Metadata
| Key | Value |
|---|---|
| engine | modal |
| 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 {
guard let data = string.data(using:.utf8) else {
throw ParsingError.invalidInput
}
do {
let json = try JSONSerialization.jsonObject(with: data)
return json as! JSON
} catch {
throw ParsingError.internalError(error)
}
}
func parse(string: String) throws -> JSON {
guard let data = string.data(using:.utf8) else {
throw NSError(domain: "ParsingError", code: 1, userInfo: nil)
}
do {
let json = try JSONSerialization.jsonObject(with: data)
return json as! JSON
} catch {
throw 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 {
let json = try JSONSerialization.jsonObject(with: data)
return json as! JSON
} catch {
throw ParsingError.internalError(error)
}
}
// JSON parser, returns NSError in case of failures.
func parse(string: String) throws -> JSON {
guard let data = string.data(using:.utf8) else {
throw NSError(domain: "ParsingError", code: 1, userInfo: nil)
}
do {
let json = try JSONSerialization.jsonObject(with: data)
return json as! JSON
} catch {
throw error
}
}
```func parse(string: String) throws -> JSON { // invalid redeclaration of 'parse(string:)'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 {
let json = try JSONSerialization.jsonObject(with: data, options: []) as! JSON
return json
} catch {
throw ParsingError.internalError(error)
}
}
func parse(string: String) throws -> JSON {
guard let data = string.data(using:.utf8) else {
throw NSError(domain: "ParsingError", code: 0, userInfo: nil)
}
do {
let json = try JSONSerialization.jsonObject(with: data, options: []) as! JSON
return json
} catch {
throw 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 {
let json = try JSONSerialization.jsonObject(with: data, options: []) as! JSON
return json
} catch {
throw ParsingError.internalError(error)
}
}
// JSON parser, returns NSError in case of failures.
func parse(string: String) throws -> JSON {
guard let data = string.data(using:.utf8) else {
throw NSError(domain: "ParsingError", code: 0, userInfo: nil)
}
do {
let json = try JSONSerialization.jsonObject(with: data, options: []) as! JSON
return json
} catch {
throw error
}
}
```func parse(string: String) throws -> JSON { // invalid redeclaration of 'parse(string:)'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 {
let json = try JSONSerialization.jsonObject(with: data, options: []) as! JSON
return json
} catch {
throw ParsingError.internalError(error)
}
}
func parse(string: String) throws -> JSON {
guard let data = string.data(using:.utf8) else {
throw NSError(domain: "com.example.parsing", code: 1, userInfo: nil)
}
do {
let json = try JSONSerialization.jsonObject(with: data, options: []) as! JSON
return json
} catch {
throw 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 {
let json = try JSONSerialization.jsonObject(with: data, options: []) as! JSON
return json
} catch {
throw ParsingError.internalError(error)
}
}
// JSON parser, returns NSError in case of failures.
func parse(string: String) throws -> JSON {
guard let data = string.data(using:.utf8) else {
throw NSError(domain: "com.example.parsing", code: 1, userInfo: nil)
}
do {
let json = try JSONSerialization.jsonObject(with: data, options: []) as! JSON
return json
} catch {
throw error
}
}
```func parse(string: String) throws -> JSON { // invalid redeclaration of 'parse(string:)'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 {
let json = try JSONSerialization.jsonObject(with: data, options: []) as? JSON
return json?? [:]
} catch {
throw ParsingError.internalError(error)
}
}
func parse(string: String) throws -> JSON {
guard let data = string.data(using:.utf8) else {
throw NSError(domain: "ParsingError", code: 0, userInfo: nil)
}
do {
let json = try JSONSerialization.jsonObject(with: data, options: []) as? JSON
return json?? [:]
} catch {
throw 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 {
let json = try JSONSerialization.jsonObject(with: data, options: []) as? JSON
return json?? [:]
} catch {
throw ParsingError.internalError(error)
}
}
// JSON parser, returns NSError in case of failures.
func parse(string: String) throws -> JSON {
guard let data = string.data(using:.utf8) else {
throw NSError(domain: "ParsingError", code: 0, userInfo: nil)
}
do {
let json = try JSONSerialization.jsonObject(with: data, options: []) as? JSON
return json?? [:]
} catch {
throw error
}
}
```return json?? [:] // cannot convert return expression of type 'Any?' to return type 'JSON' (aka 'Dictionary<String, Any>')return json?? [:] // missing argument for parameter #1 in subscriptreturn json?? [:] // expected expression in list of expressionsreturn json?? [:] // cannot use optional chaining on non-optional value of type 'JSON' (aka 'Dictionary<String, Any>')func parse(string: String) throws -> JSON { // invalid redeclaration of 'parse(string:)'return json?? [:] // cannot convert return expression of type 'Any?' to return type 'JSON' (aka 'Dictionary<String, Any>')return json?? [:] // expected expression in list of expressionsreturn json?? [:] // missing argument for parameter #1 in subscriptreturn json?? [:] // cannot use optional chaining on non-optional value of type 'JSON' (aka 'Dictionary<String, Any>')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 {
let json = try JSONSerialization.jsonObject(with: data, options: []) as! JSON
return json
} catch {
throw ParsingError.internalError(error)
}
}
func parse(string: String) throws -> JSON {
guard let data = string.data(using:.utf8) else {
throw NSError(domain: "ParsingError", code: 0, userInfo: nil)
}
do {
let json = try JSONSerialization.jsonObject(with: data, options: []) as! JSON
return json
} catch {
throw 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 {
let json = try JSONSerialization.jsonObject(with: data, options: []) as! JSON
return json
} catch {
throw ParsingError.internalError(error)
}
}
// JSON parser, returns NSError in case of failures.
func parse(string: String) throws -> JSON {
guard let data = string.data(using:.utf8) else {
throw NSError(domain: "ParsingError", code: 0, userInfo: nil)
}
do {
let json = try JSONSerialization.jsonObject(with: data, options: []) as! JSON
return json
} catch {
throw error
}
}
```func parse(string: String) throws -> JSON { // invalid redeclaration of 'parse(string:)'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 {
let json = try JSONSerialization.jsonObject(with: data)
guard let result = json as? JSON else {
throw ParsingError.internalError(ParsingError.invalidInput)
}
return result
} 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 {
let json = try JSONSerialization.jsonObject(with: data)
guard let result = json as? JSON else {
throw ParsingError.internalError(ParsingError.invalidInput)
}
return result
} 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 {
let json = try JSONSerialization.jsonObject(with: data, options: []) as! JSON
return json
} catch {
throw ParsingError.internalError(error)
}
}
func parse(string: String) throws -> JSON {
guard let data = string.data(using:.utf8) else {
throw NSError(domain: "ParsingError", code: 1, userInfo: nil)
}
do {
let json = try JSONSerialization.jsonObject(with: data, options: []) as! JSON
return json
} catch {
throw 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 {
let json = try JSONSerialization.jsonObject(with: data, options: []) as! JSON
return json
} catch {
throw ParsingError.internalError(error)
}
}
// JSON parser, returns NSError in case of failures.
func parse(string: String) throws -> JSON {
guard let data = string.data(using:.utf8) else {
throw NSError(domain: "ParsingError", code: 1, userInfo: nil)
}
do {
let json = try JSONSerialization.jsonObject(with: data, options: []) as! JSON
return json
} catch {
throw error
}
}
```func parse(string: String) throws -> JSON { // invalid redeclaration of 'parse(string:)'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 {
let json = try JSONSerialization.jsonObject(with: data, options: []) as! JSON
return json
} catch {
throw ParsingError.internalError(error)
}
}
func parse(string: String) -> (JSON?, Error?) {
guard let data = string.data(using:.utf8) else {
return (nil, ParsingError.invalidInput)
}
do {
let json = try JSONSerialization.jsonObject(with: data, options: []) as! JSON
return (json, nil)
} catch {
return (nil, 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 {
let json = try JSONSerialization.jsonObject(with: data, options: []) as! JSON
return json
} catch {
throw ParsingError.internalError(error)
}
}
// JSON parser, returns a tuple of (JSON, Error?)
func parse(string: String) -> (JSON?, Error?) {
guard let data = string.data(using:.utf8) else {
return (nil, ParsingError.invalidInput)
}
do {
let json = try JSONSerialization.jsonObject(with: data, options: []) as! JSON
return (json, nil)
} catch {
return (nil, ParsingError.internalError(error))
}
}
```let result = try parse(string: string) // ambiguous use of 'parse(string:)'_ = try parse(string: string) // ambiguous use of 'parse(string:)'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 {
let json = try JSONSerialization.jsonObject(with: data, options: []) as? JSON
return json?? [:]
} catch {
throw ParsingError.internalError(error)
}
}
func parse(string: String) throws -> JSON {
guard let data = string.data(using:.utf8) else {
throw NSError(domain: "ParsingError", code: 1, userInfo: nil)
}
do {
let json = try JSONSerialization.jsonObject(with: data, options: []) as? JSON
return json?? [:]
} catch {
throw 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 {
let json = try JSONSerialization.jsonObject(with: data, options: []) as? JSON
return json?? [:]
} catch {
throw ParsingError.internalError(error)
}
}
// JSON parser, returns NSError in case of failures.
func parse(string: String) throws -> JSON {
guard let data = string.data(using:.utf8) else {
throw NSError(domain: "ParsingError", code: 1, userInfo: nil)
}
do {
let json = try JSONSerialization.jsonObject(with: data, options: []) as? JSON
return json?? [:]
} catch {
throw error
}
}
```return json?? [:] // cannot use optional chaining on non-optional value of type 'JSON' (aka 'Dictionary<String, Any>')return json?? [:] // expected expression in list of expressionsreturn json?? [:] // missing argument for parameter #1 in subscriptreturn json?? [:] // cannot convert return expression of type 'Any?' to return type 'JSON' (aka 'Dictionary<String, Any>')func parse(string: String) throws -> JSON { // invalid redeclaration of 'parse(string:)'return json?? [:] // expected expression in list of expressionsreturn json?? [:] // cannot use optional chaining on non-optional value of type 'JSON' (aka 'Dictionary<String, Any>')return json?? [:] // missing argument for parameter #1 in subscriptreturn json?? [:] // cannot convert return expression of type 'Any?' to return type 'JSON' (aka 'Dictionary<String, Any>')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 {
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 {
guard let data = string.data(using:.utf8) else {
throw ParsingError.invalidInput
}
do {
let json = try JSONSerialization.jsonObject(with: data, options: []) as? JSON
return json?? [:]
} catch {
throw ParsingError.internalError(error)
}
}
```return json?? [:] // missing argument for parameter #1 in subscriptreturn json?? [:] // cannot use optional chaining on non-optional value of type 'JSON' (aka 'Dictionary<String, Any>')return json?? [:] // cannot convert return expression of type 'Any?' to return type 'JSON' (aka 'Dictionary<String, Any>')return json?? [:] // expected expression in list of expressionsindirect 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):
let attributesString = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(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):
let attributesString = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
// 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):
let attributesString = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
// 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):
let attributesString = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
// 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):
let attributesString = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
// 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):
let attributesString = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
// 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):
let attributesString = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
// 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):
let attributesString = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
// 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):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):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(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):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
// 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):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
let tree = HTMLNode.element("div", 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):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(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):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
let tree: HTMLNode =.element("div", 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):
let attributes = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let children = children.map(generate).joined(separator: "")
return "<\(name) \(attributes)>\(children)</\(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):
let attributes = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let children = children.map(generate).joined(separator: "")
return "<\(name) \(attributes)>\(children)</\(name)>"
}
}
let tree = HTMLNode.element("div", 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):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(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):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
let tree = HTMLNode.element("div", children: [
HTMLNode.element("a", attributes: ["href": "swifteval"], children: [
HTMLNode.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):
let attributesString = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(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):
let attributesString = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
// 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):
let attributesString = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
// 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):
let attributesString = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
// 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):
let attributesString = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
// 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):
let attributesString = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
// 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):
let attributesString = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
// 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):
let attributesString = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
// 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):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):
let attributesString = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(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):
let attributesString = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
// 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):
let attributesString = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
let tree = HTMLNode.element("div", children: [
HTMLNode.element("a", attributes: ["href": "swifteval"], children: [
HTMLNode.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
}
}
// 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
}
}
// 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
}
}
// 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
}
}
// 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
}
}
// 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
}
}
// 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
}
}
// 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):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):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let childrenString = children.map(generate).joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(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):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let childrenString = children.map(generate).joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
let tree = HTMLNode.element("div", children: [
HTMLNode.element("a", attributes: ["href": "swifteval"], children: [
HTMLNode.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):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(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):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
// 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):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
// 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):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
// 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):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
// 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):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
// 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):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
// 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):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree:enum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
let tokens = tokenize(string)
let postfix = try infixToPostfix(tokens)
return try evaluatePostfix(postfix)
}```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 = tokenize(string)
let postfix = try infixToPostfix(tokens)
return try evaluatePostfix(postfix)
}
```let tokens = tokenize(string) // cannot find 'tokenize' in scopelet postfix = try infixToPostfix(tokens) // cannot find 'infixToPostfix' in scopereturn try evaluatePostfix(postfix) // cannot find 'evaluatePostfix' in scopeenum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
let tokens = tokenize(string)
let expression = try parse(tokens)
return evaluate(expression)
}
func tokenize(_ string: String) -> [Token] {
//...
}
func parse(_ tokens: [Token]) throws -> Expression {
//...
}
func evaluate(_ expression: Expression) -> Double {
//...
}```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 = tokenize(string)
let expression = try parse(tokens)
return evaluate(expression)
}
// Tokenize the input string into an array of tokens.
func tokenize(_ string: String) -> [Token] {
//...
}
// Parse the tokens into an expression tree.
func parse(_ tokens: [Token]) throws -> Expression {
//...
}
// Evaluate the expression tree and return the result.
func evaluate(_ expression: Expression) -> Double {
//...
}
```func tokenize(_ string: String) -> [Token] { // cannot find type 'Token' in scopefunc parse(_ tokens: [Token]) throws -> Expression { // cannot find type 'Expression' in scopefunc parse(_ tokens: [Token]) throws -> Expression { // cannot find type 'Token' in scopefunc evaluate(_ expression: Expression) -> Double { // cannot find type 'Expression' in scopeenum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
let tokens = string.split(separator: " ").map(String.init)
var stack: [Double] = []
var operators: [String] = []
for token in tokens {
switch token {
case "+":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a + b)
case "-":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a - b)
case "*":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a * b)
case "/":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a / b)
case "(":
operators.append(String(token))
case ")":
while operators.last!= "(" {
try performOperation(stack: &stack, operators: &operators)
}
operators.removeLast()
default:
guard let value = Double(token) else { throw CalculateError.invalidInput }
stack.append(value)
}
}
while!operators.isEmpty {
try performOperation(stack: &stack, operators: &operators)
}
return stack.removeLast()
}
func performOperation(stack: inout [Double], operators: inout [String]) throws {
guard let operatorToken = operators.popLast() else { throw CalculateError.invalidInput }
switch operatorToken {
case "+":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a + b)
case "-":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a - b)
case "*":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a * b)
case "/":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(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 {
let tokens = string.split(separator: " ").map(String.init)
var stack: [Double] = []
var operators: [String] = []
for token in tokens {
switch token {
case "+":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a + b)
case "-":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a - b)
case "*":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a * b)
case "/":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a / b)
case "(":
operators.append(String(token))
case ")":
while operators.last!= "(" {
try performOperation(stack: &stack, operators: &operators)
}
operators.removeLast()
default:
guard let value = Double(token) else { throw CalculateError.invalidInput }
stack.append(value)
}
}
while!operators.isEmpty {
try performOperation(stack: &stack, operators: &operators)
}
return stack.removeLast()
}
func performOperation(stack: inout [Double], operators: inout [String]) throws {
guard let operatorToken = operators.popLast() else { throw CalculateError.invalidInput }
switch operatorToken {
case "+":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a + b)
case "-":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a - b)
case "*":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a * b)
case "/":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a / b)
default:
throw CalculateError.invalidInput
}
}
do {
let result = try calculate("2+2*2")
print(result)
} catch {
print(error)
}
```while operators.last!= "(" { // '=' must have consistent whitespace on both sideswhile operators.last!= "(" { // use of '=' in a boolean context, did you mean '=='?while operators.last!= "(" { // cannot assign through '!': 'last' is a get-only propertywhile!operators.isEmpty { // expected expression, var, or let in 'while' conditionenum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
let tokens = string.split(separator: " ").map(String.init)
var stack: [Double] = []
var operators: [String] = []
for token in tokens {
switch token {
case "+":
guard let rhs = stack.popLast(), let lhs = stack.popLast() else {
throw CalculateError.invalidInput
}
stack.append(lhs + rhs)
case "-":
guard let rhs = stack.popLast(), let lhs = stack.popLast() else {
throw CalculateError.invalidInput
}
stack.append(lhs - rhs)
case "*":
guard let rhs = stack.popLast(), let lhs = stack.popLast() else {
throw CalculateError.invalidInput
}
stack.append(lhs * rhs)
case "/":
guard let rhs = stack.popLast(), let lhs = stack.popLast() else {
throw CalculateError.invalidInput
}
stack.append(lhs / rhs)
case "(":
operators.append(String(token))
case ")":
while operators.last!= "(" {
guard let rhs = stack.popLast(), let lhs = stack.popLast() else {
throw CalculateError.invalidInput
}
let op = operators.popLast()!
switch op {
case "+":
stack.append(lhs + rhs)
case "-":
stack.append(lhs - rhs)
case "*":
stack.append(lhs * rhs)
case "/":
stack.append(lhs / rhs)
default:
throw CalculateError.invalidInput
}
}
operators.popLast()
default:
stack.append(Double(token)!)
}
}
while!operators.isEmpty {
guard let rhs = stack.popLast(), let lhs = stack.popLast() else {
throw CalculateError.invalidInput
}
let op = operators.popLast()!
switch op {
case "+":
stack.append(lhs + rhs)
case "-":
stack.append(lhs - rhs)
case "*":
stack.append(lhs * rhs)
case "/":
stack.append(lhs / rhs)
default:
throw CalculateError.invalidInput
}
}
return stack.popLast()!
}```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.split(separator: " ").map(String.init)
var stack: [Double] = []
var operators: [String] = []
for token in tokens {
switch token {
case "+":
guard let rhs = stack.popLast(), let lhs = stack.popLast() else {
throw CalculateError.invalidInput
}
stack.append(lhs + rhs)
case "-":
guard let rhs = stack.popLast(), let lhs = stack.popLast() else {
throw CalculateError.invalidInput
}
stack.append(lhs - rhs)
case "*":
guard let rhs = stack.popLast(), let lhs = stack.popLast() else {
throw CalculateError.invalidInput
}
stack.append(lhs * rhs)
case "/":
guard let rhs = stack.popLast(), let lhs = stack.popLast() else {
throw CalculateError.invalidInput
}
stack.append(lhs / rhs)
case "(":
operators.append(String(token))
case ")":
while operators.last!= "(" {
guard let rhs = stack.popLast(), let lhs = stack.popLast() else {
throw CalculateError.invalidInput
}
let op = operators.popLast()!
switch op {
case "+":
stack.append(lhs + rhs)
case "-":
stack.append(lhs - rhs)
case "*":
stack.append(lhs * rhs)
case "/":
stack.append(lhs / rhs)
default:
throw CalculateError.invalidInput
}
}
operators.popLast()
default:
stack.append(Double(token)!)
}
}
while!operators.isEmpty {
guard let rhs = stack.popLast(), let lhs = stack.popLast() else {
throw CalculateError.invalidInput
}
let op = operators.popLast()!
switch op {
case "+":
stack.append(lhs + rhs)
case "-":
stack.append(lhs - rhs)
case "*":
stack.append(lhs * rhs)
case "/":
stack.append(lhs / rhs)
default:
throw CalculateError.invalidInput
}
}
return stack.popLast()!
}
try calculate("2+2*2") // 6
try calculate("2+2*2+2") // 8
try calculate("2+2*2+2*2") // 10
try calculate("2+2*2+2*2+2") // 12
try calculate("2+2*2+2*2+2*2") // 14
try calculate("2+2*2+2*2+2*2+2") // 16
try calculate("2+2*2+2*2+2*2+2*2") // 18
try calculate("2+2*2+2*2+2*2+2*2+2") // 20
try calculate("2+2*2+2*2+2*2+2*2+2*2") // 22
try calculate("2+2*2+2*2+2*2+2*2+2*2+2") // 24
try calculate("2+2*2+2*2+2*2+2*2+2*2+2*2") // 26
try calculate("2+2*2+2*2+2*2+2*2+2*2+2*2+2") // 28
try calculate("2+2*2+2*2+2*2+2*2+2*2+2*2+2*2") // 30
try calculate("2+2*2+2*2+2*2+2*2+2*2+2*2+2*2+2") // 32
try calculate("2+2*2+2*2+2*2+2*2+2*2+2*2+2*2+2*2") // 34
try calculate("2+2*2+2*2+2*2+2*2+2*2+2*2+2*2+2*2+2") // 36
try calculate("2+2*2+2*2+2*2+2*2+2*2+2*2+2*2+2*2+2*2") // 38
try calculate("2+2*2+2*2+2*2while operators.last!= "(" { // cannot assign through '!': 'last' is a get-only propertywhile operators.last!= "(" { // use of '=' in a boolean context, did you mean '=='?while operators.last!= "(" { // '=' must have consistent whitespace on both sidesoperators.popLast() // result of call to 'popLast()' is unusedwhile!operators.isEmpty { // expected expression, var, or let in 'while' conditionenum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
let tokens = tokenize(string)
let expression = try parse(tokens)
return evaluate(expression)
}
func tokenize(_ string: String) -> [Token] {
var tokens: [Token] = []
var currentToken = ""
for char in string {
if let token = Token(rawValue: String(char)) {
if!currentToken.isEmpty {
tokens.append(.number(Double(currentToken)!))
currentToken = ""
}
tokens.append(token)
} else {
currentToken.append(char)
}
}
if!currentToken.isEmpty {
tokens.append(.number(Double(currentToken)!))
}
return tokens
}
func parse(_ tokens: [Token]) throws -> Expression {
var tokens = tokens
var expression = Expression()
while!tokens.isEmpty {
let token = tokens.removeFirst()
switch token {
case.number(let value):
expression.append(.number(value))
case.openParenthesis:
let subExpression = try parse(tokens)
expression.append(.subExpression(subExpression))
case.closeParenthesis:
return expression
case.plus:
expression.append(.plus)
case.minus:
expression.append(.minus)
case.multiply:
expression.append(.multiply)
case.divide:
expression.append(.divide)
}
}
return expression
}
func evaluate(_ expression: Expression) -> Double {
var expression = expression
var result: Double = 0
while!expression.isEmpty {
let token = expression.removeFirst()
switch token {
case.number(let value):
result = value
case.subExpression(let subExpression):
result = evaluate(subExpression)
case.plus:
result += expression.removeFirst().number
case.minus:
result -= expression.removeFirst().number
case.multiply:
result *= expression.removeFirst().number
case.divide:
result /= expression.removeFirst().number
}
}
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 = tokenize(string)
let expression = try parse(tokens)
return evaluate(expression)
}
// Tokenize string into array of tokens.
func tokenize(_ string: String) -> [Token] {
var tokens: [Token] = []
var currentToken = ""
for char in string {
if let token = Token(rawValue: String(char)) {
if!currentToken.isEmpty {
tokens.append(.number(Double(currentToken)!))
currentToken = ""
}
tokens.append(token)
} else {
currentToken.append(char)
}
}
if!currentToken.isEmpty {
tokens.append(.number(Double(currentToken)!))
}
return tokens
}
// Parse array of tokens into expression.
func parse(_ tokens: [Token]) throws -> Expression {
var tokens = tokens
var expression = Expression()
while!tokens.isEmpty {
let token = tokens.removeFirst()
switch token {
case.number(let value):
expression.append(.number(value))
case.openParenthesis:
let subExpression = try parse(tokens)
expression.append(.subExpression(subExpression))
case.closeParenthesis:
return expression
case.plus:
expression.append(.plus)
case.minus:
expression.append(.minus)
case.multiply:
expression.append(.multiply)
case.divide:
expression.append(.divide)
}
}
return expression
}
// Evaluate expression.
func evaluate(_ expression: Expression) -> Double {
var expression = expression
var result: Double = 0
while!expression.isEmpty {
let token = expression.removeFirst()
switch token {
case.number(let value):
result = value
case.subExpression(let subExpression):
result = evaluate(subExpression)
case.plus:
result += expression.removeFirst().number
case.minus:
result -= expression.removeFirst().number
case.multiply:
result *= expression.removeFirst().number
case.divide:
result /= expression.removeFirst().number
}
}
return result
}
// Example usage.
do {
let result = try calculate("2+2*2")
print(result)
} catch {
print(error)
}
```func tokenize(_ string: String) -> [Token] { // cannot find type 'Token' in scopevar tokens: [Token] = [] // cannot find type 'Token' in scopeif let token = Token(rawValue: String(char)) { // cannot find 'Token' in scopeif!currentToken.isEmpty { // expected expression, var, or let in 'if' conditionif!currentToken.isEmpty { // expected expression, var, or let in 'if' conditionfunc parse(_ tokens: [Token]) throws -> Expression { // cannot find type 'Expression' in scopefunc parse(_ tokens: [Token]) throws -> Expression { // cannot find type 'Token' in scopevar expression = Expression() // cannot find 'Expression' in scopewhile!tokens.isEmpty { // expected expression, var, or let in 'while' conditionfunc evaluate(_ expression: Expression) -> Double { // cannot find type 'Expression' in scopewhile!expression.isEmpty { // expected expression, var, or let in 'while' conditionenum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
let tokens = string.split(separator: " ").map(String.init)
var stack = [Double]()
var operators = [Character]()
for token in tokens {
if let number = Double(token) {
stack.append(number)
} else if let op = token.first {
while!operators.isEmpty && precedence(op) <= precedence(operators.last!) {
try apply(stack: &stack, operators: &operators)
}
operators.append(op)
} else {
throw CalculateError.invalidInput
}
}
while!operators.isEmpty {
try apply(stack: &stack, operators: &operators)
}
return stack.first!
}
func precedence(_ op: Character) -> Int {
switch op {
case "+": return 1
case "-": return 1
case "*": return 2
case "/": return 2
default: return 0
}
}
func apply(stack: inout [Double], operators: inout [Character]) throws {
guard let op = operators.popLast() else { return }
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let right = stack.popLast()!
let left = stack.popLast()!
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
}
}```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.split(separator: " ").map(String.init)
var stack = [Double]()
var operators = [Character]()
for token in tokens {
if let number = Double(token) {
stack.append(number)
} else if let op = token.first {
while!operators.isEmpty && precedence(op) <= precedence(operators.last!) {
try apply(stack: &stack, operators: &operators)
}
operators.append(op)
} else {
throw CalculateError.invalidInput
}
}
while!operators.isEmpty {
try apply(stack: &stack, operators: &operators)
}
return stack.first!
}
func precedence(_ op: Character) -> Int {
switch op {
case "+": return 1
case "-": return 1
case "*": return 2
case "/": return 2
default: return 0
}
}
func apply(stack: inout [Double], operators: inout [Character]) throws {
guard let op = operators.popLast() else { return }
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let right = stack.popLast()!
let left = stack.popLast()!
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
}
}
try calculate("2+2*2") // 6
try calculate("2+2*2+2") // 8
try calculate("2+2*2+2*2") // 10
try calculate("2+2*2+2*2+2") // 12
try calculate("2+2*2+2*2+2*2") // 14
try calculate("2+2*2+2*2+2*2+2") // 16
try calculate("2+2*2+2*2+2*2+2*2") // 18
try calculate("2+2*2+2*2+2*2+2*2+2") // 20
try calculate("2+2*2+2*2+2*2+2*2+2*2") // 22
try calculate("2+2*2+2*2+2*2+2*2+2*2+2") // 24
try calculate("2+2*2+2*2+2*2+2*2+2*2+2*2") // 26
try calculate("2+2*2+2*2+2*2+2*2+2*2+2*2+2") // 28
try calculate("2+2*2+2*2+2*2+2*2+2*2+2*2+2*2") // 30
try calculate("2+2*2+2*2+2*2+2*2+2*2+2*2+2*2+2") // 32
try calculate("2+2*2+2*2+2*2+2*2+2*2+2*2+2*2+2*2") // 34
try calculate("2+2*2+2*2+2*2+2*2+2*2+2*2+2*2+2*2+2") // 36
try calculate("2+2*2+2*2+2*2+2*2+2*2+2*2+2*2+2*2+2*2") // 38
try calculate("2+2*2+2*2+2*2+2*2+2*2+2*2+2*2+2*2+2*2+2") // 40
try calculate("2+2*2+2*2+2*2+2*2+2*2+2*2+2*2+2*2+2*2+2*2") // 42
try calculate("2+2*2+2*2+2*2+2*2+2*2+2*2+2*2+2*2+2*2+2*2+2") // 44
try calculate("2+2*2+2*2+2*2+2while!operators.isEmpty && precedence(op) <= precedence(operators.last!) { // expected expression, var, or let in 'while' conditionwhile!operators.isEmpty { // expected expression, var, or let in 'while' conditionenum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
let tokens = tokenize(string)
let expression = try parse(tokens)
return evaluate(expression)
}
func tokenize(_ string: String) -> [Token] {
var tokens: [Token] = []
var currentToken = ""
for character in string {
switch character {
case "+", "-", "*", "/", "(":
if!currentToken.isEmpty {
tokens.append(.number(Double(currentToken)!))
currentToken = ""
}
tokens.append(.operator(character))
case " ":
if!currentToken.isEmpty {
tokens.append(.number(Double(currentToken)!))
currentToken = ""
}
case ")":
if!currentToken.isEmpty {
tokens.append(.number(Double(currentToken)!))
currentToken = ""
}
tokens.append(.operator(character))
return tokens
default:
currentToken.append(character)
}
}
return tokens
}
func parse(_ tokens: [Token]) throws -> Expression {
var stack: [Expression] = []
for token in tokens {
switch token {
case.number(let value):
stack.append(.number(value))
case.operator(let op):
switch op {
case "+":
let right = stack.removeLast()
let left = stack.removeLast()
stack.append(.addition(left, right))
case "-":
let right = stack.removeLast()
let left = stack.removeLast()
stack.append(.subtraction(left, right))
case "*":
let right = stack.removeLast()
let left = stack.removeLast()
stack.append(.multiplication(left, right))
case "/":
let right = stack.removeLast()
let left = stack.removeLast()
stack.append(.division(left, right))
case "(":
break
case ")":
throw CalculateError.invalidInput
default:
throw CalculateError.invalidInput
}
}
}
return stack.removeLast()
}
func evaluate(_ expression: Expression) -> Double {
switch expression {
case.number(let value):
return value
case.addition(let left, let right):
return evaluate(left) + evaluate(right)
case.subtraction(let left, let right):
return evaluate(left) - evaluate(right)
case.multiplication(let left, let right):
return evaluate(left) * evaluate(right)
case.division(let left, let right):
return evaluate(left) / evaluate(right)
}
}```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 = tokenize(string)
let expression = try parse(tokens)
return evaluate(expression)
}
// Tokenize string into array of tokens.
func tokenize(_ string: String) -> [Token] {
var tokens: [Token] = []
var currentToken = ""
for character in string {
switch character {
case "+", "-", "*", "/", "(":
if!currentToken.isEmpty {
tokens.append(.number(Double(currentToken)!))
currentToken = ""
}
tokens.append(.operator(character))
case " ":
if!currentToken.isEmpty {
tokens.append(.number(Double(currentToken)!))
currentToken = ""
}
case ")":
if!currentToken.isEmpty {
tokens.append(.number(Double(currentToken)!))
currentToken = ""
}
tokens.append(.operator(character))
return tokens
default:
currentToken.append(character)
}
}
return tokens
}
// Parse array of tokens into expression tree.
func parse(_ tokens: [Token]) throws -> Expression {
var stack: [Expression] = []
for token in tokens {
switch token {
case.number(let value):
stack.append(.number(value))
case.operator(let op):
switch op {
case "+":
let right = stack.removeLast()
let left = stack.removeLast()
stack.append(.addition(left, right))
case "-":
let right = stack.removeLast()
let left = stack.removeLast()
stack.append(.subtraction(left, right))
case "*":
let right = stack.removeLast()
let left = stack.removeLast()
stack.append(.multiplication(left, right))
case "/":
let right = stack.removeLast()
let left = stack.removeLast()
stack.append(.division(left, right))
case "(":
break
case ")":
throw CalculateError.invalidInput
default:
throw CalculateError.invalidInput
}
}
}
return stack.removeLast()
}
// Evaluate expression tree into a value.
func evaluate(_ expression: Expression) -> Double {
switch expression {
case.number(let value):
return value
case.addition(let left, let right):
return evaluate(left) + evaluate(right)
case.subtraction(let left, let right):
return evaluate(left) - evaluate(right)
case.multiplication(let left, let right):
return evaluate(left) * evaluate(right)
case.division(let left, let right):
return evaluate(left) / evaluate(right)
}
}
// Example usage.
let string = "2+2*2"
do {
let result = try calculate(string)
print(result)
} catch {
print(error)
}
```func tokenize(_ string: String) -> [Token] { // cannot find type 'Token' in scopevar tokens: [Token] = [] // cannot find type 'Token' in scopeif!currentToken.isEmpty { // expected expression, var, or let in 'if' conditionif!currentToken.isEmpty { // expected expression, var, or let in 'if' conditionif!currentToken.isEmpty { // expected expression, var, or let in 'if' conditionfunc parse(_ tokens: [Token]) throws -> Expression { // cannot find type 'Expression' in scopefunc parse(_ tokens: [Token]) throws -> Expression { // cannot find type 'Token' in scopevar stack: [Expression] = [] // cannot find type 'Expression' in scopefunc evaluate(_ expression: Expression) -> Double { // cannot find type 'Expression' in scopeenum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
let tokens = string.split(separator: " ").map(String.init)
var stack = [Double]()
for token in tokens {
if let number = Double(token) {
stack.append(number)
} else if let op = token.first {
guard stack.count >= 2 else {
throw CalculateError.invalidInput
}
let rhs = stack.removeLast()
let lhs = stack.removeLast()
switch op {
case "+": stack.append(lhs + rhs)
case "-": stack.append(lhs - rhs)
case "*": stack.append(lhs * rhs)
case "/": stack.append(lhs / rhs)
default: throw CalculateError.invalidInput
}
} 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.split(separator: " ").map(String.init)
var stack = [Double]()
for token in tokens {
if let number = Double(token) {
stack.append(number)
} else if let op = token.first {
guard stack.count >= 2 else {
throw CalculateError.invalidInput
}
let rhs = stack.removeLast()
let lhs = stack.removeLast()
switch op {
case "+": stack.append(lhs + rhs)
case "-": stack.append(lhs - rhs)
case "*": stack.append(lhs * rhs)
case "/": stack.append(lhs / rhs)
default: throw CalculateError.invalidInput
}
} else {
throw CalculateError.invalidInput
}
}
guard stack.count == 1 else {
throw CalculateError.invalidInput
}
return stack.removeLast()
}
try calculate("2+2*2") // 6.0
try calculate("2+2*2+2") // 8.0
try calculate("2+2*2+2*2") // 10.0
try calculate("2+2*2+2*2+2") // 12.0
try calculate("2+2*2+2*2+2*2") // 14.0
try calculate("2+2*2+2*2+2*2+2") // 16.0
try calculate("2+2*2+2*2+2*2+2*2") // 18.0
try calculate("2+2*2+2*2+2*2+2*2+2") // 20.0
try calculate("2+2*2+2*2+2*2+2*2+2*2") // 22.0
try calculate("2+2*2+2*2+2*2+2*2+2*2+2") // 24.0
try calculate("2+2*2+2*2+2*2+2*2+2*2+2*2") // 26.0
try calculate("2+2*2+2*2+2*2+2*2+2*2+2*2+2") // 28.0
try calculate("2+2*2+2*2+2*2+2*2+2*2+2*2+2*2") // 30.0
try calculate("2+2*2+2*2+2*2+2*2+2*2+2*2+2*2+2") // 32.0
try calculate("2+2*2+2*2+2*2+2*2+2*2+2*2+2*2+2*2") // 34.0
try calculate("2+2*2+2*2+2*2+2*2+2*2+2*2+2*2+2*2+2") // 36.0
try calculate("2+2*2+2*2+2*2+2*2+2*2+2*2+2*2+2*2+2*2") // 38.0
try calculate("2+2*2+2*2+2*2+2*2+2*2+2*2+2*2+2*2+2*2+2") // 40.0
try calculate("2+2*2+2*2+2*2+2*2+2*2+2*2+2*2+2*2+2*2+2*2") // 42.0
try calculate("2+2*2+2*2+2*2+2*2+2*2+2*2+2*2+2*2+2*2+2*2+2") // 44.0
try calculate("2+2*2+2*2+2*2+2*2+2*2+2*2+2*2+2*2+2*2+2*2+2*2") // 46.0
try calculate("2+2*2+2*2+2*2+2*2+2*2+2*2+2*2+2*2+2*2+2*2+2*2+2") // 48.0
try calculate("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.split(separator: " ").map(String.init)
var stack = [Double]()
for token in tokens {
if let number = Double(token) {
stack.append(number)
} else if let op = token.first {
guard stack.count >= 2 else {
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
}
} 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.split(separator: " ").map(String.init)
var stack = [Double]()
for token in tokens {
if let number = Double(token) {
stack.append(number)
} else if let op = token.first {
guard stack.count >= 2 else {
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
}
} else {
throw CalculateError.invalidInput
}
}
guard stack.count == 1 else {
throw CalculateError.invalidInput
}
return stack.removeLast()
}
do {
let result = try calculate("2+2*2")
print(result)
} catch {
print(error)
}
``` // Fatal error: Error raised at top level: Solution.CalculateError.invalidInputenum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
let tokens = string.split(separator: " ").map(String.init)
var stack = [Double]()
var operators = [String]()
for token in tokens {
switch token {
case "+":
operators.append(token)
case "-":
operators.append(token)
case "*":
operators.append(token)
case "/":
operators.append(token)
case "(":
operators.append(token)
case ")":
guard let op = operators.popLast() else {
throw CalculateError.invalidInput
}
switch op {
case "+":
guard let right = stack.popLast(), let left = stack.popLast() else {
throw CalculateError.invalidInput
}
stack.append(left + right)
case "-":
guard let right = stack.popLast(), let left = stack.popLast() else {
throw CalculateError.invalidInput
}
stack.append(left - right)
case "*":
guard let right = stack.popLast(), let left = stack.popLast() else {
throw CalculateError.invalidInput
}
stack.append(left * right)
case "/":
guard let right = stack.popLast(), let left = stack.popLast() else {
throw CalculateError.invalidInput
}
stack.append(left / right)
case "(":
break
default:
throw CalculateError.invalidInput
}
default:
guard let value = Double(token) else {
throw CalculateError.invalidInput
}
stack.append(value)
}
}
guard operators.isEmpty else {
throw CalculateError.invalidInput
}
return stack.popLast()!
}```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.split(separator: " ").map(String.init)
var stack = [Double]()
var operators = [String]()
for token in tokens {
switch token {
case "+":
operators.append(token)
case "-":
operators.append(token)
case "*":
operators.append(token)
case "/":
operators.append(token)
case "(":
operators.append(token)
case ")":
guard let op = operators.popLast() else {
throw CalculateError.invalidInput
}
switch op {
case "+":
guard let right = stack.popLast(), let left = stack.popLast() else {
throw CalculateError.invalidInput
}
stack.append(left + right)
case "-":
guard let right = stack.popLast(), let left = stack.popLast() else {
throw CalculateError.invalidInput
}
stack.append(left - right)
case "*":
guard let right = stack.popLast(), let left = stack.popLast() else {
throw CalculateError.invalidInput
}
stack.append(left * right)
case "/":
guard let right = stack.popLast(), let left = stack.popLast() else {
throw CalculateError.invalidInput
}
stack.append(left / right)
case "(":
break
default:
throw CalculateError.invalidInput
}
default:
guard let value = Double(token) else {
throw CalculateError.invalidInput
}
stack.append(value)
}
}
guard operators.isEmpty else {
throw CalculateError.invalidInput
}
return stack.popLast()!
