256Digest()
var read = 0
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(buffer, maxLength: bufferSize)
guard bytesRead > 0 else { break }
digest.update(buffer, byteCount: bytesRead)
read += bytesRead
}
return digest.finalize()
}```swift
import CryptoKit
// Function that computes the SHA-256 hash of data read from a stream with a specified buffer size using Apple's CryptoKit framework.
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
let buffer = UnsafeMutablePointer<UInt8>.allocate(capacity: bufferSize)
defer { buffer.deallocate() }
var digest = SHA256Digest()
var read = 0
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(buffer, maxLength: bufferSize)
guard bytesRead > 0 else { break }
digest.update(buffer, byteCount: bytesRead)
read += bytesRead
}
return digest.finalize()
}
```var digest = SHA256Digest() // 'SHA256Digest' cannot be constructed because it has no accessible initializersimport CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
let buffer = UnsafeMutablePointer<UInt8>.allocate(capacity: bufferSize)
defer { buffer.deallocate() }
var digest = SHA256Digest()
var read = 0
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(buffer, maxLength: bufferSize)
if bytesRead < 0 {
break
}
read += bytesRead
digest.update(buffer, byteCount: bytesRead)
}
digest.finalize()
return digest
}```swift
import CryptoKit
// Function that computes the SHA-256 hash of data read from a stream with a specified buffer size using Apple's CryptoKit framework.
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
let buffer = UnsafeMutablePointer<UInt8>.allocate(capacity: bufferSize)
defer { buffer.deallocate() }
var digest = SHA256Digest()
var read = 0
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(buffer, maxLength: bufferSize)
if bytesRead < 0 {
break
}
read += bytesRead
digest.update(buffer, byteCount: bytesRead)
}
digest.finalize()
return digest
}
```var digest = SHA256Digest() // 'SHA256Digest' cannot be constructed because it has no accessible initializersimport CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
let buffer = UnsafeMutablePointer<UInt8>.allocate(capacity: bufferSize)
defer { buffer.deallocate() }
var hasher = SHA256()
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(buffer, maxLength: bufferSize)
hasher.update(data: Data(bytes: buffer, count: bytesRead))
}
return hasher.finalize()
}```swift
import CryptoKit
// Function that computes the SHA-256 hash of data read from a stream with a specified buffer size using Apple's CryptoKit framework.
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
let buffer = UnsafeMutablePointer<UInt8>.allocate(capacity: bufferSize)
defer { buffer.deallocate() }
var hasher = SHA256()
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(buffer, maxLength: bufferSize)
hasher.update(data: Data(bytes: buffer, count: bytesRead))
}
return hasher.finalize()
}
```import CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
// Create a SHA-256 digest context.
let digest = SHA256.Digest()
// Read data from the input stream in chunks of the specified size.
var buffer = [UInt8](repeating: 0, count: bufferSize)
while inputStream.hasBytesAvailable {
// Read data from the input stream.
let bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
// If no data was read, break out of the loop.
if bytesRead == 0 {
break
}
// Update the digest with the data read from the input stream.
digest.update(buffer[0..<bytesRead])
}
// Finalize the digest.
let finalizedDigest = digest.finalize()
// Return the SHA-256 hash of the data read from the input stream.
return finalizedDigest
}```swift
import CryptoKit
// Function that computes the SHA-256 hash of data read from a stream with a specified buffer size using Apple's CryptoKit framework.
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
// Create a SHA-256 digest context.
let digest = SHA256.Digest()
// Read data from the input stream in chunks of the specified size.
var buffer = [UInt8](repeating: 0, count: bufferSize)
while inputStream.hasBytesAvailable {
// Read data from the input stream.
let bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
// If no data was read, break out of the loop.
if bytesRead == 0 {
break
}
// Update the digest with the data read from the input stream.
digest.update(buffer[0..<bytesRead])
}
// Finalize the digest.
let finalizedDigest = digest.finalize()
// Return the SHA-256 hash of the data read from the input stream.
return finalizedDigest
}
```let digest = SHA256.Digest() // 'SHA256.Digest' (aka 'SHA256Digest') cannot be constructed because it has no accessible initializersimport CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
var buffer = Array<UInt8>(repeating: 0, count: bufferSize)
var hash = SHA256()
var bytesRead = 0
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
if bytesRead > 0 {
hash.update(data: Data(buffer[0..<bytesRead]))
}
}
return hash.finalize()
}```swift
import CryptoKit
// Function that computes the SHA-256 hash of data read from a stream with a specified buffer size using Apple's CryptoKit framework.
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
var buffer = Array<UInt8>(repeating: 0, count: bufferSize)
var hash = SHA256()
var bytesRead = 0
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
if bytesRead > 0 {
hash.update(data: Data(buffer[0..<bytesRead]))
}
}
return hash.finalize()
}
```var bytesRead = 0 // initialization of variable 'bytesRead' was never used; consider replacing with assignment to '_' or removing ittypealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
extension String {
init(tuple16: Tuple16) {
var string = ""
for i in 0..<16 {
if tuple16.0 == 0 {
break
}
string.append(Character(UnicodeScalar(tuple16.0)))
tuple16 = (tuple16.1, tuple16.2, tuple16.3, tuple16.4, tuple16.5, tuple16.6, tuple16.7, tuple16.8, tuple16.9, tuple16.10, tuple16.11, tuple16.12, tuple16.13, tuple16.14, tuple16.15, tuple16.16)
}
self.init(string)
}
}
extension Data {
init(tuple16: Tuple16) {
var data = Data()
for i in 0..<16 {
if tuple16.0 == 0 {
break
}
data.append(tuple16.0)
tuple16 = (tuple16.1, tuple16.2, tuple16.3, tuple16.4, tuple16.5, tuple16.6, tuple16.7, tuple16.8, tuple16.9, tuple16.10, tuple16.11, tuple16.12, tuple16.13, tuple16.14, tuple16.15, tuple16.16)
}
self.init(data)
}
}```swift
typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
var string = ""
for i in 0..<16 {
if tuple16.0 == 0 {
break
}
string.append(Character(UnicodeScalar(tuple16.0)))
tuple16 = (tuple16.1, tuple16.2, tuple16.3, tuple16.4, tuple16.5, tuple16.6, tuple16.7, tuple16.8, tuple16.9, tuple16.10, tuple16.11, tuple16.12, tuple16.13, tuple16.14, tuple16.15, tuple16.16)
}
self.init(string)
}
}
// Extension to the Data type that allows initializing a Data from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension Data {
init(tuple16: Tuple16) {
var data = Data()
for i in 0..<16 {
if tuple16.0 == 0 {
break
}
data.append(tuple16.0)
tuple16 = (tuple16.1, tuple16.2, tuple16.3, tuple16.4, tuple16.5, tuple16.6, tuple16.7, tuple16.8, tuple16.9, tuple16.10, tuple16.11, tuple16.12, tuple16.13, tuple16.14, tuple16.15, tuple16.16)
}
self.init(data)
}
}
// Extension to the Data type that allows initializing a Data from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension Data {
init(tuple16: Tuple16) {
var data = Data()
for i in 0..<16 {
if tuple16.0 == 0 {
break
}
data.append(tuple16.0)
tuple16 = (tuple16.1, tuple16.2, tuple16.3, tuple16.4, tuple16.5, tuple16.6, tuple16.7, tuple16.8, tuple16.9, tuple16.10, tuple16.11, tuple16.12, tuple16.13, tuple16.14, tuple16.15, tuple16.16)
}
self.init(data)
}
}
// Extension to the Data type that allows initializing a Data from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension Data {
init(tuple16: Tuple16) {
var data = Data()
for i in 0..<16 {
if tuple16.0 == 0 {
break
}
data.append(tuple16.0)
tuple16 = (tuple16.1, tuple16.2, tuple16.3, tuple16.4, tuple16.5, tuple16.6, tuple16.7, tuple16.8, tuple16.9, tuple16.10, tuple16.11, tuple16.12, tuple16.13, tuple16.14, tuple16.15, tuple16.16)
}
self.init(data)
}
}
// Extension to the Data type that allows initializing a Data from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension Data {
init(tuple16: Tuple16) {
var data = Data()
for i in 0..<16 {
if tuple16.0 == 0 {
break
}
data.append(tuple16.0)
tuple16 = (tuple16.1, tuple16.2, tuple16.3, tuple16.4, tuple16.5,string.append(Character(UnicodeScalar(tuple16.0))) // no exact matches in call to initializertuple16 = (tuple16.1, tuple16.2, tuple16.3, tuple16.4, tuple16.5, tuple16.6, tuple16.7, tuple16.8, tuple16.9, tuple16.10, tuple16.11, tuple16.12, tuple16.13, tuple16.14, tuple16.15, tuple16.16) // cannot assign to value: 'tuple16' is a 'let' constanttuple16 = (tuple16.1, tuple16.2, tuple16.3, tuple16.4, tuple16.5, tuple16.6, tuple16.7, tuple16.8, tuple16.9, tuple16.10, tuple16.11, tuple16.12, tuple16.13, tuple16.14, tuple16.15, tuple16.16) // value of tuple type 'Tuple16' (aka '(Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)') has no member '16'data.append(tuple16.0) // no exact matches in call to instance method 'append'tuple16 = (tuple16.1, tuple16.2, tuple16.3, tuple16.4, tuple16.5, tuple16.6, tuple16.7, tuple16.8, tuple16.9, tuple16.10, tuple16.11, tuple16.12, tuple16.13, tuple16.14, tuple16.15, tuple16.16) // value of tuple type 'Tuple16' (aka '(Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)') has no member '16'tuple16 = (tuple16.1, tuple16.2, tuple16.3, tuple16.4, tuple16.5, tuple16.6, tuple16.7, tuple16.8, tuple16.9, tuple16.10, tuple16.11, tuple16.12, tuple16.13, tuple16.14, tuple16.15, tuple16.16) // cannot assign to value: 'tuple16' is a 'let' constanttypealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
extension String {
init(tuple16: Tuple16) {
var bytes = [Int8](tuple16)
var index = 0
while bytes[index] != 0 {
index += 1
}
self.init(bytes: &bytes, count: index)
}
}```swift
typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
var bytes = [Int8](tuple16)
var index = 0
while bytes[index] != 0 {
index += 1
}
self.init(bytes: &bytes, count: index)
}
}
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
var bytes = [Int8](tuple16)
var index = 0
while bytes[index] != 0 {
index += 1
}
self.init(bytes: &bytes, count: index)
}
}
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
var bytes = [Int8](tuple16)
var index = 0
while bytes[index] != 0 {
index += 1
}
self.init(bytes: &bytes, count: index)
}
}
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
var bytes = [Int8](tuple16)
var index = 0
while bytes[index] != 0 {
index += 1
}
self.init(bytes: &bytes, count: index)
}
}
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
var bytes = [Int8](tuple16)
var index = 0
while bytes[index] != 0 {
index += 1
}
self.init(bytes: &bytes, count: index)
}
}
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
var bytes = [Int8](tuple16)
var index = 0
while bytes[index] != 0 {
index += 1
}
self.init(bytes: &bytes, count: index)
}
}
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
var bytes = [Int8](tuple16)
var index = 0
while bytes[index] != 0 {
index += 1
}
self.init(bytes: &bytes, count: index)
}
}
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
var bytes = [Int8](tuple16)
var index = 0
while bytes[index] != 0 {
index += 1
}
self.init(bytes: &bytes, count: index)
}
}
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
var bytes = [Int8](tuple16)
var index = 0
while bytes[index] != 0 {
index += 1
}
self.init(bytes: &bytes, count: index)
}
}
// Extension to the String type that allows initializing a String from a tuple of var bytes = [Int8](tuple16) // no exact matches in call to initializerself.init(bytes: &bytes, count: index) // incorrect argument label in call (have 'bytes:count:', expected 'utf16CodeUnits:count:')typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
extension String {
init(tuple16: Tuple16) {
var tuple = tuple16
var string = ""
while tuple.0 != 0 {
string.append(Character(UnicodeScalar(tuple.0)))
tuple = (tuple.1, tuple.2, tuple.3, tuple.4, tuple.5, tuple.6, tuple.7, tuple.8, tuple.9, tuple.10, tuple.11, tuple.12, tuple.13, tuple.14, tuple.15, tuple.16)
}
self = string
}
}
extension Data {
init(tuple16: Tuple16) {
self = String(tuple16: tuple16).data(using: .utf8)!
}
}```swift
typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
var tuple = tuple16
var string = ""
while tuple.0 != 0 {
string.append(Character(UnicodeScalar(tuple.0)))
tuple = (tuple.1, tuple.2, tuple.3, tuple.4, tuple.5, tuple.6, tuple.7, tuple.8, tuple.9, tuple.10, tuple.11, tuple.12, tuple.13, tuple.14, tuple.15, tuple.16)
}
self = string
}
}
// Extension to the Data type that allows initializing a Data from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension Data {
init(tuple16: Tuple16) {
self = String(tuple16: tuple16).data(using: .utf8)!
}
}
```string.append(Character(UnicodeScalar(tuple.0))) // no exact matches in call to initializertuple = (tuple.1, tuple.2, tuple.3, tuple.4, tuple.5, tuple.6, tuple.7, tuple.8, tuple.9, tuple.10, tuple.11, tuple.12, tuple.13, tuple.14, tuple.15, tuple.16) // value of tuple type 'Tuple16' (aka '(Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)') has no member '16'typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
extension String {
init(tuple16: Tuple16) {
var bytes = [UInt8](repeating: 0, count: 16)
for i in 0..<16 {
bytes[i] = UInt8(tuple16.0)
tuple16 = tuple16.1
}
self.init(bytes: bytes, encoding: .utf8)
}
}```swift
typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
var bytes = [UInt8](repeating: 0, count: 16)
for i in 0..<16 {
bytes[i] = UInt8(tuple16.0)
tuple16 = tuple16.1
}
self.init(bytes: bytes, encoding: .utf8)
}
}
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
var bytes = [UInt8](repeating: 0, count: 16)
for i in 0..<16 {
bytes[i] = UInt8(tuple16.0)
tuple16 = tuple16.1
}
self.init(bytes: bytes, encoding: .utf8)
}
}
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
var bytes = [UInt8](repeating: 0, count: 16)
for i in 0..<16 {
bytes[i] = UInt8(tuple16.0)
tuple16 = tuple16.1
}
self.init(bytes: bytes, encoding: .utf8)
}
}
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
var bytes = [UInt8](repeating: 0, count: 16)
for i in 0..<16 {
bytes[i] = UInt8(tuple16.0)
tuple16 = tuple16.1
}
self.init(bytes: bytes, encoding: .utf8)
}
}
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
var bytes = [UInt8](repeating: 0, count: 16)
for i in 0..<16 {
bytes[i] = UInt8(tuple16.0)
tuple16 = tuple16.1
}
self.init(bytes: bytes, encoding: .utf8)
}
}
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
var bytes = [UInt8](repeating: 0, count: 16)
for i in 0..<16 {
bytes[i] = UInt8(tuple16.0)
tuple16 = tuple16.1
}
self.init(bytes: bytes, encoding: .utf8)
}
}
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
var bytes = [UInt8](repeating: 0, count: 16)
for i in 0..<16 {
bytes[i] = UInt8(tuple16.0)
tuple16 = tuple16.1
}
self.init(bytes: bytes, encoding: .utf8)
}
}
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
var bytes = [UInt8tuple16 = tuple16.1 // cannot assign value of type 'Int8' to type 'Tuple16' (aka '(Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)')tuple16 = tuple16.1 // cannot assign to value: 'tuple16' is a 'let' constantself.init(bytes: bytes, encoding: .utf8) // a non-failable initializer cannot delegate to failable initializer 'init(bytes:encoding:)' written with 'init?'typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
extension String {
init(tuple16: Tuple16) {
var bytes = [UInt8](repeating: 0, count: 16)
for i in 0..<16 {
bytes[i] = UInt8(tuple16.0)
tuple16 = tuple16.1
}
self.init(bytes: bytes, encoding: .utf8)
}
}```swift
typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
var bytes = [UInt8](repeating: 0, count: 16)
for i in 0..<16 {
bytes[i] = UInt8(tuple16.0)
tuple16 = tuple16.1
}
self.init(bytes: bytes, encoding: .utf8)
}
}
// Example usage
let tuple16: Tuple16 = (104, 101, 108, 108, 111, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0)
let string = String(tuple16: tuple16)
print(string) // "hello"
```tuple16 = tuple16.1 // cannot assign value of type 'Int8' to type 'Tuple16' (aka '(Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)')tuple16 = tuple16.1 // cannot assign to value: 'tuple16' is a 'let' constantself.init(bytes: bytes, encoding: .utf8) // a non-failable initializer cannot delegate to failable initializer 'init(bytes:encoding:)' written with 'init?'typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
extension String {
init(tuple16: Tuple16) {
var tuple16 = tuple16
var string = ""
while tuple16.0 != 0 {
string.append(Character(UnicodeScalar(tuple16.0)))
tuple16.0 = tuple16.1
tuple16.1 = tuple16.2
tuple16.2 = tuple16.3
tuple16.3 = tuple16.4
tuple16.4 = tuple16.5
tuple16.5 = tuple16.6
tuple16.6 = tuple16.7
tuple16.7 = tuple16.8
tuple16.8 = tuple16.9
tuple16.9 = tuple16.10
tuple16.10 = tuple16.11
tuple16.11 = tuple16.12
tuple16.12 = tuple16.13
tuple16.13 = tuple16.14
tuple16.14 = tuple16.15
tuple16.15 = tuple16.16
tuple16.16 = 0
}
self = string
}
}```swift
typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
var tuple16 = tuple16
var string = ""
while tuple16.0 != 0 {
string.append(Character(UnicodeScalar(tuple16.0)))
tuple16.0 = tuple16.1
tuple16.1 = tuple16.2
tuple16.2 = tuple16.3
tuple16.3 = tuple16.4
tuple16.4 = tuple16.5
tuple16.5 = tuple16.6
tuple16.6 = tuple16.7
tuple16.7 = tuple16.8
tuple16.8 = tuple16.9
tuple16.9 = tuple16.10
tuple16.10 = tuple16.11
tuple16.11 = tuple16.12
tuple16.12 = tuple16.13
tuple16.13 = tuple16.14
tuple16.14 = tuple16.15
tuple16.15 = tuple16.16
tuple16.16 = 0
}
self = string
}
}
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
var tuple16 = tuple16
var string = ""
while tuple16.0 != 0 {
string.append(Character(UnicodeScalar(tuple16.0)))
tuple16.0 = tuple16.1
tuple16.1 = tuple16.2
tuple16.2 = tuple16.3
tuple16.3 = tuple16.4
tuple16.4 = tuple16.5
tuple16.5 = tuple16.6
tuple16.6 = tuple16.7
tuple16.7 = tuple16.8
tuple16.8 = tuple16.9
tuple16.9 = tuple16.10
tuple16.10 = tuple16.11
tuple16.11 = tuple16.12
tuple16.12 = tuple16.13
tuple16.13 = tuple16.14
tuple16.14 = tuple16.15
tuple16.15 = tuple16.16
tuple16.16 = 0
}
self = string
}
}
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
var tuple16 = tuple16
var string = ""
while tuple16.0 != 0 {
string.append(Character(UnicodeScalar(tuple16.0)))
tuple16.0 = tuple16.1
tuple16.1 = tuple16.2
tuple16.2 = tuple16.3
tuple16.3 = tuple16.4
tuple16.4 = tuple16.5
tuple16.5 = tuple16.6
tuple16.6 = tuple16.7
tuple16.7 = tuple16.8
tuple16.8 = tuple16.9
tuple16.9 = tuple16.10
tuple16.10 = tuple16.11
tuple16.11 = tuple16.12
tuple16.12 = tuple16.13
tuple16.13 = tuple16.14
tuple16.14 = tuple16.15
tuple16.15 = tuple16.16
tuple16.16 = 0
}
self = string
}
}
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a Cstring.append(Character(UnicodeScalar(tuple16.0))) // no exact matches in call to initializertuple16.15 = tuple16.16 // value of tuple type 'Tuple16' (aka '(Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)') has no member '16'tuple16.16 = 0 // value of tuple type 'Tuple16' (aka '(Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)') has no member '16'typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
extension String {
init(tuple16: Tuple16) {
var tuple = tuple16
var string = ""
while tuple.0 != 0 {
string.append(Character(UnicodeScalar(tuple.0)))
tuple.0 = tuple.1
tuple.1 = tuple.2
tuple.2 = tuple.3
tuple.3 = tuple.4
tuple.4 = tuple.5
tuple.5 = tuple.6
tuple.6 = tuple.7
tuple.7 = tuple.8
tuple.8 = tuple.9
tuple.9 = tuple.10
tuple.10 = tuple.11
tuple.11 = tuple.12
tuple.12 = tuple.13
tuple.13 = tuple.14
tuple.14 = tuple.15
tuple.15 = tuple.16
}
self = string
}
}
extension String {
var tuple16: Tuple16 {
var tuple = (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0)
for (index, character) in self.enumerated() {
tuple.16 = Int8(character.unicodeScalars.first!.value)
if index == self.count - 1 {
break
}
tuple.15 = tuple.1
tuple.14 = tuple.2
tuple.13 = tuple.3
tuple.12 = tuple.4
tuple.11 = tuple.5
tuple.10 = tuple.6
tuple.9 = tuple.7
tuple.8 = tuple.8
tuple.7 = tuple.9
tuple.6 = tuple.10
tuple.5 = tuple.11
tuple.4 = tuple.12
tuple.3 = tuple.13
tuple.2 = tuple.14
tuple.1 = tuple.15
tuple.0 = tuple.16
}
return tuple
}
}```swift
typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
var tuple = tuple16
var string = ""
while tuple.0 != 0 {
string.append(Character(UnicodeScalar(tuple.0)))
tuple.0 = tuple.1
tuple.1 = tuple.2
tuple.2 = tuple.3
tuple.3 = tuple.4
tuple.4 = tuple.5
tuple.5 = tuple.6
tuple.6 = tuple.7
tuple.7 = tuple.8
tuple.8 = tuple.9
tuple.9 = tuple.10
tuple.10 = tuple.11
tuple.11 = tuple.12
tuple.12 = tuple.13
tuple.13 = tuple.14
tuple.14 = tuple.15
tuple.15 = tuple.16
}
self = string
}
}
// Extension to the String type that allows converting a String to a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
var tuple16: Tuple16 {
var tuple = (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0)
for (index, character) in self.enumerated() {
tuple.16 = Int8(character.unicodeScalars.first!.value)
if index == self.count - 1 {
break
}
tuple.15 = tuple.1
tuple.14 = tuple.2
tuple.13 = tuple.3
tuple.12 = tuple.4
tuple.11 = tuple.5
tuple.10 = tuple.6
tuple.9 = tuple.7
tuple.8 = tuple.8
tuple.7 = tuple.9
tuple.6 = tuple.10
tuple.5 = tuple.11
tuple.4 = tuple.12
tuple.3 = tuple.13
tuple.2 = tuple.14
tuple.1 = tuple.15
tuple.0 = tuple.16
}
return tuple
}
}
```string.append(Character(UnicodeScalar(tuple.0))) // no exact matches in call to initializertuple.15 = tuple.16 // value of tuple type 'Tuple16' (aka '(Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)') has no member '16'tuple.16 = Int8(character.unicodeScalars.first!.value) // value of tuple type '(Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int)' has no member '16'tuple.0 = tuple.16 // value of tuple type '(Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int)' has no member '16'return tuple // cannot convert return expression of type '(Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int, Int)' to return type 'Tuple16' (aka '(Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)')typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
extension String {
init(tuple16: Tuple16) {
var tuple = tuple16
var string = ""
while tuple.0 != 0 {
string.append(Character(UnicodeScalar(tuple.0)))
tuple.0 = tuple.1
tuple.1 = tuple.2
tuple.2 = tuple.3
tuple.3 = tuple.4
tuple.4 = tuple.5
tuple.5 = tuple.6
tuple.6 = tuple.7
tuple.7 = tuple.8
tuple.8 = tuple.9
tuple.9 = tuple.10
tuple.10 = tuple.11
tuple.11 = tuple.12
tuple.12 = tuple.13
tuple.13 = tuple.14
tuple.14 = tuple.15
tuple.15 = tuple.16
}
self = string
}
}```swift
typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
var tuple = tuple16
var string = ""
while tuple.0 != 0 {
string.append(Character(UnicodeScalar(tuple.0)))
tuple.0 = tuple.1
tuple.1 = tuple.2
tuple.2 = tuple.3
tuple.3 = tuple.4
tuple.4 = tuple.5
tuple.5 = tuple.6
tuple.6 = tuple.7
tuple.7 = tuple.8
tuple.8 = tuple.9
tuple.9 = tuple.10
tuple.10 = tuple.11
tuple.11 = tuple.12
tuple.12 = tuple.13
tuple.13 = tuple.14
tuple.14 = tuple.15
tuple.15 = tuple.16
}
self = string
}
}
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
var tuple = tuple16
var string = ""
while tuple.0 != 0 {
string.append(Character(UnicodeScalar(tuple.0)))
tuple.0 = tuple.1
tuple.1 = tuple.2
tuple.2 = tuple.3
tuple.3 = tuple.4
tuple.4 = tuple.5
tuple.5 = tuple.6
tuple.6 = tuple.7
tuple.7 = tuple.8
tuple.8 = tuple.9
tuple.9 = tuple.10
tuple.10 = tuple.11
tuple.11 = tuple.12
tuple.12 = tuple.13
tuple.13 = tuple.14
tuple.14 = tuple.15
tuple.15 = tuple.16
}
self = string
}
}
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
var tuple = tuple16
var string = ""
while tuple.0 != 0 {
string.append(Character(UnicodeScalar(tuple.0)))
tuple.0 = tuple.1
tuple.1 = tuple.2
tuple.2 = tuple.3
tuple.3 = tuple.4
tuple.4 = tuple.5
tuple.5 = tuple.6
tuple.6 = tuple.7
tuple.7 = tuple.8
tuple.8 = tuple.9
tuple.9 = tuple.10
tuple.10 = tuple.11
tuple.11 = tuple.12
tuple.12 = tuple.13
tuple.13 = tuple.14
tuple.14 = tuple.15
tuple.15 = tuple.16
}
self = string
}
}
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
var tuple = tuple16
var string = ""
while tuple.0 != 0 {
string.append(Character(UnicodeScalar(tuple.0)))
tuple.0 = tuple.1
tuple.1 = tuple.2
tuple.2 = tuple.3
tuple.3 = tuple.4
tuple.4 = tuple.5
tuple.5 = tuple.6
tuple.6 = tuple.7
tuple.7 = tuple.8
tuple.8 = tuple.9
tuple.9 = tuple.10
tuple.10 = tuple.11
tuple.11 = tuple.12
tuple.12 = tuple.13
tuple.13 = tuple.14
tuple.14 = tuple.15
tuple.15 = tuple.16
}
self = string
}
}
// Extension tostring.append(Character(UnicodeScalar(tuple.0))) // no exact matches in call to initializertuple.15 = tuple.16 // value of tuple type 'Tuple16' (aka '(Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)') has no member '16'typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
extension String {
init(tuple16: Tuple16) {
var bytes = [UInt8](repeating: 0, count: 16)
for i in 0..<16 {
bytes[i] = UInt8(tuple16.0 + i)
}
self.init(bytes: bytes, encoding: .ascii)!
}
}
extension Data {
init(tuple16: Tuple16) {
var bytes = [UInt8](repeating: 0, count: 16)
for i in 0..<16 {
bytes[i] = UInt8(tuple16.0 + i)
}
self.init(bytes: bytes)
}
}```swift
typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
var bytes = [UInt8](repeating: 0, count: 16)
for i in 0..<16 {
bytes[i] = UInt8(tuple16.0 + i)
}
self.init(bytes: bytes, encoding: .ascii)!