}
``` // Fatal error: Error raised at top level: Solution.CalculateError.invalidInputfunc execute(binary: String, arguments: [String]) -> (String, String) {
let pipe = Pipe()
let errorPipe = Pipe()
let task = Process()
task.launchPath = binary
task.arguments = arguments
task.standardOutput = pipe
task.standardError = errorPipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let errorData = errorPipe.fileHandleForReading.readDataToEndOfFile()
return (String(data: data, encoding:.utf8)?? "", String(data: errorData, 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 pipe = Pipe()
let errorPipe = Pipe()
let task = Process()
task.launchPath = binary
task.arguments = arguments
task.standardOutput = pipe
task.standardError = errorPipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let errorData = errorPipe.fileHandleForReading.readDataToEndOfFile()
return (String(data: data, encoding:.utf8)?? "", String(data: errorData, encoding:.utf8)?? "")
}
```return (String(data: data, encoding:.utf8)?? "", String(data: errorData, encoding:.utf8)?? "") // expected ',' separatorreturn (String(data: data, encoding:.utf8)?? "", String(data: errorData, encoding:.utf8)?? "") // cannot use optional chaining on non-optional value of type 'String'return (String(data: data, encoding:.utf8)?? "", String(data: errorData, encoding:.utf8)?? "") // cannot convert return expression of type '(String?, String, String?)' to return type '(String, String)'return (String(data: data, encoding:.utf8)?? "", String(data: errorData, encoding:.utf8)?? "") // cannot use optional chaining on non-optional value of type 'String'```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)
```var (stdout, stderr) = execute(binary: "/bin/zsh", arguments: ["-c", "echo Hello!"]) // cannot find 'execute' in scopeXCTAssertEqual(stdout.trimmingCharacters(in: .whitespacesAndNewlines), "Hello!") // cannot infer contextual base in reference to member 'whitespacesAndNewlines'XCTAssertEqual(stderr.trimmingCharacters(in: .whitespacesAndNewlines), "") // cannot infer contextual base in reference to member 'whitespacesAndNewlines'(stdout, stderr) = execute(binary: "/usr/bin/xcodebuild", arguments: ["-version"]) // cannot find 'execute' in scope(stdout, stderr) = execute(binary: "/usr/bin/xcodebuild", arguments: ["version"]) // cannot find 'execute' in scopefunc execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let outpipe = Pipe()
task.standardOutput = outpipe
let errpipe = Pipe()
task.standardError = errpipe
task.launch()
let data = outpipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: String.Encoding.utf8)?? ""
let errData = errpipe.fileHandleForReading.readDataToEndOfFile()
let errOutput = String(data: errData, encoding: String.Encoding.utf8)?? ""
task.waitUntilExit()
return (output, errOutput)
}
func execute(binary: String, arguments: [String]) -> String {
let (output, _) = execute(binary: binary, arguments: arguments)
return output
}
func executeErr(binary: String, arguments: [String]) -> String {
let (_, errOutput) = execute(binary: binary, arguments: arguments)
return errOutput
}```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 outpipe = Pipe()
task.standardOutput = outpipe
let errpipe = Pipe()
task.standardError = errpipe
task.launch()
let data = outpipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: String.Encoding.utf8)?? ""
let errData = errpipe.fileHandleForReading.readDataToEndOfFile()
let errOutput = String(data: errData, encoding: String.Encoding.utf8)?? ""
task.waitUntilExit()
return (output, errOutput)
}
// Function to execute binary with arguments and return stdout.
func execute(binary: String, arguments: [String]) -> String {
let (output, _) = execute(binary: binary, arguments: arguments)
return output
}
// Function to execute binary with arguments and return stderr.
func executeErr(binary: String, arguments: [String]) -> String {
let (_, errOutput) = execute(binary: binary, arguments: arguments)
return errOutput
}
```let output = String(data: data, encoding: String.Encoding.utf8)?? "" // consecutive statements on a line must be separated by ';'let output = String(data: data, encoding: String.Encoding.utf8)?? "" // cannot use optional chaining on non-optional value of type 'String'let output = String(data: data, encoding: String.Encoding.utf8)?? "" // string literal is unusedlet errOutput = String(data: errData, encoding: String.Encoding.utf8)?? "" // string literal is unusedlet errOutput = String(data: errData, encoding: String.Encoding.utf8)?? "" // cannot use optional chaining on non-optional value of type 'String'let errOutput = String(data: errData, encoding: String.Encoding.utf8)?? "" // consecutive statements on a line must be separated by ';'```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)
```var (stdout, stderr) = execute(binary: "/bin/zsh", arguments: ["-c", "echo Hello!"]) // cannot find 'execute' in scopeXCTAssertEqual(stdout.trimmingCharacters(in: .whitespacesAndNewlines), "Hello!") // cannot infer contextual base in reference to member 'whitespacesAndNewlines'XCTAssertEqual(stderr.trimmingCharacters(in: .whitespacesAndNewlines), "") // cannot infer contextual base in reference to member 'whitespacesAndNewlines'(stdout, stderr) = execute(binary: "/usr/bin/xcodebuild", arguments: ["-version"]) // cannot find 'execute' in scope(stdout, stderr) = execute(binary: "/usr/bin/xcodebuild", arguments: ["version"]) // cannot find 'execute' in scopefunc execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let outpipe = Pipe()
task.standardOutput = outpipe
let errpipe = Pipe()
task.standardError = errpipe
task.launch()
let data = outpipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding:.utf8)?? ""
let errdata = errpipe.fileHandleForReading.readDataToEndOfFile()
let err = String(data: errdata, encoding:.utf8)?? ""
task.waitUntilExit()
return (output, err)
}
func execute(binary: String, arguments: [String]) -> String {
let (output, _) = execute(binary: binary, arguments: arguments)
return output
}
func executeErr(binary: String, arguments: [String]) -> String {
let (_, err) = execute(binary: binary, arguments: arguments)
return err
}```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 outpipe = Pipe()
task.standardOutput = outpipe
let errpipe = Pipe()
task.standardError = errpipe
task.launch()
let data = outpipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding:.utf8)?? ""
let errdata = errpipe.fileHandleForReading.readDataToEndOfFile()
let err = String(data: errdata, encoding:.utf8)?? ""
task.waitUntilExit()
return (output, err)
}
// Function to execute binary with arguments and return stdout.
func execute(binary: String, arguments: [String]) -> String {
let (output, _) = execute(binary: binary, arguments: arguments)
return output
}
// Function to execute binary with arguments and return stderr.
func executeErr(binary: String, arguments: [String]) -> String {
let (_, err) = execute(binary: binary, arguments: arguments)
return err
}
```let output = String(data: data, encoding:.utf8)?? "" // cannot use optional chaining on non-optional value of type 'String'let output = String(data: data, encoding:.utf8)?? "" // string literal is unusedlet output = String(data: data, encoding:.utf8)?? "" // consecutive statements on a line must be separated by ';'let err = String(data: errdata, encoding:.utf8)?? "" // consecutive statements on a line must be separated by ';'let err = String(data: errdata, encoding:.utf8)?? "" // string literal is unusedlet err = String(data: errdata, encoding:.utf8)?? "" // cannot use optional chaining on non-optional value of type 'String'func execute(binary: String, arguments: [String]) -> (String, String) {
let pipe = Pipe()
let errorPipe = Pipe()
let task = Process()
task.launchPath = binary
task.arguments = arguments
task.standardOutput = pipe
task.standardError = errorPipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let errorData = errorPipe.fileHandleForReading.readDataToEndOfFile()
return (String(data: data, encoding:.utf8)?? "", String(data: errorData, encoding:.utf8)?? "")
}
func execute(binary: String, arguments: [String]) -> String {
return execute(binary: binary, arguments: arguments).0
}
func executeError(binary: String, arguments: [String]) -> String {
return execute(binary: binary, arguments: arguments).1
}```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 pipe = Pipe()
let errorPipe = Pipe()
let task = Process()
task.launchPath = binary
task.arguments = arguments
task.standardOutput = pipe
task.standardError = errorPipe
task.launch()
task.waitUntilExit()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let errorData = errorPipe.fileHandleForReading.readDataToEndOfFile()
return (String(data: data, encoding:.utf8)?? "", String(data: errorData, encoding:.utf8)?? "")
}
// Function to execute binary with arguments and return stdout.
func execute(binary: String, arguments: [String]) -> String {
return execute(binary: binary, arguments: arguments).0
}
// Function to execute binary with arguments and return stderr.
func executeError(binary: String, arguments: [String]) -> String {
return execute(binary: binary, arguments: arguments).1
}
```return (String(data: data, encoding:.utf8)?? "", String(data: errorData, encoding:.utf8)?? "") // cannot use optional chaining on non-optional value of type 'String'return (String(data: data, encoding:.utf8)?? "", String(data: errorData, encoding:.utf8)?? "") // cannot use optional chaining on non-optional value of type 'String'return (String(data: data, encoding:.utf8)?? "", String(data: errorData, encoding:.utf8)?? "") // expected ',' separatorreturn (String(data: data, encoding:.utf8)?? "", String(data: errorData, encoding:.utf8)?? "") // cannot convert return expression of type '(String?, String, String?)' to return type '(String, String)'func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let outpipe = Pipe()
task.standardOutput = outpipe
let errpipe = Pipe()
task.standardError = errpipe
task.launch()
let data = outpipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding:.utf8)!
let errdata = errpipe.fileHandleForReading.readDataToEndOfFile()
let err = String(data: errdata, encoding:.utf8)!
task.waitUntilExit()
return (output, err)
}```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 outpipe = Pipe()
task.standardOutput = outpipe
let errpipe = Pipe()
task.standardError = errpipe
task.launch()
let data = outpipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding:.utf8)!
let errdata = errpipe.fileHandleForReading.readDataToEndOfFile()
let err = String(data: errdata, encoding:.utf8)!
task.waitUntilExit()
return (output, err)
}
```func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let outpipe = Pipe()
task.standardOutput = outpipe
let errpipe = Pipe()
task.standardError = errpipe
task.launch()
let data = outpipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding:.utf8)!
let errdata = errpipe.fileHandleForReading.readDataToEndOfFile()
let err = String(data: errdata, encoding:.utf8)!
task.waitUntilExit()
return (output, err)
}
func execute(binary: String, arguments: [String]) -> String {
let (output, _) = execute(binary: binary, arguments: arguments)
return output
}
func executeErr(binary: String, arguments: [String]) -> String {
let (_, err) = execute(binary: binary, arguments: arguments)
return err
}```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 outpipe = Pipe()
task.standardOutput = outpipe
let errpipe = Pipe()
task.standardError = errpipe
task.launch()
let data = outpipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding:.utf8)!
let errdata = errpipe.fileHandleForReading.readDataToEndOfFile()
let err = String(data: errdata, encoding:.utf8)!
task.waitUntilExit()
return (output, err)
}
// Function to execute binary with arguments and return stdout.
func execute(binary: String, arguments: [String]) -> String {
let (output, _) = execute(binary: binary, arguments: arguments)
return output
}
// Function to execute binary with arguments and return stderr.
func executeErr(binary: String, arguments: [String]) -> String {
let (_, err) = execute(binary: binary, arguments: arguments)
return err
}
```func execute(binary: String, arguments: [String]) -> (String, String) {
let pipe = Pipe()
let errorPipe = Pipe()
let task = Process()
task.launchPath = binary
task.arguments = arguments
task.standardOutput = pipe
task.standardError = errorPipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let errorData = errorPipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding:.utf8)!
let error = String(data: errorData, encoding:.utf8)!
return (output, error)
}
func execute(binary: String, arguments: [String]) -> String {
let (output, _) = execute(binary: binary, arguments: arguments)
return output
}
func executeError(binary: String, arguments: [String]) -> String {
let (_, error) = execute(binary: binary, arguments: arguments)
return error
}```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 pipe = Pipe()
let errorPipe = Pipe()
let task = Process()
task.launchPath = binary
task.arguments = arguments
task.standardOutput = pipe
task.standardError = errorPipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let errorData = errorPipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding:.utf8)!
let error = String(data: errorData, encoding:.utf8)!
return (output, error)
}
// Function to execute binary with arguments and return stdout.
func execute(binary: String, arguments: [String]) -> String {
let (output, _) = execute(binary: binary, arguments: arguments)
return output
}
// Function to execute binary with arguments and return stderr.
func executeError(binary: String, arguments: [String]) -> String {
let (_, error) = execute(binary: binary, arguments: arguments)
return error
}
```func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let outpipe = Pipe()
task.standardOutput = outpipe
let errpipe = Pipe()
task.standardError = errpipe
task.launch()
let data = outpipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: String.Encoding.utf8)!
let errdata = errpipe.fileHandleForReading.readDataToEndOfFile()
let err = String(data: errdata, encoding: String.Encoding.utf8)!
task.waitUntilExit()
return (output, err)
}```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 outpipe = Pipe()
task.standardOutput = outpipe
let errpipe = Pipe()
task.standardError = errpipe
task.launch()
let data = outpipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: String.Encoding.utf8)!
let errdata = errpipe.fileHandleForReading.readDataToEndOfFile()
let err = String(data: errdata, encoding: String.Encoding.utf8)!
task.waitUntilExit()
return (output, err)
}
```func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { cache[$0]?? (cache[$0] = function($0)) }
}```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 { cache[$0]?? (cache[$0] = function($0)) }
}
// Example usage
let fibonacci = memoize { (n: Int) -> Int in
if n < 2 {
return n
} else {
return fibonacci(n - 1) + fibonacci(n - 2)
}
}
print(fibonacci(10)) // Output: 55
```return { cache[$0]?? (cache[$0] = function($0)) } // cannot convert value of type 'Optional<_>' to closure result type 'U'return { cache[$0]?? (cache[$0] = function($0)) } // cannot call value of non-function type 'U'return { cache[$0]?? (cache[$0] = function($0)) } // cannot use optional chaining on non-optional value of type 'U'func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache: [T: U] = [:]
return { cache[$0]?? (cache[$0] = function($0)) }
}```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 { cache[$0]?? (cache[$0] = function($0)) }
}
// Memoized version of the fibonacci function.
let fibonacci = memoize { (n: Int) -> Int in
if n < 2 {
return n
} else {
return fibonacci(n - 1) + fibonacci(n - 2)
}
}
// Test the memoized version of the fibonacci function.
for i in 0...10 {
print(fibonacci(i))
}
```return { cache[$0]?? (cache[$0] = function($0)) } // cannot convert value of type 'Optional<_>' to closure result type 'U'return { cache[$0]?? (cache[$0] = function($0)) } // cannot call value of non-function type 'U'return { cache[$0]?? (cache[$0] = function($0)) } // cannot use optional chaining on non-optional value of type 'U'func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { key in
if let value = cache[key] {
return value
} else {
let value = function(key)
cache[key] = value
return value
}
}
}```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 { key in
if let value = cache[key] {
return value
} else {
let value = function(key)
cache[key] = value
return value
}
}
}
// Memoized fibonacci function.
let fibonacci = memoize { (n: Int) -> Int in
if n == 0 || n == 1 {
return n
} else {
return fibonacci(n - 1) + fibonacci(n - 2)
}
}
// Test the memoized function.
for i in 0...10 {
print(fibonacci(i))
}
```func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { cache[$0]?? (cache[$0] = function($0)) }
}```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 { cache[$0]?? (cache[$0] = function($0)) }
}
// 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 { cache[$0]?? (cache[$0] = function($0)) }
}
// 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 { cache[$0]?? (cache[$0] = function($0)) }
}
```return { cache[$0]?? (cache[$0] = function($0)) } // cannot convert value of type 'Optional<_>' to closure result type 'U'return { cache[$0]?? (cache[$0] = function($0)) } // cannot call value of non-function type 'U'return { cache[$0]?? (cache[$0] = function($0)) } // cannot use optional chaining on non-optional value of type 'U'func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache: [T: U] = [:]
return { (arg: T) -> U in
if let cachedResult = cache[arg] {
return cachedResult
}
let result = function(arg)
cache[arg] = result
return result
}
}
func fibonacci(_ n: Int) -> Int {
if n < 2 {
return n
}
return fibonacci(n - 1) + fibonacci(n - 2)
}```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 cachedResult = cache[arg] {
return cachedResult
}
let result = function(arg)
cache[arg] = result
return result
}
}
// Example usage:
func fibonacci(_ n: Int) -> Int {
if n < 2 {
return n
}
return fibonacci(n - 1) + fibonacci(n - 2)
}
let memoizedFibonacci = memoize(fibonacci)
print(memoizedFibonacci(10)) // Output: 55
```func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { key in
if let value = cache[key] {
return value
} else {
let value = function(key)
cache[key] = value
return value
}
}
}```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 { key in
if let value = cache[key] {
return value
} else {
let value = function(key)
cache[key] = value
return value
}
}
}
// Memoized fibonacci function.
let fibonacci = memoize { (n: Int) -> Int in
if n < 2 {
return n
} else {
return fibonacci(n - 1) + fibonacci(n - 2)
}
}
// Memoized factorial function.
let factorial = memoize { (n: Int) -> Int in
if n == 0 {
return 1
} else {
return n * factorial(n - 1)
}
}
```func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var memo = [T: U]()
var result: U!
return { (x: T) in
if let q = memo[x] { return q }
result = function(x)
memo[x] = 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 memo = [T: U]()
var result: U!
return { (x: T) in
if let q = memo[x] { return q }
result = function(x)
memo[x] = result
return result
}
}
// Memoized factorial function.
let factorial = memoize { (n: Int) in
n < 2? 1 : n * factorial(n - 1)
}
// Memoized Fibonacci function.
let fibonacci = memoize { (n: Int) in
n < 2? n : fibonacci(n - 1) + fibonacci(n - 2)
}
// Memoized Ackermann function.
let ackermann = memoize { (m: Int, n: Int) in
(m, n) == (0, 0)? 1 :
m == 0? n + 1 :
n == 0? ackermann(m - 1, 1) :
ackermann(m - 1, ackermann(m, n - 1))
}
```func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache: [T: U] = [:]
return {
if let cachedResult = cache[$0] {
return cachedResult
} else {
let result = function($0)
cache[$0] = 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 {
if let cachedResult = cache[$0] {
return cachedResult
} else {
let result = function($0)
cache[$0] = result
return result
}
}
}
// Example usage:
let fibonacci: (Int) -> Int = memoize { n in
if n <= 1 {
return n
} else {
return fibonacci(n - 1) + fibonacci(n - 2)
}
}
print(fibonacci(10)) // Output: 55
```func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var memo = [T: U]()
var result: U!
return { (x: T) -> U in
if let q = memo[x] { return q }
result = function(x)
memo[x] = 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 memo = [T: U]()
var result: U!
return { (x: T) -> U in
if let q = memo[x] { return q }
result = function(x)
memo[x] = result
return result
}
}
// Memoized version of the fibonacci function.
let fibonacci = memoize { (n: Int) -> Int in
if n < 2 { return n }
return fibonacci(n - 1) + fibonacci(n - 2)
}
// Test the memoized function.
for i in 0...10 {
print(fibonacci(i))
}
```func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var memo = [T: U]()
var result: U!
return { (x: T) -> U in
if let q = memo[x] { return q }
result = function(x)
memo[x] = 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 memo = [T: U]()
var result: U!
return { (x: T) -> U in
if let q = memo[x] { return q }
result = function(x)
memo[x] = result
return result
}
}
// Memoization function that caches the results of expensive computations.
func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var memo = [T: U]()
var result: U!
return { (x: T) -> U in
if let q = memo[x] { return q }
result = function(x)
memo[x] = result
return result
}
}
``````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
```let result: String = try retry(attempts: 3) { // cannot find 'retry' in scope```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
```let result: String = try retry(attempts: 3) { // cannot find 'retry' in scope```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
```let result: String = try retry(attempts: 3) { // cannot find 'retry' in scope```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
```let result: String = try retry(attempts: 3) { // cannot find 'retry' in scopefunc retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
for i in 0..< attempts {
do {
return try task()
} catch {
if i == attempts - 1 {
throw error
}
}
}
throw error
}
func retry<T, E: Error>(attempts: Int, task: @escaping () throws -> T) throws -> T where E == Error {
for i in 0..< attempts {
do {
return try task()
} catch let error as E {
if i == attempts - 1 {
throw error
}
}
}
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 {
for i in 0..< attempts {
do {
return try task()
} catch {
if i == attempts - 1 {
throw error
}
}
}
throw error
}
// Retry mechanism that retries a task a specified number of times before failing.
// The task is retried if it throws an error that matches the specified error type.
func retry<T, E: Error>(attempts: Int, task: @escaping () throws -> T) throws -> T where E == Error {
for i in 0..< attempts {
do {
return try task()
} catch let error as E {
if i == attempts - 1 {
throw error
}
}
}
throw error
}
```for i in 0..< attempts { // '..<' is not a postfix unary operatorfor i in 0..< attempts { // expected '{' to start the body of for-each loopthrow error // thrown expression type '(String) -> ()' does not conform to 'Error'throw error // expansion of macro 'error' requires leading '#'func retry<T, E: Error>(attempts: Int, task: @escaping () throws -> T) throws -> T where E == Error { // generic parameter 'E' is not used in function signaturefunc retry<T, E: Error>(attempts: Int, task: @escaping () throws -> T) throws -> T where E == Error { // same-type requirement makes generic parameter 'E' non-generic; this is an error in Swift 6for i in 0..< attempts { // '..<' is not a postfix unary operatorfor i in 0..< attempts { // expected '{' to start the body of for-each loopthrow error // expansion of macro 'error' requires leading '#'throw error // thrown expression type '(String) -> ()' does not conform to 'Error'let result: String = try retry(attempts: 3) { // ambiguous use of 'retry(attempts:task:)'```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
```let result: String = try retry(attempts: 3) { // cannot find 'retry' in scope```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
```let result: String = try retry(attempts: 3) { // cannot find 'retry' in scope```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
```let result: String = try retry(attempts: 3) { // cannot find 'retry' in scope```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
```let result: String = try retry(attempts: 3) { // cannot find 'retry' in scope```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
```let result: String = try retry(attempts: 3) { // cannot find 'retry' in scopeprotocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
class DIContainer: DIContainerProtocol {
private var factories: [String: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
let key = String(describing: type)
factories[key] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
let key = String(describing: type)
guard let factory = factories[key] 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: [String: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
let key = String(describing: type)
factories[key] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
let key = String(describing: type)
guard let factory = factories[key] 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: [String: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[String(describing: type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = factories[String(describing: 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: [String: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[String(describing: type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = factories[String(describing: 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: [String: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
let key = String(describing: type)
factories[key] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
let key = String(describing: type)
guard let factory = factories[key] 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: [String: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
let key = String(describing: type)
factories[key] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
let key = String(describing: type)
guard let factory = factories[key] 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: [String: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[String(describing: type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = factories[String(describing: 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: [String: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[String(describing: type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = factories[String(describing: 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: [String: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[String(describing: type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = factories[String(describing: 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: [String: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[String(describing: type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = factories[String(describing: 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 registry: [String: Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
registry[String(describing: type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = registry[String(describing: type)] as? () -> T else {
return nil
}
return factory()
}
}```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 registry: [String: Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
registry[String(describing: type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = registry[String(describing: type)] as? () -> T else {
return nil
}
return factory()
}
}
```protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
class DIContainer: DIContainerProtocol {
private var factories: [String: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[String(describing: type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = factories[String(describing: 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: [String: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[String(describing: type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = factories[String(describing: 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: [String: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
let key = String(describing: type)
factories[key] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
let key = String(describing: type)
guard let factory = factories[key] 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: [String: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
let key = String(describing: type)
factories[key] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
let key = String(describing: type)
guard let factory = factories[key] 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: [String: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[String(describing: type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = factories[String(describing: 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: [String: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[String(describing: type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = factories[String(describing: 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: [String: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
let key = String(describing: type)
factories[key] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
let key = String(describing: type)
guard let factory = factories[key] 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: [String: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
let key = String(describing: type)
factories[key] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
let key = String(describing: type)
guard let factory = factories[key] 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: Hashable, Event: Hashable>: StateMachineProtocol {
private var state: State
private var transitions: [State: [Event: State]] = [:]
required init(state: State) {
self.state = state
}
func trigger(event: Event) {
guard let nextState = transitions[state]?[event] else {
fatalError("No transition for state \(state) and event \(event)")
}
state = nextState
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = 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: Hashable, Event: Hashable>: StateMachineProtocol {
private var state: State
private var transitions: [State: [Event: State]] = [:]
required init(state: State) {
self.state = state
}
func trigger(event: Event) {
guard let nextState = transitions[state]?[event] else {
fatalError("No transition for state \(state) and event \(event)")
}
state = nextState
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}
```private var state: State // property 'state' must be declared internal because it matches a requirement in internal protocol 'StateMachineProtocol'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: Hashable, Event: Hashable>: StateMachineProtocol {
private var state: State
private var transitions: [State: [Event: State]] = [:]
required init(state: State) {
self.state = state
}
func trigger(event: Event) {
guard let nextState = transitions[state]?[event] else {
return
}
state = nextState
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = 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: Hashable, Event: Hashable>: StateMachineProtocol {
private var state: State
private var transitions: [State: [Event: State]] = [:]
required init(state: State) {
self.state = state
}
func trigger(event: Event) {
guard let nextState = transitions[state]?[event] else {
return
}
state = nextState
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}
```private var state: State // property 'state' must be declared internal because it matches a requirement in internal protocol 'StateMachineProtocol'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: Hashable, Event: Hashable>: StateMachineProtocol {
private var state: State
private var transitions: [State: [Event: State]] = [:]
required init(state: State) {
self.state = state
}
func trigger(event: Event) {
guard let nextState = transitions[state]?[event] else {
return
}
state = nextState
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = 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: Hashable, Event: Hashable>: StateMachineProtocol {
private var state: State
private var transitions: [State: [Event: State]] = [:]
required init(state: State) {
self.state = state
}
func trigger(event: Event) {
guard let nextState = transitions[state]?[event] else {
return
}
state = nextState
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}
```private var state: State // property 'state' must be declared internal because it matches a requirement in internal protocol 'StateMachineProtocol'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: Hashable, Event: Hashable>: StateMachineProtocol {
private var state: State
private var transitions: [State: [Event: State]] = [:]
required init(state: State) {
self.state = state
}
func trigger(event: Event) {
guard let nextState = transitions[state]?[event] else {
fatalError("No transition found for state \(state) and event \(event)")
}
state = nextState
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}
class PredefinedStateMachine<State: Hashable, Event: Hashable>: StateMachineProtocol {
private var state: State
private var transitions: [State: [Event: State]] = [:]
required init(state: State) {
self.state = state
}
func trigger(event: Event) {
guard let nextState = transitions[state]?[event] else {
fatalError("No transition found for state \(state) and event \(event)")
}
state = nextState
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = 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: Hashable, Event: Hashable>: StateMachineProtocol {
private var state: State
private var transitions: [State: [Event: State]] = [:]
required init(state: State) {
self.state = state
}
func trigger(event: Event) {
guard let nextState = transitions[state]?[event] else {
fatalError("No transition found for state \(state) and event \(event)")
}
state = nextState
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}
// State machine with predefined transitions.
class PredefinedStateMachine<State: Hashable, Event: Hashable>: StateMachineProtocol {
private var state: State
private var transitions: [State: [Event: State]] = [:]
required init(state: State) {
self.state = state
}
func trigger(event: Event) {
guard let nextState = transitions[state]?[event] else {
fatalError("No transition found for state \(state) and event \(event)")
}
state = nextState
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}
// State machine with predefined transitions.
class PredefinedStateMachine<State: Hashable, Event: Hashable>: StateMachineProtocol {
private var state: State
private var transitions: [State: [Event: State]] = [:]
required init(state: State) {
self.state = state
}
func trigger(event: Event) {
guard let nextState = transitions[state]?[event] else {
fatalError("No transition found for state \(state) and event \(event)")
}
state = nextState
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}
```private var state: State // property 'state' must be declared internal because it matches a requirement in internal protocol 'StateMachineProtocol'private var state: State // property 'state' must be declared internal because it matches a requirement in internal protocol 'StateMachineProtocol'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: Hashable, Event: Hashable>: StateMachineProtocol {
private var state: State
private var transitions: [State: [Event: State]] = [:]
required init(state: State) {
self.state = state
}
func trigger(event: Event) {
guard let transition = transitions[state]?[event] else {
return
}
state = transition
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = 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: Hashable, Event: Hashable>: StateMachineProtocol {
private var state: State
private var transitions: [State: [Event: State]] = [:]
required init(state: State) {
self.state = state
}
func trigger(event: Event) {
guard let transition = transitions[state]?[event] else {
return
}
state = transition
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}
```private var state: State // property 'state' must be declared internal because it matches a requirement in internal protocol 'StateMachineProtocol'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: Hashable, Event: Hashable>: StateMachineProtocol {
private var state: State
private var transitions: [State: [Event: State]] = [:]
required init(state: State) {
self.state = state
}
func trigger(event: Event) {
guard let transition = transitions[state]?[event] else {
fatalError("No transition found for state \(state) and event \(event)")
}
state = transition
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = 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: Hashable, Event: Hashable>: StateMachineProtocol {
private var state: State
private var transitions: [State: [Event: State]] = [:]
required init(state: State) {
self.state = state
}
func trigger(event: Event) {
guard let transition = transitions[state]?[event] else {
fatalError("No transition found for state \(state) and event \(event)")
}
state = transition
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}
```private var state: State // property 'state' must be declared internal because it matches a requirement in internal protocol 'StateMachineProtocol'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: Hashable, Event: Hashable>: StateMachineProtocol {
private var state: State
private var transitions: [State: [Event: State]] = [:]
required init(state: State) {
self.state = state
}
func trigger(event: Event) {
guard let transition = transitions[state]?[event] else {
fatalError("No transition found for state \(state) and event \(event)")
}
state = transition
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = 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: Hashable, Event: Hashable>: StateMachineProtocol {
private var state: State
private var transitions: [State: [Event: State]] = [:]
required init(state: State) {
self.state = state
}
func trigger(event: Event) {
guard let transition = transitions[state]?[event] else {
fatalError("No transition found for state \(state) and event \(event)")
}
state = transition
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}
```private var state: State // property 'state' must be declared internal because it matches a requirement in internal protocol 'StateMachineProtocol'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: Hashable, Event: Hashable>: StateMachineProtocol {
private var state: State
private var transitions: [State: [Event: State]] = [:]
required init(state: State) {
self.state = state
}
func trigger(event: Event) {
guard let nextState = transitions[state]?[event] else {
fatalError("No transition for state \(state) and event \(event)")
}
state = nextState
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = 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: Hashable, Event: Hashable>: StateMachineProtocol {
private var state: State
private var transitions: [State: [Event: State]] = [:]
required init(state: State) {
self.state = state
}
func trigger(event: Event) {
guard let nextState = transitions[state]?[event] else {
fatalError("No transition for state \(state) and event \(event)")
}
state = nextState
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}
```private var state: State // property 'state' must be declared internal because it matches a requirement in internal protocol 'StateMachineProtocol'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: Hashable, Event: Hashable>: StateMachineProtocol {
private var state: State
private var transitions: [State: [Event: State]] = [:]
required init(state: State) {
self.state = state
}
func trigger(event: Event) {
guard let nextState = transitions[state]?[event] else {
return
}
state = nextState
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}
class PredefinedStateMachine<State: Hashable, Event: Hashable>: StateMachine<State, Event> {
init(state: State) {
super.init(state: state)
registerTransitions()
}
func registerTransitions() {
// Register transitions here
}
}```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: [State: [Event: State]] = [:]
required init(state: State) {
self.state = state
}
func trigger(event: Event) {
guard let nextState = transitions[state]?[event] else {
return
}
state = nextState
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}
// State machine with predefined transitions between states.
class PredefinedStateMachine<State: Hashable, Event: Hashable>: StateMachine<State, Event> {
init(state: State) {
super.init(state: state)
registerTransitions()
}
func registerTransitions() {
// Register transitions here
}
}
```private var state: State // property 'state' must be declared internal because it matches a requirement in internal protocol 'StateMachineProtocol'init(state: State) { // 'required' modifier must be present on all overrides of a required initializerprotocol 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: [State: [Event: State]] = [:]
required init(state: State) {
self.state = state
}
func trigger(event: Event) {
guard let nextState = transitions[state]?[event] else {
fatalError("No transition found for event \(event) in state \(state)")
}
state = nextState
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = 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: Hashable, Event: Hashable>: StateMachineProtocol {
private var state: State
private var transitions: [State: [Event: State]] = [:]
required init(state: State) {
self.state = state
}
func trigger(event: Event) {
guard let nextState = transitions[state]?[event] else {
fatalError("No transition found for event \(event) in state \(state)")
}
state = nextState
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}
```private var state: State // property 'state' must be declared internal because it matches a requirement in internal protocol 'StateMachineProtocol'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 name, let size):
return size
case.directory(let name, 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 1
case.directory(_, let contents):
return contents.map { $0.treeDepth }.max()?? 0
}
}
}
extension FileSystemNode {
func calculateMetadata() -> (totalSize: Int, filesCount: Int, treeDepth: Int) {
return (totalSize, filesCount, 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 name, let size):
return size
case.directory(let name, 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 1
case.directory(_, let contents):
return contents.map { $0.treeDepth }.max()?? 0
}
}
}
// Concrete 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 {
func calculateMetadata() -> (totalSize: Int, filesCount: Int, treeDepth: Int) {
return (totalSize, filesCount, treeDepth)
}
}
```case.file(let name, let size): // immutable value 'name' was never used; consider replacing with '_' or removing itcase.directory(let name, let contents): // immutable value 'name' was never used; consider replacing with '_' or removing itreturn contents.map { $0.treeDepth }.max()?? 0 // cannot use optional chaining on non-optional value of type 'Int'return contents.map { $0.treeDepth }.max()?? 0 // value of optional type 'Int?' must be unwrapped to a value of type 'Int'return contents.map { $0.treeDepth }.max()?? 0 // integer literal is unusedreturn contents.map { $0.treeDepth }.max()?? 0 // consecutive statements on a line must be separated by ';'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 name, let size):
return size
case.directory(let name, 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 1
case.directory(_, let contents):
return contents.reduce(1) { max($0, $1.treeDepth) }
}
}
}
class FileSystemManager {
static func createFileSystem(from input: [String]) -> FileSystemNode {
let root = FileSystemNode.directory(name: "/", contents: [])
var currentDirectory = root
for line in input {
let components = line.components(separatedBy: " ")
let command = components[0]
let name = components[1]
switch command {
case "mkdir":
currentDirectory.contents.append(.directory(name: name, contents: []))
case "touch":
currentDirectory.contents.append(.file(name: name, size: Int(components[2])!))
case "cd":
if name == ".." {
currentDirectory = currentDirectory.parentDirectory!
} else {
currentDirectory = currentDirectory.childDirectory(withName: name)!
}
default:
break
}
}
return root
}
static func printFileSystem(from root: FileSystemNode) {
print(root.description)
}
}
extension FileSystemNode {
var parentDirectory: FileSystemNode? {
switch self {
case.file:
return nil
case.directory(let name, let contents):
return contents.first { $0.name == ".." }
}
}
func childDirectory(withName name: String) -> FileSystemNode? {
switch self {
case.file:
return nil
case.directory(let name, let contents):
return contents.first { $0.name == name }
}
}
}
extension FileSystemNode: CustomStringConvertible {
var name: String {
switch self {
case.file(let name, _):
return name
case.directory(let name, _):
return name
}
}
var description: String {
switch self {
case.file(let name, let size):
return "\(name) \(size)"
case.directory(let name, let contents):
let contentsDescription = contents.map { $0.description }.joined(separator: "\n")
return "\(name)\n\(contentsDescription)"
}
}
}```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 name, let size):
return size
case.directory(let name, 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 1
case.directory(_, let contents):
return contents.reduce(1) { max($0, $1.treeDepth) }
}
}
}
// Concrete file system manager.
// Used to create file system nodes and print them.
class FileSystemManager {
static func createFileSystem(from input: [String]) -> FileSystemNode {
let root = FileSystemNode.directory(name: "/", contents: [])
var currentDirectory = root
for line in input {
let components = line.components(separatedBy: " ")
let command = components[0]
let name = components[1]
switch command {
case "mkdir":
currentDirectory.contents.append(.directory(name: name, contents: []))
case "touch":
currentDirectory.contents.append(.file(name: name, size: Int(components[2])!))
case "cd":
if name == ".." {
currentDirectory = currentDirectory.parentDirectory!
} else {
currentDirectory = currentDirectory.childDirectory(withName: name)!
}
default:
break
}
}
return root
}
static func printFileSystem(from root: FileSystemNode) {
print(root.description)
}
}
// File system node extensions.
// Used to get parent directory and child directory by name.
extension FileSystemNode {
var parentDirectory: FileSystemNode? {
switch self {
case.file:
return nil
case.directory(let name, let contents):
return contents.first { $0.name == ".." }
}
}
func childDirectory(withName name: String) -> FileSystemNode? {
switch self {
case.file:
return nil
case.directory(let name, let contents):
return contents.first { $0.name == name }
}
}
}
// File system node description.
// Used to print file system nodes.
extension FileSystemNode: CustomStringConvertible {
var name: String {
switch self {
case.file(let name, _):
return name
case.directory(let name, _):
return name
}
}
var description: String {
switch self {
case.file(let name, let size):
return "\(name) \(size)"
case.directory(let name, let contents):
let contentsDescription = contents.map { $0.description }.joined(separator: "\n")
return "\(name)\n\(contentsDescription)"
}
}
}
// Input data.
let input = [
"mkdir /",
"mkdir /usr",
"mkdir /usr/local",
"mkdir /usr/local/bin",
"touch /usr/local/bin/vi 1024",
"touch /usr/local/bin/vim 2048",
"mkdir /usr/local/share",
"mkdir /usr/local/share/man",
"mkdir /usr/local/share/man/man1",
"touch /usr/local/share/man/man1/ls.1 8192",
"touch /usr/local/share/man/man1/find.1 4096",
"touch /usr/local/share/man/man1/grep.1 4096",
"cd /usr/local/share/man/man1",
"ls",
"cd /usr/local/bin",
"ls",
"cd..",
"ls",
"cd /usr/local/share/man",
"ls",
"cd..",
"ls",
"cd /usr/local",
"ls",
"cd /usr",
"ls",
"cd /",
"ls",
"cd..",
"ls",
"cd /usr/local/share/man/man1",
"find",
"cd /usr/local/share/man/man1",
"grep"
]
// Create file system.
let root = FileSystemManager.createFileSystem(fromcase.file(let name, let size): // immutable value 'name' was never used; consider replacing with '_' or removing itcase.directory(let name, let contents): // immutable value 'name' was never used; consider replacing with '_' or removing itcurrentDirectory.contents.append(.directory(name: name, contents: [])) // cannot infer contextual base in reference to member 'directory'currentDirectory.contents.append(.directory(name: name, contents: [])) // value of type 'FileSystemNode' has no member 'contents'currentDirectory.contents.append(.file(name: name, size: Int(components[2])!)) // value of type 'FileSystemNode' has no member 'contents'currentDirectory.contents.append(.file(name: name, size: Int(components[2])!)) // cannot infer contextual base in reference to member 'file'case.directory(let name, let contents): // immutable value 'name' was never used; consider replacing with '_' or removing itindirect 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 let.file(name, size):
return size
case let.directory(name, contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case let.file(name, size):
return 1
case let.directory(name, contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case let.file(name, size):
return 0
case let.directory(name, contents):
return contents.map { $0.treeDepth }.max()?? 0
}
}
}
class FileSystemManager {
private var fileSystem: FileSystemNode
init(fileSystem: FileSystemNode) {
self.fileSystem = fileSystem
}
func createFileSystem(with contents: [FileSystemNode]) -> FileSystemNode {
return.directory(name: "root", contents: contents)
}
func calculateMetadata() -> FileSystemInfo {
return fileSystem
}
}```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 let.file(name, size):
return size
case let.directory(name, contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case let.file(name, size):
return 1
case let.directory(name, contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case let.file(name, size):
return 0
case let.directory(name, contents):
return contents.map { $0.treeDepth }.max()?? 0
}
}
}
// Concrete file system manager.
// Used to create file system tree and calculate metadata.
class FileSystemManager {
private var fileSystem: FileSystemNode
init(fileSystem: FileSystemNode) {
self.fileSystem = fileSystem
}
func createFileSystem(with contents: [FileSystemNode]) -> FileSystemNode {
return.directory(name: "root", contents: contents)
}
func calculateMetadata() -> FileSystemInfo {
return fileSystem
}
}
// Concrete file system manager.
// Used to create file system tree and calculate metadata.
class FileSystemManager {
private var fileSystem: FileSystemNode
init(fileSystem: FileSystemNode) {
self.fileSystem = fileSystem
}
func createFileSystem(with contents: [FileSystemNode]) -> FileSystemNode {
return.directory(name: "root", contents: contents)
}
func calculateMetadata() -> FileSystemInfo {
return fileSystem
}
}
// Concrete file system manager.
// Used to create file system tree and calculate metadata.
class FileSystemManager {
private var fileSystem: FileSystemNode
init(fileSystem: FileSystemNode) {
self.fileSystem = fileSystem
}
func createFileSystem(with contents: [FileSystemNode]) -> FileSystemNode {
return.directory(name: "root", contents: contents)
}
func calculateMetadata() -> FileSystemInfo {
return fileSystem
}
}
// Concrete file system manager.
// Used to create file system tree and calculate metadata.
class FileSystemManager {
private var fileSystem: FileSystemNode
init(fileSystem: FileSystemNode) {
self.fileSystem = fileSystem
}
func createFileSystem(with contents: [FileSystemNode]) -> FileSystemNode {
return.directory(name: "root", contents: contents)
}
func calculateMetadata() -> FileSystemInfo {
return fileSystem
}
}
// Concrete file system manager.
// Used to create file system tree and calculate metadata.
class FileSystemManager {
private var fileSystem: FileSystemNode
init(fileSystem: FileSystemNode) {
self.fileSystem = fileSystem
}
func createFileSystem(with contents: [FileSystemNode]) -> FileSystemNode {
return.directory(name: "root", contents: contents)
}
func calculateMetadata() -> FileSystemInfo {
return fileSystem
}
}
// Concrete file system manager.
// Used to create file system tree and calculate metadata.
class FileSystemManager {
private var fileSystem: FileSystemNode
init(fileSystem: FileSystemNode) {
self.fileSystem = fileSystem
}
func createFileSystem(with contents: [FileSystemNode]) -> FileSystemNode {
return.directory(name: "root", contents: contents)
}
func calculateMetadata() -> FileSystemInfo {
return fileSystem
}
}
// Concrete file system manager.
// Used to create file system tree and calculate metadata.
class FileSystemManager {
private var fileSystem: FileSystemNode
init(fileSystem: FileSystemNode) {
self.fileSystem = fileSystem
}
func createFileSystem(with contents: [FileSystemNode]) -> FileSystemNode {
return.directory(name: "root", contents: contents)
}
func calculateMetadata() -> FileSystemInfo {
return fileSystem
}
}
// Concrete file system manager.
// Used to create file system tree and calculate metadata.
class FileSystemManager {
private var fileSystem: FileSystemNode
init(fileSystem: FileSystemNode) {
self.fileSystem = fileSystem
}
func createFileSystem(with contents: [FileSystemNode]) -> FileSystemNode {
return.directory(name: "root", contents: contents)
}
func calculateMetadata() -> FileSystemInfo {
return fileSystem
}
}
// Concrete file system manager.
// Used to create file system tree and calculate metadata.
class FileSystemManager {
private var fileSystem: FileSystemNode
init(filecase let.file(name, size): // immutable value 'name' was never used; consider replacing with '_' or removing itcase let.directory(name, contents): // immutable value 'name' was never used; consider replacing with '_' or removing itcase let.file(name, size): // immutable value 'size' was never used; consider replacing with '_' or removing itcase let.file(name, size): // immutable value 'name' was never used; consider replacing with '_' or removing itcase let.directory(name, contents): // immutable value 'name' was never used; consider replacing with '_' or removing itreturn contents.map { $0.treeDepth }.max()?? 0 // consecutive statements on a line must be separated by ';'return contents.map { $0.treeDepth }.max()?? 0 // cannot use optional chaining on non-optional value of type 'Int'return contents.map { $0.treeDepth }.max()?? 0 // value of optional type 'Int?' must be unwrapped to a value of type 'Int'return contents.map { $0.treeDepth }.max()?? 0 // integer literal is unusedindirect 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 let.file(name: _, size: size):
return size
case let.directory(name: _, contents: contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case.file:
return 1
case let.directory(name: _, contents: contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case.file:
return 1
case let.directory(name: _, contents: contents):
return contents.map { $0.treeDepth }.max()?? 0
}
}
}
struct FileSystemManager {
static func createFileSystem(from data: [String]) -> FileSystemNode {
var stack = [FileSystemNode]()
for line in data {
let components = line.components(separatedBy: " ")
let name = components.last!
let size = Int(components.first!)!
let node = size == 0? FileSystemNode.directory(name: name, contents: []) : FileSystemNode.file(name: name, size: size)
if components.count == 2 {
stack.append(node)
} else {
var contents = [FileSystemNode]()
while let last = stack.popLast() {
contents.append(last)
if last.name == name {
break
}
}
stack.append(FileSystemNode.directory(name: name, contents: contents.reversed()))
}
}
return stack.last!
}
}```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 let.file(name: _, size: size):
return size
case let.directory(name: _, contents: contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case.file:
return 1
case let.directory(name: _, contents: contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case.file:
return 1
case let.directory(name: _, contents: contents):
return contents.map { $0.treeDepth }.max()?? 0
}
}
}
// Concrete file system manager.