}
}
// Extension to the Data type that allows initializing a Data from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension Data {
init(tuple16: Tuple16) {
var bytes = [UInt8](repeating: 0, count: 16)
for i in 0..<16 {
bytes[i] = UInt8(tuple16.0 + i)
}
self.init(bytes: bytes)
}
}
// Extension to the Data type that allows initializing a Data from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension Data {
init(tuple16: Tuple16) {
var bytes = [UInt8](repeating: 0, count: 16)
for i in 0..<16 {
bytes[i] = UInt8(tuple16.0 + i)
}
self.init(bytes: bytes)
}
}
// Extension to the Data type that allows initializing a Data from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension Data {
init(tuple16: Tuple16) {
var bytes = [UInt8](repeating: 0, count: 16)
for i in 0..<16 {
bytes[i] = UInt8(tuple16.0 + i)
}
self.init(bytes: bytes)
}
}
// Extension to the Data type that allows initializing a Data from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension Data {
init(tuple16: Tuple16) {
var bytes = [UInt8](repeating: 0, count: 16)
for i in 0..<16 {
bytes[i] = UInt8(tuple16.0 + i)
}
self.init(bytes: bytes)
}
}
// Extension to the Data type that allows initializing a Data from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension Data {
init(tuple16: Tuple16) {
var bytes = [UInt8](repeating: 0, count: 16)
for i in 0..<16 {
bytes[i] = UInt8(tuple16.0 + i)
}
self.init(bytes: bytes)
}
}
// Extension to the Data type that allows initializing a Data from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension Data {
init(tuple16: Tuple16) {
var bytes = [UInt8](repeating: 0, count: 16)
for i in 0..<16 {
bytes[i] = UInt8(tuple16.0 + i)
}
self.init(bytes: bytes)
}
}
// Extension to the Data type that allows initializing a Data from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension Data {
init(tuple16: Tuple16) {
var bytes = [UInt8](repeating: 0, count: 16)
for i in 0..<16 {
bytes[i] = UInt8(tuple16.0 + i)
}
self.init(bytes: bytes)
}
}
// Extension to the Data type that allows initializing a Data from a tuple of 16 Int8 values, where the tuple represents a C-style null-bytes[i] = UInt8(tuple16.0 + i) // binary operator '+' cannot be applied to operands of type 'Int8' and 'Int'bytes[i] = UInt8(tuple16.0 + i) // binary operator '+' cannot be applied to operands of type 'Int8' and 'Int'self.init(bytes: bytes) // 'init(bytes:)' is deprecated: use `init(_:)` insteadtypealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
extension String {
init(tuple16: Tuple16) {
var bytes = [UInt8](repeating: 0, count: 16)
for i in 0..<16 {
bytes[i] = UInt8(tuple16.0 + i)
}
self.init(bytes: bytes, encoding: .utf8)
}
}```swift
typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
var bytes = [UInt8](repeating: 0, count: 16)
for i in 0..<16 {
bytes[i] = UInt8(tuple16.0 + i)
}
self.init(bytes: bytes, encoding: .utf8)
}
}
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
var bytes = [UInt8](repeating: 0, count: 16)
for i in 0..<16 {
bytes[i] = UInt8(tuple16.0 + i)
}
self.init(bytes: bytes, encoding: .utf8)
}
}
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
var bytes = [UInt8](repeating: 0, count: 16)
for i in 0..<16 {
bytes[i] = UInt8(tuple16.0 + i)
}
self.init(bytes: bytes, encoding: .utf8)
}
}
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
var bytes = [UInt8](repeating: 0, count: 16)
for i in 0..<16 {
bytes[i] = UInt8(tuple16.0 + i)
}
self.init(bytes: bytes, encoding: .utf8)
}
}
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
var bytes = [UInt8](repeating: 0, count: 16)
for i in 0..<16 {
bytes[i] = UInt8(tuple16.0 + i)
}
self.init(bytes: bytes, encoding: .utf8)
}
}
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
var bytes = [UInt8](repeating: 0, count: 16)
for i in 0..<16 {
bytes[i] = UInt8(tuple16.0 + i)
}
self.init(bytes: bytes, encoding: .utf8)
}
}
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
var bytes = [UInt8](repeating: 0, count: 16)
for i in 0..<16 {
bytes[i] = UInt8(tuple16.0 + i)
}
self.init(bytes: bytes, encoding: .utf8)
}
}
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
var bytes = [UInt8](repeating: 0, count: 16)
for i in 0..<16 {
bytes[i] = UInt8(tuple16.0 + i)
}
self.init(bytes: bytes, encoding: .utf8bytes[i] = UInt8(tuple16.0 + i) // binary operator '+' cannot be applied to operands of type 'Int8' and 'Int'self.init(bytes: bytes, encoding: .utf8) // a non-failable initializer cannot delegate to failable initializer 'init(bytes:encoding:)' written with 'init?'import CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
var isEqual = false
if lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormatType == rhs.pixelFormatType {
let lhsData = CVPixelBufferGetBaseAddress(lhs)
let rhsData = CVPixelBufferGetBaseAddress(rhs)
if lhsData != nil && rhsData != nil {
isEqual = memcmp(lhsData, rhsData, Int(lhs.width * lhs.height * 4)) == 0
}
}
return isEqual
}```swift
import CoreVideo
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers equal in size, pixel format, and content.
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
var isEqual = false
if lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormatType == rhs.pixelFormatType {
let lhsData = CVPixelBufferGetBaseAddress(lhs)
let rhsData = CVPixelBufferGetBaseAddress(rhs)
if lhsData != nil && rhsData != nil {
isEqual = memcmp(lhsData, rhsData, Int(lhs.width * lhs.height * 4)) == 0
}
}
return isEqual
}
```if lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormatType == rhs.pixelFormatType { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'width'if lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormatType == rhs.pixelFormatType { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'if lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormatType == rhs.pixelFormatType { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'pixelFormatType'if lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormatType == rhs.pixelFormatType { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'width'if lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormatType == rhs.pixelFormatType { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'if lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormatType == rhs.pixelFormatType { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'pixelFormatType'isEqual = memcmp(lhsData, rhsData, Int(lhs.width * lhs.height * 4)) == 0 // cannot convert value of type 'Duration' to expected argument type 'Int'isEqual = memcmp(lhsData, rhsData, Int(lhs.width * lhs.height * 4)) == 0 // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'width'isEqual = memcmp(lhsData, rhsData, Int(lhs.width * lhs.height * 4)) == 0 // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'import CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
var isEqual = false
if lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormatType == rhs.pixelFormatType {
let lhsData = CVPixelBufferGetBaseAddress(lhs)
let rhsData = CVPixelBufferGetBaseAddress(rhs)
if lhsData != nil && rhsData != nil {
isEqual = memcmp(lhsData, rhsData, lhs.bytesPerRow * lhs.height) == 0
}
}
return isEqual
}```swift
import CoreVideo
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers equal in size, pixel format, and content.
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
var isEqual = false
if lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormatType == rhs.pixelFormatType {
let lhsData = CVPixelBufferGetBaseAddress(lhs)
let rhsData = CVPixelBufferGetBaseAddress(rhs)
if lhsData != nil && rhsData != nil {
isEqual = memcmp(lhsData, rhsData, lhs.bytesPerRow * lhs.height) == 0
}
}
return isEqual
}
```if lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormatType == rhs.pixelFormatType { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'width'if lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormatType == rhs.pixelFormatType { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'if lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormatType == rhs.pixelFormatType { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'pixelFormatType'if lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormatType == rhs.pixelFormatType { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'width'if lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormatType == rhs.pixelFormatType { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'if lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormatType == rhs.pixelFormatType { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'pixelFormatType'isEqual = memcmp(lhsData, rhsData, lhs.bytesPerRow * lhs.height) == 0 // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'isEqual = memcmp(lhsData, rhsData, lhs.bytesPerRow * lhs.height) == 0 // cannot convert value of type 'Duration' to expected argument type 'Int'isEqual = memcmp(lhsData, rhsData, lhs.bytesPerRow * lhs.height) == 0 // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'bytesPerRow'import CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
var isEqual = false
if lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormatType == rhs.pixelFormatType {
let lhsData = CVPixelBufferGetBaseAddress(lhs)
let rhsData = CVPixelBufferGetBaseAddress(rhs)
if lhsData != nil && rhsData != nil {
isEqual = memcmp(lhsData, rhsData, Int(lhs.height * lhs.bytesPerRow)) == 0
}
}
return isEqual
}```swift
import CoreVideo
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers equal in size, pixel format, and content.
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
var isEqual = false
if lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormatType == rhs.pixelFormatType {
let lhsData = CVPixelBufferGetBaseAddress(lhs)
let rhsData = CVPixelBufferGetBaseAddress(rhs)
if lhsData != nil && rhsData != nil {
isEqual = memcmp(lhsData, rhsData, Int(lhs.height * lhs.bytesPerRow)) == 0
}
}
return isEqual
}
```if lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormatType == rhs.pixelFormatType { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'width'if lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormatType == rhs.pixelFormatType { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'if lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormatType == rhs.pixelFormatType { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'pixelFormatType'if lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormatType == rhs.pixelFormatType { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'width'if lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormatType == rhs.pixelFormatType { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'if lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormatType == rhs.pixelFormatType { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'pixelFormatType'isEqual = memcmp(lhsData, rhsData, Int(lhs.height * lhs.bytesPerRow)) == 0 // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'isEqual = memcmp(lhsData, rhsData, Int(lhs.height * lhs.bytesPerRow)) == 0 // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'bytesPerRow'isEqual = memcmp(lhsData, rhsData, Int(lhs.height * lhs.bytesPerRow)) == 0 // no exact matches in call to initializerimport CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
var isEqual = false
if lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormatType == rhs.pixelFormatType {
let lhsData = CVPixelBufferGetBaseAddress(lhs)
let rhsData = CVPixelBufferGetBaseAddress(rhs)
if lhsData != nil && rhsData != nil {
isEqual = memcmp(lhsData, rhsData, lhs.bytesPerRow * lhs.height) == 0
}
}
return isEqual
}```swift
import CoreVideo
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers equal in size, pixel format, and content.
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
var isEqual = false
if lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormatType == rhs.pixelFormatType {
let lhsData = CVPixelBufferGetBaseAddress(lhs)
let rhsData = CVPixelBufferGetBaseAddress(rhs)
if lhsData != nil && rhsData != nil {
isEqual = memcmp(lhsData, rhsData, lhs.bytesPerRow * lhs.height) == 0
}
}
return isEqual
}
```if lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormatType == rhs.pixelFormatType { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'width'if lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormatType == rhs.pixelFormatType { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'if lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormatType == rhs.pixelFormatType { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'pixelFormatType'if lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormatType == rhs.pixelFormatType { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'width'if lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormatType == rhs.pixelFormatType { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'if lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormatType == rhs.pixelFormatType { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'pixelFormatType'isEqual = memcmp(lhsData, rhsData, lhs.bytesPerRow * lhs.height) == 0 // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'isEqual = memcmp(lhsData, rhsData, lhs.bytesPerRow * lhs.height) == 0 // cannot convert value of type 'Duration' to expected argument type 'Int'isEqual = memcmp(lhsData, rhsData, lhs.bytesPerRow * lhs.height) == 0 // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'bytesPerRow'import CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
var isEqual = false
if lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormatType == rhs.pixelFormatType {
let lhsData = CVPixelBufferGetBaseAddress(lhs)
let rhsData = CVPixelBufferGetBaseAddress(rhs)
if lhsData != nil && rhsData != nil {
let lhsLength = CVPixelBufferGetDataSize(lhs)
let rhsLength = CVPixelBufferGetDataSize(rhs)
if lhsLength == rhsLength {
isEqual = memcmp(lhsData, rhsData, lhsLength) == 0
}
}
}
return isEqual
}```swift
import CoreVideo
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers equal in size, pixel format, and content.
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
var isEqual = false
if lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormatType == rhs.pixelFormatType {
let lhsData = CVPixelBufferGetBaseAddress(lhs)
let rhsData = CVPixelBufferGetBaseAddress(rhs)
if lhsData != nil && rhsData != nil {
let lhsLength = CVPixelBufferGetDataSize(lhs)
let rhsLength = CVPixelBufferGetDataSize(rhs)
if lhsLength == rhsLength {
isEqual = memcmp(lhsData, rhsData, lhsLength) == 0
}
}
}
return isEqual
}
```if lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormatType == rhs.pixelFormatType { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'width'if lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormatType == rhs.pixelFormatType { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'if lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormatType == rhs.pixelFormatType { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'pixelFormatType'if lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormatType == rhs.pixelFormatType { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'width'if lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormatType == rhs.pixelFormatType { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'if lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormatType == rhs.pixelFormatType { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'pixelFormatType'import CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
var result = true
if lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormatType == rhs.pixelFormatType {
let lhsBytesPerRow = CVPixelBufferGetBytesPerRow(lhs)
let rhsBytesPerRow = CVPixelBufferGetBytesPerRow(rhs)
let lhsBaseAddress = CVPixelBufferGetBaseAddress(lhs)
let rhsBaseAddress = CVPixelBufferGetBaseAddress(rhs)
if lhsBytesPerRow == rhsBytesPerRow && lhsBaseAddress == rhsBaseAddress {
let lhsData = UnsafeMutableRawPointer(mutating: lhsBaseAddress)
let rhsData = UnsafeMutableRawPointer(mutating: rhsBaseAddress)
result = memcmp(lhsData, rhsData, lhsBytesPerRow * lhs.height) == 0
}
}
return result
}```swift
import CoreVideo
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers equal in size, pixel format, and content.