// Used to create file system nodes.
struct FileSystemManager {
static func createFileSystem(from data: [String]) -> FileSystemNode {
var stack = [FileSystemNode]()
for line in data {
let components = line.components(separatedBy: " ")
let name = components.last!
let size = Int(components.first!)!
let node = size == 0? FileSystemNode.directory(name: name, contents: []) : FileSystemNode.file(name: name, size: size)
if components.count == 2 {
stack.append(node)
} else {
var contents = [FileSystemNode]()
while let last = stack.popLast() {
contents.append(last)
if last.name == name {
break
}
}
stack.append(FileSystemNode.directory(name: name, contents: contents.reversed()))
}
}
return stack.last!
}
}
// Test
let data = [
"4144160 1",
"8388608 2",
"8388608 3",
"4194304 4",
"4194304 5",
"4194304 6",
"4194304 7",
"4194304 8",
"4194304 9",
"4194304 10",
"4194304 11",
"4194304 12",
"4194304 13",
"4194304 14",
"4194304 15",
"4194304 16",
"4194304 17",
"4194304 18",
"4194304 19",
"4194304 20",
"4194304 21",
"4194304 22",
"4194304 23",
"4194304 24",
"4194304 25",
"4194304 26",
"4194304 27",
"4194304 28",
"4194304 29",
"4194304 30",
"4194304 31",
"4194304 32",
"4194304 33",
"4194304 34",
"4194304 35",
"4194304 36",
"4194304 37",
"4194304 38",
"4194304 39",
"4194304 40",
"4194304 41",
"4194304 42",
"4194304 43",
"4194304 44",
"4194304 45",
"4194304 46",
"4194304 47",
"4194304 48",
"4194304 49",
return contents.map { $0.treeDepth }.max()?? 0 // cannot use optional chaining on non-optional value of type 'Int'return contents.map { $0.treeDepth }.max()?? 0 // value of optional type 'Int?' must be unwrapped to a value of type 'Int'return contents.map { $0.treeDepth }.max()?? 0 // integer literal is unusedreturn contents.map { $0.treeDepth }.max()?? 0 // consecutive statements on a line must be separated by ';'let node = size == 0? FileSystemNode.directory(name: name, contents: []) : FileSystemNode.file(name: name, size: size) // result of call to function returning 'FileSystemNode' is unusedlet node = size == 0? FileSystemNode.directory(name: name, contents: []) : FileSystemNode.file(name: name, size: size) // expected expressionlet node = size == 0? FileSystemNode.directory(name: name, contents: []) : FileSystemNode.file(name: name, size: size) // consecutive statements on a line must be separated by ';'let node = size == 0? FileSystemNode.directory(name: name, contents: []) : FileSystemNode.file(name: name, size: size) // cannot use optional chaining on non-optional value of type 'Int'let node = size == 0? FileSystemNode.directory(name: name, contents: []) : FileSystemNode.file(name: name, size: size) // consecutive statements on a line must be separated by ';'if last.name == name { // value of type 'FileSystemNode' has no member 'name'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 let.file(_, size):
return size
case let.directory(_, contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case.file:
return 1
case let.directory(_, contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case.file:
return 1
case let.directory(_, contents):
return contents.map { $0.treeDepth }.max()?? 0
}
}
}
class FileSystemManager {
private let root: FileSystemNode
init(root: FileSystemNode) {
self.root = root
}
func totalSize() -> Int {
return root.totalSize
}
func filesCount() -> Int {
return root.filesCount
}
func treeDepth() -> Int {
return root.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 let.file(_, size):
return size
case let.directory(_, contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case.file:
return 1
case let.directory(_, contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case.file:
return 1
case let.directory(_, contents):
return contents.map { $0.treeDepth }.max()?? 0
}
}
}
// Concrete file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
class FileSystemManager {
private let root: FileSystemNode
init(root: FileSystemNode) {
self.root = root
}
func totalSize() -> Int {
return root.totalSize
}
func filesCount() -> Int {
return root.filesCount
}
func treeDepth() -> Int {
return root.treeDepth
}
}
// MARK: - Tests
let fileSystem = FileSystemNode.directory(name: "root", contents: [
.file(name: "file1", size: 10),
.file(name: "file2", size: 20),
.directory(name: "dir1", contents: [
.file(name: "file3", size: 30),
.file(name: "file4", size: 40),
.directory(name: "dir2", contents: [
.file(name: "file5", size: 50),
.file(name: "file6", size: 60),
.directory(name: "dir3", contents: [
.file(name: "file7", size: 70),
.file(name: "file8", size: 80),
.directory(name: "dir4", contents: [
.file(name: "file9", size: 90),
.file(name: "file10", size: 100)
])
])
])
])
])
let fileSystemManager = FileSystemManager(root: fileSystem)
print(fileSystemManager.totalSize()) // 550
print(fileSystemManager.filesCount()) // 10
print(fileSystemManager.treeDepth()) // 4
```return contents.map { $0.treeDepth }.max()?? 0 // cannot use optional chaining on non-optional value of type 'Int'return contents.map { $0.treeDepth }.max()?? 0 // value of optional type 'Int?' must be unwrapped to a value of type 'Int'return contents.map { $0.treeDepth }.max()?? 0 // integer literal is unusedreturn contents.map { $0.treeDepth }.max()?? 0 // consecutive statements on a line must be separated by ';'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 name, let size):
return size
case.directory(let name, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case.file(let name, let size):
return 1
case.directory(let name, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case.file(let name, let size):
return 1
case.directory(let name, let contents):
return contents.reduce(0) { max($0, $1.treeDepth) } + 1
}
}
}
extension FileSystemNode {
func calculateTotalSize() -> Int {
return totalSize
}
func calculateFilesCount() -> Int {
return filesCount
}
func calculateTreeDepth() -> Int {
return treeDepth
}
}
extension FileSystemNode {
func calculateTotalSize() -> Int {
var totalSize = 0
var stack = [self]
while!stack.isEmpty {
let node = stack.removeLast()
switch node {
case.file(let name, let size):
totalSize += size
case.directory(let name, let contents):
stack.append(contentsOf: contents)
}
}
return totalSize
}
func calculateFilesCount() -> Int {
var filesCount = 0
var stack = [self]
while!stack.isEmpty {
let node = stack.removeLast()
switch node {
case.file(let name, let size):
filesCount += 1
case.directory(let name, let contents):
stack.append(contentsOf: contents)
}
}
return filesCount
}
func calculateTreeDepth() -> Int {
var treeDepth = 0
var stack = [self]
while!stack.isEmpty {
let node = stack.removeLast()
switch node {
case.file(let name, let size):
treeDepth = max(treeDepth, 1)
case.directory(let name, let contents):
stack.append(contentsOf: contents)
treeDepth = max(treeDepth, contents.reduce(0) { max($0, $1.treeDepth) } + 1)
}
}
return treeDepth
}
}
extension FileSystemNode {
func calculateTotalSize() -> Int {
var totalSize = 0
var queue = [self]
while!queue.isEmpty {
let node = queue.removeFirst()
switch node {
case.file(let name, let size):
totalSize += size
case.directory(let name, let contents):
queue.append(contentsOf: contents)
}
}
return totalSize
}
func calculateFilesCount() -> Int {
var filesCount = 0
var queue = [self]
while!queue.isEmpty {
let node = queue.removeFirst()
switch node {
case.file(let name, let size):
filesCount += 1
case.directory(let name, let contents):
queue.append(contentsOf: contents)
}
}
return filesCount
}
func calculateTreeDepth() -> Int {
var treeDepth = 0
var queue = [self]
while!queue.isEmpty {
let node = queue.removeFirst()
switch node {
case.file(let name, let size):
treeDepth = max(treeDepth, 1)
case.directory(let name, let contents):
queue.append(contentsOf: contents)
treeDepth = max(treeDepth, contents.reduce(0) { max($0, $1.treeDepth) } + 1)
}
}
return 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 name, let size):
return size
case.directory(let name, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case.file(let name, let size):
return 1
case.directory(let name, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case.file(let name, let size):
return 1
case.directory(let name, let contents):
return contents.reduce(0) { max($0, $1.treeDepth) } + 1
}
}
}
// Concrete 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 {
func calculateTotalSize() -> Int {
return totalSize
}
func calculateFilesCount() -> Int {
return filesCount
}
func calculateTreeDepth() -> Int {
return treeDepth
}
}
// Concrete 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 {
func calculateTotalSize() -> Int {
var totalSize = 0
var stack = [self]
while!stack.isEmpty {
let node = stack.removeLast()
switch node {
case.file(let name, let size):
totalSize += size
case.directory(let name, let contents):
stack.append(contentsOf: contents)
}
}
return totalSize
}
func calculateFilesCount() -> Int {
var filesCount = 0
var stack = [self]
while!stack.isEmpty {
let node = stack.removeLast()
switch node {
case.file(let name, let size):
filesCount += 1
case.directory(let name, let contents):
stack.append(contentsOf: contents)
}
}
return filesCount
}
func calculateTreeDepth() -> Int {
var treeDepth = 0
var stack = [self]
while!stack.isEmpty {
let node = stack.removeLast()
switch node {
case.file(let name, let size):
treeDepth = max(treeDepth, 1)
case.directory(let name, let contents):
stack.append(contentsOf: contents)
treeDepth = max(treeDepth, contents.reduce(0) { max($0, $1.treeDepth) } + 1)
}
}
return treeDepth
}
}
// Concrete 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 {
func calculateTotalSize() -> Int {
var totalSize = 0
var queue = [self]
while!queue.isEmpty {
let node = queue.removeFirst()
switch node {
case.file(let name, let size):
totalSize += size
case.directory(let name, let contents):
queue.append(contentsOf: contents)
}
}
return totalSize
}
func calculateFilesCount() -> Int {
var filesCount = 0
var queue = [self]
while!queue.isEmpty {
let node = queue.removeFirst()
switch node {
case.file(let name, let size):
filesCount += 1
case.directory(let name, let contents):
queue.append(contentsOf: contents)
}
}
return filesCount
}
func calculateTreeDepth() -> Int {
var treeDepth = 0
var queue = [self]
while!queue.isEmpty {
let node = queue.removeFirst()
switch node {
case.file(let name, let size):
treeDepth = max(treeDepth, 1)
case.directory(let name, let contents):
queue.append(contentsOf: contents)
treeDepth = max(treeDepth, contents.reduce(0) { max($0, $1.treeDepth) } + 1)
}
}
return treeDepth
}
}
// Concrete 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 {
func calculateTotalSize() -> Int {
var totalSize = 0
var queue =case.file(let name, let size): // immutable value 'name' was never used; consider replacing with '_' or removing itcase.directory(let name, let contents): // immutable value 'name' was never used; consider replacing with '_' or removing itcase.file(let name, let size): // immutable value 'name' was never used; consider replacing with '_' or removing itcase.file(let name, let size): // immutable value 'size' was never used; consider replacing with '_' or removing itcase.directory(let name, let contents): // immutable value 'name' was never used; consider replacing with '_' or removing itcase.file(let name, let size): // immutable value 'size' was never used; consider replacing with '_' or removing itcase.file(let name, let size): // immutable value 'name' was never used; consider replacing with '_' or removing itcase.directory(let name, let contents): // immutable value 'name' was never used; consider replacing with '_' or removing itfunc calculateTotalSize() -> Int { // invalid redeclaration of 'calculateTotalSize()'while!stack.isEmpty { // expected expression, var, or let in 'while' conditionfunc calculateFilesCount() -> Int { // invalid redeclaration of 'calculateFilesCount()'while!stack.isEmpty { // expected expression, var, or let in 'while' conditionfunc calculateTreeDepth() -> Int { // invalid redeclaration of 'calculateTreeDepth()'while!stack.isEmpty { // expected expression, var, or let in 'while' conditionfunc calculateTotalSize() -> Int { // invalid redeclaration of 'calculateTotalSize()'while!queue.isEmpty { // expected expression, var, or let in 'while' conditionfunc calculateFilesCount() -> Int { // invalid redeclaration of 'calculateFilesCount()'while!queue.isEmpty { // expected expression, var, or let in 'while' conditionfunc calculateTreeDepth() -> Int { // invalid redeclaration of 'calculateTreeDepth()'while!queue.isEmpty { // expected expression, var, or let in 'while' conditionindirect 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 let.file(name: _, size: size):
return size
case let.directory(name: _, contents: contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case let.file(name: _, size: _):
return 1
case let.directory(name: _, contents: contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case let.file(name: _, size: _):
return 1
case let.directory(name: _, contents: contents):
return contents.reduce(1) { max($0, $1.treeDepth + 1) }
}
}
}
extension FileSystemNode {
mutating func createFile(name: String, size: Int) {
switch self {
case let.file(name: _, size: _):
fatalError("Can't create file in file")
case let.directory(name: _, contents: contents):
contents.append(.file(name: name, size: size))
}
}
mutating func createDirectory(name: String) {
switch self {
case let.file(name: _, size: _):
fatalError("Can't create directory in file")
case let.directory(name: _, contents: contents):
contents.append(.directory(name: name, contents: []))
}
}
}
extension FileSystemNode {
mutating func deleteFile(name: String) {
switch self {
case let.file(name: _, size: _):
fatalError("Can't delete file in file")
case let.directory(name: _, contents: contents):
contents = contents.filter {
switch $0 {
case let.file(name: name, size: _):
return name!= name
case let.directory(name: name, contents: _):
return name!= name
}
}
}
}
mutating func deleteDirectory(name: String) {
switch self {
case let.file(name: _, size: _):
fatalError("Can't delete directory in file")
case let.directory(name: _, contents: contents):
contents = contents.filter {
switch $0 {
case let.file(name: _, size: _):
return true
case let.directory(name: name, contents: _):
return name!= name
}
}
}
}
}
extension FileSystemNode {
mutating func moveFile(name: String, to directory: FileSystemNode) {
switch self {
case let.file(name: _, size: _):
fatalError("Can't move file in file")
case let.directory(name: _, contents: contents):
contents = contents.filter {
switch $0 {
case let.file(name: name, size: _):
return name!= name
case let.directory(name: _, contents: _):
return true
}
}
directory.createFile(name: name, size: 0)
}
}
mutating func moveDirectory(name: String, to directory: FileSystemNode) {
switch self {
case let.file(name: _, size: _):
fatalError("Can't move directory in file")
case let.directory(name: _, contents: contents):
contents = contents.filter {
switch $0 {
case let.file(name: _, size: _):
return true
case let.directory(name: name, contents: _):
return name!= name
}
}
directory.createDirectory(name: name)
}
}
}```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 let.file(name: _, size: size):
return size
case let.directory(name: _, contents: contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case let.file(name: _, size: _):
return 1
case let.directory(name: _, contents: contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case let.file(name: _, size: _):
return 1
case let.directory(name: _, contents: contents):
return contents.reduce(1) { max($0, $1.treeDepth + 1) }
}
}
}
// File system manager that can create new files and directories.
extension FileSystemNode {
mutating func createFile(name: String, size: Int) {
switch self {
case let.file(name: _, size: _):
fatalError("Can't create file in file")
case let.directory(name: _, contents: contents):
contents.append(.file(name: name, size: size))
}
}
mutating func createDirectory(name: String) {
switch self {
case let.file(name: _, size: _):
fatalError("Can't create directory in file")
case let.directory(name: _, contents: contents):
contents.append(.directory(name: name, contents: []))
}
}
}
// File system manager that can delete files and directories.
extension FileSystemNode {
mutating func deleteFile(name: String) {
switch self {
case let.file(name: _, size: _):
fatalError("Can't delete file in file")
case let.directory(name: _, contents: contents):
contents = contents.filter {
switch $0 {
case let.file(name: name, size: _):
return name!= name
case let.directory(name: name, contents: _):
return name!= name
}
}
}
}
mutating func deleteDirectory(name: String) {
switch self {
case let.file(name: _, size: _):
fatalError("Can't delete directory in file")
case let.directory(name: _, contents: contents):
contents = contents.filter {
switch $0 {
case let.file(name: _, size: _):
return true
case let.directory(name: name, contents: _):
return name!= name
}
}
}
}
}
// File system manager that can move files and directories.
extension FileSystemNode {
mutating func moveFile(name: String, to directory: FileSystemNode) {
switch self {
case let.file(name: _, size: _):
fatalError("Can't move file in file")
case let.directory(name: _, contents: contents):
contents = contents.filter {
switch $0 {
case let.file(name: name, size: _):
return name!= name
case let.directory(name: _, contents: _):
return true
}
}
directory.createFile(name: name, size: 0)
}
}
mutating func moveDirectory(name: String, to directory: FileSystemNode) {
switch self {
case let.file(name: _, size: _):
fatalError("Can't move directory in file")
case let.directory(name: _, contents: contents):
contents = contents.filter {
switch $0 {
case let.file(name: _, size: _):
return true
case let.directory(name: name, contents: _):
return name!= name
}
}
directory.createDirectory(name: name)
}
}
}
// File system manager that can copy files and directories.
extension FileSystemNode {
mutating func copyFile(name: String, to directory: FileSystemNode) {
switch self {
case let.file(name: _, size: _):
fatalError("Can't copy file in file")
case let.directory(name: _, contents: contents):
contents = contents.filter {
switch $0 {
case let.file(name: name, size: _):
return name!= name
case let.directory(name: _, contents: _):
return true
}
}
directory.createFile(name: name, size: 0)
}
}
case let.file(name: _, size: _): // 'let' pattern has no effect; sub-pattern didn't bind any variablescase let.file(name: _, size: _): // 'let' pattern has no effect; sub-pattern didn't bind any variablescase let.file(name: _, size: _): // 'let' pattern has no effect; sub-pattern didn't bind any variablescontents.append(.file(name: name, size: size)) // cannot use mutating member on immutable value: 'contents' is immutablecase let.file(name: _, size: _): // 'let' pattern has no effect; sub-pattern didn't bind any variablescontents.append(.directory(name: name, contents: [])) // cannot use mutating member on immutable value: 'contents' is immutablecase let.file(name: _, size: _): // 'let' pattern has no effect; sub-pattern didn't bind any variablescontents = contents.filter { // cannot assign to value: 'contents' is immutablereturn name!= name // '=' must have consistent whitespace on both sidesreturn name!= name // cannot force unwrap value of non-optional type 'String'return name!= name // use of '=' in a boolean context, did you mean '=='?return name!= name // '=' must have consistent whitespace on both sidescase let.file(name: _, size: _): // 'let' pattern has no effect; sub-pattern didn't bind any variablescontents = contents.filter { // cannot assign to value: 'contents' is immutablecase let.file(name: _, size: _): // 'let' pattern has no effect; sub-pattern didn't bind any variablesreturn name!= name // cannot force unwrap value of non-optional type 'String'return name!= name // '=' must have consistent whitespace on both sidesreturn name!= name // use of '=' in a boolean context, did you mean '=='?case let.file(name: _, size: _): // 'let' pattern has no effect; sub-pattern didn't bind any variablescontents = contents.filter { // cannot assign to value: 'contents' is immutablereturn name!= name // use of '=' in a boolean context, did you mean '=='?return name!= name // '=' must have consistent whitespace on both sidesreturn name!= name // cannot force unwrap value of non-optional type 'String'directory.createFile(name: name, size: 0) // cannot use mutating member on immutable value: 'directory' is a 'let' constantcase let.file(name: _, size: _): // 'let' pattern has no effect; sub-pattern didn't bind any variablescontents = contents.filter { // cannot assign to value: 'contents' is immutablecase let.file(name: _, size: _): // 'let' pattern has no effect; sub-pattern didn't bind any variablesreturn name!= name // '=' must have consistent whitespace on both sidesreturn name!= name // use of '=' in a boolean context, did you mean '=='?return name!= name // cannot force unwrap value of non-optional type 'String'directory.createDirectory(name: name) // cannot use mutating member on immutable value: 'directory' is a 'let' constantindirect 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 let.file(name: _, size: size):
return size
case let.directory(name: _, contents: contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case.file:
return 1
case let.directory(name: _, contents: contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case.file:
return 1
case let.directory(name: _, contents: contents):
return contents.reduce(1) { 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 let.file(name: _, size: size):
return size
case let.directory(name: _, contents: contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case.file:
return 1
case let.directory(name: _, contents: contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case.file:
return 1
case let.directory(name: _, contents: contents):
return contents.reduce(1) { max($0, $1.treeDepth) }
}
}
}
// Concrete 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 let.file(name: _, size: size):
return size
case let.directory(name: _, contents: contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case.file:
return 1
case let.directory(name: _, contents: contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case.file:
return 1
case let.directory(name: _, contents: contents):
return contents.reduce(1) { max($0, $1.treeDepth) }
}
}
}
``` // XCTAssertEqual failed: (1) 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 name, let size):
return size
case.directory(let name, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case.file(let name, let size):
return 1
case.directory(let name, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case.file(let name, let size):
return 1
case.directory(let name, let contents):
return contents.reduce(1) { 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 name, let size):
return size
case.directory(let name, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case.file(let name, let size):
return 1
case.directory(let name, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case.file(let name, let size):
return 1
case.directory(let name, let contents):
return contents.reduce(1) { max($0, $1.treeDepth) }
}
}
}
// Concrete 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 name, let size):
return size
case.directory(let name, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case.file(let name, let size):
return 1
case.directory(let name, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case.file(let name, let size):
return 1
case.directory(let name, let contents):
return contents.reduce(1) { max($0, $1.treeDepth) }
}
}
}
```case.file(let name, let size): // immutable value 'name' was never used; consider replacing with '_' or removing itcase.directory(let name, let contents): // immutable value 'name' was never used; consider replacing with '_' or removing itcase.file(let name, let size): // immutable value 'size' was never used; consider replacing with '_' or removing itcase.file(let name, let size): // immutable value 'name' was never used; consider replacing with '_' or removing itcase.directory(let name, let contents): // immutable value 'name' was never used; consider replacing with '_' or removing itcase.file(let name, let size): // immutable value 'size' was never used; consider replacing with '_' or removing itcase.file(let name, let size): // immutable value 'name' was never used; consider replacing with '_' or removing itcase.directory(let name, let contents): // immutable value 'name' was never used; consider replacing with '_' or removing it // XCTAssertEqual failed: (1) 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 name, let size):
return size
case.directory(let name, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case.file(let name, let size):
return 1
case.directory(let name, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case.file(let name, let size):
return 1
case.directory(let name, let contents):
return contents.reduce(1) { 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 name, let size):
return size
case.directory(let name, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case.file(let name, let size):
return 1
case.directory(let name, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case.file(let name, let size):
return 1
case.directory(let name, let contents):
return contents.reduce(1) { max($0, $1.treeDepth) }
}
}
}
// Concrete 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 name, let size):
return size
case.directory(let name, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case.file(let name, let size):
return 1
case.directory(let name, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case.file(let name, let size):
return 1
case.directory(let name, let contents):
return contents.reduce(1) { max($0, $1.treeDepth) }
}
}
}
```case.file(let name, let size): // immutable value 'name' was never used; consider replacing with '_' or removing itcase.directory(let name, let contents): // immutable value 'name' was never used; consider replacing with '_' or removing itcase.file(let name, let size): // immutable value 'size' was never used; consider replacing with '_' or removing itcase.file(let name, let size): // immutable value 'name' was never used; consider replacing with '_' or removing itcase.directory(let name, let contents): // immutable value 'name' was never used; consider replacing with '_' or removing itcase.file(let name, let size): // immutable value 'size' was never used; consider replacing with '_' or removing itcase.file(let name, let size): // immutable value 'name' was never used; consider replacing with '_' or removing itcase.directory(let name, let contents): // immutable value 'name' was never used; consider replacing with '_' or removing it // XCTAssertEqual failed: (1) is not equal to (4)protocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
class Stack<Element>: StackProtocol {
var items = [Element]()
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
class IntStack: StackProtocol {
typealias Element = Int
var items = [Int]()
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<Element>: StackProtocol {
var items = [Element]()
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
// Stack with push and pop functions that only accept integers.
class IntStack: StackProtocol {
typealias Element = Int
var items = [Int]()
func push(_ element: Int) {
items.append(element)
}
func pop() -> Int? {
return items.popLast()
}
}
```class Stack<Element>: StackProtocol { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack<Element>'class IntStack: StackProtocol { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'IntStack'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<Element>: StackProtocol {
var items = [Element]()
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
class IntStack: StackProtocol {
var items = [Int]()
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<Element>: StackProtocol {
var items = [Element]()
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
// Stack with push and pop functions.
class IntStack: StackProtocol {
var items = [Int]()
func push(_ element: Int) {
items.append(element)
}
func pop() -> Int? {
return items.popLast()
}
}
```class Stack<Element>: StackProtocol { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack<Element>'class IntStack: StackProtocol { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'IntStack'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<Element>: StackProtocol {
var items: [Element] = []
required init() {}
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
class LimitedStack<Element>: Stack<Element> {
let capacity: Int
init(capacity: Int) {
self.capacity = capacity
super.init()
}
override func push(_ element: Element) {
if items.count < capacity {
super.push(element)
}
}
}
class DefaultStack<Element>: LimitedStack<Element> {
let defaultValue: Element
init(capacity: Int, defaultValue: Element) {
self.defaultValue = defaultValue
super.init(capacity: capacity)
}
override func pop() -> Element? {
return super.pop()?? defaultValue
}
}```swift
protocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
var items: [Element] = []
required init() {}
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
// Stack with a maximum capacity.
class LimitedStack<Element>: Stack<Element> {
let capacity: Int
init(capacity: Int) {
self.capacity = capacity
super.init()
}
override func push(_ element: Element) {
if items.count < capacity {
super.push(element)
}
}
}
// Stack with a maximum capacity and a default value.
class DefaultStack<Element>: LimitedStack<Element> {
let defaultValue: Element
init(capacity: Int, defaultValue: Element) {
self.defaultValue = defaultValue
super.init(capacity: capacity)
}
override func pop() -> Element? {
return super.pop()?? defaultValue
}
}
// Stack with a maximum capacity and a default value.
class DefaultStack<Element>: LimitedStack<Element> {
let defaultValue: Element
init(capacity: Int, defaultValue: Element) {
self.defaultValue = defaultValue
super.init(capacity: capacity)
}
override func pop() -> Element? {
return super.pop()?? defaultValue
}
}
```override func push(_ element: Element) { // 'required' initializer 'init()' must be provided by subclass of 'Stack<Element>'return super.pop()?? defaultValue // cannot use optional chaining on non-optional value of type 'Element'return super.pop()?? defaultValue // expression of type 'Element' is unusedreturn super.pop()?? defaultValue // consecutive statements on a line must be separated by ';'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<Element>: StackProtocol {
private var storage: [Element] = []
func push(_ element: Element) {
storage.append(element)
}
func pop() -> Element? {
return storage.popLast()
}
}
class IntStack: Stack<Int> {
// Add some specific functions.
}```swift
protocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
private var storage: [Element] = []
func push(_ element: Element) {
storage.append(element)
}
func pop() -> Element? {
return storage.popLast()
}
}
// Stack with a specific type of element.
class IntStack: Stack<Int> {
// Add some specific functions.
}
```class Stack<Element>: StackProtocol { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack<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<Element>: StackProtocol {
var items = [Element]()
required init() {}
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
class IntStack: StackProtocol {
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<Element>: StackProtocol {
var items = [Element]()
required init() {}
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
// Stack with push and pop functions.
class IntStack: StackProtocol {
var items = [Int]()
required init() {}
func push(_ element: Int) {
items.append(element)
}
func pop() -> Int? {
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<Element>: StackProtocol {
var items: [Element] = []
required init() {}
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
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<Element>: StackProtocol {
var items: [Element] = []
required init() {}
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
var items: [Element] = []
required init() {}
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
var items: [Element] = []
required init() {}
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
var items: [Element] = []
required init() {}
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
var items: [Element] = []
required init() {}
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
var items: [Element] = []
required init() {}
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
var items: [Element] = []
required init() {}
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
var items: [Element] = []
required init() {}
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
var items: [Element] = []
required init() {}
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
var items: [Element] = []
required init() {}
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
var items: [Element] = []
required init() {}
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
var items: [Element] = []
required init() {}
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
var items: [Element] = []
required init() {}
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
var items: [Element] = []
required init() {}
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
var items: [Element] = []
required init() {}
func push(_ element: Element) {
itemsvar 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<Element>: StackProtocol {
var items: [Element] = []
required init() {}
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
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<Element>: StackProtocol {
var items: [Element] = []
required init() {}
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
// Stack with push and pop functions that can only store integers.
class IntStack: Stack<Int> {}
// Stack with push and pop functions that can only store strings.
class StringStack: Stack<String> {}
```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<Element>: StackProtocol {
var items: [Element] = []
required init() {}
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
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<Element>: StackProtocol {
var items: [Element] = []
required init() {}
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
// Stack with a generic element type.
var stackOfStrings = Stack<String>()
stackOfStrings.push("uno")
stackOfStrings.push("dos")
stackOfStrings.push("tres")
stackOfStrings.push("cuatro")
// the stack now contains 4 strings
// Stack with a non-generic element type.
var stackOfInts = Stack<Int>()
stackOfInts.push(1)
stackOfInts.push(2)
stackOfInts.push(3)
stackOfInts.push(4)
// the stack now contains 4 integers
```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<Element>: StackProtocol {
private var elements: [Element] = []
required init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class IntStack: StackProtocol {
typealias Element = Int
private var elements: [Int] = []
required init() {}
func push(_ element: Int) {
elements.append(element)
}
func pop() -> Int? {
return elements.popLast()
}
}```swift
protocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
private var elements: [Element] = []
required init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Stack with push and pop functions that only accepts integers.
class IntStack: StackProtocol {
typealias Element = Int
private var elements: [Int] = []
required init() {}
func push(_ element: Int) {
elements.append(element)
}
func pop() -> Int? {
return elements.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<Element>: StackProtocol {
var items = [Element]()
required init() {}
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
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<Element>: StackProtocol {
var items = [Element]()
required init() {}
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
// Stack with a String element type.
class StringStack: Stack<String> {}
// Stack with a Int element type.
class IntStack: Stack<Int> {}
// Stack with a Double element type.
class DoubleStack: Stack<Double> {}
```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 cache: [Key: Element] = [:]
private var keys: [Key] = []
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
}
subscript(key: Key) -> Element? {
get {
return cache[key]
}
set {
if let value = newValue {
if let index = keys.firstIndex(of: key) {
keys.remove(at: index)
}
keys.append(key)
cache[key] = value
if keys.count > capacity {
let keyToRemove = keys.removeFirst()
cache[keyToRemove] = nil
}
} else {
cache[key] = nil
if let index = keys.firstIndex(of: key) {
keys.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 keys: [Key] = []
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
}
subscript(key: Key) -> Element? {
get {
return cache[key]
}
set {
if let value = newValue {
if let index = keys.firstIndex(of: key) {
keys.remove(at: index)
}
keys.append(key)
cache[key] = value
if keys.count > capacity {
let keyToRemove = keys.removeFirst()
cache[keyToRemove] = nil
}
} else {
cache[key] = nil
if let index = keys.firstIndex(of: key) {
keys.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 cache: [Key: Element]
private var keys: [Key]
private var capacity: Int
init(capacity: Int) {
self.capacity = capacity
self.cache = [Key: Element]()
self.keys = [Key]()
}
subscript(key: Key) -> Element? {
get {
if let index = keys.firstIndex(of: key) {
keys.remove(at: index)
keys.append(key)
}
return cache[key]
}
set {
if let index = keys.firstIndex(of: key) {
keys.remove(at: index)
}
if cache.count >= capacity {
cache.removeValue(forKey: keys.removeFirst())
}
keys.append(key)
cache[key] = newValue
}
}
}```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 keys: [Key]
private var capacity: Int
init(capacity: Int) {
self.capacity = capacity
self.cache = [Key: Element]()
self.keys = [Key]()
}
subscript(key: Key) -> Element? {
get {
if let index = keys.firstIndex(of: key) {
keys.remove(at: index)
keys.append(key)
}
return cache[key]
}
set {
if let index = keys.firstIndex(of: key) {
keys.remove(at: index)
}
if cache.count >= capacity {
cache.removeValue(forKey: keys.removeFirst())
}
keys.append(key)
cache[key] = newValue
}
}
}
```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, Value>: CacheProtocol {
private var cache: [Key: Value] = [:]
private var keys: [Key] = []
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
}
subscript(key: Key) -> Value? {
get {
return cache[key]
}
set {
if let value = newValue {
cache[key] = value
keys.append(key)
if keys.count > capacity {
let keyToRemove = keys.removeFirst()
cache.removeValue(forKey: keyToRemove)
}
} else {
cache.removeValue(forKey: key)
keys.removeAll { $0 == 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, Value>: CacheProtocol {
private var cache: [Key: Value] = [:]
private var keys: [Key] = []
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
}
subscript(key: Key) -> Value? {
get {
return cache[key]
}
set {
if let value = newValue {
cache[key] = value
keys.append(key)
if keys.count > capacity {
let keyToRemove = keys.removeFirst()
cache.removeValue(forKey: keyToRemove)
}
} else {
cache.removeValue(forKey: key)
keys.removeAll { $0 == key }
}
}
}
}
```init(capacity: Int) { // initializer requirement 'init(capacity:)' can only be satisfied by a 'required' initializer in non-final class 'Cache<Key, Value>'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 keys: [Key]
private let capacity: Int
init(capacity: Int) {
self.cache = [:]
self.keys = []
self.capacity = capacity
}
subscript(key: Key) -> Element? {
get {
return cache[key]
}
set {
if let value = newValue {
if cache[key] == nil {
if keys.count == capacity {
let keyToRemove = keys.removeFirst()
cache.removeValue(forKey: keyToRemove)
}
keys.append(key)
}
cache[key] = value
} else {
cache.removeValue(forKey: key)
keys = keys.filter { $0!= 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 keys: [Key]
private let capacity: Int
init(capacity: Int) {
self.cache = [:]
self.keys = []
self.capacity = capacity
}
subscript(key: Key) -> Element? {
get {
return cache[key]
}
set {
if let value = newValue {
if cache[key] == nil {
if keys.count == capacity {
let keyToRemove = keys.removeFirst()
cache.removeValue(forKey: keyToRemove)
}
keys.append(key)
}
cache[key] = value
} else {
cache.removeValue(forKey: key)
keys = keys.filter { $0!= key }
}
}
}
}
```init(capacity: Int) { // initializer requirement 'init(capacity:)' can only be satisfied by a 'required' initializer in non-final class 'Cache<Key, Element>'keys = keys.filter { $0!= key } // '=' must have consistent whitespace on both sideskeys = keys.filter { $0!= key } // cannot force unwrap value of non-optional type 'Key'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 keys: [Key]
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
self.cache = [Key: Element]()
self.keys = [Key]()
}
subscript(key: Key) -> Element? {
get {
if let index = keys.firstIndex(of: key) {
keys.remove(at: index)
keys.append(key)
}
return cache[key]
}
set {
if let index = keys.firstIndex(of: key) {
keys.remove(at: index)
}
if cache.count >= capacity {
if let keyToRemove = keys.first {
cache.removeValue(forKey: keyToRemove)
keys.removeFirst()
}
}
keys.append(key)
cache[key] = newValue
}
}
}```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 keys: [Key]
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
self.cache = [Key: Element]()
self.keys = [Key]()
}
subscript(key: Key) -> Element? {
get {
if let index = keys.firstIndex(of: key) {
keys.remove(at: index)
keys.append(key)
}
return cache[key]
}
set {
if let index = keys.firstIndex(of: key) {
keys.remove(at: index)
}
if cache.count >= capacity {
if let keyToRemove = keys.first {
cache.removeValue(forKey: keyToRemove)
keys.removeFirst()
}
}
keys.append(key)
cache[key] = newValue
}
}
}
```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 keys: [Key] = []
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
}
subscript(key: Key) -> Element? {
get {
return cache[key]
}
set {
if let value = newValue {
if cache[key] == nil {
if keys.count == capacity {
let keyToRemove = keys.removeFirst()
cache.removeValue(forKey: keyToRemove)
}
keys.append(key)
}
cache[key] = value
} else {
cache.removeValue(forKey: key)
keys = keys.filter { $0!= 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 keys: [Key] = []
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
}
subscript(key: Key) -> Element? {
get {
return cache[key]
}
set {
if let value = newValue {
if cache[key] == nil {
if keys.count == capacity {
let keyToRemove = keys.removeFirst()
cache.removeValue(forKey: keyToRemove)
}
keys.append(key)
}
cache[key] = value
} else {
cache.removeValue(forKey: key)
keys = keys.filter { $0!= key }
}
}
}
}
```init(capacity: Int) { // initializer requirement 'init(capacity:)' can only be satisfied by a 'required' initializer in non-final class 'Cache<Key, Element>'keys = keys.filter { $0!= key } // cannot force unwrap value of non-optional type 'Key'keys = keys.filter { $0!= key } // '=' must have consistent whitespace on both sidesprotocol 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 keys: [Key]
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
self.cache = [:]
self.keys = []
}
subscript(key: Key) -> Element? {
get {
if let index = keys.firstIndex(of: key) {
keys.remove(at: index)
keys.append(key)
}
return cache[key]
}
set {
if let index = keys.firstIndex(of: key) {
keys.remove(at: index)
}
if cache.count >= capacity {
let keyToRemove = keys.removeFirst()
cache.removeValue(forKey: keyToRemove)
}
keys.append(key)
cache[key] = newValue
}
}
}```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 keys: [Key]
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
self.cache = [:]
self.keys = []
}
subscript(key: Key) -> Element? {
get {
if let index = keys.firstIndex(of: key) {
keys.remove(at: index)
keys.append(key)
}
return cache[key]
}
set {
if let index = keys.firstIndex(of: key) {
keys.remove(at: index)
}
if cache.count >= capacity {
let keyToRemove = keys.removeFirst()
cache.removeValue(forKey: keyToRemove)
}
keys.append(key)
cache[key] = newValue
}
}
}
```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 keys: [Key]
private let capacity: Int
init(capacity: Int) {
self.cache = [:]
self.keys = []
self.capacity = capacity
}
subscript(key: Key) -> Element? {
get {
return cache[key]
}
set {
if let value = newValue {
if cache[key] == nil {
if keys.count == capacity {
let leastRecentlyUsedKey = keys.removeFirst()
cache.removeValue(forKey: leastRecentlyUsedKey)
}
keys.append(key)
}
cache[key] = value
} else {
if let index = keys.firstIndex(of: key) {
keys.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 keys: [Key]
private let capacity: Int
init(capacity: Int) {
self.cache = [:]
self.keys = []
self.capacity = capacity
}
subscript(key: Key) -> Element? {
get {
return cache[key]
}
set {
if let value = newValue {
if cache[key] == nil {
if keys.count == capacity {
let leastRecentlyUsedKey = keys.removeFirst()
cache.removeValue(forKey: leastRecentlyUsedKey)
}
keys.append(key)
}
cache[key] = value
} else {
if let index = keys.firstIndex(of: key) {
keys.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 keys: [Key] = []
private var capacity: Int
init(capacity: Int) {
self.capacity = capacity
}
subscript(key: Key) -> Element? {
get {
if let index = keys.firstIndex(of: key) {
keys.remove(at: index)
keys.append(key)
}
return cache[key]
}
set {
if let index = keys.firstIndex(of: key) {
keys.remove(at: index)
}
keys.append(key)
cache[key] = newValue
if keys.count > capacity {
cache.removeValue(forKey: keys.removeFirst())
}
}
}
}```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 keys: [Key] = []
private var capacity: Int
init(capacity: Int) {
self.capacity = capacity
}
subscript(key: Key) -> Element? {
get {
if let index = keys.firstIndex(of: key) {
keys.remove(at: index)
keys.append(key)
}
return cache[key]
}
set {
if let index = keys.firstIndex(of: key) {
keys.remove(at: index)
}
keys.append(key)
cache[key] = newValue
if keys.count > capacity {
cache.removeValue(forKey: keys.removeFirst())
}
}
}
}
```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 keys: [Key]
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
self.cache = [:]
self.keys = []
}
subscript(key: Key) -> Element? {
get {
return cache[key]
}
set {
if let value = newValue {
if cache[key] == nil {
if keys.count == capacity {
let keyToRemove = keys.removeFirst()
cache.removeValue(forKey: keyToRemove)
}
keys.append(key)
}
cache[key] = value
} else {
cache.removeValue(forKey: key)
keys.removeAll(where: { $0 == 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 keys: [Key]
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
self.cache = [:]
self.keys = []
}
subscript(key: Key) -> Element? {
get {
return cache[key]
}
set {
if let value = newValue {
if cache[key] == nil {
if keys.count == capacity {
let keyToRemove = keys.removeFirst()
cache.removeValue(forKey: keyToRemove)
}
keys.append(key)
}
cache[key] = value
} else {
cache.removeValue(forKey: key)
keys.removeAll(where: { $0 == key })
}
}
}
}
```init(capacity: Int) { // initializer requirement 'init(capacity:)' can only be satisfied by a 'required' initializer in non-final class 'Cache<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] = [:]
private var expirationDates: [Key: Date] = [:]
private var expirationTimer: Timer?
private let queue = DispatchQueue(label: "com.cache.queue")
init(expiration: TimeInterval) {
expirationTimer = Timer.scheduledTimer(withTimeInterval: expiration, repeats: true) { [weak self] _ in
guard let self = self else { return }
self.queue.async {
self.evictExpired()
}
}
}
func put(value: Value, key: Key, expiration: TimeInterval) {
queue.async {
self.cache[key] = value
self.expirationDates[key] = Date().addingTimeInterval(expiration)
}
}
func get(key: Key) -> Value? {
queue.sync {
if let expirationDate = expirationDates[key], expirationDate > Date() {
return cache[key]
} else {
return nil
}
}
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
guard let value = newValue else {
return
}
put(value: value, key: key, expiration: 10)
}
}
private func evictExpired() {
let expiredKeys = expirationDates.filter { $0.value < Date() }.map { $0.key }
for key in expiredKeys {
cache[key] = nil
expirationDates[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 cache: [Key: Value] = [:]
private var expirationDates: [Key: Date] = [:]
private var expirationTimer: Timer?
private let queue = DispatchQueue(label: "com.cache.queue")
init(expiration: TimeInterval) {
expirationTimer = Timer.scheduledTimer(withTimeInterval: expiration, repeats: true) { [weak self] _ in
guard let self = self else { return }
self.queue.async {
self.evictExpired()
}
}
}
func put(value: Value, key: Key, expiration: TimeInterval) {
queue.async {
self.cache[key] = value
self.expirationDates[key] = Date().addingTimeInterval(expiration)
}
}
func get(key: Key) -> Value? {
queue.sync {
if let expirationDate = expirationDates[key], expirationDate > Date() {
return cache[key]
} else {
return nil
}
}
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
guard let value = newValue else {
return
}
put(value: value, key: key, expiration: 10)
}
}
private func evictExpired() {
let expiredKeys = expirationDates.filter { $0.value < Date() }.map { $0.key }
for key in expiredKeys {
cache[key] = nil
expirationDates[key] = nil
}
}
}
```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]()
private var expirationDates = [Key: Date]()
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
put(value: newValue, key: key, expiration: 0)
}
}
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = value
expirationDates[key] = Date().addingTimeInterval(expiration)
}
func get(key: Key) -> Value? {
guard let expirationDate = expirationDates[key] else {
return nil
}
if expirationDate < Date() {
remove(key: key)
return nil
}
return cache[key]
}
private func remove(key: Key) {
cache.removeValue(forKey: key)
expirationDates.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]()
private var expirationDates = [Key: Date]()
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
put(value: newValue, key: key, expiration: 0)
}
}
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = value
expirationDates[key] = Date().addingTimeInterval(expiration)
}
func get(key: Key) -> Value? {
guard let expirationDate = expirationDates[key] else {
return nil
}
if expirationDate < Date() {
remove(key: key)
return nil
}
return cache[key]
}
private func remove(key: Key) {
cache.removeValue(forKey: key)
expirationDates.removeValue(forKey: key)
}
}
```put(value: newValue, key: key, expiration: 0) // value of optional type 'Value?' must be unwrapped to a value of 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]
private var expiration: [Key: Date]
init() {
self.cache = [:]
self.expiration = [:]
}
func put(value: Value, key: Key, expiration: TimeInterval) {
self.cache[key] = value
self.expiration[key] = Date().addingTimeInterval(expiration)
}
func get(key: Key) -> Value? {
guard let expiration = self.expiration[key], expiration > Date() else {
return nil
}
return self.cache[key]
}
subscript(key: Key) -> Value? {
get {
return self.get(key: key)
}
set {
guard let value = newValue else {
self.cache[key] = nil
self.expiration[key] = nil
return
}
self.put(value: value, key: key, expiration: 60)
}
}
}```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]
private var expiration: [Key: Date]
init() {
self.cache = [:]
self.expiration = [:]
}
func put(value: Value, key: Key, expiration: TimeInterval) {
self.cache[key] = value
self.expiration[key] = Date().addingTimeInterval(expiration)
}
func get(key: Key) -> Value? {
guard let expiration = self.expiration[key], expiration > Date() else {
return nil
}
return self.cache[key]
}
subscript(key: Key) -> Value? {
get {
return self.get(key: key)
}
set {
guard let value = newValue else {
self.cache[key] = nil
self.expiration[key] = nil
return
}
self.put(value: value, key: key, expiration: 60)
}
}
}
```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]()
private var expirationDates = [Key: Date]()
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = value
expirationDates[key] = Date().addingTimeInterval(expiration)
}
func get(key: Key) -> Value? {
guard let expirationDate = expirationDates[key] else {
return nil
}
if expirationDate < Date() {
return nil
}
return cache[key]
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
guard let value = newValue else {
cache[key] = nil
expirationDates[key] = nil
return
}
put(value: value, key: key, expiration: 10)
}
}
}```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]()
private var expirationDates = [Key: Date]()
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = value
expirationDates[key] = Date().addingTimeInterval(expiration)
}
func get(key: Key) -> Value? {
guard let expirationDate = expirationDates[key] else {
return nil
}
if expirationDate < Date() {
return nil
}
return cache[key]
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
guard let value = newValue else {
cache[key] = nil
expirationDates[key] = nil
return
}
put(value: value, key: key, expiration: 10)
}
}
}
```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] = [:]
private var expirationDates: [Key: Date] = [:]
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = value
expirationDates[key] = Date().addingTimeInterval(expiration)
}
func get(key: Key) -> Value? {
guard let expirationDate = expirationDates[key] else {
return nil
}
if expirationDate < Date() {
cache[key] = nil
expirationDates[key] = nil
return nil
}
return cache[key]
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
guard let value = newValue else {
cache[key] = nil
expirationDates[key] = nil
return
}
put(value: value, key: key, expiration: 10)
}
}
}```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] = [:]
private var expirationDates: [Key: Date] = [:]
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = value
expirationDates[key] = Date().addingTimeInterval(expiration)
}
func get(key: Key) -> Value? {
guard let expirationDate = expirationDates[key] else {
return nil
}
if expirationDate < Date() {
cache[key] = nil
expirationDates[key] = nil
return nil
}
return cache[key]
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
guard let value = newValue else {
cache[key] = nil
expirationDates[key] = nil
return
}
put(value: value, key: key, expiration: 10)
}
}
}
// Usage
let cache = ExpirableCache<String, String>()
cache["key"] = "value"
cache["key"] // "value"
cache["key"] = nil
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 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] = [:]
private var expirationDates: [Key: Date] = [:]
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = value
expirationDates[key] = Date().addingTimeInterval(expiration)
}
func get(key: Key) -> Value? {
guard let expirationDate = expirationDates[key],
expirationDate > Date() else {
return nil
}
return cache[key]
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
guard let value = newValue else {
return
}
put(value: value, key: key, expiration: 10)
}
}
}```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] = [:]
private var expirationDates: [Key: Date] = [:]
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = value
expirationDates[key] = Date().addingTimeInterval(expiration)
}
func get(key: Key) -> Value? {
guard let expirationDate = expirationDates[key],
expirationDate > Date() else {
return nil
}
return cache[key]
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
guard let value = newValue else {
return
}
put(value: value, key: key, expiration: 10)
}
}
}
```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]
private var expiration: [Key: Date]
init() {
self.cache = [:]
self.expiration = [:]
}
func put(value: Value, key: Key, expiration: TimeInterval) {
self.cache[key] = value
self.expiration[key] = Date(timeIntervalSinceNow: expiration)
}
func get(key: Key) -> Value? {
guard let expirationDate = expiration[key] else {
return nil
}
if expirationDate < Date() {
return nil
}
return cache[key]
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
guard let value = newValue else {
return
}
put(value: value, key: key, expiration: 10)
}
}
}```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]
private var expiration: [Key: Date]
init() {
self.cache = [:]
self.expiration = [:]
}
func put(value: Value, key: Key, expiration: TimeInterval) {
self.cache[key] = value
self.expiration[key] = Date(timeIntervalSinceNow: expiration)
}
func get(key: Key) -> Value? {
guard let expirationDate = expiration[key] else {
return nil
}
if expirationDate < Date() {
return nil
}
return cache[key]
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
guard let value = newValue else {
return
}
put(value: value, key: key, expiration: 10)
}
}
}
```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]
private var expirationDates: [Key: Date]
init() {
cache = [:]
expirationDates = [:]
}
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = value
expirationDates[key] = Date().addingTimeInterval(expiration)
}
func get(key: Key) -> Value? {
guard let expirationDate = expirationDates[key] else {
return nil
}
if expirationDate < Date() {
cache[key] = nil
expirationDates[key] = nil
return nil
}
return cache[key]
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
guard let value = newValue else {
return
}
put(value: value, key: key, expiration: 10)
}
}
}```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]
private var expirationDates: [Key: Date]
init() {
cache = [:]
expirationDates = [:]
}
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = value
expirationDates[key] = Date().addingTimeInterval(expiration)
}
func get(key: Key) -> Value? {
guard let expirationDate = expirationDates[key] else {
return nil
}
if expirationDate < Date() {
cache[key] = nil
expirationDates[key] = nil
return nil
}
return cache[key]
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
guard let value = newValue else {
return
}
put(value: value, key: key, expiration: 10)
}
}
}
// Usage
let cache = ExpirableCache<String, String>()
cache["key"] = "value"
cache["key"] // "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]()
private var expirationDates = [Key: Date]()
private let queue = DispatchQueue(label: "com.cache.queue")
func put(value: Value, key: Key, expiration: TimeInterval) {
queue.sync {
cache[key] = value
expirationDates[key] = Date().addingTimeInterval(expiration)
}
}
func get(key: Key) -> Value? {
queue.sync {
guard let expirationDate = expirationDates[key],
expirationDate > Date() else {
return nil
}
return cache[key]
}
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
guard let value = newValue else {
return
}
put(value: value, key: key, expiration: 10)
}
}
}```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]()
private var expirationDates = [Key: Date]()
private let queue = DispatchQueue(label: "com.cache.queue")
func put(value: Value, key: Key, expiration: TimeInterval) {
queue.sync {
cache[key] = value
expirationDates[key] = Date().addingTimeInterval(expiration)
}
}
func get(key: Key) -> Value? {
queue.sync {
guard let expirationDate = expirationDates[key],
expirationDate > Date() else {
return nil
}
return cache[key]
}
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
guard let value = newValue else {
return
}
put(value: value, key: key, expiration: 10)
}
}
}
```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]
private var expirationDates: [Key: Date]
init() {
cache = [:]
expirationDates = [:]
}
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = value
expirationDates[key] = Date().addingTimeInterval(expiration)
}
func get(key: Key) -> Value? {
guard let expirationDate = expirationDates[key] else {
return nil
}
if expirationDate.timeIntervalSinceNow > 0 {
return cache[key]
} else {
cache[key] = nil
expirationDates[key] = nil
return nil
}
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
guard let value = newValue else {
return
}
put(value: value, key: key, expiration: 10)
}
}
}```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]
private var expirationDates: [Key: Date]
init() {
cache = [:]
expirationDates = [:]
}
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = value
expirationDates[key] = Date().addingTimeInterval(expiration)
}
func get(key: Key) -> Value? {
guard let expirationDate = expirationDates[key] else {
return nil
}
if expirationDate.timeIntervalSinceNow > 0 {
return cache[key]
} else {
cache[key] = nil
expirationDates[key] = nil
return nil
}
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
guard let value = newValue else {
return
}
put(value: value, key: key, expiration: 10)
}
}
}
```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 {
let data = string.data(using:.utf8)!
let keyData = key.data(using:.utf8)!
let encryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return Data(encryptedData)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using:.utf8)!
let decryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
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 data = string.data(using:.utf8)!
let keyData = key.data(using:.utf8)!
let encryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return Data(encryptedData)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using:.utf8)!
let decryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return String(data: Data(decryptedData), 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)!
let encryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return Data(encryptedData)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using:.utf8)!
let decryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
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 data = string.data(using:.utf8)!
let keyData = key.data(using:.utf8)!
let encryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return Data(encryptedData)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using:.utf8)!
let decryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return String(data: Data(decryptedData), 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)!
let encryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return Data(encryptedData)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using:.utf8)!
let decryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return String(data: Data(decryptedData), encoding:.utf8)!
}
}
class Encryptor2: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let data = string.data(using:.utf8)!
let keyData = key.data(using:.utf8)!
let encryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return Data(encryptedData)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using:.utf8)!
let decryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return String(data: Data(decryptedData), encoding:.utf8)!
}
}
class Encryptor3: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let data = string.data(using:.utf8)!
let keyData = key.data(using:.utf8)!
let encryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return Data(encryptedData)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using:.utf8)!
let decryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return String(data: Data(decryptedData), encoding:.utf8)!
}
}
class Encryptor4: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let data = string.data(using:.utf8)!
let keyData = key.data(using:.utf8)!
let encryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return Data(encryptedData)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using:.utf8)!
let decryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
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 data = string.data(using:.utf8)!
let keyData = key.data(using:.utf8)!
let encryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return Data(encryptedData)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using:.utf8)!
let decryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return String(data: Data(decryptedData), encoding:.utf8)!
}
}
// 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 Encryptor2: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let data = string.data(using:.utf8)!
let keyData = key.data(using:.utf8)!
let encryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return Data(encryptedData)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using:.utf8)!
let decryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return String(data: Data(decryptedData), encoding:.utf8)!
}
}
// 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 Encryptor3: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let data = string.data(using:.utf8)!
let keyData = key.data(using:.utf8)!
let encryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return Data(encryptedData)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using:.utf8)!
let decryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return String(data: Data(decryptedData), encoding:.utf8)!
}
}
// 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 Encryptor4: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let data = string.data(using:.utf8)!
let keyData = key.data(using:.utf8)!
let encryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return Data(encryptedData)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using:.utf8)!
let decryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return String(data: Data(decryptedData), encoding:.utf8)!
}
}
// 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 Encryptor5: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let data = string.data(using:.utf8)!
let keyData = key.data(using:.utf8)!
let encryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return Data(encryptedData)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using:.utf8)!
let decryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return String(data: Data(decryptedData), encodingprotocol 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 encryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return Data(encryptedData)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using:.utf8)!
let decryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
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 data = string.data(using:.utf8)!
let keyData = key.data(using:.utf8)!
let encryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return Data(encryptedData)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using:.utf8)!
let decryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return String(data: Data(decryptedData), 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)!
let encrypted = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return Data(encrypted)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using:.utf8)!
let decrypted = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return String(data: Data(decrypted), encoding:.utf8)!
}
}
class Encryptor2: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let data = string.data(using:.utf8)!
let keyData = key.data(using:.utf8)!
let encrypted = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return Data(encrypted)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using:.utf8)!
let decrypted = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return String(data: Data(decrypted), encoding:.utf8)!
}
}
class Encryptor3: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let data = string.data(using:.utf8)!
let keyData = key.data(using:.utf8)!
let encrypted = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return Data(encrypted)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using:.utf8)!
let decrypted = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return String(data: Data(decrypted), encoding:.utf8)!
}
}
class Encryptor4: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let data = string.data(using:.utf8)!
let keyData = key.data(using:.utf8)!
let encrypted = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return Data(encrypted)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using:.utf8)!
let decrypted = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return String(data: Data(decrypted), encoding:.utf8)!
}
}
class Encryptor5: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let data = string.data(using:.utf8)!
let keyData = key.data(using:.utf8)!
let encrypted = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return Data(encrypted)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using:.utf8)!
let decrypted = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return String(data: Data(decrypted), 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)!
let encrypted = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return Data(encrypted)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using:.utf8)!
let decrypted = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return String(data: Data(decrypted), encoding:.utf8)!
}
}
// 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 Encryptor2: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let data = string.data(using:.utf8)!
let keyData = key.data(using:.utf8)!
let encrypted = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return Data(encrypted)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using:.utf8)!
let decrypted = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return String(data: Data(decrypted), encoding:.utf8)!
}
}
// 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 Encryptor3: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let data = string.data(using:.utf8)!
let keyData = key.data(using:.utf8)!
let encrypted = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return Data(encrypted)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using:.utf8)!
let decrypted = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return String(data: Data(decrypted), encoding:.utf8)!
}
}
// 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 Encryptor4: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let data = string.data(using:.utf8)!
let keyData = key.data(using:.utf8)!
let encrypted = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return Data(encrypted)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using:.utf8)!
let decrypted = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return String(data: Data(decrypted), encoding:.utf8)!
}
}
// 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 Encryptor5: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let data = string.data(using:.utf8)!
let keyData = key.data(using:.utf8)!
let encrypted = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return Data(encrypted)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using:.utf8)!
let decrypted = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return String(data: Data(decrypted), encoding:.utf8)!
}
}
// Simple XOR encryptor and decryptor thatprotocol 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 stringData = string.data(using:.utf8)!
let encryptedData = stringData.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return Data(encryptedData)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using:.utf8)!
let decryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
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 stringData = string.data(using:.utf8)!
let encryptedData = stringData.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return Data(encryptedData)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using:.utf8)!
let decryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return String(data: Data(decryptedData), 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)!
let encryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return Data(encryptedData)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using:.utf8)!
let decryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
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 data = string.data(using:.utf8)!
let keyData = key.data(using:.utf8)!
let encryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return Data(encryptedData)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using:.utf8)!
let decryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return String(data: Data(decryptedData), 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 keyData = key.data(using:.utf8)!
let stringData = string.data(using:.utf8)!
let encryptedData = stringData.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return Data(encryptedData)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using:.utf8)!
let decryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
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 stringData = string.data(using:.utf8)!
let encryptedData = stringData.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return Data(encryptedData)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using:.utf8)!
let decryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return String(data: Data(decryptedData), 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 keyData = key.data(using:.utf8)!
let stringData = string.data(using:.utf8)!
let encryptedData = stringData.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return Data(encryptedData)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using:.utf8)!
let decryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
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 stringData = string.data(using:.utf8)!
let encryptedData = stringData.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return Data(encryptedData)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using:.utf8)!
let decryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return String(data: Data(decryptedData), 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)!
let encryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return Data(encryptedData)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using:.utf8)!
let decryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
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 data = string.data(using:.utf8)!
let keyData = key.data(using:.utf8)!
let encryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return Data(encryptedData)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using:.utf8)!
let decryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return String(data: Data(decryptedData), encoding:.utf8)!
}
}
```protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
class RateLimiter: RateLimiterProtocol {
private let maxRequests: Int
private let timeInterval: TimeInterval
private var requestCount = 0
private var lastRequestTime: Date?
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let now = Date()
let timeSinceLastRequest = now.timeIntervalSince(lastRequestTime?? now)
if timeSinceLastRequest >= timeInterval {
requestCount = 1
lastRequestTime = now
return true
} else if requestCount < maxRequests {
requestCount += 1
return true
} else {
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 let maxRequests: Int
private let timeInterval: TimeInterval
private var requestCount = 0
private var lastRequestTime: Date?
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let now = Date()
let timeSinceLastRequest = now.timeIntervalSince(lastRequestTime?? now)
if timeSinceLastRequest >= timeInterval {
requestCount = 1
lastRequestTime = now
return true
} else if requestCount < maxRequests {
requestCount += 1
return true
} else {
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'let timeSinceLastRequest = now.timeIntervalSince(lastRequestTime?? now) // type of expression is ambiguous without a type annotationlet timeSinceLastRequest = now.timeIntervalSince(lastRequestTime?? now) // expected ',' separatorThread.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 let maxRequests: Int
private let timeInterval: TimeInterval
private var requests: [Date] = []
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let now = Date()
requests.append(now)
let expiredRequests = requests.filter { now.timeIntervalSince($0) > timeInterval }
requests = expiredRequests
return requests.count <= maxRequests
}
}```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 let maxRequests: Int
private let timeInterval: TimeInterval
private var requests: [Date] = []
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let now = Date()
requests.append(now)
let expiredRequests = requests.filter { now.timeIntervalSince($0) > timeInterval }
requests = expiredRequests
return requests.count <= maxRequests
}
}
```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 // XCTAssertFalse failedprotocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
class RateLimiter: RateLimiterProtocol {
private let maxRequests: Int
private let timeInterval: TimeInterval
private var requests: [Date] = []
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let now = Date()
requests.append(now)
let expiredRequests = requests.filter { now.timeIntervalSince($0) > timeInterval }
requests = expiredRequests
return requests.count <= maxRequests
}
}```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 let maxRequests: Int
private let timeInterval: TimeInterval
private var requests: [Date] = []
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let now = Date()
requests.append(now)
let expiredRequests = requests.filter { now.timeIntervalSince($0) > timeInterval }
requests = expiredRequests
return requests.count <= maxRequests
}
}
```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 // XCTAssertFalse failedprotocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
class RateLimiter: RateLimiterProtocol {
private let maxRequests: Int
private let timeInterval: TimeInterval
private var requests: [Date] = []
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let now = Date()
requests.append(now)
let expiredRequests = requests.filter { now.timeIntervalSince($0) > timeInterval }
requests = expiredRequests
return requests.count <= maxRequests
}
}```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 let maxRequests: Int
private let timeInterval: TimeInterval
private var requests: [Date] = []
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let now = Date()
requests.append(now)
let expiredRequests = requests.filter { now.timeIntervalSince($0) > timeInterval }
requests = expiredRequests
return requests.count <= maxRequests
}
}
```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 // XCTAssertFalse failedprotocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
class RateLimiter: RateLimiterProtocol {
private let maxRequests: Int
private let timeInterval: TimeInterval
private var requestCount = 0
private var lastRequestTime: Date?
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
guard let lastRequestTime = lastRequestTime else {
self.lastRequestTime = Date()
requestCount += 1
return true
}
let elapsedTime = Date().timeIntervalSince(lastRequestTime)
if elapsedTime > timeInterval {
self.lastRequestTime = Date()
requestCount = 1
return true
}
if requestCount < maxRequests {
requestCount += 1
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 let maxRequests: Int
private let timeInterval: TimeInterval
private var requestCount = 0
private var lastRequestTime: Date?
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
guard let lastRequestTime = lastRequestTime else {
self.lastRequestTime = Date()
requestCount += 1
return true
}
let elapsedTime = Date().timeIntervalSince(lastRequestTime)
if elapsedTime > timeInterval {
self.lastRequestTime = Date()
requestCount = 1
return true
}
if requestCount < maxRequests {
requestCount += 1
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 6protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
class RateLimiter: RateLimiterProtocol {
private let maxRequests: Int
private let timeInterval: TimeInterval
private var requests: [Date] = []
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let now = Date()
requests.append(now)
while let first = requests.first, first.timeIntervalSince(now) > timeInterval {
requests.removeFirst()
}
return requests.count <= maxRequests
}
}```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 let maxRequests: Int
private let timeInterval: TimeInterval
private var requests: [Date] = []
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let now = Date()
requests.append(now)
while let first = requests.first, first.timeIntervalSince(now) > timeInterval {
requests.removeFirst()
}
return requests.count <= maxRequests
}
}
```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 let maxRequests: Int
private let timeInterval: TimeInterval
private var requests: [Date] = []
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let now = Date()
requests.append(now)
requests = requests.filter { now.timeIntervalSince($0) < timeInterval }
return requests.count <= maxRequests
}
}```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 let maxRequests: Int
private let timeInterval: TimeInterval
private var requests: [Date] = []
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let now = Date()
requests.append(now)
requests = requests.filter { now.timeIntervalSince($0) < timeInterval }
return requests.count <= maxRequests
}
}
```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 let maxRequests: Int
private let timeInterval: TimeInterval
private var requests: [Date] = []
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let now = Date()
requests.append(now)
// Remove requests that are older than the time interval.
requests = requests.filter { now.timeIntervalSince($0) <= timeInterval }
return requests.count <= maxRequests
}
}```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 let maxRequests: Int
private let timeInterval: TimeInterval
private var requests: [Date] = []
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let now = Date()
requests.append(now)
// Remove requests that are older than the time interval.
requests = requests.filter { now.timeIntervalSince($0) <= timeInterval }
return requests.count <= maxRequests
}
}
```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 let maxRequests: Int
private let timeInterval: TimeInterval
private var requests = 0
private var lastRequestTime: Date?
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
guard let lastRequestTime = lastRequestTime else {
self.lastRequestTime = Date()
requests += 1
return true
}
let elapsedTime = Date().timeIntervalSince(lastRequestTime)
if elapsedTime > timeInterval {
self.lastRequestTime = Date()
requests = 1
return true
}
if requests < maxRequests {
requests += 1
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 let maxRequests: Int
private let timeInterval: TimeInterval
private var requests = 0
private var lastRequestTime: Date?
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
guard let lastRequestTime = lastRequestTime else {
self.lastRequestTime = Date()
requests += 1
return true
}
let elapsedTime = Date().timeIntervalSince(lastRequestTime)
if elapsedTime > timeInterval {
self.lastRequestTime = Date()
requests = 1
return true
}
if requests < maxRequests {
requests += 1
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 6protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
class RateLimiter: RateLimiterProtocol {
private let maxRequests: Int
private let timeInterval: TimeInterval
private var requests: [Date] = []
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let now = Date()
requests.append(now)
return requests.filter { now.timeIntervalSince($0) <= timeInterval }.count <= maxRequests
}
}```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 let maxRequests: Int
private let timeInterval: TimeInterval
private var requests: [Date] = []
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let now = Date()
requests.append(now)
return requests.filter { now.timeIntervalSince($0) <= timeInterval }.count <= maxRequests
}
}
```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 ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let queue = DispatchQueue(label: "ThreadSafeCounter")
required init(value: Int) {
self.value = value
}
func increment() {
queue.sync {
value += 1
}
}
func currentValue() -> Int {
return queue.sync {
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 queue = DispatchQueue(label: "ThreadSafeCounter")
required init(value: Int) {
self.value = value
}
func increment() {
queue.sync {
value += 1
}
}
func currentValue() -> Int {
return queue.sync {
value
}
}
}
```protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let lock = NSLock()
required 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()
required 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
}
}
```protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let lock = NSLock()
required 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()
required 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
}
}
```protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private let lock = NSLock()
private var value: Int
required init(value: Int) {
self.value = value
}
func increment() {
lock.lock()
value += 1
lock.unlock()
}
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 let lock = NSLock()
private var value: Int
required init(value: Int) {
self.value = value
}
func increment() {
lock.lock()
value += 1
lock.unlock()
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return value
}
}
```protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let lock = NSLock()
required 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()
required 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
}
}
```protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let lock = NSLock()
required 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()
required 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
}
}
```protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let queue = DispatchQueue(label: "ThreadSafeCounter", attributes:.concurrent)
required init(value: Int) {
self.value = value
}
func increment() {
queue.async(flags:.barrier) {
self.value += 1
}
}
func currentValue() -> Int {
var result: Int = 0
queue.sync {
result = self.value
}
return result
}
}```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 queue = DispatchQueue(label: "ThreadSafeCounter", attributes:.concurrent)
required init(value: Int) {
self.value = value
}
func increment() {
queue.async(flags:.barrier) {
self.value += 1
}
}
func currentValue() -> Int {
var result: Int = 0
queue.sync {
result = self.value
}
return result
}
}
```protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let lock = NSLock()
required 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()
required 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
}
}
```protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let lock = NSLock()
required 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()
required 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
}
}
```protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let lock = NSLock()
required 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()
required 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
}
}
```protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<T>: PipelineProtocol {
typealias Output = T
var value: Output
required init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
return Pipeline<U>(value: transform(value))
}
func execute() -> Output {
return 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<T>: PipelineProtocol {
typealias Output = T
var value: Output
required init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
return Pipeline<U>(value: transform(value))
}
func execute() -> Output {
return value
}
}
// Example usage
let pipeline = Pipeline(value: 10)
.pipe { $0 * 2 }
.pipe { $0 + 10 }
.pipe { String($0) }
.execute()
print(pipeline) // Output: "30"
```protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<T>: PipelineProtocol {
typealias Output = T
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> {
transforms.append(transform)
return Pipeline<U>(value: transform(value))
}
func execute() -> Output {
var result = value
for transform in transforms {
result = transform(result)
}
return result
}
}```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<T>: PipelineProtocol {
typealias Output = T
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> {
transforms.append(transform)
return Pipeline<U>(value: transform(value))
}
func execute() -> Output {
var result = value
for transform in transforms {
result = transform(result)
}
return result
}
}
// 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<T>: PipelineProtocol {
typealias Output = T
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> {
transforms.append(transform)
return Pipeline<U>(value: transform(value))
}
func execute() -> Output {
var result = value
for transform in transforms {
result = transform(result)
}
return result
}
}
// 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<T>: PipelineProtocol {
typealias Output = T
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> {
transforms.append(transform)
return Pipeline<U>(value: transform(value))
}
func execute() -> Output {
var result = value
for transform in transforms {
result = transform(result)
}
return result
}
}
// 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<T>: PipelineProtocol {
typealias Output = T
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> {
transforms.append(transform)
return Pipeline<U>(value: transform(value))
}
func execute() -> Output {
var result = value
for transform in transforms {
result = transform(result)
}
return result
}
}
// 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<T>: PipelineProtocol {
typealias Output = T
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> {
transforms.append(transform)
return Pipeline<U>(value: transform(value))
}
func execute() -> Output {
var result = value
for transform in transforms {
result = transform(result)
}
return result
}
}
// 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<T>: PipelineProtocol {
typealias Output = T
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> {
transforms.append(transform)
return Pipeline<U>(value: transform(value))
}
func execute() -> Output {
var result = value
for transform in transforms {
result = transform(result)
}
return result
}
}
// 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.
classtransforms.append(transform) // cannot convert value of type '(Pipeline<T>.Output) -> U' (aka '(T) -> U') to expected argument type '(T) -> T'protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<T>: PipelineProtocol {
typealias Output = T
private var value: T
private var transforms: [(T) -> T] = []
required init(value: T) {
self.value = value
}
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
transforms.append(transform)
return Pipeline<U>(value: transform(value))
}
func execute() -> T {
var result = value
for transform in transforms {
result = transform(result)
}
return result
}
}```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<T>: PipelineProtocol {
typealias Output = T
private var value: T
private var transforms: [(T) -> T] = []
required init(value: T) {
self.value = value
}
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
transforms.append(transform)
return Pipeline<U>(value: transform(value))
}
func execute() -> T {
var result = value
for transform in transforms {
result = transform(result)
}
return result
}
}
```transforms.append(transform) // cannot convert value of type '(T) -> U' to expected argument type '(T) -> T'protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<T>: PipelineProtocol {
typealias Output = T
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> {
transforms.append(transform)
return Pipeline<U>(value: transform(value))
}
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<T>: PipelineProtocol {
typealias Output = T
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> {
transforms.append(transform)
return Pipeline<U>(value: transform(value))
}
func execute() -> Output {
return transforms.reduce(value) { $1($0) }
}
}
```transforms.append(transform) // cannot convert value of type '(Pipeline<T>.Output) -> U' (aka '(T) -> U') to expected argument type '(T) -> T'protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<T>: PipelineProtocol {
typealias Output = T
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> {
transforms.append(transform)
return Pipeline<U>(value: transform(value))
}
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<T>: PipelineProtocol {
typealias Output = T
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> {
transforms.append(transform)
return Pipeline<U>(value: transform(value))
}
func execute() -> Output {
return transforms.reduce(value) { $1($0) }
}
}
```transforms.append(transform) // cannot convert value of type '(Pipeline<T>.Output) -> U' (aka '(T) -> U') to expected argument type '(T) -> T'protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<T>: PipelineProtocol {
typealias Output = T
private var value: T
private var transforms: [(T) -> T] = []
required init(value: T) {
self.value = value
}
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
transforms.append(transform)
return Pipeline<U>(value: transform(value))
}
func execute() -> T {
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<T>: PipelineProtocol {
typealias Output = T
private var value: T
private var transforms: [(T) -> T] = []
required init(value: T) {
self.value = value
}
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
transforms.append(transform)
return Pipeline<U>(value: transform(value))
}
func execute() -> T {
return transforms.reduce(value) { $1($0) }
}
}
// Example usage
let pipeline = Pipeline(value: 10)
.pipe { $0 * 2 }
.pipe { $0 + 10 }
.pipe { $0 / 5 }
.execute()
print(pipeline) // Output: 6
```transforms.append(transform) // cannot convert value of type '(T) -> U' to expected argument type '(T) -> T'protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<T>: PipelineProtocol {
typealias Output = T
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> {
transforms.append(transform)
return Pipeline<U>(value: transform(value))
}
func execute() -> Output {
var result = value
for transform in transforms {
result = transform(result)
}
return result
}
}```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<T>: PipelineProtocol {
typealias Output = T
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> {
transforms.append(transform)
return Pipeline<U>(value: transform(value))
}
func execute() -> Output {
var result = value
for transform in transforms {
result = transform(result)
}
return result
}
}
```transforms.append(transform) // cannot convert value of type '(Pipeline<T>.Output) -> U' (aka '(T) -> U') to expected argument type '(T) -> T'protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<T>: PipelineProtocol {
typealias Output = T
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> {
transforms.append(transform)
return Pipeline<U>(value: transform(value))
}
func execute() -> Output {
return transforms.reduce(value) { (result, transform) in
transform(result)
}
}
}```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<T>: PipelineProtocol {
typealias Output = T
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> {
transforms.append(transform)
return Pipeline<U>(value: transform(value))
}
func execute() -> Output {
return transforms.reduce(value) { (result, transform) in
transform(result)
}
}
}
// 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<T>: PipelineProtocol {
typealias Output = T
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> {
transforms.append(transform)
return Pipeline<U>(value: transform(value))
}
func execute() -> Output {
return transforms.reduce(value) { (result, transform) in
transform(result)
}
}
}
// 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<T>: PipelineProtocol {
typealias Output = T
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> {
transforms.append(transform)
return Pipeline<U>(value: transform(value))
}
func execute() -> Output {
return transforms.reduce(value) { (result, transform) in
transform(result)
}
}
}
// 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<T>: PipelineProtocol {
typealias Output = T
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> {
transforms.append(transform)
return Pipeline<U>(value: transform(value))
}
func execute() -> Output {
return transforms.reduce(value) { (result, transform) in
transform(result)
}
}
}
// 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<T>: PipelineProtocol {
typealias Output = T
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> {
transforms.append(transform)
return Pipeline<U>(value: transform(value))
}
func execute() -> Output {
return transforms.reduce(value) { (result, transform) in
transform(result)
}
}
}
// 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<T>: PipelineProtocol {
typealias Output = T
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> {
transforms.append(transform)
return Pipeline<U>(value: transform(value))
}
func execute() -> Output {
return transforms.reduce(value) { (result, transform) in
transform(result)
}
}
}
// 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<T>: PipelineProtocoltransforms.append(transform) // cannot convert value of type '(Pipeline<T>.Output) -> U' (aka '(T) -> U') to expected argument type '(T) -> T'protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<T>: PipelineProtocol {
typealias Output = T
private var value: Output
private var transforms: [(Output) -> Output] = []
init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
transforms.append(transform)
return Pipeline<U>(value: transform(value))
}
func execute() -> Output {
var result = value
for transform in transforms {
result = transform(result)
}
return result
}
}```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<T>: PipelineProtocol {
typealias Output = T
private var value: Output
private var transforms: [(Output) -> Output] = []
init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
transforms.append(transform)
return Pipeline<U>(value: transform(value))
}
func execute() -> Output {
var result = value
for transform in transforms {
result = transform(result)
}
return result
}
}
// 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<T>: PipelineProtocol {
typealias Output = T
private var value: Output
private var transforms: [(Output) -> Output] = []
init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
transforms.append(transform)
return Pipeline<U>(value: transform(value))
}
func execute() -> Output {
var result = value
for transform in transforms {
result = transform(result)
}
return result
}
}
// 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<T>: PipelineProtocol {
typealias Output = T
private var value: Output
private var transforms: [(Output) -> Output] = []
init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
transforms.append(transform)
return Pipeline<U>(value: transform(value))
}
func execute() -> Output {
var result = value
for transform in transforms {
result = transform(result)
}
return result
}
}
// 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<T>: PipelineProtocol {
typealias Output = T
private var value: Output
private var transforms: [(Output) -> Output] = []
init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
transforms.append(transform)
return Pipeline<U>(value: transform(value))
}
func execute() -> Output {
var result = value
for transform in transforms {
result = transform(result)
}
return result
}
}
// 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<T>: PipelineProtocol {
typealias Output = T
private var value: Output
private var transforms: [(Output) -> Output] = []
init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
transforms.append(transform)
return Pipeline<U>(value: transform(value))
}
func execute() -> Output {
var result = value
for transform in transforms {
result = transform(result)
}
return result
}
}
// 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<T>: PipelineProtocol {
typealias Output = T
private var value: Output
private var transforms: [(Output) -> Output] = []
init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
transforms.append(transform)
return Pipeline<U>(value: transform(value))
}
func execute() -> Output {
var result = value
for transform in transforms {
result = transform(result)
}
return result
}
}
// 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<T>: PipelineProtocolinit(value: Output) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'Pipeline<T>'transforms.append(transform) // cannot convert value of type '(Pipeline<T>.Output) -> U' (aka '(T) -> U') to expected argument type '(T) -> T'protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<T>: PipelineProtocol {
typealias Output = T
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> {
transforms.append(transform)
return Pipeline<U>(value: transform(value))
}
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<T>: PipelineProtocol {
typealias Output = T
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> {
transforms.append(transform)
return Pipeline<U>(value: transform(value))
}
func execute() -> Output {
return transforms.reduce(value) { $1($0) }
}
}
// 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<T>: PipelineProtocol {
typealias Output = T
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> {
transforms.append(transform)
return Pipeline<U>(value: transform(value))
}
func execute() -> Output {
return transforms.reduce(value) { $1($0) }
}
}
// 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<T>: PipelineProtocol {
typealias Output = T
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> {
transforms.append(transform)
return Pipeline<U>(value: transform(value))
}
func execute() -> Output {
return transforms.reduce(value) { $1($0) }
}
}
// 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<T>: PipelineProtocol {
typealias Output = T
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> {
transforms.append(transform)
return Pipeline<U>(value: transform(value))
}
func execute() -> Output {
return transforms.reduce(value) { $1($0) }
}
}
// 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<T>: PipelineProtocol {
typealias Output = T
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> {
transforms.append(transform)
return Pipeline<U>(value: transform(value))
}
func execute() -> Output {
return transforms.reduce(value) { $1($0) }
}
}
// 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<T>: PipelineProtocol {
typealias Output = T
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> {
transforms.append(transform)
return Pipeline<U>(value: transform(value))
}
func execute() -> Output {
return transforms.reduce(value) { $1($0) }
}
}
// 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<T>: PipelineProtocol {
typealias Output = T
private var value: Output
private var transforms: [(Output) -> Output] = []
required init(value: Output) {
self.value = value
transforms.append(transform) // cannot convert value of type '(Pipeline<T>.Output) -> U' (aka '(T) -> U') to expected argument type '(T) -> T'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 var value: Value
private var nextObserverId: UUID = UUID()
required init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let observerId = nextObserverId
observers[observerId] = observer
nextObserverId = UUID()
return observerId
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
func setValue(_ 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 var value: Value
private var nextObserverId: UUID = UUID()
required init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let observerId = nextObserverId
observers[observerId] = observer
nextObserverId = UUID()
return observerId
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
func setValue(_ 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 var value: Value
private var nextObserverId: UUID = UUID()
required init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let observerId = nextObserverId
observers[observerId] = observer
nextObserverId = UUID()
return observerId
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
func setValue(_ newValue: Value) {
value = newValue
observers.values.forEach { $0(newValue) }
}
}
```private var value: Value // property 'value' must be declared internal because it matches a requirement in internal protocol 'ObservablePropertyProtocol'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 {
private var observers = [UUID: (Value) -> Void]()
private var nextObserverId = UUID()
private var _value: Value
init(value: Value) {
_value = value
}
var value: Value {
get {
return _value
}
set {
_value = newValue
for (_, observer) in observers {
observer(_value)
}
}
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = nextObserverId
nextObserverId = UUID()
observers[id] = observer
return id
}
func unsubscribe(_ observer: UUID) {
observers.removeValue(forKey: 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> : ObservablePropertyProtocol {
private var observers = [UUID: (Value) -> Void]()
private var nextObserverId = UUID()
private var _value: Value
init(value: Value) {
_value = value
}
var value: Value {
get {
return _value
}
set {
_value = newValue
for (_, observer) in observers {
observer(_value)
}
}
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = nextObserverId
nextObserverId = UUID()
observers[id] = observer
return id
}
func unsubscribe(_ observer: UUID) {
observers.removeValue(forKey: observer)
}
}
```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> : ObservablePropertyProtocol {
private var observers: [UUID: (Value) -> Void] = [:]
private var value: Value
required init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
return uuid
}
func unsubscribe(_ observer: UUID) {
observers.removeValue(forKey: observer)
}
func notifyObservers() {
for (_, observer) in observers {
observer(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 {
private var observers: [UUID: (Value) -> Void] = [:]
private var value: Value
required init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
return uuid
}
func unsubscribe(_ observer: UUID) {
observers.removeValue(forKey: observer)
}
func notifyObservers() {
for (_, observer) in observers {
observer(value)
}
}
}
```private var value: Value // property 'value' must be declared internal because it matches a requirement in internal protocol 'ObservablePropertyProtocol'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 {
private var observers: [UUID: (Value) -> Void] = [:]
private var value: Value
private var nextObserverId: UUID = UUID()
required init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let observerId = nextObserverId
nextObserverId = UUID()
observers[observerId] = observer
return observerId
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
func notifyObservers() {
for (_, observer) in observers {
observer(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 {
private var observers: [UUID: (Value) -> Void] = [:]
private var value: Value
private var nextObserverId: UUID = UUID()
required init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let observerId = nextObserverId
nextObserverId = UUID()
observers[observerId] = observer
return observerId
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
func notifyObservers() {
for (_, observer) in observers {
observer(value)
}
}
}
```private var value: Value // property 'value' must be declared internal because it matches a requirement in internal protocol 'ObservablePropertyProtocol'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 {
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
return uuid
}
func unsubscribe(_ observer: UUID) {
observers.removeValue(forKey: observer)
}
func notifyObservers() {
for (_, observer) in observers {
observer(value)
}
}
}
class ObservableVariable<Value> : ObservableProperty<Value> {
override var value: Value {
didSet {
notifyObservers()
}
}
}```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 {
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
return uuid
}
func unsubscribe(_ observer: UUID) {
observers.removeValue(forKey: observer)
}
func notifyObservers() {
for (_, observer) in observers {
observer(value)
}
}
}
// A property that can be observed and can be set.
class ObservableVariable<Value> : ObservableProperty<Value> {
override var value: Value {
didSet {
notifyObservers()
}
}
}
```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>'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 {
private var observers: [UUID: (Value) -> Void] = [:]
private var value: Value
private let queue = DispatchQueue(label: "ObservableProperty")
required init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
queue.sync {
observers[uuid] = observer
}
return uuid
}
func unsubscribe(_ observer: UUID) {
queue.sync {
observers[observer] = nil
}
}
func setValue(_ newValue: Value) {
queue.sync {
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 {
private var observers: [UUID: (Value) -> Void] = [:]
private var value: Value
private let queue = DispatchQueue(label: "ObservableProperty")
required init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
queue.sync {
observers[uuid] = observer
}
return uuid
}
func unsubscribe(_ observer: UUID) {
queue.sync {
observers[observer] = nil
}
}
func setValue(_ newValue: Value) {
queue.sync {
value = newValue
observers.values.forEach { $0(newValue) }
}
}
}
```private var value: Value // property 'value' must be declared internal because it matches a requirement in internal protocol 'ObservablePropertyProtocol'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 {
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
return uuid
}
func unsubscribe(_ observer: UUID) {
observers.removeValue(forKey: observer)
}
func notifyObservers() {
observers.values.forEach { $0(value) }
}
}
class ObservableSettableProperty<Value> : ObservableProperty<Value> {
override var value: Value {
didSet {
notifyObservers()
}
}
}```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 {
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
return uuid
}
func unsubscribe(_ observer: UUID) {
observers.removeValue(forKey: observer)
}
func notifyObservers() {
observers.values.forEach { $0(value) }
}
}
// A property that can be observed and can be set.
class ObservableSettableProperty<Value> : ObservableProperty<Value> {
override var value: Value {
didSet {
notifyObservers()
}
}
}
```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>'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 {
private var observers: [UUID: (Value) -> Void] = [:]
private var value: Value
private var nextObserverId: UUID = UUID()
required init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let observerId = nextObserverId
observers[observerId] = observer
nextObserverId = UUID()
return observerId
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
func notifyObservers() {
for observer in observers.values {
observer(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 {
private var observers: [UUID: (Value) -> Void] = [:]
private var value: Value
private var nextObserverId: UUID = UUID()
required init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let observerId = nextObserverId
observers[observerId] = observer
nextObserverId = UUID()
return observerId
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
func notifyObservers() {
for observer in observers.values {
observer(value)
}
}
}
// A property that notifies observers of value changes.