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
var result = true
if lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormatType == rhs.pixelFormatType {
let lhsBytesPerRow = CVPixelBufferGetBytesPerRow(lhs)
let rhsBytesPerRow = CVPixelBufferGetBytesPerRow(rhs)
let lhsBaseAddress = CVPixelBufferGetBaseAddress(lhs)
let rhsBaseAddress = CVPixelBufferGetBaseAddress(rhs)
if lhsBytesPerRow == rhsBytesPerRow && lhsBaseAddress == rhsBaseAddress {
let lhsData = UnsafeMutableRawPointer(mutating: lhsBaseAddress)
let rhsData = UnsafeMutableRawPointer(mutating: rhsBaseAddress)
result = memcmp(lhsData, rhsData, lhsBytesPerRow * lhs.height) == 0
}
}
return result
}
```if lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormatType == rhs.pixelFormatType { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'width'if lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormatType == rhs.pixelFormatType { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'if lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormatType == rhs.pixelFormatType { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'pixelFormatType'if lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormatType == rhs.pixelFormatType { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'width'if lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormatType == rhs.pixelFormatType { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'if lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormatType == rhs.pixelFormatType { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'pixelFormatType'result = memcmp(lhsData, rhsData, lhsBytesPerRow * lhs.height) == 0 // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'import CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
var lhsPixelBuffer: CVPixelBuffer?
var rhsPixelBuffer: CVPixelBuffer?
// Get the pixel buffer from the CVPixelBuffer objects.
CVPixelBufferRetain(lhs, &lhsPixelBuffer)
CVPixelBufferRetain(rhs, &rhsPixelBuffer)
// Check if the pixel buffers are equal in size and pixel format.
let isEqualInSizeAndPixelFormat = lhsPixelBuffer?.width == rhsPixelBuffer?.width && lhsPixelBuffer?.height == rhsPixelBuffer?.height && lhsPixelBuffer?.pixelFormatType == rhsPixelBuffer?.pixelFormatType
// Check if the pixel buffers are equal in content.
let isEqualInContent = lhsPixelBuffer?.compare(rhsPixelBuffer!, with: .exact) ?? false
// Release the pixel buffer objects.
CVPixelBufferRelease(lhsPixelBuffer!)
CVPixelBufferRelease(rhsPixelBuffer!)
// Return true if the pixel buffers are equal in size, pixel format, and content.
return isEqualInSizeAndPixelFormat && isEqualInContent
}```swift
import CoreVideo
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers equal in size, pixel format, and content.
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
var lhsPixelBuffer: CVPixelBuffer?
var rhsPixelBuffer: CVPixelBuffer?
// Get the pixel buffer from the CVPixelBuffer objects.
CVPixelBufferRetain(lhs, &lhsPixelBuffer)
CVPixelBufferRetain(rhs, &rhsPixelBuffer)
// Check if the pixel buffers are equal in size and pixel format.
let isEqualInSizeAndPixelFormat = lhsPixelBuffer?.width == rhsPixelBuffer?.width && lhsPixelBuffer?.height == rhsPixelBuffer?.height && lhsPixelBuffer?.pixelFormatType == rhsPixelBuffer?.pixelFormatType
// Check if the pixel buffers are equal in content.
let isEqualInContent = lhsPixelBuffer?.compare(rhsPixelBuffer!, with: .exact) ?? false
// Release the pixel buffer objects.
CVPixelBufferRelease(lhsPixelBuffer!)
CVPixelBufferRelease(rhsPixelBuffer!)
// Return true if the pixel buffers are equal in size, pixel format, and content.
return isEqualInSizeAndPixelFormat && isEqualInContent
}
```CVPixelBufferRetain(lhs, &lhsPixelBuffer) // extra argument in callCVPixelBufferRetain(rhs, &rhsPixelBuffer) // extra argument in calllet isEqualInSizeAndPixelFormat = lhsPixelBuffer?.width == rhsPixelBuffer?.width && lhsPixelBuffer?.height == rhsPixelBuffer?.height && lhsPixelBuffer?.pixelFormatType == rhsPixelBuffer?.pixelFormatType // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'pixelFormatType'let isEqualInSizeAndPixelFormat = lhsPixelBuffer?.width == rhsPixelBuffer?.width && lhsPixelBuffer?.height == rhsPixelBuffer?.height && lhsPixelBuffer?.pixelFormatType == rhsPixelBuffer?.pixelFormatType // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'width'let isEqualInSizeAndPixelFormat = lhsPixelBuffer?.width == rhsPixelBuffer?.width && lhsPixelBuffer?.height == rhsPixelBuffer?.height && lhsPixelBuffer?.pixelFormatType == rhsPixelBuffer?.pixelFormatType // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'let isEqualInSizeAndPixelFormat = lhsPixelBuffer?.width == rhsPixelBuffer?.width && lhsPixelBuffer?.height == rhsPixelBuffer?.height && lhsPixelBuffer?.pixelFormatType == rhsPixelBuffer?.pixelFormatType // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'width'let isEqualInSizeAndPixelFormat = lhsPixelBuffer?.width == rhsPixelBuffer?.width && lhsPixelBuffer?.height == rhsPixelBuffer?.height && lhsPixelBuffer?.pixelFormatType == rhsPixelBuffer?.pixelFormatType // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'let isEqualInSizeAndPixelFormat = lhsPixelBuffer?.width == rhsPixelBuffer?.width && lhsPixelBuffer?.height == rhsPixelBuffer?.height && lhsPixelBuffer?.pixelFormatType == rhsPixelBuffer?.pixelFormatType // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'pixelFormatType'let isEqualInContent = lhsPixelBuffer?.compare(rhsPixelBuffer!, with: .exact) ?? false // cannot infer contextual base in reference to member 'exact'let isEqualInContent = lhsPixelBuffer?.compare(rhsPixelBuffer!, with: .exact) ?? false // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'compare'CVPixelBufferRelease(lhsPixelBuffer!) // 'CVPixelBufferRelease' is unavailable: Core Foundation objects are automatically memory managedCVPixelBufferRelease(rhsPixelBuffer!) // 'CVPixelBufferRelease' is unavailable: Core Foundation objects are automatically memory managedimport CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
var lhsPixelFormat: OSType = 0
var rhsPixelFormat: OSType = 0
var lhsWidth: Int = 0
var lhsHeight: Int = 0
var rhsWidth: Int = 0
var rhsHeight: Int = 0
var lhsBytesPerRow: Int = 0
var rhsBytesPerRow: Int = 0
var lhsData: UnsafeMutableRawPointer?
var rhsData: UnsafeMutableRawPointer?
var lhsDataLength: Int = 0
var rhsDataLength: Int = 0
var lhsEqual: Bool = false
var rhsEqual: Bool = false
// Get the pixel format, width, height, bytes per row, and data pointer for each pixel buffer.
guard CVPixelBufferGetPixelFormatType(lhs, &lhsPixelFormat) == kCVReturnSuccess,
CVPixelBufferGetWidth(lhs, &lhsWidth) == kCVReturnSuccess,
CVPixelBufferGetHeight(lhs, &lhsHeight) == kCVReturnSuccess,
CVPixelBufferGetBytesPerRow(lhs, &lhsBytesPerRow) == kCVReturnSuccess,
CVPixelBufferGetBaseAddress(lhs, &lhsData) == kCVReturnSuccess,
CVPixelBufferGetPixelFormatType(rhs, &rhsPixelFormat) == kCVReturnSuccess,
CVPixelBufferGetWidth(rhs, &rhsWidth) == kCVReturnSuccess,
CVPixelBufferGetHeight(rhs, &rhsHeight) == kCVReturnSuccess,
CVPixelBufferGetBytesPerRow(rhs, &rhsBytesPerRow) == kCVReturnSuccess,
CVPixelBufferGetBaseAddress(rhs, &rhsData) == kCVReturnSuccess else {
return false
}
// Check if the pixel format, width, height, and bytes per row are equal.
lhsEqual = lhsPixelFormat == rhsPixelFormat && lhsWidth == rhsWidth && lhsHeight == rhsHeight && lhsBytesPerRow == rhsBytesPerRow
// Check if the data is equal.
if lhsEqual {
lhsDataLength = lhsHeight * lhsBytesPerRow
rhsDataLength = rhsHeight * rhsBytesPerRow
lhsEqual = memcmp(lhsData, rhsData, lhsDataLength) == 0
}
return lhsEqual
}```swift
import CoreVideo
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers equal in size, pixel format, and content.
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
var lhsPixelFormat: OSType = 0
var rhsPixelFormat: OSType = 0
var lhsWidth: Int = 0
var lhsHeight: Int = 0
var rhsWidth: Int = 0
var rhsHeight: Int = 0
var lhsBytesPerRow: Int = 0
var rhsBytesPerRow: Int = 0
var lhsData: UnsafeMutableRawPointer?
var rhsData: UnsafeMutableRawPointer?
var lhsDataLength: Int = 0
var rhsDataLength: Int = 0
var lhsEqual: Bool = false
var rhsEqual: Bool = false
// Get the pixel format, width, height, bytes per row, and data pointer for each pixel buffer.
guard CVPixelBufferGetPixelFormatType(lhs, &lhsPixelFormat) == kCVReturnSuccess,
CVPixelBufferGetWidth(lhs, &lhsWidth) == kCVReturnSuccess,
CVPixelBufferGetHeight(lhs, &lhsHeight) == kCVReturnSuccess,
CVPixelBufferGetBytesPerRow(lhs, &lhsBytesPerRow) == kCVReturnSuccess,
CVPixelBufferGetBaseAddress(lhs, &lhsData) == kCVReturnSuccess,
CVPixelBufferGetPixelFormatType(rhs, &rhsPixelFormat) == kCVReturnSuccess,
CVPixelBufferGetWidth(rhs, &rhsWidth) == kCVReturnSuccess,
CVPixelBufferGetHeight(rhs, &rhsHeight) == kCVReturnSuccess,
CVPixelBufferGetBytesPerRow(rhs, &rhsBytesPerRow) == kCVReturnSuccess,
CVPixelBufferGetBaseAddress(rhs, &rhsData) == kCVReturnSuccess else {
return false
}
// Check if the pixel format, width, height, and bytes per row are equal.
lhsEqual = lhsPixelFormat == rhsPixelFormat && lhsWidth == rhsWidth && lhsHeight == rhsHeight && lhsBytesPerRow == rhsBytesPerRow
// Check if the data is equal.
if lhsEqual {
lhsDataLength = lhsHeight * lhsBytesPerRow
rhsDataLength = rhsHeight * rhsBytesPerRow
lhsEqual = memcmp(lhsData, rhsData, lhsDataLength) == 0
}
return lhsEqual
}
```guard CVPixelBufferGetPixelFormatType(lhs, &lhsPixelFormat) == kCVReturnSuccess, // extra argument in callCVPixelBufferGetWidth(lhs, &lhsWidth) == kCVReturnSuccess, // extra argument in callCVPixelBufferGetHeight(lhs, &lhsHeight) == kCVReturnSuccess, // extra argument in callCVPixelBufferGetBytesPerRow(lhs, &lhsBytesPerRow) == kCVReturnSuccess, // extra argument in callCVPixelBufferGetBaseAddress(lhs, &lhsData) == kCVReturnSuccess, // cannot convert value of type 'UnsafeMutableRawPointer?' to expected argument type 'Int32'CVPixelBufferGetBaseAddress(lhs, &lhsData) == kCVReturnSuccess, // extra argument in callCVPixelBufferGetPixelFormatType(rhs, &rhsPixelFormat) == kCVReturnSuccess, // extra argument in callCVPixelBufferGetWidth(rhs, &rhsWidth) == kCVReturnSuccess, // extra argument in callCVPixelBufferGetHeight(rhs, &rhsHeight) == kCVReturnSuccess, // extra argument in callCVPixelBufferGetBytesPerRow(rhs, &rhsBytesPerRow) == kCVReturnSuccess, // extra argument in callCVPixelBufferGetBaseAddress(rhs, &rhsData) == kCVReturnSuccess else { // cannot convert value of type 'UnsafeMutableRawPointer?' to expected argument type 'Int32'CVPixelBufferGetBaseAddress(rhs, &rhsData) == kCVReturnSuccess else { // extra argument in callimport CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
var result = true
if lhs.width != rhs.width || lhs.height != rhs.height || lhs.pixelFormatType != rhs.pixelFormatType {
result = false
} else {
let lhsData = CVPixelBufferGetBaseAddress(lhs)
let rhsData = CVPixelBufferGetBaseAddress(rhs)
if lhsData == rhsData {
result = true
} else {
let lhsDataLength = CVPixelBufferGetDataSize(lhs)
let rhsDataLength = CVPixelBufferGetDataSize(rhs)
if lhsDataLength != rhsDataLength {
result = false
} else {
let lhsDataPtr = lhsData?.assumingMemoryBound(to: UInt8.self)
let rhsDataPtr = rhsData?.assumingMemoryBound(to: UInt8.self)
for i in 0..<lhsDataLength {
if lhsDataPtr?[i] != rhsDataPtr?[i] {
result = false
break
}
}
}
}
}
return result
}```swift
import CoreVideo
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers equal in size, pixel format, and content.