class ObservableProperty<Value> : ObservablePropertyProtocol {
private var observers: [UUID: (Value) -> Void] = [:]
private var value: Value
private var nextObserverId: UUID = UUID()
required init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let observerId = nextObserverId
observers[observerId] = observer
nextObserverId = UUID()
return observerId
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
func notifyObservers() {
for observer in observers.values {
observer(value)
}
}
}
```private var value: Value // property 'value' must be declared internal because it matches a requirement in internal protocol 'ObservablePropertyProtocol'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 var value: Value
private var nextObserverId: UUID = UUID()
required init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let observerId = nextObserverId
nextObserverId = UUID()
observers[observerId] = observer
return observerId
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
func notifyObservers() {
for (_, observer) in observers {
observer(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
private var nextObserverId: UUID = UUID()
required init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let observerId = nextObserverId
nextObserverId = UUID()
observers[observerId] = observer
return observerId
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
func notifyObservers() {
for (_, observer) in observers {
observer(value)
}
}
}
```private var value: Value // property 'value' must be declared internal because it matches a requirement in internal protocol 'ObservablePropertyProtocol'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 {
private var observers: [UUID: (Value) -> Void] = [:]
private var value: Value
private var nextObserverId = 0
required init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers[id] = observer
return id
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
func notifyObservers() {
for (_, observer) in observers {
observer(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 {
private var observers: [UUID: (Value) -> Void] = [:]
private var value: Value
private var nextObserverId = 0
required init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers[id] = observer
return id
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
func notifyObservers() {
for (_, observer) in observers {
observer(value)
}
}
}
```private var value: Value // property 'value' must be declared internal because it matches a requirement in internal protocol 'ObservablePropertyProtocol'protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<Value: Comparable> {
private var value: Value
private let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = wrappedValue
self.range = range
}
var wrappedValue: Value {
get { value }
set { value = min(max(newValue, range.lowerBound), range.upperBound) }
}
}
extension Clamped: ClampedProtocol {
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.init(wrappedValue: 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> {
private var value: Value
private let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = wrappedValue
self.range = range
}
var wrappedValue: Value {
get { value }
set { value = min(max(newValue, range.lowerBound), range.upperBound) }
}
}
extension Clamped: ClampedProtocol {
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.init(wrappedValue: wrappedValue, range)
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable> {
private var value: Value
private let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = wrappedValue
self.range = range
}
var wrappedValue: Value {
get { value }
set { value = min(max(newValue, range.lowerBound), range.upperBound) }
}
}
extension Clamped: ClampedProtocol {
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.init(wrappedValue: wrappedValue, range)
}
}
```init(wrappedValue: Value, _ range: ClosedRange<Value>) { // invalid redeclaration of 'init(wrappedValue:_:)'protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<Value: Comparable> {
private var value: Value
private let range: ClosedRange<Value>
var wrappedValue: Value {
get { value }
set { value = min(max(range.lowerBound, newValue), range.upperBound) }
}
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = wrappedValue
self.range = range
}
}
extension Clamped: ClampedProtocol {}
// Usage
struct Foo {
@Clamped(0...100) var bar: Int
}```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> {
private var value: Value
private let range: ClosedRange<Value>
var wrappedValue: Value {
get { value }
set { value = min(max(range.lowerBound, newValue), range.upperBound) }
}
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = wrappedValue
self.range = range
}
}
extension Clamped: ClampedProtocol {}
// Usage
struct Foo {
@Clamped(0...100) var bar: Int
}
let foo = Foo(bar: 101)
print(foo.bar) // 100
```@Clamped(0...100) var bar: Int // missing argument for parameter 'wrappedValue' in callprotocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<Value: Comparable> {
private var value: Value
private let range: ClosedRange<Value>
var wrappedValue: Value {
get { value }
set { value = min(max(range.lowerBound, newValue), range.upperBound) }
}
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = min(max(range.lowerBound, wrappedValue), range.upperBound)
self.range = range
}
}
extension Clamped: ClampedProtocol {}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable> {
private var value: Value
private let range: ClosedRange<Value>
var wrappedValue: Value {
get { value }
set { value = min(max(range.lowerBound, newValue), range.upperBound) }
}
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = min(max(range.lowerBound, wrappedValue), range.upperBound)
self.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<Value: Comparable> {
private var value: Value
private let range: ClosedRange<Value>
var wrappedValue: Value {
get { value }
set { value = min(max(range.lowerBound, newValue), range.upperBound) }
}
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = min(max(range.lowerBound, wrappedValue), range.upperBound)
self.range = range
}
}
extension Clamped: ClampedProtocol {}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable> {
private var value: Value
private let range: ClosedRange<Value>
var wrappedValue: Value {
get { value }
set { value = min(max(range.lowerBound, newValue), range.upperBound) }
}
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = min(max(range.lowerBound, wrappedValue), range.upperBound)
self.range = range
}
}
extension Clamped: ClampedProtocol {}
```extension Clamped: ClampedProtocol {} // 'Clamped' is ambiguous for type lookup in this contextstruct Clamped<Value: Comparable> { // invalid redeclaration of 'Clamped'@Clamped(0...10) var value: Int = 0 // 'Clamped' is ambiguous for type lookup in this contextprotocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<Value: Comparable> {
private var value: Value
private let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = wrappedValue
self.range = range
}
var wrappedValue: Value {
get { value }
set { value = min(max(range.lowerBound, newValue), range.upperBound) }
}
}
extension Clamped: ClampedProtocol {}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable> {
private var value: Value
private let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = wrappedValue
self.range = range
}
var wrappedValue: Value {
get { value }
set { value = min(max(range.lowerBound, newValue), range.upperBound) }
}
}```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> {
private var value: Value
private let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = wrappedValue
self.range = range
}
var wrappedValue: Value {
get { value }
set { value = min(max(range.lowerBound, newValue), range.upperBound) }
}
}
extension Clamped: ClampedProtocol {}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable> {
private var value: Value
private let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = wrappedValue
self.range = range
}
var wrappedValue: Value {
get { value }
set { value = min(max(range.lowerBound, newValue), range.upperBound) }
}
}
extension Clamped: ClampedProtocol {}
```extension Clamped: ClampedProtocol {} // 'Clamped' is ambiguous for type lookup in this contextstruct Clamped<Value: Comparable> { // invalid redeclaration of 'Clamped'@Clamped(0...10) var value: Int = 0 // 'Clamped' is ambiguous for type lookup in this contextprotocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<Value: Comparable> {
private var value: Value
private let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = wrappedValue
self.range = range
}
var wrappedValue: Value {
get { value }
set { value = min(max(newValue, range.lowerBound), range.upperBound) }
}
}```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> {
private var value: Value
private let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = wrappedValue
self.range = range
}
var wrappedValue: Value {
get { value }
set { value = min(max(newValue, range.lowerBound), range.upperBound) }
}
}
extension Clamped: ClampedProtocol {}
```protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<Value: Comparable> {
private var value: Value
private let range: ClosedRange<Value>
var wrappedValue: Value {
get { value }
set { value = min(max(range.lowerBound, newValue), range.upperBound) }
}
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.range = range
self.value = min(max(range.lowerBound, wrappedValue), range.upperBound)
}
}
extension Clamped: ClampedProtocol {}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable> {
private var value: Value
private let range: ClosedRange<Value>
var wrappedValue: Value {
get { value }
set { value = min(max(range.lowerBound, newValue), range.upperBound) }
}
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.range = range
self.value = min(max(range.lowerBound, wrappedValue), range.upperBound)
}
}```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> {
private var value: Value
private let range: ClosedRange<Value>
var wrappedValue: Value {
get { value }
set { value = min(max(range.lowerBound, newValue), range.upperBound) }
}
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.range = range
self.value = min(max(range.lowerBound, wrappedValue), range.upperBound)
}
}
extension Clamped: ClampedProtocol {}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable> {
private var value: Value
private let range: ClosedRange<Value>
var wrappedValue: Value {
get { value }
set { value = min(max(range.lowerBound, newValue), range.upperBound) }
}
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.range = range
self.value = min(max(range.lowerBound, wrappedValue), range.upperBound)
}
}
extension Clamped: ClampedProtocol {}
```extension Clamped: ClampedProtocol {} // 'Clamped' is ambiguous for type lookup in this contextstruct Clamped<Value: Comparable> { // invalid redeclaration of 'Clamped'@Clamped(0...10) var value: Int = 0 // 'Clamped' is ambiguous for type lookup in this contextprotocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<Value: Comparable> {
private var value: Value
private let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = wrappedValue
self.range = range
}
var wrappedValue: Value {
get { value }
set { value = min(max(newValue, range.lowerBound), range.upperBound) }
}
}```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> {
private var value: Value
private let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = wrappedValue
self.range = range
}
var wrappedValue: Value {
get { value }
set { value = min(max(newValue, range.lowerBound), range.upperBound) }
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable> {
private var value: Value
private let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = wrappedValue
self.range = range
}
var wrappedValue: Value {
get { value }
set { value = min(max(newValue, range.lowerBound), range.upperBound) }
}
}
```protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
private var value: Value
private let range: ClosedRange<Value>
var wrappedValue: Value {
get { value }
set { value = min(max(newValue, range.lowerBound), range.upperBound) }
}
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = wrappedValue
self.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<Value: Comparable>: ClampedProtocol {
private var value: Value
private let range: ClosedRange<Value>
var wrappedValue: Value {
get { value }
set { value = min(max(newValue, range.lowerBound), range.upperBound) }
}
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = wrappedValue
self.range = range
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
private var value: Value
private let range: ClosedRange<Value>
var wrappedValue: Value {
get { value }
set { value = min(max(newValue, range.lowerBound), range.upperBound) }
}
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = wrappedValue
self.range = range
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
private var value: Value
private let range: ClosedRange<Value>
var wrappedValue: Value {
get { value }
set { value = min(max(newValue, range.lowerBound), range.upperBound) }
}
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = wrappedValue
self.range = range
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
private var value: Value
private let range: ClosedRange<Value>
var wrappedValue: Value {
get { value }
set { value = min(max(newValue, range.lowerBound), range.upperBound) }
}
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = wrappedValue
self.range = range
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
private var value: Value
private let range: ClosedRange<Value>
var wrappedValue: Value {
get { value }
set { value = min(max(newValue, range.lowerBound), range.upperBound) }
}
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = wrappedValue
self.range = range
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
private var value: Value
private let range: ClosedRange<Value>
var wrappedValue: Value {
get { value }
set { value = min(max(newValue, range.lowerBound), range.upperBound) }
}
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = wrappedValue
self.range = range
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
private var value: Value
private let range: ClosedRange<Value>
var wrappedValue: Value {
get { value }
set { value = min(max(newValue, range.lowerBound), range.upperBound) }
}
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = wrappedValue
self.range = range
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
private var value: Value
private let range: ClosedRange<Value>
var wrappedValue: Value {
get { value }
set { value = min(max(newValue, range.lowerBound), range.upperBound) }
}
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = wrappedValue
self.range = range
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
private var value: Value
private let range: ClosedRange<Value>
var wrappedValue: Value {
get { value }
set { value = min(max(newValue, range.lowerBound), range.upperBound) }
}
init(wrappedValue: Value, _ range:protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<Value: Comparable> {
private var value: Value
private let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = wrappedValue
self.range = range
}
var wrappedValue: Value {
get { value }
set { value = min(max(newValue, range.lowerBound), range.upperBound) }
}
}```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> {
private var value: Value
private let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = wrappedValue
self.range = range
}
var wrappedValue: Value {
get { value }
set { value = min(max(newValue, range.lowerBound), range.upperBound) }
}
}
extension Clamped: ClampedProtocol {}
```protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<Value: Comparable> {
private var value: Value
private let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = wrappedValue
self.range = range
}
var wrappedValue: Value {
get { value }
set { value = min(max(newValue, range.lowerBound), range.upperBound) }
}
}```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> {
private var value: Value
private let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = wrappedValue
self.range = range
}
var wrappedValue: Value {
get { value }
set { value = min(max(newValue, range.lowerBound), range.upperBound) }
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable> {
private var value: Value
private let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = wrappedValue
self.range = range
}
var wrappedValue: Value {
get { value }
set { value = min(max(newValue, range.lowerBound), range.upperBound) }
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable> {
private var value: Value
private let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = wrappedValue
self.range = range
}
var wrappedValue: Value {
get { value }
set { value = min(max(newValue, range.lowerBound), range.upperBound) }
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable> {
private var value: Value
private let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = wrappedValue
self.range = range
}
var wrappedValue: Value {
get { value }
set { value = min(max(newValue, range.lowerBound), range.upperBound) }
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable> {
private var value: Value
private let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = wrappedValue
self.range = range
}
var wrappedValue: Value {
get { value }
set { value = min(max(newValue, range.lowerBound), range.upperBound) }
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable> {
private var value: Value
private let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = wrappedValue
self.range = range
}
var wrappedValue: Value {
get { value }
set { value = min(max(newValue, range.lowerBound), range.upperBound) }
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable> {
private var value: Value
private let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = wrappedValue
self.range = range
}
var wrappedValue: Value {
get { value }
set { value = min(max(newValue, range.lowerBound), range.upperBound) }
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable> {
private var value: Value
private let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = wrappedValue
self.range = range
}
var wrappedValue: Value {
get { value }
set { value = min(max(newValue, range.lowerBound), range.upperBound) }
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable> {
private var value: Value
private let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = wrappedValue
self.range = range
}
var wrappedValue: Value {
get { value }
set { value = min(max(newValue, range.lowerBound), range.upperBound) }
}
}
// Property wrapper that clamps value within a specified rangeenum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<Value> : LoggedProtocol {
var wrappedValue: Value
var logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Logged<Value> {
self
}
mutating func log(_ event: Event, _ value: Value) {
logger(event, value)
}
}
struct User {
@Logged(logger: { event, value in
print("Logged \(event) of \(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
var logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Logged<Value> {
self
}
mutating func log(_ event: Event, _ value: Value) {
logger(event, value)
}
}
struct User {
@Logged(logger: { event, value in
print("Logged \(event) of \(value)")
})
var name: String
}
var user = User(name: "")
user.name = ""
// Prints "Logged set of "
```@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
var 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 }
}
subscript(wrapped wrappedValue: inout Value) -> Value {
get {
logger(.get, wrappedValue)
return wrappedValue
}
set {
logger(.set, newValue)
wrappedValue = newValue
}
}
}```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
var 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 }
}
subscript(wrapped wrappedValue: inout Value) -> Value {
get {
logger(.get, wrappedValue)
return wrappedValue
}
set {
logger(.set, newValue)
wrappedValue = newValue
}
}
}
// A property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value> : LoggedProtocol {
var wrappedValue: Value
var 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 }
}
subscript(wrapped wrappedValue: inout Value) -> Value {
get {
logger(.get, wrappedValue)
return wrappedValue
}
set {
logger(.set, newValue)
wrappedValue = newValue
}
}
}
// A property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value> : LoggedProtocol {
var wrappedValue: Value
var 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 }
}
subscript(wrapped wrappedValue: inout Value) -> Value {
get {
logger(.get, wrappedValue)
return wrappedValue
}
set {
logger(.set, newValue)
wrappedValue = newValue
}
}
}
// A property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value> : LoggedProtocol {
var wrappedValue: Value
var 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 }
}
subscript(wrapped wrappedValue: inout Value) -> Value {
get {
logger(.get, wrappedValue)
return wrappedValue
}
set {
logger(.set, newValue)
wrappedValue = newValue
}
}
}
// A property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value> : LoggedProtocol {
var wrappedValue: Value
var 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 }
}
subscript(wrapped wrappedValue: inout Value) -> Value {
get {
logger(.get, wrappedValue)
return wrappedValue
}
set {
logger(.set, newValue)
wrappedValue = newValue
}
}
}
// A property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value> : LoggedProtocol {
var wrappedValue: Value
var 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 }
}
subscript(wrapped wrappedValue: inout Value) -> Value {
get {
logger(.get, wrappedValue)
return wrappedValue
}
set {
logger(.set, newValue)
wrappedValue = newValue
}
}
}
// A property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value> : LoggedProtocol {
var wrappedValue: Value
var logger: (Event, Value) -> Void
init(wrappedsubscript(wrapped wrappedValue: inout Value) -> Value { // 'inout' must not be used on subscript parametersenum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<Value> : LoggedProtocol {
var wrappedValue: Value
var 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 }
}
subscript(wrapped wrappedValue: Value) -> Value {
get {
logger(.get, wrappedValue)
return wrappedValue
}
set {
logger(.set, newValue)
wrappedValue = newValue
}
}
}```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
var 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 }
}
subscript(wrapped wrappedValue: Value) -> Value {
get {
logger(.get, wrappedValue)
return wrappedValue
}
set {
logger(.set, newValue)
wrappedValue = newValue
}
}
}
// A property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value> : LoggedProtocol {
var wrappedValue: Value
var 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 }
}
subscript(wrapped wrappedValue: Value) -> Value {
get {
logger(.get, wrappedValue)
return wrappedValue
}
set {
logger(.set, newValue)
wrappedValue = newValue
}
}
}
// A property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value> : LoggedProtocol {
var wrappedValue: Value
var 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 }
}
subscript(wrapped wrappedValue: Value) -> Value {
get {
logger(.get, wrappedValue)
return wrappedValue
}
set {
logger(.set, newValue)
wrappedValue = newValue
}
}
}
// A property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value> : LoggedProtocol {
var wrappedValue: Value
var 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 }
}
subscript(wrapped wrappedValue: Value) -> Value {
get {
logger(.get, wrappedValue)
return wrappedValue
}
set {
logger(.set, newValue)
wrappedValue = newValue
}
}
}
// A property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value> : LoggedProtocol {
var wrappedValue: Value
var 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 }
}
subscript(wrapped wrappedValue: Value) -> Value {
get {
logger(.get, wrappedValue)
return wrappedValue
}
set {
logger(.set, newValue)
wrappedValue = newValue
}
}
}
// A property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value> : LoggedProtocol {
var wrappedValue: Value
var 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 }
}
subscript(wrapped wrappedValue: Value) -> Value {
get {
logger(.get, wrappedValue)
return wrappedValue
}
set {
logger(.set, newValue)
wrappedValue = newValue
}
}
}
// A property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value> : LoggedProtocol {
var wrappedValue: Value
var logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (EventwrappedValue = newValue // cannot assign to value: 'wrappedValue' is immutableenum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<Value> : LoggedProtocol {
var wrappedValue: Value
var logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Logged<Value> {
get {
logger(.get, wrappedValue)
return self
}
set {
logger(.set, newValue.wrappedValue)
wrappedValue = newValue.wrappedValue
}
}
}
struct User {
@Logged(logger: { event, value in
print("Logged \(event) with value \(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
var logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Logged<Value> {
get {
logger(.get, wrappedValue)
return self
}
set {
logger(.set, newValue.wrappedValue)
wrappedValue = newValue.wrappedValue
}
}
}
struct User {
@Logged(logger: { event, value in
print("Logged \(event) with value \(value)")
})
var name: String
}
var user = User(name: "")
user.name = ""
// Prints "Logged set with value "
```@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
var 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
var 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> : LoggedProtocol {
var wrappedValue: Value
var 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> : LoggedProtocol {
var wrappedValue: Value
var 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> : LoggedProtocol {
var wrappedValue: Value
var 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> : LoggedProtocol {
var wrappedValue: Value
var 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> : LoggedProtocol {
var wrappedValue: Value
var 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> : LoggedProtocol {
var wrappedValue: Value
var 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> : LoggedProtocol {
var wrappedValue: Value
var 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> : LoggedProtocol {
var wrappedValue: Value
var 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> : LoggedProtocol {
var wrappedValue: Value
var 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> : LoggedProtocol {
var wrappedValue: Value
var 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> : LoggedProtocol {
var wrappedValue: Value
var logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void // XCTAssertEqual failed: ([]) is not equal to (["Accessing value: 0"])enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@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
}
var projectedValue: LoggedProtocol<Value> {
LoggedProtocol(wrappedValue: wrappedValue, 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> {
var wrappedValue: Value
let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: LoggedProtocol<Value> {
LoggedProtocol(wrappedValue: wrappedValue, 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
}
var projectedValue: LoggedProtocol<Value> {
LoggedProtocol(wrappedValue: wrappedValue, 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
}
var projectedValue: LoggedProtocol<Value> {
LoggedProtocol(wrappedValue: wrappedValue, 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
}
var projectedValue: LoggedProtocol<Value> {
LoggedProtocol(wrappedValue: wrappedValue, 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
}
var projectedValue: LoggedProtocol<Value> {
LoggedProtocol(wrappedValue: wrappedValue, 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
}
var projectedValue: LoggedProtocol<Value> {
LoggedProtocol(wrappedValue: wrappedValue, 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
}
var projectedValue: LoggedProtocol<Value> {
LoggedProtocol(wrappedValue: wrappedValue, 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
}
var projectedValue: LoggedProtocol<Value> {
LoggedProtocol(wrappedValue: wrappedValue, 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
}
var projectedValue: LoggedProtocol<Value> {
LoggedProtocol(wrappedValue: wrappedValue, logger: logger)
}
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logvar projectedValue: LoggedProtocol<Value> { // protocol 'LoggedProtocol' does not have primary associated types that can be constrainedenum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<Value> : LoggedProtocol {
private var value: Value
private let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.value = wrappedValue
self.logger = logger
}
var wrappedValue: Value {
get {
logger(.get, value)
return value
}
set {
logger(.set, newValue)
value = newValue
}
}
}```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 {
private var value: Value
private let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.value = wrappedValue
self.logger = logger
}
var wrappedValue: Value {
get {
logger(.get, value)
return value
}
set {
logger(.set, newValue)
value = newValue
}
}
}
// A property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value> : LoggedProtocol {
private var value: Value
private let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.value = wrappedValue
self.logger = logger
}
var wrappedValue: Value {
get {
logger(.get, value)
return value
}
set {
logger(.set, newValue)
value = newValue
}
}
}
// A property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value> : LoggedProtocol {
private var value: Value
private let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.value = wrappedValue
self.logger = logger
}
var wrappedValue: Value {
get {
logger(.get, value)
return value
}
set {
logger(.set, newValue)
value = newValue
}
}
}
// A property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value> : LoggedProtocol {
private var value: Value
private let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.value = wrappedValue
self.logger = logger
}
var wrappedValue: Value {
get {
logger(.get, value)
return value
}
set {
logger(.set, newValue)
value = newValue
}
}
}
// A property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value> : LoggedProtocol {
private var value: Value
private let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.value = wrappedValue
self.logger = logger
}
var wrappedValue: Value {
get {
logger(.get, value)
return value
}
set {
logger(.set, newValue)
value = newValue
}
}
}
// A property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value> : LoggedProtocol {
private var value: Value
private let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.value = wrappedValue
self.logger = logger
}
var wrappedValue: Value {
get {
logger(.get, value)
return value
}
set {
logger(.set, newValue)
value = newValue
}
}
}
// A property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value> : LoggedProtocol {
private var value: Value
private let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.value = wrappedValue
self.logger = logger
}
var wrappedValue: Value {
get {
logger(.get, value)
return value
}
set {
logger(.set, newValue)
value = newValue
}
}
}
// A property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value> : LoggedProtocol {
private var value: Value
private let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.value = wrappedValue
self.logger = logger
}
var wrappedValue: Value {
get {
logger(.get, value)
return value
}
set {
logger(.set, newValue)
value = newValue
}
}
}
// A property wrapper that logs accessenum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<T> : LoggedProtocol {
var wrappedValue: T
var logger: (Event, T) -> Void
init(wrappedValue: T, logger: @escaping (Event, T) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Logged<T> {
get { self }
set { self = newValue }
}
}```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<T> : LoggedProtocol {
var wrappedValue: T
var logger: (Event, T) -> Void
init(wrappedValue: T, logger: @escaping (Event, T) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Logged<T> {
get { self }
set { self = newValue }
}
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<T> : LoggedProtocol {
var wrappedValue: T
var logger: (Event, T) -> Void
init(wrappedValue: T, logger: @escaping (Event, T) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Logged<T> {
get { self }
set { self = newValue }
}
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<T> : LoggedProtocol {
var wrappedValue: T
var logger: (Event, T) -> Void
init(wrappedValue: T, logger: @escaping (Event, T) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Logged<T> {
get { self }
set { self = newValue }
}
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<T> : LoggedProtocol {
var wrappedValue: T
var logger: (Event, T) -> Void
init(wrappedValue: T, logger: @escaping (Event, T) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Logged<T> {
get { self }
set { self = newValue }
}
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<T> : LoggedProtocol {
var wrappedValue: T
var logger: (Event, T) -> Void
init(wrappedValue: T, logger: @escaping (Event, T) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Logged<T> {
get { self }
set { self = newValue }
}
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<T> : LoggedProtocol {
var wrappedValue: T
var logger: (Event, T) -> Void
init(wrappedValue: T, logger: @escaping (Event, T) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Logged<T> {
get { self }
set { self = newValue }
}
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<T> : LoggedProtocol {
var wrappedValue: T
var logger: (Event, T) -> Void
init(wrappedValue: T, logger: @escaping (Event, T) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Logged<T> {
get { self }
set { self = newValue }
}
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<T> : LoggedProtocol {
var wrappedValue: T
var logger: (Event, T) -> Void
init(wrappedValue: T, logger: @escaping (Event, T) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Logged<T> {
get { self }
set { self = newValue }
}
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<T> : LoggedProtocol {
var wrappedValue: T
var logger: (Event, T) -> Void
init(wrappedValue: T, logger: @escaping (Event, T) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Logged<T> {
get { self }
set { self = newValue }
}
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Log // XCTAssertEqual failed: ([]) is not equal to (["Accessing value: 0"])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
var logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
@propertyWrapper
struct Logged2<Value> : LoggedProtocol {
var wrappedValue: Value
var logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
@propertyWrapper
struct Logged3<Value> : LoggedProtocol {
var wrappedValue: Value
var logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
@propertyWrapper
struct Logged4<Value> : LoggedProtocol {
var wrappedValue: Value
var logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
@propertyWrapper
struct Logged5<Value> : LoggedProtocol {
var wrappedValue: Value
var logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
@propertyWrapper
struct Logged6<Value> : LoggedProtocol {
var wrappedValue: Value
var logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
@propertyWrapper
struct Logged7<Value> : LoggedProtocol {
var wrappedValue: Value
var logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
@propertyWrapper
struct Logged8<Value> : LoggedProtocol {
var wrappedValue: Value
var logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
@propertyWrapper
struct Logged9<Value> : LoggedProtocol {
var wrappedValue: Value
var logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
@propertyWrapper
struct Logged10<Value> : LoggedProtocol {
var wrappedValue: Value
var logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
@propertyWrapper
struct Logged11<Value> : LoggedProtocol {
var wrappedValue: Value
var 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
var 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 Logged2<Value> : LoggedProtocol {
var wrappedValue: Value
var 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 Logged3<Value> : LoggedProtocol {
var wrappedValue: Value
var 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 Logged4<Value> : LoggedProtocol {
var wrappedValue: Value
var 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 Logged5<Value> : LoggedProtocol {
var wrappedValue: Value
var 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 Logged6<Value> : LoggedProtocol {
var wrappedValue: Value
var 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 Logged7<Value> : LoggedProtocol {
var wrappedValue: Value
var 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 Logged8<Value> : LoggedProtocol {
var wrappedValue: Value
var 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 Logged9<Value> : LoggedProtocol {
var wrappedValue: Value
var 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 Logged10<Value> : LoggedProtocol {
var wrappedValue: Value
var 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 Logged11<Value> : LoggedProtocol {
var wrappedValue: Value
var 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 Logged12<Value> : LoggedProtocol {
var wrappedValue: Value
var logger: (Event, Value) -> Void
init(wrappedValue: Value // XCTAssertEqual failed: ([]) is not equal to (["Accessing value: 0"])enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<Value> : LoggedProtocol {
private var value: Value
private let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.value = wrappedValue
self.logger = logger
}
var wrappedValue: Value {
get {
logger(.get, value)
return value
}
set {
logger(.set, newValue)
value = newValue
}
}
}
@propertyWrapper
struct Logged2<Value> : LoggedProtocol {
private var value: Value
private let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.value = wrappedValue
self.logger = logger
}
var wrappedValue: Value {
get {
logger(.get, value)
return value
}
set {
logger(.set, newValue)
value = newValue
}
}
}
@propertyWrapper
struct Logged3<Value> : LoggedProtocol {
private var value: Value
private let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.value = wrappedValue
self.logger = logger
}
var wrappedValue: Value {
get {
logger(.get, value)
return value
}
set {
logger(.set, newValue)
value = newValue
}
}
}
@propertyWrapper
struct Logged4<Value> : LoggedProtocol {
private var value: Value
private let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.value = wrappedValue
self.logger = logger
}
var wrappedValue: Value {
get {
logger(.get, value)
return value
}
set {
logger(.set, newValue)
value = newValue
}
}
}
@propertyWrapper
struct Logged5<Value> : LoggedProtocol {
private var value: Value
private let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.value = wrappedValue
self.logger = logger
}
var wrappedValue: Value {
get {
logger(.get, value)
return value
}
set {
logger(.set, newValue)
value = newValue
}
}
}
@propertyWrapper
struct Logged6<Value> : LoggedProtocol {
private var value: Value
private let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.value = wrappedValue
self.logger = logger
}
var wrappedValue: Value {
get {
logger(.get, value)
return value
}
set {
logger(.set, newValue)
value = newValue
}
}
}
@propertyWrapper
struct Logged7<Value> : LoggedProtocol {
private var value: Value
private let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.value = wrappedValue
self.logger = logger
}
var wrappedValue: Value {
get {
logger(.get, value)
return value
}
set {
logger(.set, newValue)
value = newValue
}
}
}
@propertyWrapper
struct Logged8<Value> : LoggedProtocol {
private var value: Value
private let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.value = wrappedValue
self.logger = logger
}
var wrappedValue: Value {
get {
logger(.get, value)
return value
}
set {
logger(.set, newValue)
value = newValue
}
}
}```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 {
private var value: Value
private let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.value = wrappedValue
self.logger = logger
}
var wrappedValue: Value {
get {
logger(.get, value)
return value
}
set {
logger(.set, newValue)
value = newValue
}
}
}
// A property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged2<Value> : LoggedProtocol {
private var value: Value
private let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.value = wrappedValue
self.logger = logger
}
var wrappedValue: Value {
get {
logger(.get, value)
return value
}
set {
logger(.set, newValue)
value = newValue
}
}
}
// A property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged3<Value> : LoggedProtocol {
private var value: Value
private let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.value = wrappedValue
self.logger = logger
}
var wrappedValue: Value {
get {
logger(.get, value)
return value
}
set {
logger(.set, newValue)
value = newValue
}
}
}
// A property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged4<Value> : LoggedProtocol {
private var value: Value
private let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.value = wrappedValue
self.logger = logger
}
var wrappedValue: Value {
get {
logger(.get, value)
return value
}
set {
logger(.set, newValue)
value = newValue
}
}
}
// A property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged5<Value> : LoggedProtocol {
private var value: Value
private let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.value = wrappedValue
self.logger = logger
}
var wrappedValue: Value {
get {
logger(.get, value)
return value
}
set {
logger(.set, newValue)
value = newValue
}
}
}
// A property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged6<Value> : LoggedProtocol {
private var value: Value
private let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.value = wrappedValue
self.logger = logger
}
var wrappedValue: Value {
get {
logger(.get, value)
return value
}
set {
logger(.set, newValue)
value = newValue
}
}
}
// A property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged7<Value> : LoggedProtocol {
private var value: Value
private let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.value = wrappedValue
self.logger = logger
}
var wrappedValue: Value {
get {
logger(.get, value)
return value
}
set {
logger(.set, newValue)
value = newValue
}
}
}
// A property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged8<Value> : LoggedProtocol {
private var value: Value
private let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.value = wrappedValue
self.logger = logger
}
var wrappedValue: Value {
get {
logger(.get, value)
return value
}
set {
logger(.set, newValue)
value = newValue
}
}
}
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 = ""
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
searchBarText.append(character)
case.keyboardDeleteBackwards:
searchBarText.removeLast()
case.searchButtonPress:
do {
let forecast = try provider.forecast(for: searchBarText)
return.success(city: searchBarText, forecast: forecast)
} catch {
return.failure(city: searchBarText)
}
}
}
}
class WeatherApplicationPresenter {
private let application: WeatherApplicationProtocol
init(application: WeatherApplicationProtocol) {
self.application = application
}
func handle(action: UserAction) -> String? {
guard let feedback = application.handle(action: action) else { return nil }
switch feedback {
case.success(let city, let forecast):
return "Forecast for \(city) is \(forecast)"
case.failure(let city):
return "Could not find forecast for \(city)"
}
}
}
class WeatherApplicationViewController: UIViewController {
private let presenter: WeatherApplicationPresenter
init(presenter: WeatherApplicationPresenter) {
self.presenter = presenter
super.init(nibName: nil, bundle: nil)
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor =.white
let searchBar = UISearchBar()
searchBar.delegate = self
view.addSubview(searchBar)
searchBar.translatesAutoresizingMaskIntoConstraints = false
searchBar.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor).isActive = true
searchBar.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true
searchBar.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true
let label = UILabel()
view.addSubview(label)
label.translatesAutoresizingMaskIntoConstraints = false
label.topAnchor.constraint(equalTo: searchBar.bottomAnchor).isActive = true
label.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true
label.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true
label.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor).isActive = true
searchBar.becomeFirstResponder()
}
}
extension WeatherApplicationViewController: UISearchBarDelegate {
func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
label.text = presenter.handle(action:.keyboardCharacterSelect(searchText.last!))
}
func searchBarDeleteButtonClicked(_ searchBar: UISearchBar) {
label.text = presenter.handle(action:.keyboardDeleteBackwards)
}
func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {
label.text = presenter.handle(action:.searchButtonPress)
}
}
class WeatherApplicationViewControllerFactory {
private let presenter: WeatherApplicationPresenter
init(presenter: WeatherApplicationPresenter) {
self.presenter = presenter
}
func make() -> UIViewController {
return WeatherApplicationViewController(presenter: presenter)
}
}
class WeatherApplicationFactory {
private let presenter: WeatherApplicationPresenter
init(presenter: WeatherApplicationPresenter) {
self.presenter = presenter
}
func make() -> UIViewController {
return WeatherApplicationViewControllerFactory(presenter: presenter).make()
}
}```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 = ""
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
searchBarText.append(character)
case.keyboardDeleteBackwards:
searchBarText.removeLast()
case.searchButtonPress:
do {
let forecast = try provider.forecast(for: searchBarText)
return.success(city: searchBarText, forecast: forecast)
} catch {
return.failure(city: searchBarText)
}
}
}
}
// Weather application presenter.
// Handle application feedback to display search bar results and forecast.
class WeatherApplicationPresenter {
private let application: WeatherApplicationProtocol
init(application: WeatherApplicationProtocol) {
self.application = application
}
func handle(action: UserAction) -> String? {
guard let feedback = application.handle(action: action) else { return nil }
switch feedback {
case.success(let city, let forecast):
return "Forecast for \(city) is \(forecast)"
case.failure(let city):
return "Could not find forecast for \(city)"
}
}
}
// Weather application view controller.
// Handle user actions to display search bar results and forecast.
class WeatherApplicationViewController: UIViewController {
private let presenter: WeatherApplicationPresenter
init(presenter: WeatherApplicationPresenter) {
self.presenter = presenter
super.init(nibName: nil, bundle: nil)
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor =.white
let searchBar = UISearchBar()
searchBar.delegate = self
view.addSubview(searchBar)
searchBar.translatesAutoresizingMaskIntoConstraints = false
searchBar.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor).isActive = true
searchBar.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true
searchBar.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true
let label = UILabel()
view.addSubview(label)
label.translatesAutoresizingMaskIntoConstraints = false
label.topAnchor.constraint(equalTo: searchBar.bottomAnchor).isActive = true
label.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true
label.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true
label.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor).isActive = true
searchBar.becomeFirstResponder()
}
}
extension WeatherApplicationViewController: UISearchBarDelegate {
func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
label.text = presenter.handle(action:.keyboardCharacterSelect(searchText.last!))
}
func searchBarDeleteButtonClicked(_ searchBar: UISearchBar) {
label.text = presenter.handle(action:.keyboardDeleteBackwards)
}
func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {
label.text = presenter.handle(action:.searchButtonPress)
}
}
// Weather application.
// Handle user actions to display search bar results and forecast.
class WeatherApplicationViewControllerFactory {
private let presenter: WeatherApplicationPresenter
init(presenter: WeatherApplicationPresenter) {
self.presenter = presenter
}
func make() -> UIViewController {
return WeatherApplicationViewController(presenter: presenter)
}
}
// Weather application.
// Handle user actions to display search bar results and forecast.
class WeatherApplicationFactory {
private let presenter: WeatherApplicationPresenter
init(presenter: WeatherApplicationPresenter) {
self.presenter = presenter
}
func make() -> UIViewController {
return WeatherApplicationViewControllerFactory(presenter: presenter).make()
}
}
// Weather application.
// Handle user actions to display search bar results and forecast.
class WeatherApplicationFactory {
private let presenter: WeatherApplicationPresenter
init(presenter: WeatherApplicationPresenter) {
self.presenter = presenter
}
func make() -> UIViewController {
return WeatherApplicationViewControllerFactory(presenter: presenter).make()
}
}
// Weather application.
// Handle user actions to display search bar results and forecast.
class WeatherApplicationFactory {
private let presenter: WeatherApplicationPresenter
init(presenter: WeatherApplicationPresenter) {
self.init(provider: WeatherProvider) { // initializer requirement 'init(provider:)' can only be satisfied by a 'required' initializer in non-final class 'WeatherApplication'class WeatherApplicationViewController: UIViewController { // cannot find type 'UIViewController' 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 classview.backgroundColor =.white // '=' must have consistent whitespace on both sidesview.backgroundColor =.white // cannot find 'view' in scopelet searchBar = UISearchBar() // cannot find 'UISearchBar' in scopeview.addSubview(searchBar) // cannot find 'view' in scopesearchBar.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor).isActive = true // cannot find 'view' in scopesearchBar.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true // cannot find 'view' in scopesearchBar.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true // cannot find 'view' in scopelet label = UILabel() // cannot find 'UILabel' in scopeview.addSubview(label) // cannot find 'view' in scopelabel.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true // cannot find 'view' in scopelabel.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true // cannot find 'view' in scopelabel.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor).isActive = true // cannot find 'view' in scopeextension WeatherApplicationViewController: UISearchBarDelegate { // cannot find type 'UISearchBarDelegate' in scopefunc searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) { // cannot find type 'UISearchBar' in scopelabel.text = presenter.handle(action:.keyboardCharacterSelect(searchText.last!)) // cannot find 'label' in scopefunc searchBarDeleteButtonClicked(_ searchBar: UISearchBar) { // cannot find type 'UISearchBar' in scopelabel.text = presenter.handle(action:.keyboardDeleteBackwards) // cannot find 'label' in scopefunc searchBarSearchButtonClicked(_ searchBar: UISearchBar) { // cannot find type 'UISearchBar' in scopelabel.text = presenter.handle(action:.searchButtonPress) // cannot find 'label' in scopefunc make() -> UIViewController { // cannot find type 'UIViewController' in scopefunc make() -> UIViewController { // cannot find type 'UIViewController' 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 = ""
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
searchBarText.append(character)
case.keyboardDeleteBackwards:
searchBarText.removeLast()
case.searchButtonPress:
do {
let forecast = try provider.forecast(for: searchBarText)
return.success(city: searchBarText, forecast: forecast)
} catch {
return.failure(city: searchBarText)
}
}
}
}
class WeatherApplicationConsumer {
private let application: WeatherApplicationProtocol
init(application: WeatherApplicationProtocol) {
self.application = application
}
func handle(action: UserAction) {
guard let feedback = application.handle(action: action) else { return }
switch feedback {
case.success(let city, let forecast):
print("Forecast for \(city): \(forecast)")
case.failure(let city):
print("No 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 = ""
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
searchBarText.append(character)
case.keyboardDeleteBackwards:
searchBarText.removeLast()
case.searchButtonPress:
do {
let forecast = try provider.forecast(for: searchBarText)
return.success(city: searchBarText, forecast: forecast)
} catch {
return.failure(city: searchBarText)
}
}
}
}
// Weather application consumer.
// Handle application feedback to display results.
class WeatherApplicationConsumer {
private let application: WeatherApplicationProtocol
init(application: WeatherApplicationProtocol) {
self.application = application
}
func handle(action: UserAction) {
guard let feedback = application.handle(action: action) else { return }
switch feedback {
case.success(let city, let forecast):
print("Forecast for \(city): \(forecast)")
case.failure(let city):
print("No forecast for \(city)")
}
}
}
// Weather application consumer.
// Handle application feedback to display results.
class WeatherApplicationConsumer {
private let application: WeatherApplicationProtocol
init(application: WeatherApplicationProtocol) {
self.application = application
}
func handle(action: UserAction) {
guard let feedback = application.handle(action: action) else { return }
switch feedback {
case.success(let city, let forecast):
print("Forecast for \(city): \(forecast)")
case.failure(let city):
print("No forecast for \(city)")
}
}
}
// Weather application consumer.
// Handle application feedback to display results.
class WeatherApplicationConsumer {
private let application: WeatherApplicationProtocol
init(application: WeatherApplicationProtocol) {
self.application = application
}
func handle(action: UserAction) {
guard let feedback = application.handle(action: action) else { return }
switch feedback {
case.success(let city, let forecast):
print("Forecast for \(city): \(forecast)")
case.failure(let city):
print("No forecast for \(city)")
}
}
}
// Weather application consumer.
// Handle application feedback to display results.
class WeatherApplicationConsumer {
private let application: WeatherApplicationProtocol
init(application: WeatherApplicationProtocol) {
self.application = application
}
func handle(action: UserAction) {
guard let feedback = application.handle(action: action) else { return }
switch feedback {
case.success(let city, let forecast):
print("Forecast for \(city): \(forecast)")
case.failure(let city):
print("No forecast for \(city)")
}
}
}
// Weather application consumer.
// Handle application feedback to display results.
class WeatherApplicationConsumer {
private let application: WeatherApplicationProtocol
init(application: WeatherApplicationProtocol) {
self.application = application
}
func handle(action: UserAction) {
guard let feedback = application.handle(action: action) else { return }
switch feedback {
case.success(let city, let forecast):
print("Forecast for \(city): \(forecast)")
case.failure(let city):
print("No forecast for \(city)")
}
}
}
// Weather application consumer.
// Handle application feedback to display results.
class WeatherApplicationConsumer {
private let application: WeatherApplicationProtocol
init(application: WeatherApplicationProtocol) {
self.application = application
}
func handle(action: UserAction) {
guard let feedback = application.handle(action: action) else { return }
switch feedback {
case.success(let city, let forecast):
print("Forecast for \(city): \(forecast)")
case.failure(let city):
print("No forecast for \(city)")
}
}
}
// Weather application consumer.