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
var result = true
if lhs.width != rhs.width || lhs.height != rhs.height || lhs.pixelFormatType != rhs.pixelFormatType {
result = false
} else {
let lhsData = CVPixelBufferGetBaseAddress(lhs)
let rhsData = CVPixelBufferGetBaseAddress(rhs)
if lhsData == rhsData {
result = true
} else {
let lhsDataLength = CVPixelBufferGetDataSize(lhs)
let rhsDataLength = CVPixelBufferGetDataSize(rhs)
if lhsDataLength != rhsDataLength {
result = false
} else {
let lhsDataPtr = lhsData?.assumingMemoryBound(to: UInt8.self)
let rhsDataPtr = rhsData?.assumingMemoryBound(to: UInt8.self)
for i in 0..<lhsDataLength {
if lhsDataPtr?[i] != rhsDataPtr?[i] {
result = false
break
}
}
}
}
}
return result
}
```if lhs.width != rhs.width || lhs.height != rhs.height || lhs.pixelFormatType != rhs.pixelFormatType { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'if lhs.width != rhs.width || lhs.height != rhs.height || lhs.pixelFormatType != rhs.pixelFormatType { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'width'if lhs.width != rhs.width || lhs.height != rhs.height || lhs.pixelFormatType != rhs.pixelFormatType { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'if lhs.width != rhs.width || lhs.height != rhs.height || lhs.pixelFormatType != rhs.pixelFormatType { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'pixelFormatType'if lhs.width != rhs.width || lhs.height != rhs.height || lhs.pixelFormatType != rhs.pixelFormatType { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'pixelFormatType'if lhs.width != rhs.width || lhs.height != rhs.height || lhs.pixelFormatType != rhs.pixelFormatType { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'width'import CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
var isEqual = false
if lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormatType == rhs.pixelFormatType {
let lhsData = CVPixelBufferGetBaseAddress(lhs)
let rhsData = CVPixelBufferGetBaseAddress(rhs)
if lhsData != nil && rhsData != nil {
isEqual = memcmp(lhsData, rhsData, Int(lhs.width * lhs.height * 4)) == 0
}
}
return isEqual
}```swift
import CoreVideo
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers equal in size, pixel format, and content.
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
var isEqual = false
if lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormatType == rhs.pixelFormatType {
let lhsData = CVPixelBufferGetBaseAddress(lhs)
let rhsData = CVPixelBufferGetBaseAddress(rhs)
if lhsData != nil && rhsData != nil {
isEqual = memcmp(lhsData, rhsData, Int(lhs.width * lhs.height * 4)) == 0
}
}
return isEqual
}
```if lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormatType == rhs.pixelFormatType { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'width'if lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormatType == rhs.pixelFormatType { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'if lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormatType == rhs.pixelFormatType { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'pixelFormatType'if lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormatType == rhs.pixelFormatType { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'width'if lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormatType == rhs.pixelFormatType { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'if lhs.width == rhs.width && lhs.height == rhs.height && lhs.pixelFormatType == rhs.pixelFormatType { // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'pixelFormatType'isEqual = memcmp(lhsData, rhsData, Int(lhs.width * lhs.height * 4)) == 0 // cannot convert value of type 'Duration' to expected argument type 'Int'isEqual = memcmp(lhsData, rhsData, Int(lhs.width * lhs.height * 4)) == 0 // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'width'isEqual = memcmp(lhsData, rhsData, Int(lhs.width * lhs.height * 4)) == 0 // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'struct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] {
let count = items.count
let itemsPtr = UnsafeMutablePointer<PrivateItem>(mutating: items)
let itemsPtr2 = UnsafeMutablePointer<PublicItem>(mutating: itemsPtr)
for i in 0..<count {
itemsPtr2[i].value = itemsPtr[i].value
}
return UnsafeMutableBufferPointer(start: itemsPtr2, count: count).move()
}```swift
struct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
// Function to convert an array of structs with private integer fields into an array of public structs with identical integer fields by directly reinterpreting memory, assuming the structs have the same memory layout and alignment.
func reveal(items: [PrivateItem]) -> [PublicItem] {
let count = items.count
let itemsPtr = UnsafeMutablePointer<PrivateItem>(mutating: items)
let itemsPtr2 = UnsafeMutablePointer<PublicItem>(mutating: itemsPtr)
for i in 0..<count {
itemsPtr2[i].value = itemsPtr[i].value
}
return UnsafeMutableBufferPointer(start: itemsPtr2, count: count).move()
}
// Test
let items = [PrivateItem(value: 1), PrivateItem(value: 2), PrivateItem(value: 3)]
let revealed = reveal(items: items)
print(revealed) // [PublicItem(value: 1), PublicItem(value: 2), PublicItem(value: 3)]
```let itemsPtr = UnsafeMutablePointer<PrivateItem>(mutating: items) // initialization of 'UnsafeMutablePointer<PrivateItem>' results in a dangling pointerlet itemsPtr2 = UnsafeMutablePointer<PublicItem>(mutating: itemsPtr) // cannot convert value of type 'UnsafeMutablePointer<PrivateItem>' to expected argument type 'UnsafePointer<PublicItem>'itemsPtr2[i].value = itemsPtr[i].value // 'value' is inaccessible due to 'private' protection levelreturn UnsafeMutableBufferPointer(start: itemsPtr2, count: count).move() // generic parameter 'Element' could not be inferredreturn UnsafeMutableBufferPointer(start: itemsPtr2, count: count).move() // value of type 'UnsafeMutableBufferPointer<Element>' has no member 'move'struct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] {
let count = items.count
let result = UnsafeMutablePointer<PublicItem>.allocate(capacity: count)
for i in 0..<count {
result[i] = PublicItem(value: items[i].value)
}
return UnsafeBufferPointer(start: result, count: count).map { $0 }
}```swift
struct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
// Function to convert an array of structs with private integer fields into an array of public structs with identical integer fields by directly reinterpreting memory, assuming the structs have the same memory layout and alignment.
func reveal(items: [PrivateItem]) -> [PublicItem] {
let count = items.count
let result = UnsafeMutablePointer<PublicItem>.allocate(capacity: count)
for i in 0..<count {
result[i] = PublicItem(value: items[i].value)
}
return UnsafeBufferPointer(start: result, count: count).map { $0 }
}
// Test
let items = [PrivateItem(value: 1), PrivateItem(value: 2), PrivateItem(value: 3)]
let revealed = reveal(items: items)
print(revealed) // [PublicItem(value: 1), PublicItem(value: 2), PublicItem(value: 3)]
```result[i] = PublicItem(value: items[i].value) // 'value' is inaccessible due to 'private' protection levelstruct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] {
return items.withUnsafeBufferPointer {
$0.baseAddress!.withMemoryRebound(to: PublicItem.self, capacity: $0.count) {
Array(UnsafeBufferPointer(start: $0, count: $0.count))
}
}
}```swift
struct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
// Function to convert an array of structs with private integer fields into an array of public structs with identical integer fields by directly reinterpreting memory, assuming the structs have the same memory layout and alignment.
func reveal(items: [PrivateItem]) -> [PublicItem] {
return items.withUnsafeBufferPointer {
$0.baseAddress!.withMemoryRebound(to: PublicItem.self, capacity: $0.count) {
Array(UnsafeBufferPointer(start: $0, count: $0.count))
}
}
}
// Example usage
let privateItems = [PrivateItem(value: 1), PrivateItem(value: 2), PrivateItem(value: 3)]
let publicItems = reveal(items: privateItems)
print(publicItems) // [PublicItem(value: 1), PublicItem(value: 2), PublicItem(value: 3)]
```Array(UnsafeBufferPointer(start: $0, count: $0.count)) // value of type 'UnsafePointer<PublicItem>' has no member 'count'struct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] {
return withUnsafePointer(to: &items) {
$0.withMemoryRebound(to: PublicItem.self, capacity: items.count) {
Array(UnsafeBufferPointer(start: $0, count: items.count))
}
}
}
func conceal(items: [PublicItem]) -> [PrivateItem] {
return withUnsafePointer(to: &items) {
$0.withMemoryRebound(to: PrivateItem.self, capacity: items.count) {
Array(UnsafeBufferPointer(start: $0, count: items.count))
}
}
}```swift
struct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
// Function to convert an array of structs with private integer fields into an array of public structs with identical integer fields by directly reinterpreting memory, assuming the structs have the same memory layout and alignment.
func reveal(items: [PrivateItem]) -> [PublicItem] {
return withUnsafePointer(to: &items) {
$0.withMemoryRebound(to: PublicItem.self, capacity: items.count) {
Array(UnsafeBufferPointer(start: $0, count: items.count))
}
}
}
// Function to convert an array of structs with public integer fields into an array of structs with private integer fields by directly reinterpreting memory, assuming the structs have the same memory layout and alignment.
func conceal(items: [PublicItem]) -> [PrivateItem] {
return withUnsafePointer(to: &items) {
$0.withMemoryRebound(to: PrivateItem.self, capacity: items.count) {
Array(UnsafeBufferPointer(start: $0, count: items.count))
}
}
}
// Example usage
let privateItems = [PrivateItem(value: 1), PrivateItem(value: 2), PrivateItem(value: 3)]
let publicItems = reveal(items: privateItems)
let concealedPrivateItems = conceal(items: publicItems)
print(privateItems == concealedPrivateItems) // true
```return withUnsafePointer(to: &items) { // cannot pass immutable value as inout argument: 'items' is a 'let' constantreturn withUnsafePointer(to: &items) { // cannot pass immutable value as inout argument: 'items' is a 'let' constantstruct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] {
let count = items.count
let result = UnsafeMutablePointer<PublicItem>.allocate(capacity: count)
let itemsPtr = UnsafeMutablePointer<PrivateItem>(mutating: items)
for i in 0..<count {
result[i] = PublicItem(value: itemsPtr[i].value)
}
return UnsafeBufferPointer(start: result, count: count).map { $0 }
}```swift
struct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
// Function to convert an array of structs with private integer fields into an array of public structs with identical integer fields by directly reinterpreting memory, assuming the structs have the same memory layout and alignment.
func reveal(items: [PrivateItem]) -> [PublicItem] {
let count = items.count
let result = UnsafeMutablePointer<PublicItem>.allocate(capacity: count)
let itemsPtr = UnsafeMutablePointer<PrivateItem>(mutating: items)
for i in 0..<count {
result[i] = PublicItem(value: itemsPtr[i].value)
}
return UnsafeBufferPointer(start: result, count: count).map { $0 }
}
let items = [PrivateItem(value: 1), PrivateItem(value: 2), PrivateItem(value: 3)]
let revealed = reveal(items: items)
print(revealed) // [PublicItem(value: 1), PublicItem(value: 2), PublicItem(value: 3)]
```let itemsPtr = UnsafeMutablePointer<PrivateItem>(mutating: items) // initialization of 'UnsafeMutablePointer<PrivateItem>' results in a dangling pointerresult[i] = PublicItem(value: itemsPtr[i].value) // 'value' is inaccessible due to 'private' protection levelstruct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] {
let count = items.count
let itemsPtr = UnsafeMutablePointer<PrivateItem>(mutating: items)
let publicItemsPtr = UnsafeMutablePointer<PublicItem>(allocatingCapacity: count)
for i in 0..<count {
publicItemsPtr[i] = PublicItem(value: itemsPtr[i].value)
}
return Array(UnsafeBufferPointer(start: publicItemsPtr, count: count))
}```swift
struct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
// Function to convert an array of structs with private integer fields into an array of public structs with identical integer fields by directly reinterpreting memory, assuming the structs have the same memory layout and alignment.
func reveal(items: [PrivateItem]) -> [PublicItem] {
let count = items.count
let itemsPtr = UnsafeMutablePointer<PrivateItem>(mutating: items)
let publicItemsPtr = UnsafeMutablePointer<PublicItem>(allocatingCapacity: count)
for i in 0..<count {
publicItemsPtr[i] = PublicItem(value: itemsPtr[i].value)
}
return Array(UnsafeBufferPointer(start: publicItemsPtr, count: count))
}
// Example usage:
let privateItems = [PrivateItem(value: 1), PrivateItem(value: 2), PrivateItem(value: 3)]
let publicItems = reveal(items: privateItems)
print(publicItems) // [PublicItem(value: 1), PublicItem(value: 2), PublicItem(value: 3)]
```let itemsPtr = UnsafeMutablePointer<PrivateItem>(mutating: items) // initialization of 'UnsafeMutablePointer<PrivateItem>' results in a dangling pointerlet publicItemsPtr = UnsafeMutablePointer<PublicItem>(allocatingCapacity: count) // incorrect argument label in call (have 'allocatingCapacity:', expected 'bitPattern:')publicItemsPtr[i] = PublicItem(value: itemsPtr[i].value) // 'value' is inaccessible due to 'private' protection levelstruct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] {
let count = items.count
let buffer = UnsafeMutablePointer<PrivateItem>.allocate(capacity: count)
buffer.initialize(from: items, count: count)
let publicBuffer = UnsafeMutablePointer<PublicItem>.allocate(capacity: count)
for i in 0..<count {
publicBuffer[i] = PublicItem(value: buffer[i].value)
}
return Array(UnsafeBufferPointer(start: publicBuffer, count: count))
}```swift
struct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
// Function to convert an array of structs with private integer fields into an array of public structs with identical integer fields by directly reinterpreting memory, assuming the structs have the same memory layout and alignment.
func reveal(items: [PrivateItem]) -> [PublicItem] {
let count = items.count
let buffer = UnsafeMutablePointer<PrivateItem>.allocate(capacity: count)
buffer.initialize(from: items, count: count)
let publicBuffer = UnsafeMutablePointer<PublicItem>.allocate(capacity: count)
for i in 0..<count {
publicBuffer[i] = PublicItem(value: buffer[i].value)
}
return Array(UnsafeBufferPointer(start: publicBuffer, count: count))
}
let privateItems = [PrivateItem(value: 1), PrivateItem(value: 2), PrivateItem(value: 3)]
let publicItems = reveal(items: privateItems)
print(publicItems) // [PublicItem(value: 1), PublicItem(value: 2), PublicItem(value: 3)]
```publicBuffer[i] = PublicItem(value: buffer[i].value) // 'value' is inaccessible due to 'private' protection levelstruct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] {
return unsafeBitCast(items, to: [PublicItem].self)
}
func conceal(items: [PublicItem]) -> [PrivateItem] {
return unsafeBitCast(items, to: [PrivateItem].self)
}```swift
struct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
// Function to convert an array of structs with private integer fields into an array of public structs with identical integer fields by directly reinterpreting memory, assuming the structs have the same memory layout and alignment.
func reveal(items: [PrivateItem]) -> [PublicItem] {
return unsafeBitCast(items, to: [PublicItem].self)
}
// Function to convert an array of structs with public integer fields into an array of private structs with identical integer fields by directly reinterpreting memory, assuming the structs have the same memory layout and alignment.