// Handle application feedback to display results.
class WeatherApplicationConsumer {
private let application: WeatherApplicationProtocol
init(application: WeatherApplicationProtocol) {
self.application = application
}
func handle(action: UserAction) {
guard let feedback = application.handle(action: action) else { return }
switch feedback {
case.success(let city, let forecast):
print("Forecast for \(city): \(forecast)")
case.failure(let city):
print("No forecast for \(city)")
}
}
}
// Weather application consumer.init(provider: WeatherProvider) { // initializer requirement 'init(provider:)' can only be satisfied by a 'required' initializer in non-final class 'WeatherApplication'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: "London", forecast: "Sunny")
case.keyboardDeleteBackwards:
return.failure(city: "London")
case.searchButtonPress:
return.failure(city: "London")
}
}
}
class WeatherApplicationPresenter {
private let application: WeatherApplicationProtocol
init(application: WeatherApplicationProtocol) {
self.application = application
}
func handle(action: UserAction) {
guard let feedback = application.handle(action: action) else { return }
switch feedback {
case.success(let city, let forecast):
print("Success: \(city) - \(forecast)")
case.failure(let city):
print("Failure: \(city)")
}
}
}
class WeatherApplicationView {
private let presenter: WeatherApplicationPresenter
init(presenter: WeatherApplicationPresenter) {
self.presenter = presenter
}
func handle(action: UserAction) {
presenter.handle(action: action)
}
}
class WeatherApplicationController {
private let view: WeatherApplicationView
init(view: WeatherApplicationView) {
self.view = view
}
func handle(action: UserAction) {
view.handle(action: action)
}
}
class WeatherApplication {
private let controller: WeatherApplicationController
init(controller: WeatherApplicationController) {
self.controller = controller
}
func handle(action: UserAction) {
controller.handle(action: action)
}
}
class WeatherApplicationFactory {
static func make() -> WeatherApplication {
let provider = WeatherProviderMock()
let application = WeatherApplication(provider: provider)
let presenter = WeatherApplicationPresenter(application: application)
let view = WeatherApplicationView(presenter: presenter)
let controller = WeatherApplicationController(view: view)
return WeatherApplication(controller: controller)
}
}
class WeatherProviderMock: WeatherProvider {
func forecast(for city: String) throws -> String {
return "Sunny"
}
}```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: "London", forecast: "Sunny")
case.keyboardDeleteBackwards:
return.failure(city: "London")
case.searchButtonPress:
return.failure(city: "London")
}
}
}
// Weather application presenter.
// Handle application feedback to show results on screen.
class WeatherApplicationPresenter {
private let application: WeatherApplicationProtocol
init(application: WeatherApplicationProtocol) {
self.application = application
}
func handle(action: UserAction) {
guard let feedback = application.handle(action: action) else { return }
switch feedback {
case.success(let city, let forecast):
print("Success: \(city) - \(forecast)")
case.failure(let city):
print("Failure: \(city)")
}
}
}
// Weather application view.
// Handle user actions to send them to presenter.
class WeatherApplicationView {
private let presenter: WeatherApplicationPresenter
init(presenter: WeatherApplicationPresenter) {
self.presenter = presenter
}
func handle(action: UserAction) {
presenter.handle(action: action)
}
}
// Weather application controller.
// Handle user actions to send them to view.
class WeatherApplicationController {
private let view: WeatherApplicationView
init(view: WeatherApplicationView) {
self.view = view
}
func handle(action: UserAction) {
view.handle(action: action)
}
}
// Weather application.
// Handle user actions to send them to controller.
class WeatherApplication {
private let controller: WeatherApplicationController
init(controller: WeatherApplicationController) {
self.controller = controller
}
func handle(action: UserAction) {
controller.handle(action: action)
}
}
// Weather application factory.
// Create all application dependencies.
class WeatherApplicationFactory {
static func make() -> WeatherApplication {
let provider = WeatherProviderMock()
let application = WeatherApplication(provider: provider)
let presenter = WeatherApplicationPresenter(application: application)
let view = WeatherApplicationView(presenter: presenter)
let controller = WeatherApplicationController(view: view)
return WeatherApplication(controller: controller)
}
}
// Weather application mock.
// Mock WeatherProvider to test application.
class WeatherProviderMock: WeatherProvider {
func forecast(for city: String) throws -> String {
return "Sunny"
}
}
let application = WeatherApplicationFactory.make()
application.handle(action:.keyboardCharacterSelect("L"))
application.handle(action:.keyboardCharacterSelect("o"))
application.handle(action:.keyboardCharacterSelect("n"))
application.handle(action:.keyboardCharacterSelect("d"))
application.handle(action:.keyboardCharacterSelect("o"))
application.handle(action:.keyboardCharacterSelect("n"))
application.handle(action:.searchButtonPress)
application.handle(action:.keyboardDeleteBackwards)
application.handle(action:.keyboardDeleteBackwards)
application.handle(action:.keyboardDeleteBackwards)
application.handle(action:.keyboardDeleteBackwards)
application.handle(action:.keyboardDeleteBackwards)
application.handle(action:.keyboardDeleteBackwards)
application.handle(action:.searchButtonPress)
```case.keyboardCharacterSelect(let character): // immutable value 'character' was never used; consider replacing with '_' or removing itclass WeatherApplication { // invalid redeclaration of 'WeatherApplication'static func make() -> WeatherApplication { // 'WeatherApplication' is ambiguous for type lookup in this contextprotocol 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 = ""
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
searchBarText.append(character)
case.keyboardDeleteBackwards:
searchBarText.removeLast()
case.searchButtonPress:
do {
let forecast = try provider.forecast(for: searchBarText)
return.success(city: searchBarText, forecast: forecast)
} catch {
return.failure(city: searchBarText)
}
}
}
}
class WeatherViewController: UIViewController {
private let application: WeatherApplicationProtocol
init(application: WeatherApplicationProtocol) {
self.application = application
super.init(nibName: nil, bundle: nil)
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func viewDidLoad() {
super.viewDidLoad()
//...
}
@objc func keyboardCharacterSelect(_ sender: UIButton) {
application.handle(action:.keyboardCharacterSelect(sender.titleLabel?.text.first?? " "))
}
@objc func keyboardDeleteBackwards() {
application.handle(action:.keyboardDeleteBackwards)
}
@objc func searchButtonPress() {
application.handle(action:.searchButtonPress)
}
}
class WeatherViewModel {
private let application: WeatherApplicationProtocol
init(application: WeatherApplicationProtocol) {
self.application = application
}
func handle(feedback: ApplicationFeedback) {
switch feedback {
case.success(let city, let forecast):
//...
case.failure(let city):
//...
}
}
}
class WeatherApplicationFactory {
static func make() -> WeatherApplicationProtocol {
let provider = WeatherProvider()
let application = WeatherApplication(provider: provider)
let viewController = WeatherViewController(application: application)
let viewModel = WeatherViewModel(application: application)
viewController.viewModel = viewModel
return application
}
}```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 = ""
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
searchBarText.append(character)
case.keyboardDeleteBackwards:
searchBarText.removeLast()
case.searchButtonPress:
do {
let forecast = try provider.forecast(for: searchBarText)
return.success(city: searchBarText, forecast: forecast)
} catch {
return.failure(city: searchBarText)
}
}
}
}
// Weather application view controller.
// Handle user actions and update UI.
class WeatherViewController: UIViewController {
private let application: WeatherApplicationProtocol
init(application: WeatherApplicationProtocol) {
self.application = application
super.init(nibName: nil, bundle: nil)
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func viewDidLoad() {
super.viewDidLoad()
//...
}
@objc func keyboardCharacterSelect(_ sender: UIButton) {
application.handle(action:.keyboardCharacterSelect(sender.titleLabel?.text.first?? " "))
}
@objc func keyboardDeleteBackwards() {
application.handle(action:.keyboardDeleteBackwards)
}
@objc func searchButtonPress() {
application.handle(action:.searchButtonPress)
}
}
// Weather application view model.
// Handle application feedback and update view controller.
class WeatherViewModel {
private let application: WeatherApplicationProtocol
init(application: WeatherApplicationProtocol) {
self.application = application
}
func handle(feedback: ApplicationFeedback) {
switch feedback {
case.success(let city, let forecast):
//...
case.failure(let city):
//...
}
}
}
// Weather application factory.
// Create application and its dependencies.
class WeatherApplicationFactory {
static func make() -> WeatherApplicationProtocol {
let provider = WeatherProvider()
let application = WeatherApplication(provider: provider)
let viewController = WeatherViewController(application: application)
let viewModel = WeatherViewModel(application: application)
viewController.viewModel = viewModel
return application
}
}
```init(provider: WeatherProvider) { // initializer requirement 'init(provider:)' can only be satisfied by a 'required' initializer in non-final class 'WeatherApplication'class WeatherViewController: UIViewController { // cannot find type 'UIViewController' 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 class@objc func keyboardCharacterSelect(_ sender: UIButton) { // cannot find type 'UIButton' in scopeapplication.handle(action:.keyboardCharacterSelect(sender.titleLabel?.text.first?? " ")) // type of expression is ambiguous without a type annotationapplication.handle(action:.keyboardCharacterSelect(sender.titleLabel?.text.first?? " ")) // expected ',' separatorapplication.handle(action:.keyboardDeleteBackwards) // result of call to 'handle(action:)' is unusedapplication.handle(action:.searchButtonPress) // result of call to 'handle(action:)' is unusedcase.success(let city, let forecast): // immutable value 'city' was never used; consider replacing with '_' or removing itcase.success(let city, let forecast): // immutable value 'forecast' was never used; consider replacing with '_' or removing itcase.success(let city, let forecast): // 'case' label in a 'switch' must have at least one executable statementcase.failure(let city): // 'case' label in a 'switch' must have at least one executable statementcase.failure(let city): // immutable value 'city' was never used; consider replacing with '_' or removing itlet provider = WeatherProvider() // 'any WeatherProvider' cannot be constructed because it has no accessible initializersprotocol 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 searchText = ""
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
searchText.append(character)
case.keyboardDeleteBackwards:
searchText.removeLast()
case.searchButtonPress:
do {
let forecast = try provider.forecast(for: searchText)
return.success(city: searchText, forecast: forecast)
} catch {
return.failure(city: searchText)
}
}
}
}```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 searchText = ""
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
searchText.append(character)
case.keyboardDeleteBackwards:
searchText.removeLast()
case.searchButtonPress:
do {
let forecast = try provider.forecast(for: searchText)
return.success(city: searchText, forecast: forecast)
} catch {
return.failure(city: searchText)
}
}
}
}
// 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 searchText = ""
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
searchText.append(character)
case.keyboardDeleteBackwards:
searchText.removeLast()
case.searchButtonPress:
do {
let forecast = try provider.forecast(for: searchText)
return.success(city: searchText, forecast: forecast)
} catch {
return.failure(city: searchText)
}
}
}
}
// 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 searchText = ""
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
searchText.append(character)
case.keyboardDeleteBackwards:
searchText.removeLast()
case.searchButtonPress:
do {
let forecast = try provider.forecast(for: searchText)
return.success(city: searchText, forecast: forecast)
} catch {
return.failure(city: searchText)
}
}
}
}
// 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 searchText = ""
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
searchText.append(character)
case.keyboardDeleteBackwards:
searchText.removeLast()
case.searchButtonPress:
do {
let forecast = try provider.forecast(for: searchText)
return.success(city: searchText, forecast: forecast)
} catch {
return.failure(city: searchText)
}
}
}
}
// 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 searchText = ""
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
searchText.append(character)
case.keyboardDeleteBackwards:
searchText.removeLast()
case.searchButtonPress:
do {
let forecast = try provider.forecast(for: searchText)
return.success(city: searchText, forecast: forecast)
} catch {
return.failure(city: searchText)
}
}
}
}
// 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 searchText = ""
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
searchText.append(character)
case.keyboardDeleteBackwards:
searchText.removeLast()
case.searchButtonPress:
do {
let forecast = try provider.forecast(for: searchText)
return.success(city: searchText, forecast: forecast)
} catch {
return.failure(city: searchText)
}
}
}
}
init(provider: WeatherProvider) { // initializer requirement 'init(provider:)' can only be satisfied by a 'required' initializer in non-final class 'WeatherApplication'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 searchText = ""
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
searchText.append(character)
case.keyboardDeleteBackwards:
searchText.removeLast()
case.searchButtonPress:
do {
let forecast = try provider.forecast(for: searchText)
return.success(city: searchText, forecast: forecast)
} catch {
return.failure(city: searchText)
}
}
return nil
}
}
class WeatherApplicationPresenter {
private let application: WeatherApplicationProtocol
init(application: WeatherApplicationProtocol) {
self.application = application
}
func handle(action: UserAction) {
guard let feedback = application.handle(action: action) else { return }
switch feedback {
case.success(let city, let forecast):
print("Forecast for \(city): \(forecast)")
case.failure(let city):
print("Failed to get forecast for \(city)")
}
}
}
class WeatherApplicationView {
private let presenter: WeatherApplicationPresenter
init(presenter: WeatherApplicationPresenter) {
self.presenter = presenter
}
func handle(action: UserAction) {
presenter.handle(action: action)
}
}
class WeatherApplicationController {
private let view: WeatherApplicationView
private let presenter: WeatherApplicationPresenter
init(view: WeatherApplicationView, presenter: WeatherApplicationPresenter) {
self.view = view
self.presenter = presenter
}
func handle(action: UserAction) {
view.handle(action: action)
}
}
class WeatherApplication {
private let controller: WeatherApplicationController
init(controller: WeatherApplicationController) {
self.controller = controller
}
func handle(action: UserAction) {
controller.handle(action: action)
}
}
class WeatherApplicationDependencies {
private let application: WeatherApplicationProtocol
private let presenter: WeatherApplicationPresenter
private let view: WeatherApplicationView
private let controller: WeatherApplicationController
init(provider: WeatherProvider) {
application = WeatherApplication(provider: provider)
presenter = WeatherApplicationPresenter(application: application)
view = WeatherApplicationView(presenter: presenter)
controller = WeatherApplicationController(view: view, presenter: presenter)
}
func makeApplication() -> WeatherApplication {
return WeatherApplication(controller: controller)
}
}
class WeatherApplicationFactory {
private let dependencies: WeatherApplicationDependencies
init(dependencies: WeatherApplicationDependencies) {
self.dependencies = dependencies
}
func makeApplication() -> WeatherApplication {
return dependencies.makeApplication()
}
}
class WeatherApplicationBuilder {
private let factory: WeatherApplicationFactory
init(factory: WeatherApplicationFactory) {
self.factory = factory
}
func build() -> WeatherApplication {
return factory.makeApplication()
}
}
class WeatherApplicationBuilderFactory {
private let builder: WeatherApplicationBuilder
init(builder: WeatherApplicationBuilder) {
self.builder = builder
}
func makeBuilder() -> WeatherApplicationBuilder {
return builder
}
}
class WeatherApplicationBuilderFactoryBuilder {
private let factory: WeatherApplicationBuilderFactory
init(factory: WeatherApplicationBuilderFactory) {
self.factory = factory
}
func build() -> WeatherApplicationBuilderFactory {
return factory
}
}
class WeatherApplicationBuilderFactoryBuilderFactory {
private let builder: WeatherApplicationBuilderFactoryBuilder
init(builder: WeatherApplicationBuilderFactoryBuilder) {
self.builder = builder
}
func makeBuilder() -> WeatherApplicationBuilderFactoryBuilder {
return builder
}
}```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 searchText = ""
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
searchText.append(character)
case.keyboardDeleteBackwards:
searchText.removeLast()
case.searchButtonPress:
do {
let forecast = try provider.forecast(for: searchText)
return.success(city: searchText, forecast: forecast)
} catch {
return.failure(city: searchText)
}
}
return nil
}
}
// Weather application presenter.
// Handle application feedback to show results.
class WeatherApplicationPresenter {
private let application: WeatherApplicationProtocol
init(application: WeatherApplicationProtocol) {
self.application = application
}
func handle(action: UserAction) {
guard let feedback = application.handle(action: action) else { return }
switch feedback {
case.success(let city, let forecast):
print("Forecast for \(city): \(forecast)")
case.failure(let city):
print("Failed to get forecast for \(city)")
}
}
}
// Weather application view.
// Handle user actions to update search bar.
class WeatherApplicationView {
private let presenter: WeatherApplicationPresenter
init(presenter: WeatherApplicationPresenter) {
self.presenter = presenter
}
func handle(action: UserAction) {
presenter.handle(action: action)
}
}
// Weather application controller.
// Handle user actions to update search bar and show results.
class WeatherApplicationController {
private let view: WeatherApplicationView
private let presenter: WeatherApplicationPresenter
init(view: WeatherApplicationView, presenter: WeatherApplicationPresenter) {
self.view = view
self.presenter = presenter
}
func handle(action: UserAction) {
view.handle(action: action)
}
}
// Weather application.
// Handle user actions to update search bar, show results and get forecast.
class WeatherApplication {
private let controller: WeatherApplicationController
init(controller: WeatherApplicationController) {
self.controller = controller
}
func handle(action: UserAction) {
controller.handle(action: action)
}
}
// Weather application dependencies.
// Handle application dependencies.
class WeatherApplicationDependencies {
private let application: WeatherApplicationProtocol
private let presenter: WeatherApplicationPresenter
private let view: WeatherApplicationView
private let controller: WeatherApplicationController
init(provider: WeatherProvider) {
application = WeatherApplication(provider: provider)
presenter = WeatherApplicationPresenter(application: application)
view = WeatherApplicationView(presenter: presenter)
controller = WeatherApplicationController(view: view, presenter: presenter)
}
func makeApplication() -> WeatherApplication {
return WeatherApplication(controller: controller)
}
}
// Weather application factory.
// Handle application factory.
class WeatherApplicationFactory {
private let dependencies: WeatherApplicationDependencies
init(dependencies: WeatherApplicationDependencies) {
self.dependencies = dependencies
}
func makeApplication() -> WeatherApplication {
return dependencies.makeApplication()
}
}
// Weather application builder.
// Handle application builder.
class WeatherApplicationBuilder {
private let factory: WeatherApplicationFactory
init(factory: WeatherApplicationFactory) {
self.factory = factory
}
func build() -> WeatherApplication {
return factory.makeApplication()
}
}
// Weather application builder factory.
// Handle application builder factory.
class WeatherApplicationBuilderFactory {
private let builder: WeatherApplicationBuilder
init(builder: WeatherApplicationBuilder) {
self.builder = builder
}
func makeBuilder() -> WeatherApplicationBuilder {
return builder
}
}
// Weather application builder factory builder.
// Handle application builder factory builder.
class WeatherApplicationBuilderFactoryBuilder {
private let factory: WeatherApplicationBuilderFactory
init(factory: WeatherApplicationBuilderFactory) {
self.factory = factory
}
func build() -> WeatherApplicationBuilderFactory {
return factory
}
}
// Weather application builder factory builder factory.
// Handle application builder factory builder factory.
class WeatherApplicationBuilderFactoryBuilderFactory {
private let builder: WeatherApplicationBuilderFactoryBuilder
init(builder: WeatherApplicationBuilderFactoryBuilder) {
self.builder = builder
}
func makeBuilder() -> WeatherApplicationBuilderFactoryBuilder {
return builder
}
}
// Weather application builder factory builder factory builder.
// Handle application builder factory builder factory builder.
class WeatherApplicationBuilderFactoryBuilderFactoryBuilder {
private let factory: WeatherApplicationBuilderFactoryBuilderFactory
init(factory: WeatherApplicationBuilderFactoryBuilderFactorytypealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions // 'WeatherApplicationDependencies' is ambiguous for type lookup in this contextclass WeatherApplication { // invalid redeclaration of 'WeatherApplication'class WeatherApplicationDependencies { // invalid redeclaration of 'WeatherApplicationDependencies'func makeApplication() -> WeatherApplication { // 'WeatherApplication' is ambiguous for type lookup in this contextprivate let dependencies: WeatherApplicationDependencies // 'WeatherApplicationDependencies' is ambiguous for type lookup in this contextinit(dependencies: WeatherApplicationDependencies) { // 'WeatherApplicationDependencies' is ambiguous for type lookup in this contextfunc makeApplication() -> WeatherApplication { // 'WeatherApplication' is ambiguous for type lookup in this contextfunc build() -> WeatherApplication { // 'WeatherApplication' is ambiguous for type lookup in this contextprotocol 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 = ""
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
searchBarText.append(character)
case.keyboardDeleteBackwards:
searchBarText.removeLast()
case.searchButtonPress:
return searchForecast()
}
return nil
}
private func searchForecast() -> ApplicationFeedback? {
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 = ""
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
searchBarText.append(character)
case.keyboardDeleteBackwards:
searchBarText.removeLast()
case.searchButtonPress:
return searchForecast()
}
return nil
}
private func searchForecast() -> ApplicationFeedback? {
do {
let forecast = try provider.forecast(for: searchBarText)
return.success(city: searchBarText, forecast: forecast)
} catch {
return.failure(city: searchBarText)
}
}
}
```init(provider: WeatherProvider) { // initializer requirement 'init(provider:)' can only be satisfied by a 'required' initializer in non-final class 'WeatherApplication'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
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
searchBar.append(character)
case.keyboardDeleteBackwards:
searchBar.deleteLastCharacter()
case.searchButtonPress:
guard let city = searchBar.text else { return nil }
do {
let forecast = try provider.forecast(for: city)
return.success(city: city, forecast: forecast)
} catch {
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
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
searchBar.append(character)
case.keyboardDeleteBackwards:
searchBar.deleteLastCharacter()
case.searchButtonPress:
guard let city = searchBar.text else { return nil }
do {
let forecast = try provider.forecast(for: city)
return.success(city: city, forecast: forecast)
} catch {
return.failure(city: city)
}
}
}
}
// Weather application dependencies.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
searchBar.append(character)
case.keyboardDeleteBackwards:
searchBar.deleteLastCharacter()
case.searchButtonPress:
guard let city = searchBar.text else { return nil }
do {
let forecast = try provider.forecast(for: city)
return.success(city: city, forecast: forecast)
} catch {
return.failure(city: city)
}
}
}
}
```init(provider: WeatherProvider) { // initializer requirement 'init(provider:)' can only be satisfied by a 'required' initializer in non-final class 'WeatherApplication'searchBar.append(character) // cannot find 'searchBar' in scopesearchBar.deleteLastCharacter() // cannot find 'searchBar' in scopeguard let city = searchBar.text else { return nil } // cannot find 'searchBar' 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 = ""
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
searchBarText.append(character)
case.keyboardDeleteBackwards:
searchBarText.removeLast()
case.searchButtonPress:
do {
let forecast = try provider.forecast(for: searchBarText)
return.success(city: searchBarText, forecast: forecast)
} catch {
return.failure(city: searchBarText)
}
}
}
}
class WeatherApplicationPresenter {
private let application: WeatherApplicationProtocol
init(application: WeatherApplicationProtocol) {
self.application = application
}
func handle(action: UserAction) -> String? {
guard let feedback = application.handle(action: action) else { return nil }
switch feedback {
case.success(let city, let forecast):
return "The weather in \(city) is \(forecast)"
case.failure(let city):
return "Could not find weather for \(city)"
}
}
}
class WeatherApplicationViewController: UIViewController {
private let presenter: WeatherApplicationPresenter
init(presenter: WeatherApplicationPresenter) {
self.presenter = presenter
super.init(nibName: nil, bundle: nil)
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor =.white
let searchBar = UISearchBar()
searchBar.delegate = self
view.addSubview(searchBar)
searchBar.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([
searchBar.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor),
searchBar.leadingAnchor.constraint(equalTo: view.leadingAnchor),
searchBar.trailingAnchor.constraint(equalTo: view.trailingAnchor),
])
}
}
extension WeatherApplicationViewController: UISearchBarDelegate {
func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {
guard let text = searchBar.text else { return }
let action = UserAction.keyboardCharacterSelect(contentsOf: text)
if let feedback = presenter.handle(action: action) {
let alert = UIAlertController(title: nil, message: feedback, preferredStyle:.alert)
alert.addAction(UIAlertAction(title: "OK", style:.default, handler: nil))
present(alert, animated: true, completion: nil)
}
}
func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
let action = UserAction.keyboardCharacterSelect(contentsOf: searchText)
if let feedback = presenter.handle(action: action) {
let alert = UIAlertController(title: nil, message: feedback, preferredStyle:.alert)
alert.addAction(UIAlertAction(title: "OK", style:.default, handler: nil))
present(alert, animated: true, completion: nil)
}
}
func searchBar(_ searchBar: UISearchBar, shouldChangeTextIn range: NSRange, replacementText text: String) -> Bool {
if text.isEmpty {
let action = UserAction.keyboardDeleteBackwards
if let feedback = presenter.handle(action: action) {
let alert = UIAlertController(title: nil, message: feedback, preferredStyle:.alert)
alert.addAction(UIAlertAction(title: "OK", style:.default, handler: nil))
present(alert, animated: true, completion: nil)
}
}
return true
}
}
class WeatherApplicationFactory {
static func make() -> UIViewController {
let provider = WeatherProvider()
let application = WeatherApplication(provider: provider)
let presenter = WeatherApplicationPresenter(application: application)
return WeatherApplicationViewController(presenter: presenter)
}
}```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 = ""
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
searchBarText.append(character)
case.keyboardDeleteBackwards:
searchBarText.removeLast()
case.searchButtonPress:
do {
let forecast = try provider.forecast(for: searchBarText)
return.success(city: searchBarText, forecast: forecast)
} catch {
return.failure(city: searchBarText)
}
}
}
}
// Weather application presenter.
// Handle application feedback to display results.
class WeatherApplicationPresenter {
private let application: WeatherApplicationProtocol
init(application: WeatherApplicationProtocol) {
self.application = application
}
func handle(action: UserAction) -> String? {
guard let feedback = application.handle(action: action) else { return nil }
switch feedback {
case.success(let city, let forecast):
return "The weather in \(city) is \(forecast)"
case.failure(let city):
return "Could not find weather for \(city)"
}
}
}
// Weather application view controller.
// Handle user actions to display results.
class WeatherApplicationViewController: UIViewController {
private let presenter: WeatherApplicationPresenter
init(presenter: WeatherApplicationPresenter) {
self.presenter = presenter
super.init(nibName: nil, bundle: nil)
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor =.white
let searchBar = UISearchBar()
searchBar.delegate = self
view.addSubview(searchBar)
searchBar.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([
searchBar.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor),
searchBar.leadingAnchor.constraint(equalTo: view.leadingAnchor),
searchBar.trailingAnchor.constraint(equalTo: view.trailingAnchor),
])
}
}
extension WeatherApplicationViewController: UISearchBarDelegate {
func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {
guard let text = searchBar.text else { return }
let action = UserAction.keyboardCharacterSelect(contentsOf: text)
if let feedback = presenter.handle(action: action) {
let alert = UIAlertController(title: nil, message: feedback, preferredStyle:.alert)
alert.addAction(UIAlertAction(title: "OK", style:.default, handler: nil))
present(alert, animated: true, completion: nil)
}
}
func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
let action = UserAction.keyboardCharacterSelect(contentsOf: searchText)
if let feedback = presenter.handle(action: action) {
let alert = UIAlertController(title: nil, message: feedback, preferredStyle:.alert)
alert.addAction(UIAlertAction(title: "OK", style:.default, handler: nil))
present(alert, animated: true, completion: nil)
}
}
func searchBar(_ searchBar: UISearchBar, shouldChangeTextIn range: NSRange, replacementText text: String) -> Bool {
if text.isEmpty {
let action = UserAction.keyboardDeleteBackwards
if let feedback = presenter.handle(action: action) {
let alert = UIAlertController(title: nil, message: feedback, preferredStyle:.alert)
alert.addAction(UIAlertAction(title: "OK", style:.default, handler: nil))
present(alert, animated: true, completion: nil)
}
}
return true
}
}
// Weather application factory.
// Create all application components.
class WeatherApplicationFactory {
static func make() -> UIViewController {
let provider = WeatherProvider()
let application = WeatherApplication(provider: provider)
let presenter = WeatherApplicationPresenter(application: application)
return WeatherApplicationViewController(presenter: presenter)
}
}
// Weather provider.
// Get weather forecast from OpenWeatherMap.
class WeatherProvider: WeatherApplicationDependencies {
private let apiKey = ""
init() { }
func forecast(for city: String) throws -> String {
let url = URL(string: "https://api.openweathermap.org/data/2.init(provider: WeatherProvider) { // initializer requirement 'init(provider:)' can only be satisfied by a 'required' initializer in non-final class 'WeatherApplication'class WeatherApplicationViewController: UIViewController { // cannot find type 'UIViewController' 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 classview.backgroundColor =.white // '=' must have consistent whitespace on both sidesview.backgroundColor =.white // cannot find 'view' in scopelet searchBar = UISearchBar() // cannot find 'UISearchBar' in scopeview.addSubview(searchBar) // cannot find 'view' in scopeNSLayoutConstraint.activate([ // cannot find 'NSLayoutConstraint' in scopesearchBar.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor), // cannot find 'view' in scopesearchBar.leadingAnchor.constraint(equalTo: view.leadingAnchor), // cannot find 'view' in scopesearchBar.trailingAnchor.constraint(equalTo: view.trailingAnchor), // cannot find 'view' in scopeextension WeatherApplicationViewController: UISearchBarDelegate { // cannot find type 'UISearchBarDelegate' in scopefunc searchBarSearchButtonClicked(_ searchBar: UISearchBar) { // cannot find type 'UISearchBar' in scopelet action = UserAction.keyboardCharacterSelect(contentsOf: text) // extraneous argument label 'contentsOf:' in calllet alert = UIAlertController(title: nil, message: feedback, preferredStyle:.alert) // 'nil' requires a contextual typelet alert = UIAlertController(title: nil, message: feedback, preferredStyle:.alert) // cannot infer contextual base in reference to member 'alert'let alert = UIAlertController(title: nil, message: feedback, preferredStyle:.alert) // cannot find 'UIAlertController' in scopealert.addAction(UIAlertAction(title: "OK", style:.default, handler: nil)) // cannot find 'UIAlertAction' in scopealert.addAction(UIAlertAction(title: "OK", style:.default, handler: nil)) // cannot infer contextual base in reference to member 'default'alert.addAction(UIAlertAction(title: "OK", style:.default, handler: nil)) // 'nil' requires a contextual typepresent(alert, animated: true, completion: nil) // 'nil' requires a contextual typepresent(alert, animated: true, completion: nil) // cannot find 'present' in scopefunc searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) { // cannot find type 'UISearchBar' in scopelet action = UserAction.keyboardCharacterSelect(contentsOf: searchText) // cannot convert value of type 'String' to expected argument type 'Character'let action = UserAction.keyboardCharacterSelect(contentsOf: searchText) // extraneous argument label 'contentsOf:' in calllet alert = UIAlertController(title: nil, message: feedback, preferredStyle:.alert) // cannot find 'UIAlertController' in scopelet alert = UIAlertController(title: nil, message: feedback, preferredStyle:.alert) // 'nil' requires a contextual typelet alert = UIAlertController(title: nil, message: feedback, preferredStyle:.alert) // cannot infer contextual base in reference to member 'alert'alert.addAction(UIAlertAction(title: "OK", style:.default, handler: nil)) // cannot infer contextual base in reference to member 'default'alert.addAction(UIAlertAction(title: "OK", style:.default, handler: nil)) // cannot find 'UIAlertAction' in scopealert.addAction(UIAlertAction(title: "OK", style:.default, handler: nil)) // 'nil' requires a contextual typepresent(alert, animated: true, completion: nil) // 'nil' requires a contextual typepresent(alert, animated: true, completion: nil) // cannot find 'present' in scopefunc searchBar(_ searchBar: UISearchBar, shouldChangeTextIn range: NSRange, replacementText text: String) -> Bool { // cannot find type 'UISearchBar' in scopelet alert = UIAlertController(title: nil, message: feedback, preferredStyle:.alert) // cannot infer contextual base in reference to member 'alert'let alert = UIAlertController(title: nil, message: feedback, preferredStyle:.alert) // 'nil' requires a contextual typelet alert = UIAlertController(title: nil, message: feedback, preferredStyle:.alert) // cannot find 'UIAlertController' in scopealert.addAction(UIAlertAction(title: "OK", style:.default, handler: nil)) // 'nil' requires a contextual typealert.addAction(UIAlertAction(title: "OK", style:.default, handler: nil)) // cannot infer contextual base in reference to member 'default'alert.addAction(UIAlertAction(title: "OK", style:.default, handler: nil)) // cannot find 'UIAlertAction' in scopepresent(alert, animated: true, completion: nil) // 'nil' requires a contextual typepresent(alert, animated: true, completion: nil) // cannot find 'present' in scopestatic func make() -> UIViewController { // cannot find type 'UIViewController' in scopelet provider = WeatherProvider() // 'any WeatherProvider' cannot be constructed because it has no accessible initializersprotocol 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 = ""
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
searchBarText.append(character)
case.keyboardDeleteBackwards:
searchBarText.removeLast()
case.searchButtonPress:
do {
let forecast = try provider.forecast(for: searchBarText)
return.success(city: searchBarText, forecast: forecast)
} catch {
return.failure(city: searchBarText)
}
}
}
}
class WeatherApplicationView: UIView {
private let application: WeatherApplicationProtocol
init(application: WeatherApplicationProtocol) {
self.application = application
super.init(frame:.zero)
}
@objc private func handleKeyboardCharacterSelect(_ sender: UIButton) {
guard let character = sender.titleLabel?.text?.first else { return }
application.handle(action:.keyboardCharacterSelect(character))
}
@objc private func handleKeyboardDeleteBackwards() {
application.handle(action:.keyboardDeleteBackwards)
}
@objc private func handleSearchButtonPress() {
application.handle(action:.searchButtonPress)
}
func display(_ feedback: ApplicationFeedback) {
switch feedback {
case.success(let city, let forecast):
print("Forecast for \(city): \(forecast)")
case.failure(let city):
print("No forecast for \(city)")
}
}
}
class WeatherApplicationViewController: UIViewController {
private let application: WeatherApplicationProtocol
init(application: WeatherApplicationProtocol) {
self.application = application
super.init(nibName: nil, bundle: nil)
}
@objc private func handleKeyboardCharacterSelect(_ sender: UIButton) {
guard let character = sender.titleLabel?.text?.first else { return }
application.handle(action:.keyboardCharacterSelect(character))
}
@objc private func handleKeyboardDeleteBackwards() {
application.handle(action:.keyboardDeleteBackwards)
}
@objc private func handleSearchButtonPress() {
application.handle(action:.searchButtonPress)
}
func display(_ feedback: ApplicationFeedback) {
switch feedback {
case.success(let city, let forecast):
print("Forecast for \(city): \(forecast)")
case.failure(let city):
print("No 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 = ""
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
searchBarText.append(character)
case.keyboardDeleteBackwards:
searchBarText.removeLast()
case.searchButtonPress:
do {
let forecast = try provider.forecast(for: searchBarText)
return.success(city: searchBarText, forecast: forecast)
} catch {
return.failure(city: searchBarText)
}
}
}
}
// Weather application view.
// Handle user actions and display application feedback.
class WeatherApplicationView: UIView {
private let application: WeatherApplicationProtocol
init(application: WeatherApplicationProtocol) {
self.application = application
super.init(frame:.zero)
}
@objc private func handleKeyboardCharacterSelect(_ sender: UIButton) {
guard let character = sender.titleLabel?.text?.first else { return }
application.handle(action:.keyboardCharacterSelect(character))
}
@objc private func handleKeyboardDeleteBackwards() {
application.handle(action:.keyboardDeleteBackwards)
}
@objc private func handleSearchButtonPress() {
application.handle(action:.searchButtonPress)
}
func display(_ feedback: ApplicationFeedback) {
switch feedback {
case.success(let city, let forecast):
print("Forecast for \(city): \(forecast)")
case.failure(let city):
print("No forecast for \(city)")
}
}
}
// Weather application view controller.
// Handle user actions and display application feedback.
class WeatherApplicationViewController: UIViewController {
private let application: WeatherApplicationProtocol
init(application: WeatherApplicationProtocol) {
self.application = application
super.init(nibName: nil, bundle: nil)
}
@objc private func handleKeyboardCharacterSelect(_ sender: UIButton) {
guard let character = sender.titleLabel?.text?.first else { return }
application.handle(action:.keyboardCharacterSelect(character))
}
@objc private func handleKeyboardDeleteBackwards() {
application.handle(action:.keyboardDeleteBackwards)
}
@objc private func handleSearchButtonPress() {
application.handle(action:.searchButtonPress)
}
func display(_ feedback: ApplicationFeedback) {
switch feedback {
case.success(let city, let forecast):
print("Forecast for \(city): \(forecast)")
case.failure(let city):
print("No forecast for \(city)")
}
}
}
// Weather application view controller.
// Handle user actions and display application feedback.
class WeatherApplicationViewController: UIViewController {
private let application: WeatherApplicationProtocol
init(application: WeatherApplicationProtocol) {
self.application = application
super.init(nibName: nil, bundle: nil)
}
@objc private func handleKeyboardCharacterSelect(_ sender: UIButton) {
guard let character = sender.titleLabel?.text?.first else { return }
application.handle(action:.keyboardCharacterSelect(character))
}
@objc private func handleKeyboardDeleteBackwards() {
application.handle(action:.keyboardDeleteBackwards)
}
@objc private func handleSearchButtonPress() {
application.handle(action:.searchButtonPress)
}
func display(_ feedback: ApplicationFeedback) {
switch feedback {
case.success(let city, let forecast):
print("Forecast for \(city): \(forecast)")
case.failure(let city):
print("No forecast for \(city)")
}
}
}
```init(provider: WeatherProvider) { // initializer requirement 'init(provider:)' can only be satisfied by a 'required' initializer in non-final class 'WeatherApplication'class WeatherApplicationView: UIView { // cannot find type 'UIView' in scopesuper.init(frame:.zero) // 'super' members cannot be referenced in a root class@objc private func handleKeyboardCharacterSelect(_ sender: UIButton) { // cannot find type 'UIButton' in scopeapplication.handle(action:.keyboardDeleteBackwards) // result of call to 'handle(action:)' is unusedapplication.handle(action:.searchButtonPress) // result of call to 'handle(action:)' is unusedclass WeatherApplicationViewController: UIViewController { // cannot find type 'UIViewController' in scopesuper.init(nibName: nil, bundle: nil) // 'super' members cannot be referenced in a root class@objc private func handleKeyboardCharacterSelect(_ sender: UIButton) { // cannot find type 'UIButton' in scopeapplication.handle(action:.keyboardDeleteBackwards) // result of call to 'handle(action:)' is unusedapplication.handle(action:.searchButtonPress) // result of call to 'handle(action:)' is unusedprotocol 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 {
return 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 {
return 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'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 {
balance
}
func deposit(amount: Double) async {
balance += amount
}
func withdraw(amount: Double) async -> Bool {
if balance >= amount {
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 {
balance
}
func deposit(amount: Double) async {
balance += amount
}
func withdraw(amount: Double) async -> Bool {
if balance >= amount {
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'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 {
balance
}
func deposit(amount: Double) async {
balance += amount
}
func withdraw(amount: Double) async -> Bool {
guard balance >= amount else {
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 {
balance
}
func deposit(amount: Double) async {
balance += amount
}
func withdraw(amount: Double) async -> Bool {
guard balance >= amount else {
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'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 {
return balance
}
func deposit(amount: Double) async {
balance += amount
}
func withdraw(amount: Double) async -> Bool {
if balance >= amount {
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 {
return balance
}
func deposit(amount: Double) async {
balance += amount
}
func withdraw(amount: Double) async -> Bool {
if balance >= amount {
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'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 {
balance
}
func deposit(amount: Double) async {
balance += amount
}
func withdraw(amount: Double) async -> Bool {
if balance >= amount {
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 {
balance
}
func deposit(amount: Double) async {
balance += amount
}
func withdraw(amount: Double) async -> Bool {
if balance >= amount {
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'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 {
return balance
}
func deposit(amount: Double) async {
balance += amount
}
func withdraw(amount: Double) async -> Bool {
if balance >= amount {
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 {
return balance
}
func deposit(amount: Double) async {
balance += amount
}
func withdraw(amount: Double) async -> Bool {
if balance >= amount {
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'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 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 {
return 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
}
}
}
```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 _balance
}
}
func deposit(amount: Double) async {
_balance += amount
}
func withdraw(amount: Double) async -> Bool {
guard _balance >= amount else {
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 {
return _balance
}
}
func deposit(amount: Double) async {
_balance += amount
}
func withdraw(amount: Double) async -> Bool {
guard _balance >= amount else {
return false
}
_balance -= amount
return true
}
}
```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 {
return _balance
}
func deposit(amount: Double) async {
_balance += amount
}
func withdraw(amount: Double) async -> Bool {
if _balance >= amount {
_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 {
return _balance
}
func deposit(amount: Double) async {
_balance += amount
}
func withdraw(amount: Double) async -> Bool {
if _balance >= amount {
_balance -= amount
return true
} else {
return false
}
}
}
```protocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
actor BankAccount: BankAccountProtocol {
var balance: Double
init(balance: Double) {
self.balance = balance
}
func deposit(amount: Double) async {
balance += amount
}
func withdraw(amount: Double) async -> Bool {
if balance >= amount {
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 {
var balance: Double
init(balance: Double) {
self.balance = balance
}
func deposit(amount: Double) async {
balance += amount
}
func withdraw(amount: Double) async -> Bool {
if balance >= amount {
balance -= amount
return true
} else {
return false
}
}
}
```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.wrappedValue = wrappedValue
self.condition = condition
}
var wrappedValue: Value {
mutating get {
if value == nil || 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 var value: Value?
private let condition: () -> Bool
private let wrappedValue: () -> Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.wrappedValue = wrappedValue
self.condition = condition
}
var wrappedValue: Value {
mutating get {
if value == nil || condition() {
value = wrappedValue()
}
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'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.wrappedValue = wrappedValue
self.condition = condition
}
var wrappedValue: Value {
mutating get {
if _value == nil || 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 var _value: Value?
private let condition: () -> Bool
private let wrappedValue: () -> Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.wrappedValue = wrappedValue
self.condition = condition
}
var wrappedValue: Value {
mutating get {
if _value == nil || condition() {
_value = wrappedValue()
}
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'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.wrappedValue = wrappedValue
self.condition = condition
}
var wrappedValue: Value {
mutating get {
if value == nil || 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 var value: Value?
private let condition: () -> Bool
private let wrappedValue: () -> Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.wrappedValue = wrappedValue
self.condition = condition
}
var wrappedValue: Value {
mutating get {
if value == nil || condition() {
value = wrappedValue()
}
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'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.wrappedValue = wrappedValue
self.condition = condition
}
var wrappedValue: Value {
mutating get {
if value == nil || 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 value: Value?
private let condition: () -> Bool
private let wrappedValue: () -> Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.wrappedValue = wrappedValue
self.condition = condition
}
var wrappedValue: Value {
mutating get {
if value == nil || condition() {
value = wrappedValue()
}
return value!
}
}
}
```struct Cached<Value>: CachedProperty { // property wrapper type 'Cached' has multiple non-static properties named 'wrappedValue'var wrappedValue: Value { // invalid redeclaration of 'wrappedValue'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.wrappedValue = wrappedValue
self.condition = condition
}
var wrappedValue: Value {
mutating get {
if value == nil || condition() {
value = wrappedValue()
}
return value!
}
}
}
@propertyWrapper
struct CachedWhenChanged<Value>: CachedProperty {
private var value: Value?
private let wrappedValue: () -> Value
init(wrappedValue: @autoclosure @escaping () -> Value) {
self.wrappedValue = wrappedValue
}
var wrappedValue: Value {
mutating get {
if value == nil || value!= wrappedValue() {
value = wrappedValue()
}
return value!
}
}
}
@propertyWrapper
struct CachedWhenIdentical<Value: AnyObject>: CachedProperty {
private var value: Value?
private let wrappedValue: () -> Value
init(wrappedValue: @autoclosure @escaping () -> Value) {
self.wrappedValue = wrappedValue
}
var wrappedValue: Value {
mutating get {
if value == nil || value!== wrappedValue() {
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 value: Value?
private let condition: () -> Bool
private let wrappedValue: () -> Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.wrappedValue = wrappedValue
self.condition = condition
}
var wrappedValue: Value {
mutating get {
if value == nil || condition() {
value = wrappedValue()
}
return value!
}
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when the property's value changes.
@propertyWrapper
struct CachedWhenChanged<Value>: CachedProperty {
private var value: Value?
private let wrappedValue: () -> Value
init(wrappedValue: @autoclosure @escaping () -> Value) {
self.wrappedValue = wrappedValue
}
var wrappedValue: Value {
mutating get {
if value == nil || value!= wrappedValue() {
value = wrappedValue()
}
return value!
}
}
}
// Property wrapper that caches the computed value of a property and recomputes it only when the property's value changes.
@propertyWrapper
struct CachedWhenIdentical<Value: AnyObject>: CachedProperty {
private var value: Value?
private let wrappedValue: () -> Value
init(wrappedValue: @autoclosure @escaping () -> Value) {
self.wrappedValue = wrappedValue
}
var wrappedValue: Value {
mutating get {
if value == nil || value!== wrappedValue() {
value = wrappedValue()
}
return value!
}
}
}
```struct Cached<Value>: CachedProperty { // property wrapper type 'Cached' has multiple non-static properties named 'wrappedValue'var wrappedValue: Value { // invalid redeclaration of 'wrappedValue'struct CachedWhenChanged<Value>: CachedProperty { // property wrapper type 'CachedWhenChanged' has multiple non-static properties named 'wrappedValue'struct CachedWhenChanged<Value>: CachedProperty { // type 'CachedWhenChanged<Value>' does not conform to protocol 'CachedProperty'var wrappedValue: Value { // invalid redeclaration of 'wrappedValue'if value == nil || value!= wrappedValue() { // use of '=' in a boolean context, did you mean '=='?if value == nil || value!= wrappedValue() { // cannot convert value of type 'Value' to expected argument type 'Bool'if value == nil || value!= wrappedValue() { // '=' must have consistent whitespace on both sidesstruct CachedWhenIdentical<Value: AnyObject>: CachedProperty { // type 'CachedWhenIdentical<Value>' does not conform to protocol 'CachedProperty'struct CachedWhenIdentical<Value: AnyObject>: CachedProperty { // property wrapper type 'CachedWhenIdentical' has multiple non-static properties named 'wrappedValue'var wrappedValue: Value { // invalid redeclaration of 'wrappedValue'if value == nil || value!== wrappedValue() { // expected '{' after 'if' conditionif value == nil || value!== wrappedValue() { // '==' is not a postfix unary operatorprotocol 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.wrappedValue = wrappedValue
self.condition = condition
}
var wrappedValue: Value {
mutating get {
if value == nil || condition() {
value = wrappedValue()
}
return value!
}
}
}
struct Person {
@Cached(condition: { $0.age > 18 })
var isAdult: Bool {
age > 18
}
var age: Int
}```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.wrappedValue = wrappedValue
self.condition = condition
}
var wrappedValue: Value {
mutating get {
if value == nil || condition() {
value = wrappedValue()
}
return value!
}
}
}
// Example usage:
struct Person {
@Cached(condition: { $0.age > 18 })
var isAdult: Bool {
age > 18
}
var age: Int
}
var person = Person(age: 20)
print(person.isAdult) // true
person.age = 15
print(person.isAdult) // true
person.age = 25
print(person.isAdult) // false
```struct Cached<Value>: CachedProperty { // property wrapper type 'Cached' has multiple non-static properties named 'wrappedValue'var wrappedValue: Value { // invalid redeclaration of 'wrappedValue'@Cached(condition: { $0.age > 18 }) // variable with getter/setter cannot have an initial value@Cached(condition: { $0.age > 18 }) // property wrapper cannot be applied to a computed propertyprotocol 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.wrappedValue = wrappedValue
self.condition = condition
}
var wrappedValue: Value {
mutating get {
if value == nil || 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 value: Value?
private let condition: () -> Bool
private let wrappedValue: () -> Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.wrappedValue = wrappedValue
self.condition = condition
}
var wrappedValue: Value {
mutating get {
if value == nil || condition() {
value = wrappedValue()
}
return value!
}
}
}
```struct Cached<Value>: CachedProperty { // property wrapper type 'Cached' has multiple non-static properties named 'wrappedValue'var wrappedValue: Value { // invalid redeclaration of 'wrappedValue'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.wrappedValue = wrappedValue
self.condition = condition
}
var wrappedValue: Value {
mutating get {
if value == nil || condition() {
value = wrappedValue()
}
return value!
}
}
}
struct Person {
@Cached(condition: { $0.age > 18 })
var isAdult: Bool
var age: Int
}```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.wrappedValue = wrappedValue
self.condition = condition
}
var wrappedValue: Value {
mutating get {
if value == nil || condition() {
value = wrappedValue()
}
return value!
}
}
}
// Example usage:
struct Person {
@Cached(condition: { $0.age > 18 })
var isAdult: Bool
var age: Int
}
var person = Person(isAdult: false, age: 18)
print(person.isAdult) // true
person.age = 20
print(person.isAdult) // true
```struct Cached<Value>: CachedProperty { // property wrapper type 'Cached' has multiple non-static properties named 'wrappedValue'var wrappedValue: Value { // invalid redeclaration of 'wrappedValue'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 = wrappedValue()
self.condition = condition
}
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 var value: Value?
private let condition: () -> Bool
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.value = wrappedValue()
self.condition = condition
}
var wrappedValue: Value {
get {
if condition() {
value = wrappedValue()
}
return value!
}
set {
value = newValue
}
}
}
```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 value: Value?
private let condition: () -> Bool
private let wrappedValue: () -> Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.wrappedValue = wrappedValue
self.condition = condition
}
var wrappedValue: Value {
mutating get {
if value == nil || 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 var value: Value?
private let condition: () -> Bool
private let wrappedValue: () -> Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.wrappedValue = wrappedValue
self.condition = condition
}
var wrappedValue: Value {
mutating get {
if value == nil || condition() {
value = wrappedValue()
}
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'infix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence {
associativity: left
higherThan: MultiplicationPrecedence
}
func >>> <A, B, C>(lhs: @escaping (A) -> B, rhs: @escaping (B) -> C) -> (A) -> C {
return { rhs(lhs($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: MultiplicationPrecedence
}
func >>> <A, B, C>(lhs: @escaping (A) -> B, rhs: @escaping (B) -> C) -> (A) -> C {
return { rhs(lhs($0)) }
}
```infix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence {
associativity: left
higherThan: MultiplicationPrecedence
}
func >>> <T, U, V>(lhs: @escaping (T) -> U, rhs: @escaping (U) -> V) -> (T) -> V {
return { rhs(lhs($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: MultiplicationPrecedence
}
func >>> <T, U, V>(lhs: @escaping (T) -> U, rhs: @escaping (U) -> V) -> (T) -> V {
return { rhs(lhs($0)) }
}
```infix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence {
associativity: left
higherThan: MultiplicationPrecedence
}
func >>> <A, B, C>(lhs: @escaping (A) -> B, rhs: @escaping (B) -> C) -> (A) -> C {
return { rhs(lhs($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: MultiplicationPrecedence
}
func >>> <A, B, C>(lhs: @escaping (A) -> B, rhs: @escaping (B) -> C) -> (A) -> C {
return { rhs(lhs($0)) }
}
```infix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence {
associativity: left
higherThan: MultiplicationPrecedence
}
func >>> <A, B, C>(lhs: @escaping (A) -> B, rhs: @escaping (B) -> C) -> (A) -> C {
return { a in
rhs(lhs(a))
}
}```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: MultiplicationPrecedence
}
func >>> <A, B, C>(lhs: @escaping (A) -> B, rhs: @escaping (B) -> C) -> (A) -> C {
return { a in
rhs(lhs(a))
}
}
```infix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence {
associativity: left
higherThan: MultiplicationPrecedence
}
func >>> <A, B, C>(lhs: @escaping (A) -> B, rhs: @escaping (B) -> C) -> (A) -> C {
return { rhs(lhs($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: MultiplicationPrecedence
}
func >>> <A, B, C>(lhs: @escaping (A) -> B, rhs: @escaping (B) -> C) -> (A) -> C {
return { rhs(lhs($0)) }
}
// Example usage:
let addOne = { $0 + 1 }
let double = { $0 * 2 }
let addOneAndDouble = addOne >>> double
let result = addOneAndDouble(3) // Output: 8
```infix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence {
associativity: left
higherThan: MultiplicationPrecedence
}
func >>> <A, B, C>(lhs: @escaping (A) -> B, rhs: @escaping (B) -> C) -> (A) -> C {
return { rhs(lhs($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: MultiplicationPrecedence
}
func >>> <A, B, C>(lhs: @escaping (A) -> B, rhs: @escaping (B) -> C) -> (A) -> C {
return { rhs(lhs($0)) }
}
```infix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence {
associativity: left
higherThan: MultiplicationPrecedence
}
func >>> <A, B, C>(lhs: @escaping (A) -> B, rhs: @escaping (B) -> C) -> (A) -> C {
return { a in rhs(lhs(a)) }
}```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: MultiplicationPrecedence
}
func >>> <A, B, C>(lhs: @escaping (A) -> B, rhs: @escaping (B) -> C) -> (A) -> C {
return { a in rhs(lhs(a)) }
}
```infix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence {
associativity: left
higherThan: LogicalConjunctionPrecedence
}
func >>> <T, U, V>(lhs: @escaping (T) -> U, rhs: @escaping (U) -> V) -> (T) -> V {
return { rhs(lhs($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: LogicalConjunctionPrecedence
}
func >>> <T, U, V>(lhs: @escaping (T) -> U, rhs: @escaping (U) -> V) -> (T) -> V {
return { rhs(lhs($0)) }
}
```infix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence {
associativity: left
higherThan: MultiplicationPrecedence
}
func >>> <A, B, C>(lhs: @escaping (A) -> B, rhs: @escaping (B) -> C) -> (A) -> C {
return { a in rhs(lhs(a)) }
}```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: MultiplicationPrecedence
}
func >>> <A, B, C>(lhs: @escaping (A) -> B, rhs: @escaping (B) -> C) -> (A) -> C {
return { a in rhs(lhs(a)) }
}
```infix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence {
associativity: left
higherThan: AssignmentPrecedence
}
func >>> <A, B, C>(lhs: @escaping (A) -> B, rhs: @escaping (B) -> C) -> (A) -> C {
return { rhs(lhs($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: AssignmentPrecedence
}
func >>> <A, B, C>(lhs: @escaping (A) -> B, rhs: @escaping (B) -> C) -> (A) -> C {
return { rhs(lhs($0)) }
}
```import CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest? {
// Create a SHA-256 hasher.
let hasher = SHA256()
// Create a buffer to store the data read from the stream.
var buffer = Data(capacity: bufferSize)
// Read data from the stream until the end is reached.
while inputStream.hasBytesAvailable {
// Read data from the stream.
let bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
// Check if any data was read.
if bytesRead > 0 {
// Update the hasher with the data read from the stream.
hasher.update(data: buffer)
} else {
// Exit the loop if no data was read.
break
}
}
// Return the computed SHA-256 hash.
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? {
// Create a SHA-256 hasher.
let hasher = SHA256()
// Create a buffer to store the data read from the stream.
var buffer = Data(capacity: bufferSize)
// Read data from the stream until the end is reached.
while inputStream.hasBytesAvailable {
// Read data from the stream.
let bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
// Check if any data was read.
if bytesRead > 0 {
// Update the hasher with the data read from the stream.
hasher.update(data: buffer)
} else {
// Exit the loop if no data was read.
break
}
}
// Return the computed SHA-256 hash.
return hasher.finalize()
}
```hasher.update(data: buffer) // cannot use mutating member on immutable value: 'hasher' is a 'let' constantimport CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest? {
let hasher = SHA256()
var digest = SHA256.Digest()
var buffer = [UInt8](repeating: 0, count: bufferSize)
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
if bytesRead > 0 {
hasher.update(data: Data(buffer[0..<bytesRead]))
}
}
hasher.finalize(into: &digest)
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 hasher = SHA256()
var digest = SHA256.Digest()
var buffer = [UInt8](repeating: 0, count: bufferSize)
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
if bytesRead > 0 {
hasher.update(data: Data(buffer[0..<bytesRead]))
}
}
hasher.finalize(into: &digest)
return digest
}
```var digest = SHA256.Digest() // 'SHA256.Digest' (aka 'SHA256Digest') cannot be constructed because it has no accessible initializershasher.update(data: Data(buffer[0..<bytesRead])) // cannot use mutating member on immutable value: 'hasher' is a 'let' constanthasher.finalize(into: &digest) // argument passed to call that takes no argumentsimport CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest? {
// Create a SHA-256 hasher.
let hasher = SHA256()
// Create a buffer of the specified size.
var buffer = Data(count: bufferSize)
// Read data from the stream into the buffer.
while inputStream.read(&buffer, maxLength: bufferSize)!= 0 {
// Update the hasher with the data read from the stream.
hasher.update(data: buffer)
}
// Return the computed SHA-256 hash.
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? {
// Create a SHA-256 hasher.
let hasher = SHA256()
// Create a buffer of the specified size.
var buffer = Data(count: bufferSize)
// Read data from the stream into the buffer.
while inputStream.read(&buffer, maxLength: bufferSize)!= 0 {
// Update the hasher with the data read from the stream.
hasher.update(data: buffer)
}
// Return the computed SHA-256 hash.
return hasher.finalize()
}
```while inputStream.read(&buffer, maxLength: bufferSize)!= 0 { // cannot force unwrap value of non-optional type 'Int'while inputStream.read(&buffer, maxLength: bufferSize)!= 0 { // use of '=' in a boolean context, did you mean '=='?while inputStream.read(&buffer, maxLength: bufferSize)!= 0 { // '=' must have consistent whitespace on both sideshasher.update(data: buffer) // cannot use mutating member on immutable value: 'hasher' is a 'let' constantimport CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest? {
let hashFunction = SHA256()
var digest = hashFunction.digestSize
let buffer = UnsafeMutablePointer<UInt8>.allocate(capacity: bufferSize)
defer { buffer.deallocate() }
var hash = SHA256.Digest()
while inputStream.hasBytesAvailable {
let readBytes = inputStream.read(buffer, maxLength: bufferSize)
if readBytes > 0 {
hash.update(data: Data(bytes: buffer, count: readBytes))
}
}
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? {
let hashFunction = SHA256()
var digest = hashFunction.digestSize
let buffer = UnsafeMutablePointer<UInt8>.allocate(capacity: bufferSize)
defer { buffer.deallocate() }
var hash = SHA256.Digest()
while inputStream.hasBytesAvailable {
let readBytes = inputStream.read(buffer, maxLength: bufferSize)
if readBytes > 0 {
hash.update(data: Data(bytes: buffer, count: readBytes))
}
}
return hash
}
```var digest = hashFunction.digestSize // value of type 'SHA256' has no member 'digestSize'var hash = 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 hasher.
var hasher = SHA256()
// Create a buffer of the specified size.
let buffer = UnsafeMutablePointer<UInt8>.allocate(capacity: bufferSize)
// Read data from the stream and update the hasher with the data.
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(buffer, maxLength: bufferSize)
if bytesRead > 0 {
hasher.update(data: Data(bytes: buffer, count: bytesRead))
}
}
// Release the buffer.
buffer.deallocate()
// Return the computed SHA-256 hash.
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? {
// Create a SHA-256 hasher.
var hasher = SHA256()
// Create a buffer of the specified size.
let buffer = UnsafeMutablePointer<UInt8>.allocate(capacity: bufferSize)
// Read data from the stream and update the hasher with the data.
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(buffer, maxLength: bufferSize)
if bytesRead > 0 {
hasher.update(data: Data(bytes: buffer, count: bytesRead))
}
}
// Release the buffer.
buffer.deallocate()
// Return the computed SHA-256 hash.
return hasher.finalize()
}
// Example usage:
let inputStream = InputStream(fileAtPath: "/path/to/file")!
inputStream.open()
let hash = computeSHA256Hash(of: inputStream, bufferSize: 4096)
inputStream.close()
if let hash = hash {
print("SHA-256 hash: \(hash.hexEncodedString())")
} else {
print("Failed to compute SHA-256 hash.")
}
```import CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest? {
// Create a SHA-256 hasher.
var hasher = SHA256()
// Create a buffer for reading data from the stream.
var buffer = Data(count: bufferSize)
// Read data from the stream until the end is reached.
while inputStream.hasBytesAvailable {
// Read data from the stream.
let bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
// Check if any data was read.
if bytesRead > 0 {
// Update the hasher with the data read from the stream.
hasher.update(data: buffer.prefix(bytesRead))
} else {
// No more data to read, break out of the loop.
break
}
}
// Return the computed SHA-256 hash.
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? {
// Create a SHA-256 hasher.
var hasher = SHA256()
// Create a buffer for reading data from the stream.
var buffer = Data(count: bufferSize)
// Read data from the stream until the end is reached.
while inputStream.hasBytesAvailable {
// Read data from the stream.
let bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
// Check if any data was read.
if bytesRead > 0 {
// Update the hasher with the data read from the stream.
hasher.update(data: buffer.prefix(bytesRead))
} else {
// No more data to read, break out of the loop.
break
}
}
// Return the computed SHA-256 hash.
return hasher.finalize()
}
```let bytesRead = inputStream.read(&buffer, maxLength: bufferSize) // forming 'UnsafeMutablePointer<UInt8>' to a variable of type 'Data'; this is likely incorrect because 'Data' may contain an object reference.import CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest? {
// Create a SHA-256 hasher.
var hasher = SHA256()
// Create a buffer for reading data from the stream.
var buffer = [UInt8](repeating: 0, count: bufferSize)
// Read data from the stream until the end is reached.
while inputStream.hasBytesAvailable {
// Read data from the stream into the buffer.
let bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
// If no data was read, break out of the loop.
if bytesRead == 0 {
break
}
// Update the hasher with the data read from the stream.
hasher.update(data: Data(buffer[0..<bytesRead]))
}
// Return the computed SHA-256 hash.
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? {
// Create a SHA-256 hasher.
var hasher = SHA256()
// Create a buffer for reading data from the stream.
var buffer = [UInt8](repeating: 0, count: bufferSize)
// Read data from the stream until the end is reached.
while inputStream.hasBytesAvailable {
// Read data from the stream into the buffer.
let bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
// If no data was read, break out of the loop.
if bytesRead == 0 {
break
}
// Update the hasher with the data read from the stream.
hasher.update(data: Data(buffer[0..<bytesRead]))
}
// Return the computed SHA-256 hash.
return hasher.finalize()
}
```import CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest? {
// Create a SHA-256 hasher.
var hasher = SHA256()
// Create a buffer of the specified size.
var buffer = [UInt8](repeating: 0, count: bufferSize)
// Read data from the stream into the buffer until there is no more data to read.
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
// If the number of bytes read is negative, the stream has encountered an error.
if bytesRead < 0 {
return nil
}
// If the number of bytes read is zero, the stream has reached the end of the data.
if bytesRead == 0 {
break
}
// Update the hasher with the data read from the stream.
hasher.update(data: Data(buffer[0..<bytesRead]))
}
// Return the computed SHA-256 hash.
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? {
// Create a SHA-256 hasher.
var hasher = SHA256()
// Create a buffer of the specified size.
var buffer = [UInt8](repeating: 0, count: bufferSize)
// Read data from the stream into the buffer until there is no more data to read.
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
// If the number of bytes read is negative, the stream has encountered an error.
if bytesRead < 0 {
return nil
}
// If the number of bytes read is zero, the stream has reached the end of the data.
if bytesRead == 0 {
break
}
// Update the hasher with the data read from the stream.
hasher.update(data: Data(buffer[0..<bytesRead]))
}
// Return the computed SHA-256 hash.
return hasher.finalize()
}
```import CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest? {
// Create a SHA-256 hasher.
var hasher = SHA256()
// Create a buffer to read data from the stream.
var buffer = [UInt8](repeating: 0, count: bufferSize)
// Read data from the stream until the end is reached.
while inputStream.hasBytesAvailable {
// Read data from the stream.
let bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
// Check if any data was read.
if bytesRead > 0 {
// Update the hasher with the data read from the stream.
hasher.update(data: Data(buffer[0..<bytesRead]))
} else {
// Break the loop if no data was read.
break
}
}
// Return the computed SHA-256 hash.
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? {
// Create a SHA-256 hasher.
var hasher = SHA256()
// Create a buffer to read data from the stream.
var buffer = [UInt8](repeating: 0, count: bufferSize)
// Read data from the stream until the end is reached.
while inputStream.hasBytesAvailable {
// Read data from the stream.
let bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
// Check if any data was read.
if bytesRead > 0 {
// Update the hasher with the data read from the stream.
hasher.update(data: Data(buffer[0..<bytesRead]))
} else {
// Break the loop if no data was read.
break
}
}
// Return the computed SHA-256 hash.
return hasher.finalize()
}
```import CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest? {
// Create a SHA-256 hasher.
var hasher = SHA256()
// Create a buffer of the specified size.
let buffer = UnsafeMutablePointer<UInt8>.allocate(capacity: bufferSize)
// Read data from the stream into the buffer until the end of the stream is reached.
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(buffer, maxLength: bufferSize)
if bytesRead > 0 {
// Update the hasher with the data read from the stream.
hasher.update(data: Data(bytes: buffer, count: bytesRead))
}
}
// Free the buffer.
buffer.deallocate()
// Return the computed SHA-256 hash.
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? {
// Create a SHA-256 hasher.
var hasher = SHA256()
// Create a buffer of the specified size.
let buffer = UnsafeMutablePointer<UInt8>.allocate(capacity: bufferSize)
// Read data from the stream into the buffer until the end of the stream is reached.
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(buffer, maxLength: bufferSize)
if bytesRead > 0 {
// Update the hasher with the data read from the stream.
hasher.update(data: Data(bytes: buffer, count: bytesRead))
}
}
// Free the buffer.
buffer.deallocate()
// Return the computed SHA-256 hash.
return hasher.finalize()
}
```typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
extension String {
init(tuple16: Tuple16) {
self.init(tuple16.0, 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)
}
}```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) {
self.init(tuple16.0, 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)
}
}
```self.init(tuple16.0, 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) // initializer expects a single parameter of 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) {
self.init(tuple16.0)
self.append(tuple16.1)
self.append(tuple16.2)
self.append(tuple16.3)
self.append(tuple16.4)
self.append(tuple16.5)
self.append(tuple16.6)
self.append(tuple16.7)
self.append(tuple16.8)
self.append(tuple16.9)
self.append(tuple16.10)
self.append(tuple16.11)
self.append(tuple16.12)
self.append(tuple16.13)
self.append(tuple16.14)
self.append(tuple16.15)
}
}```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) {
self.init(tuple16.0)
self.append(tuple16.1)
self.append(tuple16.2)
self.append(tuple16.3)
self.append(tuple16.4)
self.append(tuple16.5)
self.append(tuple16.6)
self.append(tuple16.7)
self.append(tuple16.8)
self.append(tuple16.9)
self.append(tuple16.10)
self.append(tuple16.11)
self.append(tuple16.12)
self.append(tuple16.13)
self.append(tuple16.14)
self.append(tuple16.15)
}
}
```self.append(tuple16.1) // no exact matches in call to instance method 'append'self.append(tuple16.2) // no exact matches in call to instance method 'append'self.append(tuple16.3) // no exact matches in call to instance method 'append'self.append(tuple16.4) // no exact matches in call to instance method 'append'self.append(tuple16.5) // no exact matches in call to instance method 'append'self.append(tuple16.6) // no exact matches in call to instance method 'append'self.append(tuple16.7) // no exact matches in call to instance method 'append'self.append(tuple16.8) // no exact matches in call to instance method 'append'self.append(tuple16.9) // no exact matches in call to instance method 'append'self.append(tuple16.10) // no exact matches in call to instance method 'append'self.append(tuple16.11) // no exact matches in call to instance method 'append'self.append(tuple16.12) // no exact matches in call to instance method 'append'self.append(tuple16.13) // no exact matches in call to instance method 'append'self.append(tuple16.14) // no exact matches in call to instance method 'append'self.append(tuple16.15) // no exact matches in call to instance method 'append'typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
extension String {
init(tuple16: Tuple16) {
let array = Array(tuple16)
let string = array.withUnsafeBufferPointer {
String(bytes: $0, encoding:.utf8)
}
self.init(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) {
let array = Array(tuple16)
let string = array.withUnsafeBufferPointer {
String(bytes: $0, encoding:.utf8)
}
self.init(string?? "")
}
}
```let array = Array(tuple16) // no exact matches in call to initializerself.init(string?? "") // missing argument labels 'bytes:encoding:' in callself.init(string?? "") // value of optional type 'Optional<_>' must be unwrapped to a value of type '_'self.init(string?? "") // expected ',' separatorself.init(string?? "") // cannot convert value of type 'String' to expected argument type 'String.Encoding'typealias 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 {
let char = tuple16.0
if char == 0 {
break
}
string.append(Character(UnicodeScalar(UInt8(char))))
}
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 string = ""
for i in 0..<16 {
let char = tuple16.0
if char == 0 {
break
}
string.append(Character(UnicodeScalar(UInt8(char))))
}
self = string
}
}
// Example usage:
let tuple16: Tuple16 = (65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 0)
let string = String(tuple16: tuple16)
print(string)
// Output: "ABCDEFGHIJKLMNO"
```for i in 0..<16 { // immutable value 'i' was never used; consider replacing with '_' or removing it // XCTAssertEqual failed: (HHHHHHHHHHHHHHHH) is not equal to (Hello, World!)typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
extension String {
init(tuple16: Tuple16) {
self.init(tuple16.0)
self.append(tuple16.1)
self.append(tuple16.2)
self.append(tuple16.3)
self.append(tuple16.4)
self.append(tuple16.5)
self.append(tuple16.6)
self.append(tuple16.7)
self.append(tuple16.8)
self.append(tuple16.9)
self.append(tuple16.10)
self.append(tuple16.11)
self.append(tuple16.12)
self.append(tuple16.13)
self.append(tuple16.14)
self.append(tuple16.15)
}
}```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) {
self.init(tuple16.0)
self.append(tuple16.1)
self.append(tuple16.2)
self.append(tuple16.3)
self.append(tuple16.4)
self.append(tuple16.5)
self.append(tuple16.6)
self.append(tuple16.7)
self.append(tuple16.8)
self.append(tuple16.9)
self.append(tuple16.10)
self.append(tuple16.11)
self.append(tuple16.12)
self.append(tuple16.13)
self.append(tuple16.14)
self.append(tuple16.15)
}
}
```self.append(tuple16.1) // no exact matches in call to instance method 'append'self.append(tuple16.2) // no exact matches in call to instance method 'append'self.append(tuple16.3) // no exact matches in call to instance method 'append'self.append(tuple16.4) // no exact matches in call to instance method 'append'self.append(tuple16.5) // no exact matches in call to instance method 'append'self.append(tuple16.6) // no exact matches in call to instance method 'append'self.append(tuple16.7) // no exact matches in call to instance method 'append'self.append(tuple16.8) // no exact matches in call to instance method 'append'self.append(tuple16.9) // no exact matches in call to instance method 'append'self.append(tuple16.10) // no exact matches in call to instance method 'append'self.append(tuple16.11) // no exact matches in call to instance method 'append'self.append(tuple16.12) // no exact matches in call to instance method 'append'self.append(tuple16.13) // no exact matches in call to instance method 'append'self.append(tuple16.14) // no exact matches in call to instance method 'append'self.append(tuple16.15) // no exact matches in call to instance method 'append'typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
extension String {
init(tuple16: Tuple16) {
self.init(cString: tuple16)
}
}```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) {
self.init(cString: tuple16)
}
}
// Example usage:
let tuple16: Tuple16 = (65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 0)
let string = String(tuple16: tuple16)
print(string) // "ABCDEFGHIJKLMNO"
```self.init(cString: tuple16) // no exact matches in call to initializertypealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
extension String {
init(tuple16: Tuple16) {
self.init(tuple16.0)
self.append(tuple16.1)
self.append(tuple16.2)
self.append(tuple16.3)
self.append(tuple16.4)
self.append(tuple16.5)
self.append(tuple16.6)
self.append(tuple16.7)
self.append(tuple16.8)
self.append(tuple16.9)
self.append(tuple16.10)
self.append(tuple16.11)
self.append(tuple16.12)
self.append(tuple16.13)
self.append(tuple16.14)
self.append(tuple16.15)
}
}```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) {
self.init(tuple16.0)
self.append(tuple16.1)
self.append(tuple16.2)
self.append(tuple16.3)
self.append(tuple16.4)
self.append(tuple16.5)
self.append(tuple16.6)
self.append(tuple16.7)
self.append(tuple16.8)
self.append(tuple16.9)
self.append(tuple16.10)
self.append(tuple16.11)
self.append(tuple16.12)
self.append(tuple16.13)
self.append(tuple16.14)
self.append(tuple16.15)
}
}
// Extension to the String type that allows initializing a String from a tuple of 16 UInt8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
self.init(tuple16.0)
self.append(tuple16.1)
self.append(tuple16.2)
self.append(tuple16.3)
self.append(tuple16.4)
self.append(tuple16.5)
self.append(tuple16.6)
self.append(tuple16.7)
self.append(tuple16.8)
self.append(tuple16.9)
self.append(tuple16.10)
self.append(tuple16.11)
self.append(tuple16.12)
self.append(tuple16.13)
self.append(tuple16.14)
self.append(tuple16.15)
}
}
```self.append(tuple16.1) // no exact matches in call to instance method 'append'self.append(tuple16.2) // no exact matches in call to instance method 'append'self.append(tuple16.3) // no exact matches in call to instance method 'append'self.append(tuple16.4) // no exact matches in call to instance method 'append'self.append(tuple16.5) // no exact matches in call to instance method 'append'self.append(tuple16.6) // no exact matches in call to instance method 'append'self.append(tuple16.7) // no exact matches in call to instance method 'append'self.append(tuple16.8) // no exact matches in call to instance method 'append'self.append(tuple16.9) // no exact matches in call to instance method 'append'self.append(tuple16.10) // no exact matches in call to instance method 'append'self.append(tuple16.11) // no exact matches in call to instance method 'append'self.append(tuple16.12) // no exact matches in call to instance method 'append'self.append(tuple16.13) // no exact matches in call to instance method 'append'self.append(tuple16.14) // no exact matches in call to instance method 'append'self.append(tuple16.15) // no exact matches in call to instance method 'append'typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
extension String {
init(tuple16: Tuple16) {
self.init(cString: tuple16)
}
}```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) {
self.init(cString: tuple16)
}
}
```self.init(cString: tuple16) // no exact matches in call to initializertypealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
extension String {
init(tuple16: Tuple16) {
self.init(tuple16.0)
self.append(tuple16.1)
self.append(tuple16.2)
self.append(tuple16.3)
self.append(tuple16.4)
self.append(tuple16.5)
self.append(tuple16.6)
self.append(tuple16.7)
self.append(tuple16.8)
self.append(tuple16.9)
self.append(tuple16.10)
self.append(tuple16.11)
self.append(tuple16.12)
self.append(tuple16.13)
self.append(tuple16.14)
self.append(tuple16.15)
}
}```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) {
self.init(tuple16.0)
self.append(tuple16.1)
self.append(tuple16.2)
self.append(tuple16.3)
self.append(tuple16.4)
self.append(tuple16.5)
self.append(tuple16.6)
self.append(tuple16.7)
self.append(tuple16.8)
self.append(tuple16.9)
self.append(tuple16.10)
self.append(tuple16.11)
self.append(tuple16.12)
self.append(tuple16.13)
self.append(tuple16.14)
self.append(tuple16.15)
}
}
```self.append(tuple16.1) // no exact matches in call to instance method 'append'self.append(tuple16.2) // no exact matches in call to instance method 'append'self.append(tuple16.3) // no exact matches in call to instance method 'append'self.append(tuple16.4) // no exact matches in call to instance method 'append'self.append(tuple16.5) // no exact matches in call to instance method 'append'self.append(tuple16.6) // no exact matches in call to instance method 'append'self.append(tuple16.7) // no exact matches in call to instance method 'append'self.append(tuple16.8) // no exact matches in call to instance method 'append'self.append(tuple16.9) // no exact matches in call to instance method 'append'self.append(tuple16.10) // no exact matches in call to instance method 'append'self.append(tuple16.11) // no exact matches in call to instance method 'append'self.append(tuple16.12) // no exact matches in call to instance method 'append'self.append(tuple16.13) // no exact matches in call to instance method 'append'self.append(tuple16.14) // no exact matches in call to instance method 'append'self.append(tuple16.15) // no exact matches in call to instance method 'append'typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
extension String {
init(tuple16: Tuple16) {
self.init(tuple16.0)
self.append(tuple16.1)
self.append(tuple16.2)
self.append(tuple16.3)
self.append(tuple16.4)
self.append(tuple16.5)
self.append(tuple16.6)
self.append(tuple16.7)
self.append(tuple16.8)
self.append(tuple16.9)
self.append(tuple16.10)
self.append(tuple16.11)
self.append(tuple16.12)
self.append(tuple16.13)
self.append(tuple16.14)
self.append(tuple16.15)
}
}```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) {
self.init(tuple16.0)
self.append(tuple16.1)
self.append(tuple16.2)
self.append(tuple16.3)
self.append(tuple16.4)
self.append(tuple16.5)
self.append(tuple16.6)
self.append(tuple16.7)
self.append(tuple16.8)
self.append(tuple16.9)
self.append(tuple16.10)
self.append(tuple16.11)
self.append(tuple16.12)
self.append(tuple16.13)
self.append(tuple16.14)
self.append(tuple16.15)
}
}
```self.append(tuple16.1) // no exact matches in call to instance method 'append'self.append(tuple16.2) // no exact matches in call to instance method 'append'self.append(tuple16.3) // no exact matches in call to instance method 'append'self.append(tuple16.4) // no exact matches in call to instance method 'append'self.append(tuple16.5) // no exact matches in call to instance method 'append'self.append(tuple16.6) // no exact matches in call to instance method 'append'self.append(tuple16.7) // no exact matches in call to instance method 'append'self.append(tuple16.8) // no exact matches in call to instance method 'append'self.append(tuple16.9) // no exact matches in call to instance method 'append'self.append(tuple16.10) // no exact matches in call to instance method 'append'self.append(tuple16.11) // no exact matches in call to instance method 'append'self.append(tuple16.12) // no exact matches in call to instance method 'append'self.append(tuple16.13) // no exact matches in call to instance method 'append'self.append(tuple16.14) // no exact matches in call to instance method 'append'self.append(tuple16.15) // no exact matches in call to instance method 'append'import CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
let lhsWidth = CVPixelBufferGetWidth(lhs)
let rhsWidth = CVPixelBufferGetWidth(rhs)
let lhsHeight = CVPixelBufferGetHeight(lhs)
let rhsHeight = CVPixelBufferGetHeight(rhs)
let lhsPixelFormat = CVPixelBufferGetPixelFormatType(lhs)
let rhsPixelFormat = CVPixelBufferGetPixelFormatType(rhs)
let lhsBaseAddress = CVPixelBufferGetBaseAddress(lhs)
let rhsBaseAddress = CVPixelBufferGetBaseAddress(rhs)
let lhsBytesPerRow = CVPixelBufferGetBytesPerRow(lhs)
let rhsBytesPerRow = CVPixelBufferGetBytesPerRow(rhs)
let lhsData = lhsBaseAddress?.assumingMemoryBound(to: UInt8.self)
let rhsData = rhsBaseAddress?.assumingMemoryBound(to: UInt8.self)
let lhsDataLength = CVPixelBufferGetDataSize(lhs)
let rhsDataLength = CVPixelBufferGetDataSize(rhs)
if lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsDataLength!= rhsDataLength {
return false
}
if lhsBytesPerRow == rhsBytesPerRow {
return memcmp(lhsData, rhsData, lhsDataLength) == 0
} else {
for i in 0..<lhsHeight {
let lhsRow = lhsData! + (lhsBytesPerRow * i)
let rhsRow = rhsData! + (rhsBytesPerRow * i)
if memcmp(lhsRow, rhsRow, lhsBytesPerRow)!= 0 {
return false
}
}
return true
}
}```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 {
let lhsWidth = CVPixelBufferGetWidth(lhs)
let rhsWidth = CVPixelBufferGetWidth(rhs)
let lhsHeight = CVPixelBufferGetHeight(lhs)
let rhsHeight = CVPixelBufferGetHeight(rhs)
let lhsPixelFormat = CVPixelBufferGetPixelFormatType(lhs)
let rhsPixelFormat = CVPixelBufferGetPixelFormatType(rhs)
let lhsBaseAddress = CVPixelBufferGetBaseAddress(lhs)
let rhsBaseAddress = CVPixelBufferGetBaseAddress(rhs)
let lhsBytesPerRow = CVPixelBufferGetBytesPerRow(lhs)
let rhsBytesPerRow = CVPixelBufferGetBytesPerRow(rhs)
let lhsData = lhsBaseAddress?.assumingMemoryBound(to: UInt8.self)
let rhsData = rhsBaseAddress?.assumingMemoryBound(to: UInt8.self)
let lhsDataLength = CVPixelBufferGetDataSize(lhs)
let rhsDataLength = CVPixelBufferGetDataSize(rhs)
if lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsDataLength!= rhsDataLength {
return false
}
if lhsBytesPerRow == rhsBytesPerRow {
return memcmp(lhsData, rhsData, lhsDataLength) == 0
} else {
for i in 0..<lhsHeight {
let lhsRow = lhsData! + (lhsBytesPerRow * i)
let rhsRow = rhsData! + (rhsBytesPerRow * i)
if memcmp(lhsRow, rhsRow, lhsBytesPerRow)!= 0 {
return false
}
}
return true
}
}
```if lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsDataLength!= rhsDataLength { // use of '=' in a boolean context, did you mean '=='?if lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsDataLength!= rhsDataLength { // type 'OSType' (aka 'UInt32') cannot be used as a boolean; test for '!= 0' insteadif lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsDataLength!= rhsDataLength { // '=' must have consistent whitespace on both sidesif lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsDataLength!= rhsDataLength { // '=' must have consistent whitespace on both sidesif lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsDataLength!= rhsDataLength { // cannot assign value of type '()' to type 'Int'if lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsDataLength!= rhsDataLength { // type 'Int' cannot be used as a boolean; test for '!= 0' insteadif lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsDataLength!= rhsDataLength { // cannot force unwrap value of non-optional type 'OSType' (aka 'UInt32')if lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsDataLength!= rhsDataLength { // type 'Int' cannot be used as a boolean; test for '!= 0' insteadif lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsDataLength!= rhsDataLength { // '=' must have consistent whitespace on both sidesif lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsDataLength!= rhsDataLength { // '=' must have consistent whitespace on both sidesif lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsDataLength!= rhsDataLength { // type 'Int' cannot be used as a boolean; test for '!= 0' insteadif lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsDataLength!= rhsDataLength { // cannot force unwrap value of non-optional type 'Int'if lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsDataLength!= rhsDataLength { // cannot force unwrap value of non-optional type 'Int'if lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsDataLength!= rhsDataLength { // type 'Int' cannot be used as a boolean; test for '!= 0' insteadif lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsDataLength!= rhsDataLength { // cannot force unwrap value of non-optional type 'Int'if lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsDataLength!= rhsDataLength { // type 'OSType' (aka 'UInt32') cannot be used as a boolean; test for '!= 0' insteadif memcmp(lhsRow, rhsRow, lhsBytesPerRow)!= 0 { // '=' must have consistent whitespace on both sidesif memcmp(lhsRow, rhsRow, lhsBytesPerRow)!= 0 { // cannot force unwrap value of non-optional type 'Int32'if memcmp(lhsRow, rhsRow, lhsBytesPerRow)!= 0 { // use of '=' in a boolean context, did you mean '=='?import CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