func conceal(items: [PublicItem]) -> [PrivateItem] {
return unsafeBitCast(items, to: [PrivateItem].self)
}
// Testing the functions
let privateItems = [PrivateItem(value: 1), PrivateItem(value: 2), PrivateItem(value: 3)]
let publicItems = reveal(items: privateItems)
print(publicItems) // [PublicItem(value: 1), PublicItem(value: 2), PublicItem(value: 3)]
let concealedPrivateItems = conceal(items: publicItems)
print(concealedPrivateItems) // [PrivateItem(value: 1), PrivateItem(value: 2), PrivateItem(value: 3)]
```struct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] {
return withUnsafePointer(to: &items) {
$0.withMemoryRebound(to: PublicItem.self, capacity: items.count) {
Array(UnsafeBufferPointer(start: $0, count: items.count))
}
}
}
func conceal(items: [PublicItem]) -> [PrivateItem] {
return withUnsafePointer(to: &items) {
$0.withMemoryRebound(to: PrivateItem.self, capacity: items.count) {
Array(UnsafeBufferPointer(start: $0, count: items.count))
}
}
}```swift
struct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
// Function to convert an array of structs with private integer fields into an array of public structs with identical integer fields by directly reinterpreting memory, assuming the structs have the same memory layout and alignment.
func reveal(items: [PrivateItem]) -> [PublicItem] {
return withUnsafePointer(to: &items) {
$0.withMemoryRebound(to: PublicItem.self, capacity: items.count) {
Array(UnsafeBufferPointer(start: $0, count: items.count))
}
}
}
// Function to convert an array of structs with public integer fields into an array of structs with private integer fields by directly reinterpreting memory, assuming the structs have the same memory layout and alignment.
func conceal(items: [PublicItem]) -> [PrivateItem] {
return withUnsafePointer(to: &items) {
$0.withMemoryRebound(to: PrivateItem.self, capacity: items.count) {
Array(UnsafeBufferPointer(start: $0, count: items.count))
}
}
}
let items = [PrivateItem(value: 1), PrivateItem(value: 2), PrivateItem(value: 3)]
let revealed = reveal(items: items)
let concealed = conceal(items: revealed)
print(items) // [PrivateItem(value: 1), PrivateItem(value: 2), PrivateItem(value: 3)]
print(revealed) // [PublicItem(value: 1), PublicItem(value: 2), PublicItem(value: 3)]
print(concealed) // [PrivateItem(value: 1), PrivateItem(value: 2), PrivateItem(value: 3)]
```return withUnsafePointer(to: &items) { // cannot pass immutable value as inout argument: 'items' is a 'let' constantreturn withUnsafePointer(to: &items) { // cannot pass immutable value as inout argument: 'items' is a 'let' constantstruct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] {
let count = items.count
let buffer = UnsafeMutablePointer<PrivateItem>.allocate(capacity: count)
buffer.initialize(from: items, count: count)
let buffer2 = UnsafeMutablePointer<PublicItem>.allocate(capacity: count)
buffer2.initialize(repeating: PublicItem(value: 0), count: count)
memcpy(buffer2, buffer, count * MemoryLayout<PrivateItem>.stride)
buffer.deinitialize(count: count)
buffer.deallocate()
return Array(UnsafeBufferPointer(start: buffer2, count: count))
}```swift
struct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
// Function to convert an array of structs with private integer fields into an array of public structs with identical integer fields by directly reinterpreting memory, assuming the structs have the same memory layout and alignment.
func reveal(items: [PrivateItem]) -> [PublicItem] {
let count = items.count
let buffer = UnsafeMutablePointer<PrivateItem>.allocate(capacity: count)
buffer.initialize(from: items, count: count)
let buffer2 = UnsafeMutablePointer<PublicItem>.allocate(capacity: count)
buffer2.initialize(repeating: PublicItem(value: 0), count: count)
memcpy(buffer2, buffer, count * MemoryLayout<PrivateItem>.stride)
buffer.deinitialize(count: count)
buffer.deallocate()
return Array(UnsafeBufferPointer(start: buffer2, count: count))
}
// Example usage:
let items = [PrivateItem(value: 1), PrivateItem(value: 2), PrivateItem(value: 3)]
let revealed = reveal(items: items)
print(revealed) // [PublicItem(value: 1), PublicItem(value: 2), PublicItem(value: 3)]
```enum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}```swift
enum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
let lhsComponents = lhs.components(separatedBy: ".")
let rhsComponents = rhs.components(separatedBy: ".")
var lhsIndex = 0
var rhsIndex = 0
while lhsIndex < lhsComponents.count && rhsIndex < rhsComponents.count {
let lhsComponent = lhsComponents[lhsIndex]
let rhsComponent = rhsComponents[rhsIndex]
if lhsComponent == "alpha" && rhsComponent != "alpha" {
return .orderedAscending
}
if lhsComponent != "alpha" && rhsComponent == "alpha" {
return .orderedDescending
}
if lhsComponent == "beta" && rhsComponent != "beta" {
return .orderedAscending
}
if lhsComponent != "beta" && rhsComponent == "beta" {
return .orderedDescending
}
if lhsComponent == "rc" && rhsComponent != "rc" {
return .orderedAscending
}
if lhsComponent != "rc" && rhsComponent == "rc" {
return .orderedDescending
}
if lhsComponent == "dev" && rhsComponent != "dev" {
return .orderedAscending
}
if lhsComponent != "dev" && rhsComponent == "dev" {
return .orderedDescending
}
if lhsComponent == "nightly" && rhsComponent != "nightly" {
return .orderedAscending
}
if lhsComponent != "nightly" && rhsComponent == "nightly" {
return .orderedDescending
}
if lhsComponent == "pre" && rhsComponent != "pre" {
return .orderedAscending
}
if lhsComponent != "pre" && rhsComponent == "pre" {
return .orderedDescending
}
if lhsComponent == "pre-release" && rhsComponent != "pre-release" {
return .orderedAscending
}
if lhsComponent != "pre-release" && rhsComponent == "pre-release" {
return .orderedDescending
}
if lhsComponent == "pre-release-candidate" && rhsComponent != "pre-release-candidate" {
return .orderedAscending
}
if lhsComponent != "pre-release-candidate" && rhsComponent == "pre-release-candidate" {
return .orderedDescending
}
if lhsComponent == "pre-release-candidate-rc" && rhsComponent != "pre-release-candidate-rc" {
return .orderedAscending
}
if lhsComponent != "pre-release-candidate-rc" && rhsComponent == "pre-release-candidate-rc" {
return .orderedDescending
}
if lhsComponent == "pre-release-candidate-beta" && rhsComponent != "pre-release-candidate-beta" {
return .orderedAscending
}
if lhsComponent != "pre-release-candidate-beta" && rhsComponent == "pre-release-candidate-beta" {
return .orderedDescending
}
if lhsComponent == "pre-release-candidate-alpha" && rhsComponent != "pre-release-candidate-alpha" {
return .orderedAscending
}
if lhsComponent != "pre-release-candidate-alpha" && rhsComponent == "pre-release-candidate-alpha" {
return .orderedDescending
}
if lhsComponent == "pre-release-candidate-dev" && rhsComponent != "pre-release-candidate-dev" {
return .orderedAscending
}
if lhsComponent != "pre-release-candidate-dev" && rhsComponent == "pre-release-candidate-dev" {
return .orderedDescending
}
if lhsComponent == "pre-release-candidate-nightly" && rhsComponent != "pre-release-candidate-nightly" {
return .orderedAscending
}
if lhsComponent != "pre-release-candidate-nightly" && rhsComponent == "pre-release-XCTAssertTrue(compareVersions("1", "1.0.0") == .orderedSame) // cannot find 'compareVersions' in scopeXCTAssertTrue(compareVersions("1", "1.0.1") == .orderedAscending) // cannot find 'compareVersions' in scopeXCTAssertTrue(compareVersions("1.10", "1.11.0") == .orderedAscending) // cannot find 'compareVersions' in scopeXCTAssertTrue(compareVersions("1.10", "0.1") == .orderedDescending) // cannot find 'compareVersions' in scopeXCTAssertTrue(compareVersions("1.1-alpha", "1.1-beta") == .orderedAscending) // cannot find 'compareVersions' in scopeXCTAssertTrue(compareVersions("1.1-beta", "1.1") == .orderedAscending) // cannot find 'compareVersions' in scopeenum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
let lhsComponents = lhs.components(separatedBy: ".")
let rhsComponents = rhs.components(separatedBy: ".")
for (lhsComponent, rhsComponent) in zip(lhsComponents, rhsComponents) {
if lhsComponent == rhsComponent {
continue
}
if lhsComponent.hasPrefix("alpha") && rhsComponent.hasPrefix("beta") {
return .orderedAscending
}
if lhsComponent.hasPrefix("beta") && rhsComponent.hasPrefix("alpha") {
return .orderedDescending
}
if lhsComponent.hasPrefix("alpha") {
return .orderedDescending
}
if rhsComponent.hasPrefix("alpha") {
return .orderedAscending
}
if lhsComponent.hasPrefix("beta") {
return .orderedDescending
}
if rhsComponent.hasPrefix("beta") {
return .orderedAscending
}
let lhsInt = Int(lhsComponent)
let rhsInt = Int(rhsComponent)
if lhsInt == rhsInt {
continue
}
return lhsInt! < rhsInt! ? .orderedAscending : .orderedDescending
}
return lhsComponents.count == rhsComponents.count ? .orderedSame : lhsComponents.count < rhsComponents.count ? .orderedAscending : .orderedDescending
}```swift
enum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
let lhsComponents = lhs.components(separatedBy: ".")
let rhsComponents = rhs.components(separatedBy: ".")
for (lhsComponent, rhsComponent) in zip(lhsComponents, rhsComponents) {
if lhsComponent == rhsComponent {
continue
}
if lhsComponent.hasPrefix("alpha") && rhsComponent.hasPrefix("beta") {
return .orderedAscending
}
if lhsComponent.hasPrefix("beta") && rhsComponent.hasPrefix("alpha") {
return .orderedDescending
}
if lhsComponent.hasPrefix("alpha") {
return .orderedDescending
}
if rhsComponent.hasPrefix("alpha") {
return .orderedAscending
}
if lhsComponent.hasPrefix("beta") {
return .orderedDescending
}
if rhsComponent.hasPrefix("beta") {
return .orderedAscending
}
let lhsInt = Int(lhsComponent)
let rhsInt = Int(rhsComponent)
if lhsInt == rhsInt {
continue
}
return lhsInt! < rhsInt! ? .orderedAscending : .orderedDescending
}
return lhsComponents.count == rhsComponents.count ? .orderedSame : lhsComponents.count < rhsComponents.count ? .orderedAscending : .orderedDescending
}
// Tests
compareVersions("1.0.0", "1.0.0") // .orderedSame
compareVersions("1.0.0", "1.0.1") // .orderedAscending
compareVersions("1.0.1", "1.0.0") // .orderedDescending
compareVersions("1.0.1-alpha", "1.0.1-beta") // .orderedAscending
compareVersions("1.0.1-beta", "1.0.1-alpha") // .orderedDescending
compareVersions("1.0.1-alpha", "1.0.1") // .orderedDescending
compareVersions("1.0.1", "1.0.1-alpha") // .orderedAscending
compareVersions("1.0.1-beta", "1.0.1") // .orderedDescending
compareVersions("1.0.1", "1.0.1-beta") // .orderedAscending
compareVersions("1.0.1-alpha", "1.0.1-beta") // .orderedAscending
compareVersions("1.0.1-beta", "1.0.1-alpha") // .orderedDescending
compareVersions("1.0.1-alpha", "1.0.1-alpha") // .orderedSame
compareVersions("1.0.1-beta", "1.0.1-beta") // .orderedSame
compareVersions("1.0.1-alpha", "1.0.1-beta-1") // .orderedAscending
compareVersions("1.0.1-beta-1", "1.0.1-alpha") // .orderedDescending
compareVersions("1.0.1-beta-1", "1.0.1-beta") // .orderedAscending
compareVersions("1.0.1-beta", "1.0.1-beta-1") // .orderedDescending
compareVersions("1.0.1-beta-1", "1.0.1-beta-2") // .orderedAscending
compareVersions("1.0.1-beta-2", "1.0.1-beta-1") // .orderedDescending
compareVersions("1.0.1-beta-1", "1.0.1-beta-11") // .orderedAscending
compareVersions("1.0.1-beta-11", "1.0.1-beta-1") // .orderedDescending
compareVersions("1.0.1-beta-2", "1.0.1-beta-11") // .orderedAscending
compareVersions("1.0.1-beta-11", "1.0. // XCTAssertTrue failedenum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
let lhsComponents = lhs.components(separatedBy: ".")
let rhsComponents = rhs.components(separatedBy: ".")
var lhsIndex = 0
var rhsIndex = 0
while lhsIndex < lhsComponents.count && rhsIndex < rhsComponents.count {
let lhsComponent = lhsComponents[lhsIndex]
let rhsComponent = rhsComponents[rhsIndex]
if lhsComponent == rhsComponent {
lhsIndex += 1
rhsIndex += 1
continue
}
if lhsComponent.hasPrefix("alpha") && rhsComponent.hasPrefix("beta") {
return .orderedAscending
}
if lhsComponent.hasPrefix("beta") && rhsComponent.hasPrefix("alpha") {
return .orderedDescending
}
if lhsComponent.hasPrefix("alpha") && !rhsComponent.hasPrefix("alpha") {
return .orderedDescending
}
if rhsComponent.hasPrefix("alpha") && !lhsComponent.hasPrefix("alpha") {
return .orderedAscending
}
if lhsComponent.hasPrefix("beta") && !rhsComponent.hasPrefix("beta") {
return .orderedDescending
}
if rhsComponent.hasPrefix("beta") && !lhsComponent.hasPrefix("beta") {
return .orderedAscending
}
if let lhsComponentNumber = Int(lhsComponent), let rhsComponentNumber = Int(rhsComponent) {
if lhsComponentNumber < rhsComponentNumber {
return .orderedAscending
}
if lhsComponentNumber > rhsComponentNumber {
return .orderedDescending
}
}
lhsIndex += 1
rhsIndex += 1
}
if lhsIndex < lhsComponents.count {
return .orderedDescending
}
if rhsIndex < rhsComponents.count {
return .orderedAscending
}
return .orderedSame
}```swift
enum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
let lhsComponents = lhs.components(separatedBy: ".")
let rhsComponents = rhs.components(separatedBy: ".")
var lhsIndex = 0
var rhsIndex = 0
while lhsIndex < lhsComponents.count && rhsIndex < rhsComponents.count {
let lhsComponent = lhsComponents[lhsIndex]
let rhsComponent = rhsComponents[rhsIndex]
if lhsComponent == rhsComponent {
lhsIndex += 1
rhsIndex += 1
continue
}
if lhsComponent.hasPrefix("alpha") && rhsComponent.hasPrefix("beta") {
return .orderedAscending
}
if lhsComponent.hasPrefix("beta") && rhsComponent.hasPrefix("alpha") {
return .orderedDescending
}
if lhsComponent.hasPrefix("alpha") && !rhsComponent.hasPrefix("alpha") {
return .orderedDescending
}
if rhsComponent.hasPrefix("alpha") && !lhsComponent.hasPrefix("alpha") {
return .orderedAscending
}
if lhsComponent.hasPrefix("beta") && !rhsComponent.hasPrefix("beta") {
return .orderedDescending
}
if rhsComponent.hasPrefix("beta") && !lhsComponent.hasPrefix("beta") {
return .orderedAscending
}
if let lhsComponentNumber = Int(lhsComponent), let rhsComponentNumber = Int(rhsComponent) {
if lhsComponentNumber < rhsComponentNumber {
return .orderedAscending
}
if lhsComponentNumber > rhsComponentNumber {
return .orderedDescending
}
}
lhsIndex += 1
rhsIndex += 1
}
if lhsIndex < lhsComponents.count {
return .orderedDescending
}
if rhsIndex < rhsComponents.count {
return .orderedAscending
}
return .orderedSame
}
// Tests
compareVersions("1.0.0", "1.0.0") // .orderedSame
compareVersions("1.0.0", "1.0.1") // .orderedAscending
compareVersions("1.0.1", "1.0.0") // .orderedDescending
compareVersions("1.0.1", "1.0.2") // .orderedAscending
compareVersions("1.0.2", "1.0.1") // .orderedDescending
compareVersions("1.0.1-alpha.1", "1.0.1-beta.1") // .orderedAscending
compareVersions("1.0.1-beta.1", "1.0.1-alpha.1") // .orderedDescending
compareVersions("1.0.1-alpha.1", "1.0.1-alpha.2") // .orderedAscending
compareVersions("1.0.1-alpha.2", "1.0.1-alpha.1") // .orderedDescending
compareVersions("1.0.1-beta.1", "1.0.1-beta.2") // .orderedAscending
compareVersions("1.0.1-beta.2", "1.0.1-beta.1") // .orderedDescending
``` // XCTAssertTrue failedenum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
let lhsComponents = lhs.components(separatedBy: ".")
let rhsComponents = rhs.components(separatedBy: ".")
var lhsIndex = 0
var rhsIndex = 0
while lhsIndex < lhsComponents.count && rhsIndex < rhsComponents.count {
let lhsComponent = lhsComponents[lhsIndex]
let rhsComponent = rhsComponents[rhsIndex]
if lhsComponent != rhsComponent {
if lhsComponent.hasPrefix("alpha") && rhsComponent.hasPrefix("beta") {
return .orderedAscending
} else if lhsComponent.hasPrefix("beta") && rhsComponent.hasPrefix("alpha") {
return .orderedDescending
} else if lhsComponent.hasPrefix("alpha") {
return .orderedDescending
} else if rhsComponent.hasPrefix("alpha") {
return .orderedAscending
} else if lhsComponent.hasPrefix("beta") {
return .orderedDescending
} else if rhsComponent.hasPrefix("beta") {
return .orderedAscending
} else {
let lhsNumber = Int(lhsComponent) ?? 0
let rhsNumber = Int(rhsComponent) ?? 0
if lhsNumber < rhsNumber {
return .orderedAscending
} else if lhsNumber > rhsNumber {
return .orderedDescending
}
}
}
lhsIndex += 1
rhsIndex += 1
}
if lhsIndex < lhsComponents.count {
return .orderedDescending
} else if rhsIndex < rhsComponents.count {
return .orderedAscending
}
return .orderedSame
}```swift
enum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
let lhsComponents = lhs.components(separatedBy: ".")
let rhsComponents = rhs.components(separatedBy: ".")
var lhsIndex = 0
var rhsIndex = 0
while lhsIndex < lhsComponents.count && rhsIndex < rhsComponents.count {
let lhsComponent = lhsComponents[lhsIndex]
let rhsComponent = rhsComponents[rhsIndex]
if lhsComponent != rhsComponent {
if lhsComponent.hasPrefix("alpha") && rhsComponent.hasPrefix("beta") {
return .orderedAscending
} else if lhsComponent.hasPrefix("beta") && rhsComponent.hasPrefix("alpha") {
return .orderedDescending
} else if lhsComponent.hasPrefix("alpha") {
return .orderedDescending
} else if rhsComponent.hasPrefix("alpha") {
return .orderedAscending
} else if lhsComponent.hasPrefix("beta") {
return .orderedDescending
} else if rhsComponent.hasPrefix("beta") {
return .orderedAscending
} else {
let lhsNumber = Int(lhsComponent) ?? 0
let rhsNumber = Int(rhsComponent) ?? 0
if lhsNumber < rhsNumber {
return .orderedAscending
} else if lhsNumber > rhsNumber {
return .orderedDescending
}
}
}
lhsIndex += 1
rhsIndex += 1
}
if lhsIndex < lhsComponents.count {
return .orderedDescending
} else if rhsIndex < rhsComponents.count {
return .orderedAscending
}
return .orderedSame
}
// Tests
compareVersions("1.0.0", "1.0.0") // .orderedSame
compareVersions("1.0.0", "1.0.1") // .orderedAscending
compareVersions("1.0.1", "1.0.0") // .orderedDescending
compareVersions("1.0.0-alpha.1", "1.0.0-alpha.2") // .orderedAscending
compareVersions("1.0.0-alpha.2", "1.0.0-alpha.1") // .orderedDescending
compareVersions("1.0.0-beta.1", "1.0.0-alpha.2") // .orderedAscending
compareVersions("1.0.0-alpha.2", "1.0.0-beta.1") // .orderedDescending
compareVersions("1.0.0-beta.1", "1.0.0-beta.2") // .orderedAscending
compareVersions("1.0.0-beta.2", "1.0.0-beta.1") // .orderedDescending
``` // XCTAssertTrue failedenum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
let lhsComponents = lhs.components(separatedBy: ".")
let rhsComponents = rhs.components(separatedBy: ".")
for (lhsComponent, rhsComponent) in zip(lhsComponents, rhsComponents) {
let lhsNumber = Int(lhsComponent)
let rhsNumber = Int(rhsComponent)
if lhsNumber == rhsNumber {
continue
} else if lhsNumber == nil {
return .orderedAscending
} else if rhsNumber == nil {
return .orderedDescending
} else {
return lhsNumber! < rhsNumber! ? .orderedAscending : .orderedDescending
}
}
return lhsComponents.count == rhsComponents.count ? .orderedSame : lhsComponents.count < rhsComponents.count ? .orderedAscending : .orderedDescending
}```swift
enum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
let lhsComponents = lhs.components(separatedBy: ".")
let rhsComponents = rhs.components(separatedBy: ".")
for (lhsComponent, rhsComponent) in zip(lhsComponents, rhsComponents) {
let lhsNumber = Int(lhsComponent)
let rhsNumber = Int(rhsComponent)
if lhsNumber == rhsNumber {
continue
} else if lhsNumber == nil {
return .orderedAscending
} else if rhsNumber == nil {
return .orderedDescending
} else {
return lhsNumber! < rhsNumber! ? .orderedAscending : .orderedDescending
}
}
return lhsComponents.count == rhsComponents.count ? .orderedSame : lhsComponents.count < rhsComponents.count ? .orderedAscending : .orderedDescending
}
compareVersions("1.0.0", "1.0.0") // .orderedSame
compareVersions("1.0.0", "1.0.0-alpha") // .orderedAscending
compareVersions("1.0.0-alpha", "1.0.0") // .orderedDescending
compareVersions("1.0.0-alpha", "1.0.0-beta") // .orderedAscending
compareVersions("1.0.0-beta", "1.0.0-alpha") // .orderedDescending
compareVersions("1.0.0-alpha", "1.0.0-alpha.1") // .orderedAscending
compareVersions("1.0.0-alpha.1", "1.0.0-alpha") // .orderedDescending
compareVersions("1.0.0-alpha.1", "1.0.0-alpha.2") // .orderedAscending
compareVersions("1.0.0-alpha.2", "1.0.0-alpha.1") // .orderedDescending
compareVersions("1.0.0-alpha.1", "1.0.0-beta.2") // .orderedAscending
compareVersions("1.0.0-beta.2", "1.0.0-alpha.1") // .orderedDescending
compareVersions("1.0.0-beta.2", "1.0.0-beta.1") // .orderedAscending
compareVersions("1.0.0-beta.1", "1.0.0-beta.2") // .orderedDescending
compareVersions("1.0.0-beta.2", "1.0.0-rc.1") // .orderedAscending
compareVersions("1.0.0-rc.1", "1.0.0-beta.2") // .orderedDescending
compareVersions("1.0.0-rc.1", "1.0.0-rc.2") // .orderedAscending
compareVersions("1.0.0-rc.2", "1.0.0-rc.1") // .orderedDescending
compareVersions("1.0.0-rc.1", "1.0.0") // .orderedAscending
compareVersions("1.0.0", "1.0.0-rc.1") // .orderedDescending
compareVersions("1.0.0-rc.1", "1.0.0-rc.1") // .orderedSame
compareVersions("1.0.0-rc.1", "1.0.0-rc.1-alpha") // .orderedAscending
compareVersions("1.0.0-rc.1-alpha", "1.0.0-rc.1") // .orderedDescending
compareVersions("1.0.0-rc.1-alpha", "1.0.0-rc.1-alpha.1") // .orderedAscending
compareVersions("1.0.0-rc.1-alpha.1", "1.0.0-rc.1-alpha") // .orderedDescending
compareVersions("1.0.0-rc.1-alpha.1", "1.0.0-rc.1-beta") // .orderedAscending
compareVersions("1.0.0-rc.1-beta // XCTAssertTrue failedenum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
// Split version strings into components.
let lhsComponents = lhs.components(separatedBy: ".")
let rhsComponents = rhs.components(separatedBy: ".")
// Iterate over components and compare them.
for (lhsComponent, rhsComponent) in zip(lhsComponents, rhsComponents) {
// If components are not equal, return their comparison result.
if lhsComponent != rhsComponent {
return lhsComponent < rhsComponent ? .orderedAscending : .orderedDescending
}
}
// If all components are equal, return their comparison result.
return lhsComponents.count == rhsComponents.count ? .orderedSame : lhsComponents.count > rhsComponents.count ? .orderedDescending : .orderedAscending
}```swift
enum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
// Split version strings into components.
let lhsComponents = lhs.components(separatedBy: ".")
let rhsComponents = rhs.components(separatedBy: ".")
// Iterate over components and compare them.
for (lhsComponent, rhsComponent) in zip(lhsComponents, rhsComponents) {
// If components are not equal, return their comparison result.
if lhsComponent != rhsComponent {
return lhsComponent < rhsComponent ? .orderedAscending : .orderedDescending
}
}
// If all components are equal, return their comparison result.
return lhsComponents.count == rhsComponents.count ? .orderedSame : lhsComponents.count > rhsComponents.count ? .orderedDescending : .orderedAscending
}
// Tests.
compareVersions("1.0.0", "1.0.0") // .orderedSame
compareVersions("1.0.0", "1.0.1") // .orderedAscending
compareVersions("1.0.1", "1.0.0") // .orderedDescending
compareVersions("1.0.0-alpha", "1.0.0-beta") // .orderedAscending
compareVersions("1.0.0-beta", "1.0.0-alpha") // .orderedDescending
compareVersions("1.0.0-alpha", "1.0.0-alpha") // .orderedSame
compareVersions("1.0.0-alpha", "1.0.0-alpha.1") // .orderedAscending
compareVersions("1.0.0-alpha.1", "1.0.0-alpha") // .orderedDescending
compareVersions("1.0.0-alpha.1", "1.0.0-alpha.2") // .orderedAscending
compareVersions("1.0.0-alpha.2", "1.0.0-alpha.1") // .orderedDescending
compareVersions("1.0.0-alpha.1", "1.0.0-beta") // .orderedAscending
compareVersions("1.0.0-beta", "1.0.0-alpha.1") // .orderedDescending
compareVersions("1.0.0-beta.1", "1.0.0-beta") // .orderedAscending
compareVersions("1.0.0-beta", "1.0.0-beta.1") // .orderedDescending
compareVersions("1.0.0-beta.2", "1.0.0-beta.1") // .orderedAscending
compareVersions("1.0.0-beta.1", "1.0.0-beta.2") // .orderedDescending
compareVersions("1.0.0-beta.1", "1.0.0-rc.1") // .orderedAscending
compareVersions("1.0.0-rc.1", "1.0.0-beta.1") // .orderedDescending
compareVersions("1.0.0-rc.1", "1.0.0-rc.2") // .orderedAscending
compareVersions("1.0.0-rc.2", "1.0.0-rc.1") // .orderedDescending
compareVersions("1.0.0-rc.1", "1.0.0") // .orderedAscending
compareVersions("1.0.0", "1.0.0-rc.1") // .orderedDescending
compareVersions("1.0.0-rc.1", "1.0.0-rc.1") // .orderedSame
compareVersions("1.0.0-rc.1", "1.0.0-rc.1.1") // .orderedAscending
compareVersions("1.0.0-rc.1.1", "1.0.0-rc.1") // .orderedDescending
compareVersions("1.0.0-rc.1.1", "1.0.0-rc.1.2") // .orderedAscending
compareVersions("1.0.0-rc.1.2", "1.0.0-rc.1.1") // .orderedDesc // XCTAssertTrue failedenum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
// Split version strings into components.
let lhsComponents = lhs.components(separatedBy: ".")
let rhsComponents = rhs.components(separatedBy: ".")
// Iterate over components and compare them.
for (lhsComponent, rhsComponent) in zip(lhsComponents, rhsComponents) {
// If components are not equal, return comparison result.
if lhsComponent != rhsComponent {
return lhsComponent < rhsComponent ? .orderedAscending : .orderedDescending
}
}
// If all components are equal, return ordering of remaining components.
if lhsComponents.count == rhsComponents.count {
return .orderedSame
} else {
return lhsComponents.count < rhsComponents.count ? .orderedAscending : .orderedDescending
}
}```swift
enum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
// Split version strings into components.
let lhsComponents = lhs.components(separatedBy: ".")
let rhsComponents = rhs.components(separatedBy: ".")
// Iterate over components and compare them.
for (lhsComponent, rhsComponent) in zip(lhsComponents, rhsComponents) {
// If components are not equal, return comparison result.
if lhsComponent != rhsComponent {
return lhsComponent < rhsComponent ? .orderedAscending : .orderedDescending
}
}
// If all components are equal, return ordering of remaining components.
if lhsComponents.count == rhsComponents.count {
return .orderedSame
} else {
return lhsComponents.count < rhsComponents.count ? .orderedAscending : .orderedDescending
}
}
// Tests.
assert(compareVersions("1.0.0", "1.0.0") == .orderedSame)
assert(compareVersions("1.0.0", "1.0.0-alpha") == .orderedAscending)
assert(compareVersions("1.0.0-alpha", "1.0.0") == .orderedDescending)
assert(compareVersions("1.0.0-alpha", "1.0.0-alpha") == .orderedSame)
assert(compareVersions("1.0.0-alpha", "1.0.0-beta") == .orderedAscending)
assert(compareVersions("1.0.0-beta", "1.0.0-alpha") == .orderedDescending)
assert(compareVersions("1.0.0-beta", "1.0.0-beta") == .orderedSame)
assert(compareVersions("1.0.0-beta.1", "1.0.0-beta") == .orderedAscending)
assert(compareVersions("1.0.0-beta", "1.0.0-beta.1") == .orderedDescending)
assert(compareVersions("1.0.0-beta.2", "1.0.0-beta.1") == .orderedAscending)
assert(compareVersions("1.0.0-beta.1", "1.0.0-beta.2") == .orderedDescending)
``` // XCTAssertTrue failedenum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
let lhsComponents = lhs.components(separatedBy: ".")
let rhsComponents = rhs.components(separatedBy: ".")
for (lhsComponent, rhsComponent) in zip(lhsComponents, rhsComponents) {
let lhsVersion = Int(lhsComponent) ?? 0
let rhsVersion = Int(rhsComponent) ?? 0
if lhsVersion < rhsVersion {
return .orderedAscending
} else if lhsVersion > rhsVersion {
return .orderedDescending
}
}
if lhsComponents.count < rhsComponents.count {
return .orderedAscending
} else if lhsComponents.count > rhsComponents.count {
return .orderedDescending
}
return .orderedSame
}```swift
enum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
let lhsComponents = lhs.components(separatedBy: ".")
let rhsComponents = rhs.components(separatedBy: ".")
for (lhsComponent, rhsComponent) in zip(lhsComponents, rhsComponents) {
let lhsVersion = Int(lhsComponent) ?? 0
let rhsVersion = Int(rhsComponent) ?? 0
if lhsVersion < rhsVersion {
return .orderedAscending
} else if lhsVersion > rhsVersion {
return .orderedDescending
}
}
if lhsComponents.count < rhsComponents.count {
return .orderedAscending
} else if lhsComponents.count > rhsComponents.count {
return .orderedDescending
}
return .orderedSame
}
// Tests
compareVersions("1.0.0", "1.0.0") // .orderedSame
compareVersions("1.0.0", "1.0.1") // .orderedAscending
compareVersions("1.0.1", "1.0.0") // .orderedDescending
compareVersions("1.0.0-alpha", "1.0.0-beta") // .orderedAscending
compareVersions("1.0.0-beta", "1.0.0-alpha") // .orderedDescending
compareVersions("1.0.0-alpha", "1.0.0-alpha") // .orderedSame
compareVersions("1.0.0-alpha", "1.0.0-beta") // .orderedAscending
compareVersions("1.0.0-beta", "1.0.0-alpha") // .orderedDescending
compareVersions("1.0.0-alpha.1", "1.0.0-alpha") // .orderedAscending
compareVersions("1.0.0-alpha", "1.0.0-alpha.1") // .orderedDescending
compareVersions("1.0.0-alpha.1", "1.0.0-alpha.2") // .orderedAscending
compareVersions("1.0.0-alpha.2", "1.0.0-alpha.1") // .orderedDescending
compareVersions("1.0.0-alpha.1", "1.0.0-beta") // .orderedAscending
compareVersions("1.0.0-beta", "1.0.0-alpha.1") // .orderedDescending
compareVersions("1.0.0-beta.2", "1.0.0-beta.1") // .orderedAscending
compareVersions("1.0.0-beta.1", "1.0.0-beta.2") // .orderedDescending
compareVersions("1.0.0-beta.11", "1.0.0-beta.2") // .orderedAscending
compareVersions("1.0.0-beta.2", "1.0.0-beta.11") // .orderedDescending
compareVersions("1.0.0-beta.14", "1.0.0-beta.2") // .orderedAscending
compareVersions("1.0.0-beta.2", "1.0.0-beta.14") // .orderedDescending
compareVersions("1.0.0-beta.14.1", "1.0.0-beta.2") // .orderedAscending
compareVersions("1.0.0-beta.2", "1.0.0-beta.14.1") // .orderedDescending
compareVersions("1.0.0-beta.14.1", "1.0.0-beta.14") // .orderedAscending
compareVersions("1.0.0-beta.14", "1.0.0-beta.14.1") // .orderedDescending
compareVersions("1.0.0-beta.14.1", "1.0.0-beta.15") // .orderedAscending
compareVersions("1.0.0-beta.15", "1.0.0-beta.14.1") // .orderedDescending
compareVersions // XCTAssertTrue failedenum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
let lhsComponents = lhs.components(separatedBy: ".")
let rhsComponents = rhs.components(separatedBy: ".")
let lhsCount = lhsComponents.count
let rhsCount = rhsComponents.count
let count = max(lhsCount, rhsCount)
for i in 0..<count {
let lhsComponent = i < lhsCount ? lhsComponents[i] : "0"
let rhsComponent = i < rhsCount ? rhsComponents[i] : "0"
if lhsComponent != rhsComponent {
if lhsComponent.hasPrefix("alpha") && rhsComponent.hasPrefix("beta") {
return .orderedAscending
} else if lhsComponent.hasPrefix("beta") && rhsComponent.hasPrefix("alpha") {
return .orderedDescending
} else if lhsComponent.hasPrefix("alpha") {
return .orderedDescending
} else if rhsComponent.hasPrefix("alpha") {
return .orderedAscending
} else if lhsComponent.hasPrefix("beta") {
return .orderedDescending
} else if rhsComponent.hasPrefix("beta") {
return .orderedAscending
} else {
let lhsNumber = Int(lhsComponent) ?? 0
let rhsNumber = Int(rhsComponent) ?? 0
if lhsNumber < rhsNumber {
return .orderedAscending
} else if lhsNumber > rhsNumber {
return .orderedDescending
}
}
}
}
return .orderedSame
}```swift
enum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
let lhsComponents = lhs.components(separatedBy: ".")
let rhsComponents = rhs.components(separatedBy: ".")
let lhsCount = lhsComponents.count
let rhsCount = rhsComponents.count
let count = max(lhsCount, rhsCount)
for i in 0..<count {
let lhsComponent = i < lhsCount ? lhsComponents[i] : "0"
let rhsComponent = i < rhsCount ? rhsComponents[i] : "0"
if lhsComponent != rhsComponent {
if lhsComponent.hasPrefix("alpha") && rhsComponent.hasPrefix("beta") {
return .orderedAscending
} else if lhsComponent.hasPrefix("beta") && rhsComponent.hasPrefix("alpha") {
return .orderedDescending
} else if lhsComponent.hasPrefix("alpha") {
return .orderedDescending
} else if rhsComponent.hasPrefix("alpha") {
return .orderedAscending
} else if lhsComponent.hasPrefix("beta") {
return .orderedDescending
} else if rhsComponent.hasPrefix("beta") {
return .orderedAscending
} else {
let lhsNumber = Int(lhsComponent) ?? 0
let rhsNumber = Int(rhsComponent) ?? 0
if lhsNumber < rhsNumber {
return .orderedAscending
} else if lhsNumber > rhsNumber {
return .orderedDescending
}
}
}
}
return .orderedSame
}
// Tests
compareVersions("1.0.0", "1.0.0") // .orderedSame
compareVersions("1.0.0", "1.0.1") // .orderedAscending
compareVersions("1.0.1", "1.0.0") // .orderedDescending
compareVersions("1.0.1", "1.0.2") // .orderedAscending
compareVersions("1.0.2", "1.0.1") // .orderedDescending
compareVersions("1.0.1-alpha.1", "1.0.1") // .orderedAscending
compareVersions("1.0.1", "1.0.1-alpha.1") // .orderedDescending
compareVersions("1.0.1-alpha.1", "1.0.1-alpha.2") // .orderedAscending
compareVersions("1.0.1-alpha.2", "1.0.1-alpha.1") // .orderedDescending
compareVersions("1.0.1-beta.1", "1.0.1-alpha.2") // .orderedAscending
compareVersions("1.0.1-alpha.2", "1.0.1-beta.1") // .orderedDescending
compareVersions("1.0.1-beta.1", "1.0.1-beta.2") // .orderedAscending
compareVersions("1.0.1-beta.2", "1.0.1-beta.1") // .orderedDescending
``` // XCTAssertTrue failedenum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
let lhsComponents = lhs.components(separatedBy: ".")
let rhsComponents = rhs.components(separatedBy: ".")
for (lhsComponent, rhsComponent) in zip(lhsComponents, rhsComponents) {
if lhsComponent != rhsComponent {
return lhsComponent < rhsComponent ? .orderedAscending : .orderedDescending
}
}
return lhsComponents.count == rhsComponents.count ? .orderedSame : lhsComponents.count < rhsComponents.count ? .orderedAscending : .orderedDescending
}```swift
enum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
let lhsComponents = lhs.components(separatedBy: ".")
let rhsComponents = rhs.components(separatedBy: ".")
for (lhsComponent, rhsComponent) in zip(lhsComponents, rhsComponents) {
if lhsComponent != rhsComponent {
return lhsComponent < rhsComponent ? .orderedAscending : .orderedDescending
}
}
return lhsComponents.count == rhsComponents.count ? .orderedSame : lhsComponents.count < rhsComponents.count ? .orderedAscending : .orderedDescending
}
// Tests
compareVersions("1.0.0", "1.0.0") // .orderedSame
compareVersions("1.0.0", "1.0.1") // .orderedAscending
compareVersions("1.0.1", "1.0.0") // .orderedDescending
compareVersions("1.0.0", "1.0.0-alpha") // .orderedSame
compareVersions("1.0.0-alpha", "1.0.0") // .orderedSame
compareVersions("1.0.0-alpha", "1.0.0-beta") // .orderedAscending
compareVersions("1.0.0-beta", "1.0.0-alpha") // .orderedDescending
compareVersions("1.0.0-alpha", "1.0.0-alpha.1") // .orderedAscending
compareVersions("1.0.0-alpha.1", "1.0.0-alpha") // .orderedDescending
compareVersions("1.0.0-alpha.1", "1.0.0-alpha.2") // .orderedAscending
compareVersions("1.0.0-alpha.2", "1.0.0-alpha.1") // .orderedDescending
compareVersions("1.0.0-alpha.1", "1.0.0-beta") // .orderedAscending
compareVersions("1.0.0-beta", "1.0.0-alpha.1") // .orderedDescending
compareVersions("1.0.0-beta.2", "1.0.0-beta.1") // .orderedAscending
compareVersions("1.0.0-beta.1", "1.0.0-beta.2") // .orderedDescending
compareVersions("1.0.0-beta.11", "1.0.0-beta.2") // .orderedAscending
compareVersions("1.0.0-beta.2", "1.0.0-beta.11") // .orderedDescending
compareVersions("1.0.0-beta.14", "1.0.0-beta.2") // .orderedAscending
compareVersions("1.0.0-beta.2", "1.0.0-beta.14") // .orderedDescending
compareVersions("1.0.0-beta.14.1", "1.0.0-beta.2") // .orderedAscending
compareVersions("1.0.0-beta.2", "1.0.0-beta.14.1") // .orderedDescending
compareVersions("1.0.0-rc.1", "1.0.0-beta.14") // .orderedAscending
compareVersions("1.0.0-beta.14", "1.0.0-rc.1") // .orderedDescending
compareVersions("1.0.0-rc.1+build.1", "1.0.0-rc.1") // .orderedSame
compareVersions("1.0.0-rc.1", "1.0.0-rc.1+build.1") // .orderedSame
compareVersions("1.0.0-rc.1+build.1", "1.0.0-rc.1+build.2") // .orderedAscending
compareVersions("1.0.0-rc.1+build.2", "1.0.0-rc.1+build.1") // .orderedDescending
compareVersions("1.0.0-rc.1+build.123", " // XCTAssertTrue failed