let lhsWidth = CVPixelBufferGetWidth(lhs)
let lhsHeight = CVPixelBufferGetHeight(lhs)
let rhsWidth = CVPixelBufferGetWidth(rhs)
let rhsHeight = CVPixelBufferGetHeight(rhs)
let lhsPixelFormat = CVPixelBufferGetPixelFormatType(lhs)
let rhsPixelFormat = CVPixelBufferGetPixelFormatType(rhs)
if lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat {
return false
}
let lhsBaseAddress = CVPixelBufferGetBaseAddress(lhs)
let rhsBaseAddress = CVPixelBufferGetBaseAddress(rhs)
return memcmp(lhsBaseAddress, rhsBaseAddress, CVPixelBufferGetDataSize(lhs)) == 0
}```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 {
let lhsWidth = CVPixelBufferGetWidth(lhs)
let lhsHeight = CVPixelBufferGetHeight(lhs)
let rhsWidth = CVPixelBufferGetWidth(rhs)
let rhsHeight = CVPixelBufferGetHeight(rhs)
let lhsPixelFormat = CVPixelBufferGetPixelFormatType(lhs)
let rhsPixelFormat = CVPixelBufferGetPixelFormatType(rhs)
if lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat {
return false
}
let lhsBaseAddress = CVPixelBufferGetBaseAddress(lhs)
let rhsBaseAddress = CVPixelBufferGetBaseAddress(rhs)
return memcmp(lhsBaseAddress, rhsBaseAddress, CVPixelBufferGetDataSize(lhs)) == 0
}
```if lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat { // cannot assign value of type '()' to type 'Int'if lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat { // '=' must have consistent whitespace on both sidesif lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat { // type 'Int' cannot be used as a boolean; test for '!= 0' insteadif lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat { // cannot force unwrap value of non-optional type 'Int'if lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat { // type 'OSType' (aka 'UInt32') cannot be used as a boolean; test for '!= 0' insteadif lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat { // type 'Int' cannot be used as a boolean; test for '!= 0' insteadif lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat { // '=' must have consistent whitespace on both sidesif lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat { // cannot force unwrap value of non-optional type 'OSType' (aka 'UInt32')if lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat { // '=' must have consistent whitespace on both sidesif lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat { // type 'Int' cannot be used as a boolean; test for '!= 0' insteadif lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat { // cannot force unwrap value of non-optional type 'Int'if lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat { // use of '=' in a boolean context, did you mean '=='?import CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
let lhsWidth = CVPixelBufferGetWidth(lhs)
let rhsWidth = CVPixelBufferGetWidth(rhs)
let lhsHeight = CVPixelBufferGetHeight(lhs)
let rhsHeight = CVPixelBufferGetHeight(rhs)
let lhsPixelFormat = CVPixelBufferGetPixelFormatType(lhs)
let rhsPixelFormat = CVPixelBufferGetPixelFormatType(rhs)
let lhsBaseAddress = CVPixelBufferGetBaseAddress(lhs)
let rhsBaseAddress = CVPixelBufferGetBaseAddress(rhs)
let lhsBytesPerRow = CVPixelBufferGetBytesPerRow(lhs)
let rhsBytesPerRow = CVPixelBufferGetBytesPerRow(rhs)
let lhsData = NSData(bytes: lhsBaseAddress, length: lhsBytesPerRow * lhsHeight)
let rhsData = NSData(bytes: rhsBaseAddress, length: rhsBytesPerRow * rhsHeight)
return lhsWidth == rhsWidth && lhsHeight == rhsHeight && lhsPixelFormat == rhsPixelFormat && lhsData == rhsData
}```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 {
let lhsWidth = CVPixelBufferGetWidth(lhs)
let rhsWidth = CVPixelBufferGetWidth(rhs)
let lhsHeight = CVPixelBufferGetHeight(lhs)
let rhsHeight = CVPixelBufferGetHeight(rhs)
let lhsPixelFormat = CVPixelBufferGetPixelFormatType(lhs)
let rhsPixelFormat = CVPixelBufferGetPixelFormatType(rhs)
let lhsBaseAddress = CVPixelBufferGetBaseAddress(lhs)
let rhsBaseAddress = CVPixelBufferGetBaseAddress(rhs)
let lhsBytesPerRow = CVPixelBufferGetBytesPerRow(lhs)
let rhsBytesPerRow = CVPixelBufferGetBytesPerRow(rhs)
let lhsData = NSData(bytes: lhsBaseAddress, length: lhsBytesPerRow * lhsHeight)
let rhsData = NSData(bytes: rhsBaseAddress, length: rhsBytesPerRow * rhsHeight)
return lhsWidth == rhsWidth && lhsHeight == rhsHeight && lhsPixelFormat == rhsPixelFormat && lhsData == rhsData
}
```import CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
let lhsWidth = CVPixelBufferGetWidth(lhs)
let lhsHeight = CVPixelBufferGetHeight(lhs)
let lhsPixelFormat = CVPixelBufferGetPixelFormatType(lhs)
let lhsBaseAddress = CVPixelBufferGetBaseAddress(lhs)
let lhsBytesPerRow = CVPixelBufferGetBytesPerRow(lhs)
let rhsWidth = CVPixelBufferGetWidth(rhs)
let rhsHeight = CVPixelBufferGetHeight(rhs)
let rhsPixelFormat = CVPixelBufferGetPixelFormatType(rhs)
let rhsBaseAddress = CVPixelBufferGetBaseAddress(rhs)
let rhsBytesPerRow = CVPixelBufferGetBytesPerRow(rhs)
if lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsBaseAddress!= rhsBaseAddress || lhsBytesPerRow!= rhsBytesPerRow {
return false
}
let lhsData = UnsafeMutablePointer<UInt8>(lhsBaseAddress)
let rhsData = UnsafeMutablePointer<UInt8>(rhsBaseAddress)
for i in 0..<lhsHeight {
for j in 0..<lhsWidth {
let lhsPixel = lhsData[i * lhsBytesPerRow + j]
let rhsPixel = rhsData[i * rhsBytesPerRow + j]
if lhsPixel!= rhsPixel {
return false
}
}
}
return true
}```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 {
let lhsWidth = CVPixelBufferGetWidth(lhs)
let lhsHeight = CVPixelBufferGetHeight(lhs)
let lhsPixelFormat = CVPixelBufferGetPixelFormatType(lhs)
let lhsBaseAddress = CVPixelBufferGetBaseAddress(lhs)
let lhsBytesPerRow = CVPixelBufferGetBytesPerRow(lhs)
let rhsWidth = CVPixelBufferGetWidth(rhs)
let rhsHeight = CVPixelBufferGetHeight(rhs)
let rhsPixelFormat = CVPixelBufferGetPixelFormatType(rhs)
let rhsBaseAddress = CVPixelBufferGetBaseAddress(rhs)
let rhsBytesPerRow = CVPixelBufferGetBytesPerRow(rhs)
if lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsBaseAddress!= rhsBaseAddress || lhsBytesPerRow!= rhsBytesPerRow {
return false
}
let lhsData = UnsafeMutablePointer<UInt8>(lhsBaseAddress)
let rhsData = UnsafeMutablePointer<UInt8>(rhsBaseAddress)
for i in 0..<lhsHeight {
for j in 0..<lhsWidth {
let lhsPixel = lhsData[i * lhsBytesPerRow + j]
let rhsPixel = rhsData[i * rhsBytesPerRow + j]
if lhsPixel!= rhsPixel {
return false
}
}
}
return true
}
```if lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsBaseAddress!= rhsBaseAddress || lhsBytesPerRow!= rhsBytesPerRow { // type 'Int' cannot be used as a boolean; test for '!= 0' insteadif lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsBaseAddress!= rhsBaseAddress || lhsBytesPerRow!= rhsBytesPerRow { // cannot force unwrap value of non-optional type 'OSType' (aka 'UInt32')if lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsBaseAddress!= rhsBaseAddress || lhsBytesPerRow!= rhsBytesPerRow { // type 'Int' cannot be used as a boolean; test for '!= 0' insteadif lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsBaseAddress!= rhsBaseAddress || lhsBytesPerRow!= rhsBytesPerRow { // cannot force unwrap value of non-optional type 'Int'if lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsBaseAddress!= rhsBaseAddress || lhsBytesPerRow!= rhsBytesPerRow { // cannot assign value of type '()' to type 'Int'if lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsBaseAddress!= rhsBaseAddress || lhsBytesPerRow!= rhsBytesPerRow { // '=' must have consistent whitespace on both sidesif lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsBaseAddress!= rhsBaseAddress || lhsBytesPerRow!= rhsBytesPerRow { // type 'Int' cannot be used as a boolean; test for '!= 0' insteadif lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsBaseAddress!= rhsBaseAddress || lhsBytesPerRow!= rhsBytesPerRow { // cannot force unwrap value of non-optional type 'Int'if lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsBaseAddress!= rhsBaseAddress || lhsBytesPerRow!= rhsBytesPerRow { // use of '=' in a boolean context, did you mean '=='?if lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsBaseAddress!= rhsBaseAddress || lhsBytesPerRow!= rhsBytesPerRow { // type 'Int' cannot be used as a boolean; test for '!= 0' insteadif lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsBaseAddress!= rhsBaseAddress || lhsBytesPerRow!= rhsBytesPerRow { // '=' must have consistent whitespace on both sidesif lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsBaseAddress!= rhsBaseAddress || lhsBytesPerRow!= rhsBytesPerRow { // cannot convert value of type 'UnsafeMutableRawPointer' to expected argument type 'Bool'if lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsBaseAddress!= rhsBaseAddress || lhsBytesPerRow!= rhsBytesPerRow { // type 'OSType' (aka 'UInt32') cannot be used as a boolean; test for '!= 0' insteadif lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsBaseAddress!= rhsBaseAddress || lhsBytesPerRow!= rhsBytesPerRow { // optional type 'UnsafeMutableRawPointer?' cannot be used as a boolean; test for '!= nil' insteadif lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsBaseAddress!= rhsBaseAddress || lhsBytesPerRow!= rhsBytesPerRow { // type 'OSType' (aka 'UInt32') cannot be used as a boolean; test for '!= 0' insteadif lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsBaseAddress!= rhsBaseAddress || lhsBytesPerRow!= rhsBytesPerRow { // '=' must have consistent whitespace on both sidesif lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsBaseAddress!= rhsBaseAddress || lhsBytesPerRow!= rhsBytesPerRow { // '=' must have consistent whitespace on both sidesif lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsBaseAddress!= rhsBaseAddress || lhsBytesPerRow!= rhsBytesPerRow { // cannot force unwrap value of non-optional type 'Int'if lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsBaseAddress!= rhsBaseAddress || lhsBytesPerRow!= rhsBytesPerRow { // '=' must have consistent whitespace on both sideslet lhsData = UnsafeMutablePointer<UInt8>(lhsBaseAddress) // cannot convert value of type 'UnsafeMutableRawPointer?' to expected argument type 'UnsafeMutablePointer<UInt8>?' because initializer 'init(_:)' was not imported from C headerlet rhsData = UnsafeMutablePointer<UInt8>(rhsBaseAddress) // cannot convert value of type 'UnsafeMutableRawPointer?' to expected argument type 'UnsafeMutablePointer<UInt8>?' because initializer 'init(_:)' was not imported from C headerif lhsPixel!= rhsPixel { // '=' must have consistent whitespace on both sidesif lhsPixel!= rhsPixel { // use of '=' in a boolean context, did you mean '=='?import CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
let lhsWidth = CVPixelBufferGetWidth(lhs)
let lhsHeight = CVPixelBufferGetHeight(lhs)
let lhsPixelFormat = CVPixelBufferGetPixelFormatType(lhs)
let lhsBaseAddress = CVPixelBufferGetBaseAddress(lhs)
let lhsBytesPerRow = CVPixelBufferGetBytesPerRow(lhs)
let rhsWidth = CVPixelBufferGetWidth(rhs)
let rhsHeight = CVPixelBufferGetHeight(rhs)
let rhsPixelFormat = CVPixelBufferGetPixelFormatType(rhs)
let rhsBaseAddress = CVPixelBufferGetBaseAddress(rhs)
let rhsBytesPerRow = CVPixelBufferGetBytesPerRow(rhs)
if lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsBytesPerRow!= rhsBytesPerRow {
return false
}
let lhsData = UnsafeMutablePointer<UInt8>(lhsBaseAddress)
let rhsData = UnsafeMutablePointer<UInt8>(rhsBaseAddress)
for i in 0..<lhsHeight {
for j in 0..<lhsWidth {
if lhsData[i * lhsBytesPerRow + j]!= rhsData[i * rhsBytesPerRow + j] {
return false
}
}
}
return true
}```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 {
let lhsWidth = CVPixelBufferGetWidth(lhs)
let lhsHeight = CVPixelBufferGetHeight(lhs)
let lhsPixelFormat = CVPixelBufferGetPixelFormatType(lhs)
let lhsBaseAddress = CVPixelBufferGetBaseAddress(lhs)
let lhsBytesPerRow = CVPixelBufferGetBytesPerRow(lhs)
let rhsWidth = CVPixelBufferGetWidth(rhs)
let rhsHeight = CVPixelBufferGetHeight(rhs)
let rhsPixelFormat = CVPixelBufferGetPixelFormatType(rhs)
let rhsBaseAddress = CVPixelBufferGetBaseAddress(rhs)
let rhsBytesPerRow = CVPixelBufferGetBytesPerRow(rhs)
if lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsBytesPerRow!= rhsBytesPerRow {
return false
}
let lhsData = UnsafeMutablePointer<UInt8>(lhsBaseAddress)
let rhsData = UnsafeMutablePointer<UInt8>(rhsBaseAddress)
for i in 0..<lhsHeight {
for j in 0..<lhsWidth {
if lhsData[i * lhsBytesPerRow + j]!= rhsData[i * rhsBytesPerRow + j] {
return false
}
}
}
return true
}
```if lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsBytesPerRow!= rhsBytesPerRow { // cannot force unwrap value of non-optional type 'Int'if lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsBytesPerRow!= rhsBytesPerRow { // type 'Int' cannot be used as a boolean; test for '!= 0' insteadif lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsBytesPerRow!= rhsBytesPerRow { // type 'Int' cannot be used as a boolean; test for '!= 0' insteadif lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsBytesPerRow!= rhsBytesPerRow { // '=' must have consistent whitespace on both sidesif lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsBytesPerRow!= rhsBytesPerRow { // cannot assign value of type '()' to type 'Int'if lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsBytesPerRow!= rhsBytesPerRow { // cannot force unwrap value of non-optional type 'Int'if lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsBytesPerRow!= rhsBytesPerRow { // type 'Int' cannot be used as a boolean; test for '!= 0' insteadif lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsBytesPerRow!= rhsBytesPerRow { // cannot force unwrap value of non-optional type 'OSType' (aka 'UInt32')if lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsBytesPerRow!= rhsBytesPerRow { // '=' must have consistent whitespace on both sidesif lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsBytesPerRow!= rhsBytesPerRow { // '=' must have consistent whitespace on both sidesif lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsBytesPerRow!= rhsBytesPerRow { // cannot force unwrap value of non-optional type 'Int'if lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsBytesPerRow!= rhsBytesPerRow { // type 'OSType' (aka 'UInt32') cannot be used as a boolean; test for '!= 0' insteadif lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsBytesPerRow!= rhsBytesPerRow { // type 'OSType' (aka 'UInt32') cannot be used as a boolean; test for '!= 0' insteadif lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsBytesPerRow!= rhsBytesPerRow { // '=' must have consistent whitespace on both sidesif lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsBytesPerRow!= rhsBytesPerRow { // type 'Int' cannot be used as a boolean; test for '!= 0' insteadif lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsBytesPerRow!= rhsBytesPerRow { // use of '=' in a boolean context, did you mean '=='?let lhsData = UnsafeMutablePointer<UInt8>(lhsBaseAddress) // cannot convert value of type 'UnsafeMutableRawPointer?' to expected argument type 'UnsafeMutablePointer<UInt8>?' because initializer 'init(_:)' was not imported from C headerlet rhsData = UnsafeMutablePointer<UInt8>(rhsBaseAddress) // cannot convert value of type 'UnsafeMutableRawPointer?' to expected argument type 'UnsafeMutablePointer<UInt8>?' because initializer 'init(_:)' was not imported from C headerif lhsData[i * lhsBytesPerRow + j]!= rhsData[i * rhsBytesPerRow + j] { // use of '=' in a boolean context, did you mean '=='?if lhsData[i * lhsBytesPerRow + j]!= rhsData[i * rhsBytesPerRow + j] { // '=' must have consistent whitespace on both sidesimport CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
let lhsWidth = CVPixelBufferGetWidth(lhs)
let rhsWidth = CVPixelBufferGetWidth(rhs)
let lhsHeight = CVPixelBufferGetHeight(lhs)
let rhsHeight = CVPixelBufferGetHeight(rhs)
let lhsPixelFormat = CVPixelBufferGetPixelFormatType(lhs)
let rhsPixelFormat = CVPixelBufferGetPixelFormatType(rhs)
let lhsBaseAddress = CVPixelBufferGetBaseAddress(lhs)
let rhsBaseAddress = CVPixelBufferGetBaseAddress(rhs)
let lhsBytesPerRow = CVPixelBufferGetBytesPerRow(lhs)
let rhsBytesPerRow = CVPixelBufferGetBytesPerRow(rhs)
let lhsData = lhsBaseAddress.assumingMemoryBound(to: UInt8.self)
let rhsData = rhsBaseAddress.assumingMemoryBound(to: UInt8.self)
let lhsDataCount = lhsHeight * lhsBytesPerRow
let rhsDataCount = rhsHeight * rhsBytesPerRow
return lhsWidth == rhsWidth && lhsHeight == rhsHeight && lhsPixelFormat == rhsPixelFormat && lhsDataCount == rhsDataCount && memcmp(lhsData, rhsData, lhsDataCount) == 0
}```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 {
let lhsWidth = CVPixelBufferGetWidth(lhs)
let rhsWidth = CVPixelBufferGetWidth(rhs)
let lhsHeight = CVPixelBufferGetHeight(lhs)
let rhsHeight = CVPixelBufferGetHeight(rhs)
let lhsPixelFormat = CVPixelBufferGetPixelFormatType(lhs)
let rhsPixelFormat = CVPixelBufferGetPixelFormatType(rhs)
let lhsBaseAddress = CVPixelBufferGetBaseAddress(lhs)
let rhsBaseAddress = CVPixelBufferGetBaseAddress(rhs)
let lhsBytesPerRow = CVPixelBufferGetBytesPerRow(lhs)
let rhsBytesPerRow = CVPixelBufferGetBytesPerRow(rhs)
let lhsData = lhsBaseAddress.assumingMemoryBound(to: UInt8.self)
let rhsData = rhsBaseAddress.assumingMemoryBound(to: UInt8.self)
let lhsDataCount = lhsHeight * lhsBytesPerRow
let rhsDataCount = rhsHeight * rhsBytesPerRow
return lhsWidth == rhsWidth && lhsHeight == rhsHeight && lhsPixelFormat == rhsPixelFormat && lhsDataCount == rhsDataCount && memcmp(lhsData, rhsData, lhsDataCount) == 0
}
```let lhsData = lhsBaseAddress.assumingMemoryBound(to: UInt8.self) // value of optional type 'UnsafeMutableRawPointer?' must be unwrapped to refer to member 'assumingMemoryBound' of wrapped base type 'UnsafeMutableRawPointer'let rhsData = rhsBaseAddress.assumingMemoryBound(to: UInt8.self) // value of optional type 'UnsafeMutableRawPointer?' must be unwrapped to refer to member 'assumingMemoryBound' of wrapped base type 'UnsafeMutableRawPointer'import CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
let lhsWidth = CVPixelBufferGetWidth(lhs)
let lhsHeight = CVPixelBufferGetHeight(lhs)
let rhsWidth = CVPixelBufferGetWidth(rhs)
let rhsHeight = CVPixelBufferGetHeight(rhs)
let lhsPixelFormat = CVPixelBufferGetPixelFormatType(lhs)
let rhsPixelFormat = CVPixelBufferGetPixelFormatType(rhs)
let lhsBaseAddress = CVPixelBufferGetBaseAddress(lhs)
let rhsBaseAddress = CVPixelBufferGetBaseAddress(rhs)
let lhsBytesPerRow = CVPixelBufferGetBytesPerRow(lhs)
let rhsBytesPerRow = CVPixelBufferGetBytesPerRow(rhs)
let lhsData = lhsBaseAddress?.assumingMemoryBound(to: UInt8.self)
let rhsData = rhsBaseAddress?.assumingMemoryBound(to: UInt8.self)
let lhsDataLength = CVPixelBufferGetDataSize(lhs)
let rhsDataLength = CVPixelBufferGetDataSize(rhs)
if lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsDataLength!= rhsDataLength {
return false
}
if lhsData == rhsData {
return true
}
for i in 0..<lhsDataLength {
if lhsData![i]!= rhsData![i] {
return false
}
}
return true
}```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 {
let lhsWidth = CVPixelBufferGetWidth(lhs)
let lhsHeight = CVPixelBufferGetHeight(lhs)
let rhsWidth = CVPixelBufferGetWidth(rhs)
let rhsHeight = CVPixelBufferGetHeight(rhs)
let lhsPixelFormat = CVPixelBufferGetPixelFormatType(lhs)
let rhsPixelFormat = CVPixelBufferGetPixelFormatType(rhs)
let lhsBaseAddress = CVPixelBufferGetBaseAddress(lhs)
let rhsBaseAddress = CVPixelBufferGetBaseAddress(rhs)
let lhsBytesPerRow = CVPixelBufferGetBytesPerRow(lhs)
let rhsBytesPerRow = CVPixelBufferGetBytesPerRow(rhs)
let lhsData = lhsBaseAddress?.assumingMemoryBound(to: UInt8.self)
let rhsData = rhsBaseAddress?.assumingMemoryBound(to: UInt8.self)
let lhsDataLength = CVPixelBufferGetDataSize(lhs)
let rhsDataLength = CVPixelBufferGetDataSize(rhs)
if lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsDataLength!= rhsDataLength {
return false
}
if lhsData == rhsData {
return true
}
for i in 0..<lhsDataLength {
if lhsData![i]!= rhsData![i] {
return false
}
}
return true
}
```if lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsDataLength!= rhsDataLength { // use of '=' in a boolean context, did you mean '=='?if lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsDataLength!= rhsDataLength { // type 'OSType' (aka 'UInt32') cannot be used as a boolean; test for '!= 0' insteadif lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsDataLength!= rhsDataLength { // '=' must have consistent whitespace on both sidesif lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsDataLength!= rhsDataLength { // '=' must have consistent whitespace on both sidesif lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsDataLength!= rhsDataLength { // cannot assign value of type '()' to type 'Int'if lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsDataLength!= rhsDataLength { // type 'Int' cannot be used as a boolean; test for '!= 0' insteadif lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsDataLength!= rhsDataLength { // cannot force unwrap value of non-optional type 'OSType' (aka 'UInt32')if lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsDataLength!= rhsDataLength { // type 'Int' cannot be used as a boolean; test for '!= 0' insteadif lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsDataLength!= rhsDataLength { // '=' must have consistent whitespace on both sidesif lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsDataLength!= rhsDataLength { // '=' must have consistent whitespace on both sidesif lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsDataLength!= rhsDataLength { // type 'Int' cannot be used as a boolean; test for '!= 0' insteadif lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsDataLength!= rhsDataLength { // cannot force unwrap value of non-optional type 'Int'if lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsDataLength!= rhsDataLength { // cannot force unwrap value of non-optional type 'Int'if lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsDataLength!= rhsDataLength { // type 'Int' cannot be used as a boolean; test for '!= 0' insteadif lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsDataLength!= rhsDataLength { // cannot force unwrap value of non-optional type 'Int'if lhsWidth!= rhsWidth || lhsHeight!= rhsHeight || lhsPixelFormat!= rhsPixelFormat || lhsDataLength!= rhsDataLength { // type 'OSType' (aka 'UInt32') cannot be used as a boolean; test for '!= 0' insteadif lhsData![i]!= rhsData![i] { // '=' must have consistent whitespace on both sidesif lhsData![i]!= rhsData![i] { // use of '=' in a boolean context, did you mean '=='?if lhsData![i]!= rhsData![i] { // cannot force unwrap value of non-optional type 'UInt8'import CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
let lhsWidth = CVPixelBufferGetWidth(lhs)
let rhsWidth = CVPixelBufferGetWidth(rhs)
let lhsHeight = CVPixelBufferGetHeight(lhs)
let rhsHeight = CVPixelBufferGetHeight(rhs)
let lhsPixelFormat = CVPixelBufferGetPixelFormatType(lhs)
let rhsPixelFormat = CVPixelBufferGetPixelFormatType(rhs)
let lhsBaseAddress = CVPixelBufferGetBaseAddress(lhs)
let rhsBaseAddress = CVPixelBufferGetBaseAddress(rhs)
let lhsBytesPerRow = CVPixelBufferGetBytesPerRow(lhs)
let rhsBytesPerRow = CVPixelBufferGetBytesPerRow(rhs)
return (lhsWidth == rhsWidth) && (lhsHeight == rhsHeight) && (lhsPixelFormat == rhsPixelFormat) && (lhsBaseAddress == rhsBaseAddress) && (lhsBytesPerRow == rhsBytesPerRow)
}```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 {
let lhsWidth = CVPixelBufferGetWidth(lhs)
let rhsWidth = CVPixelBufferGetWidth(rhs)
let lhsHeight = CVPixelBufferGetHeight(lhs)
let rhsHeight = CVPixelBufferGetHeight(rhs)
let lhsPixelFormat = CVPixelBufferGetPixelFormatType(lhs)
let rhsPixelFormat = CVPixelBufferGetPixelFormatType(rhs)
let lhsBaseAddress = CVPixelBufferGetBaseAddress(lhs)
let rhsBaseAddress = CVPixelBufferGetBaseAddress(rhs)
let lhsBytesPerRow = CVPixelBufferGetBytesPerRow(lhs)
let rhsBytesPerRow = CVPixelBufferGetBytesPerRow(rhs)
return (lhsWidth == rhsWidth) && (lhsHeight == rhsHeight) && (lhsPixelFormat == rhsPixelFormat) && (lhsBaseAddress == rhsBaseAddress) && (lhsBytesPerRow == rhsBytesPerRow)
}
``` // XCTAssertFalse failedimport CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
let lhsWidth = CVPixelBufferGetWidth(lhs)
let lhsHeight = CVPixelBufferGetHeight(lhs)
let lhsPixelFormat = CVPixelBufferGetPixelFormatType(lhs)
let lhsBaseAddress = CVPixelBufferGetBaseAddress(lhs)
let rhsWidth = CVPixelBufferGetWidth(rhs)
let rhsHeight = CVPixelBufferGetHeight(rhs)
let rhsPixelFormat = CVPixelBufferGetPixelFormatType(rhs)
let rhsBaseAddress = CVPixelBufferGetBaseAddress(rhs)
return lhsWidth == rhsWidth && lhsHeight == rhsHeight && lhsPixelFormat == rhsPixelFormat && lhsBaseAddress == rhsBaseAddress
}```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 {
let lhsWidth = CVPixelBufferGetWidth(lhs)
let lhsHeight = CVPixelBufferGetHeight(lhs)
let lhsPixelFormat = CVPixelBufferGetPixelFormatType(lhs)
let lhsBaseAddress = CVPixelBufferGetBaseAddress(lhs)
let rhsWidth = CVPixelBufferGetWidth(rhs)
let rhsHeight = CVPixelBufferGetHeight(rhs)
let rhsPixelFormat = CVPixelBufferGetPixelFormatType(rhs)
let rhsBaseAddress = CVPixelBufferGetBaseAddress(rhs)
return lhsWidth == rhsWidth && lhsHeight == rhsHeight && lhsPixelFormat == rhsPixelFormat && lhsBaseAddress == rhsBaseAddress
}
``` // XCTAssertFalse failedimport CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
let lhsWidth = CVPixelBufferGetWidth(lhs)
let lhsHeight = CVPixelBufferGetHeight(lhs)
let rhsWidth = CVPixelBufferGetWidth(rhs)
let rhsHeight = CVPixelBufferGetHeight(rhs)
let lhsFormat = CVPixelBufferGetPixelFormatType(lhs)
let rhsFormat = CVPixelBufferGetPixelFormatType(rhs)
let lhsBaseAddress = CVPixelBufferGetBaseAddress(lhs)
let rhsBaseAddress = CVPixelBufferGetBaseAddress(rhs)
let lhsBytesPerRow = CVPixelBufferGetBytesPerRow(lhs)
let rhsBytesPerRow = CVPixelBufferGetBytesPerRow(rhs)
let lhsData = NSData(bytes: lhsBaseAddress, length: lhsBytesPerRow * lhsHeight)
let rhsData = NSData(bytes: rhsBaseAddress, length: rhsBytesPerRow * rhsHeight)
return lhsWidth == rhsWidth && lhsHeight == rhsHeight && lhsFormat == rhsFormat && lhsData == rhsData
}```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 {
let lhsWidth = CVPixelBufferGetWidth(lhs)
let lhsHeight = CVPixelBufferGetHeight(lhs)
let rhsWidth = CVPixelBufferGetWidth(rhs)
let rhsHeight = CVPixelBufferGetHeight(rhs)
let lhsFormat = CVPixelBufferGetPixelFormatType(lhs)
let rhsFormat = CVPixelBufferGetPixelFormatType(rhs)
let lhsBaseAddress = CVPixelBufferGetBaseAddress(lhs)
let rhsBaseAddress = CVPixelBufferGetBaseAddress(rhs)
let lhsBytesPerRow = CVPixelBufferGetBytesPerRow(lhs)
let rhsBytesPerRow = CVPixelBufferGetBytesPerRow(rhs)
let lhsData = NSData(bytes: lhsBaseAddress, length: lhsBytesPerRow * lhsHeight)
let rhsData = NSData(bytes: rhsBaseAddress, length: rhsBytesPerRow * rhsHeight)
return lhsWidth == rhsWidth && lhsHeight == rhsHeight && lhsFormat == rhsFormat && lhsData == rhsData
}
```struct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] {
return items.withUnsafeBufferPointer {
return [PublicItem](UnsafeBufferPointer(start: $0.baseAddress, 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 {
return [PublicItem](UnsafeBufferPointer(start: $0.baseAddress, count: $0.count))
}
}
```return [PublicItem](UnsafeBufferPointer(start: $0.baseAddress, count: $0.count)) // initializer 'init(_:)' requires the types 'PublicItem' and 'PrivateItem' be equivalentstruct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] {
return items.withUnsafeBufferPointer {
return [PublicItem](UnsafeBufferPointer(start: $0.baseAddress, 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 {
return [PublicItem](UnsafeBufferPointer(start: $0.baseAddress, count: $0.count))
}
}
```return [PublicItem](UnsafeBufferPointer(start: $0.baseAddress, count: $0.count)) // initializer 'init(_:)' requires the types 'PublicItem' and 'PrivateItem' be equivalentstruct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] {
return items.withUnsafeBufferPointer {
return [PublicItem](UnsafeBufferPointer(start: $0.baseAddress, 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 {
return [PublicItem](UnsafeBufferPointer(start: $0.baseAddress, count: $0.count))
}
}
```return [PublicItem](UnsafeBufferPointer(start: $0.baseAddress, count: $0.count)) // initializer 'init(_:)' requires the types 'PublicItem' and 'PrivateItem' be equivalentstruct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] {
return items.withUnsafeBufferPointer {
return [PublicItem](UnsafeBufferPointer(start: $0.baseAddress, 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 {
return [PublicItem](UnsafeBufferPointer(start: $0.baseAddress, count: $0.count))
}
}
```return [PublicItem](UnsafeBufferPointer(start: $0.baseAddress, count: $0.count)) // initializer 'init(_:)' requires the types 'PublicItem' and 'PrivateItem' be equivalentstruct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] {
return items.withUnsafeBufferPointer {
return [PublicItem](UnsafeBufferPointer(start: $0.baseAddress, 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 {
return [PublicItem](UnsafeBufferPointer(start: $0.baseAddress, count: $0.count))
}
}
```return [PublicItem](UnsafeBufferPointer(start: $0.baseAddress, count: $0.count)) // initializer 'init(_:)' requires the types 'PublicItem' and 'PrivateItem' be equivalentstruct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] {
return items.withUnsafeBufferPointer {
return [PublicItem](UnsafeBufferPointer(start: $0.baseAddress, 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 {
return [PublicItem](UnsafeBufferPointer(start: $0.baseAddress, count: $0.count))
}
}
```return [PublicItem](UnsafeBufferPointer(start: $0.baseAddress, count: $0.count)) // initializer 'init(_:)' requires the types 'PublicItem' and 'PrivateItem' be equivalentstruct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] {
return items.withUnsafeBufferPointer {
return [PublicItem](UnsafeBufferPointer(start: $0.baseAddress, 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 {
return [PublicItem](UnsafeBufferPointer(start: $0.baseAddress, count: $0.count))
}
}
```return [PublicItem](UnsafeBufferPointer(start: $0.baseAddress, count: $0.count)) // initializer 'init(_:)' requires the types 'PublicItem' and 'PrivateItem' be equivalentstruct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] {
return items.withUnsafeBufferPointer {
return [PublicItem](UnsafeBufferPointer(start: $0.baseAddress, 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 {
return [PublicItem](UnsafeBufferPointer(start: $0.baseAddress, count: $0.count))
}
}
```return [PublicItem](UnsafeBufferPointer(start: $0.baseAddress, count: $0.count)) // initializer 'init(_:)' requires the types 'PublicItem' and 'PrivateItem' be equivalentstruct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] {
return items.withUnsafeBufferPointer {
return [PublicItem](UnsafeBufferPointer(start: $0.baseAddress, 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 {
return [PublicItem](UnsafeBufferPointer(start: $0.baseAddress, count: $0.count))
}
}
```return [PublicItem](UnsafeBufferPointer(start: $0.baseAddress, count: $0.count)) // initializer 'init(_:)' requires the types 'PublicItem' and 'PrivateItem' be equivalentstruct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] {
return items.withUnsafeBufferPointer { (privateItems: UnsafeBufferPointer<PrivateItem>) -> [PublicItem] in
let publicItems = privateItems.baseAddress!.withMemoryRebound(to: PublicItem.self, capacity: privateItems.count) {
Array(UnsafeBufferPointer(start: $0, count: privateItems.count))
}
return publicItems
}
}```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 { (privateItems: UnsafeBufferPointer<PrivateItem>) -> [PublicItem] in
let publicItems = privateItems.baseAddress!.withMemoryRebound(to: PublicItem.self, capacity: privateItems.count) {
Array(UnsafeBufferPointer(start: $0, count: privateItems.count))
}
return publicItems
}
}
```enum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
//...
}```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 {
//...
}
```} // missing return in global function expected to return 'ComparisonResult'enum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
//...
}```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 {
//...
}
```} // missing return in global function expected to return 'ComparisonResult'enum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
//...
}```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 {
//...
}
```} // missing return in global function expected to return 'ComparisonResult'enum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
//...
}```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 {
//...
}
```} // missing return in global function expected to return 'ComparisonResult'enum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
//...
}```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 {
//...
}
```} // missing return in global function expected to return 'ComparisonResult'enum 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 lhsComponentsCount = lhsComponents.count
let rhsComponentsCount = rhsComponents.count
let maxComponentsCount = max(lhsComponentsCount, rhsComponentsCount)
for i in 0..<maxComponentsCount {
let lhsComponent = i < lhsComponentsCount? lhsComponents[i] : ""
let rhsComponent = i < rhsComponentsCount? rhsComponents[i] : ""
let lhsComponentComponents = lhsComponent.components(separatedBy: "-")
let rhsComponentComponents = rhsComponent.components(separatedBy: "-")
let lhsComponentComponentsCount = lhsComponentComponents.count
let rhsComponentComponentsCount = rhsComponentComponents.count
let maxComponentComponentsCount = max(lhsComponentComponentsCount, rhsComponentComponentsCount)
for j in 0..<maxComponentComponentsCount {
let lhsComponentComponent = j < lhsComponentComponentsCount? lhsComponentComponents[j] : ""
let rhsComponentComponent = j < rhsComponentComponentsCount? rhsComponentComponents[j] : ""
if lhsComponentComponent == rhsComponentComponent {
continue
}
if lhsComponentComponent.isEmpty {
return.orderedAscending
}
if rhsComponentComponent.isEmpty {
return.orderedDescending
}
if lhsComponentComponent.range(of: "^[0-9]+$")!= nil && rhsComponentComponent.range(of: "^[0-9]+$")!= nil {
if let lhsComponentComponentInt = Int(lhsComponentComponent), let rhsComponentComponentInt = Int(rhsComponentComponent) {
if lhsComponentComponentInt < rhsComponentComponentInt {
return.orderedAscending
}
if lhsComponentComponentInt > rhsComponentComponentInt {
return.orderedDescending
}
}
}
return lhsComponentComponent.localizedStandardCompare(rhsComponentComponent)
}
}
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 lhsComponentsCount = lhsComponents.count
let rhsComponentsCount = rhsComponents.count
let maxComponentsCount = max(lhsComponentsCount, rhsComponentsCount)
for i in 0..<maxComponentsCount {
let lhsComponent = i < lhsComponentsCount? lhsComponents[i] : ""
let rhsComponent = i < rhsComponentsCount? rhsComponents[i] : ""
let lhsComponentComponents = lhsComponent.components(separatedBy: "-")
let rhsComponentComponents = rhsComponent.components(separatedBy: "-")
let lhsComponentComponentsCount = lhsComponentComponents.count
let rhsComponentComponentsCount = rhsComponentComponents.count
let maxComponentComponentsCount = max(lhsComponentComponentsCount, rhsComponentComponentsCount)
for j in 0..<maxComponentComponentsCount {
let lhsComponentComponent = j < lhsComponentComponentsCount? lhsComponentComponents[j] : ""
let rhsComponentComponent = j < rhsComponentComponentsCount? rhsComponentComponents[j] : ""
if lhsComponentComponent == rhsComponentComponent {
continue
}
if lhsComponentComponent.isEmpty {
return.orderedAscending
}
if rhsComponentComponent.isEmpty {
return.orderedDescending
}
if lhsComponentComponent.range(of: "^[0-9]+$")!= nil && rhsComponentComponent.range(of: "^[0-9]+$")!= nil {
if let lhsComponentComponentInt = Int(lhsComponentComponent), let rhsComponentComponentInt = Int(rhsComponentComponent) {
if lhsComponentComponentInt < rhsComponentComponentInt {
return.orderedAscending
}
if lhsComponentComponentInt > rhsComponentComponentInt {
return.orderedDescending
}
}
}
return lhsComponentComponent.localizedStandardCompare(rhsComponentComponent)
}
}
return.orderedSame
}
```let lhsComponent = i < lhsComponentsCount? lhsComponents[i] : "" // value of optional type 'Int?' must be unwrapped to a value of type 'Int'let lhsComponent = i < lhsComponentsCount? lhsComponents[i] : "" // cannot use optional chaining on non-optional value of type 'Int'let lhsComponent = i < lhsComponentsCount? lhsComponents[i] : "" // consecutive statements on a line must be separated by ';'let lhsComponent = i < lhsComponentsCount? lhsComponents[i] : "" // expected expressionlet lhsComponent = i < lhsComponentsCount? lhsComponents[i] : "" // consecutive statements on a line must be separated by ';'let lhsComponent = i < lhsComponentsCount? lhsComponents[i] : "" // expression of type 'String' is unusedlet rhsComponent = i < rhsComponentsCount? rhsComponents[i] : "" // expression of type 'String' is unusedlet rhsComponent = i < rhsComponentsCount? rhsComponents[i] : "" // consecutive statements on a line must be separated by ';'let rhsComponent = i < rhsComponentsCount? rhsComponents[i] : "" // value of optional type 'Int?' must be unwrapped to a value of type 'Int'let rhsComponent = i < rhsComponentsCount? rhsComponents[i] : "" // consecutive statements on a line must be separated by ';'let rhsComponent = i < rhsComponentsCount? rhsComponents[i] : "" // expected expressionlet rhsComponent = i < rhsComponentsCount? rhsComponents[i] : "" // cannot use optional chaining on non-optional value of type 'Int'let lhsComponentComponent = j < lhsComponentComponentsCount? lhsComponentComponents[j] : "" // consecutive statements on a line must be separated by ';'let lhsComponentComponent = j < lhsComponentComponentsCount? lhsComponentComponents[j] : "" // value of optional type 'Optional<_>' must be unwrapped to a value of type '_'let lhsComponentComponent = j < lhsComponentComponentsCount? lhsComponentComponents[j] : "" // consecutive statements on a line must be separated by ';'let lhsComponentComponent = j < lhsComponentComponentsCount? lhsComponentComponents[j] : "" // expected expressionlet rhsComponentComponent = j < rhsComponentComponentsCount? rhsComponentComponents[j] : "" // expected expressionlet rhsComponentComponent = j < rhsComponentComponentsCount? rhsComponentComponents[j] : "" // consecutive statements on a line must be separated by ';'let rhsComponentComponent = j < rhsComponentComponentsCount? rhsComponentComponents[j] : "" // consecutive statements on a line must be separated by ';'let rhsComponentComponent = j < rhsComponentComponentsCount? rhsComponentComponents[j] : "" // value of optional type 'Optional<_>' must be unwrapped to a value of type '_'if lhsComponentComponent.range(of: "^[0-9]+$")!= nil && rhsComponentComponent.range(of: "^[0-9]+$")!= nil { // '=' must have consistent whitespace on both sidesif lhsComponentComponent.range(of: "^[0-9]+$")!= nil && rhsComponentComponent.range(of: "^[0-9]+$")!= nil { // '=' must have consistent whitespace on both sidesenum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
//...
}```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 {
//...
}
```} // missing return in global function expected to return 'ComparisonResult'enum 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 lhsMajor = Int(lhsComponents[0])!
let rhsMajor = Int(rhsComponents[0])!
if lhsMajor < rhsMajor {
return.orderedAscending
} else if lhsMajor > rhsMajor {
return.orderedDescending
}
let lhsMinor = Int(lhsComponents[1])!
let rhsMinor = Int(rhsComponents[1])!
if lhsMinor < rhsMinor {
return.orderedAscending
} else if lhsMinor > rhsMinor {
return.orderedDescending
}
let lhsPatch = Int(lhsComponents[2])!
let rhsPatch = Int(rhsComponents[2])!
if lhsPatch < rhsPatch {
return.orderedAscending
} else if lhsPatch > rhsPatch {
return.orderedDescending
}
let lhsTag = lhsComponents[3]
let rhsTag = rhsComponents[3]
if lhsTag == rhsTag {
return.orderedSame
} else if lhsTag == "alpha" {
return.orderedAscending
} else if rhsTag == "alpha" {
return.orderedDescending
} else if lhsTag == "beta" {
return.orderedAscending
} else if rhsTag == "beta" {
return.orderedDescending
}
return.orderedSame
}
func compareVersions(_ lhs: String, _ rhs: String) -> Bool {
return compareVersions(lhs, rhs) ==.orderedAscending
}
func compareVersions(_ lhs: String, _ rhs: String) -> Bool {
let lhsComponents = lhs.components(separatedBy: ".")
let rhsComponents = rhs.components(separatedBy: ".")
let lhsMajor = Int(lhsComponents[0])!
let rhsMajor = Int(rhsComponents[0])!
if lhsMajor < rhsMajor {
return true
} else if lhsMajor > rhsMajor {
return false
}
let lhsMinor = Int(lhsComponents[1])!
let rhsMinor = Int(rhsComponents[1])!
if lhsMinor < rhsMinor {
return true
} else if lhsMinor > rhsMinor {
return false
}
let lhsPatch = Int(lhsComponents[2])!
let rhsPatch = Int(rhsComponents[2])!
if lhsPatch < rhsPatch {
return true
} else if lhsPatch > rhsPatch {
return false
}
let lhsTag = lhsComponents[3]
let rhsTag = rhsComponents[3]
if lhsTag == rhsTag {
return false
} else if lhsTag == "alpha" {
return true
} else if rhsTag == "alpha" {
return false
} else if lhsTag == "beta" {
return true
} else if rhsTag == "beta" {
return false
}
return false
}```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 lhsMajor = Int(lhsComponents[0])!
let rhsMajor = Int(rhsComponents[0])!
if lhsMajor < rhsMajor {
return.orderedAscending
} else if lhsMajor > rhsMajor {
return.orderedDescending
}
let lhsMinor = Int(lhsComponents[1])!
let rhsMinor = Int(rhsComponents[1])!
if lhsMinor < rhsMinor {
return.orderedAscending
} else if lhsMinor > rhsMinor {
return.orderedDescending
}
let lhsPatch = Int(lhsComponents[2])!
let rhsPatch = Int(rhsComponents[2])!
if lhsPatch < rhsPatch {
return.orderedAscending
} else if lhsPatch > rhsPatch {
return.orderedDescending
}
let lhsTag = lhsComponents[3]
let rhsTag = rhsComponents[3]
if lhsTag == rhsTag {
return.orderedSame
} else if lhsTag == "alpha" {
return.orderedAscending
} else if rhsTag == "alpha" {
return.orderedDescending
} else if lhsTag == "beta" {
return.orderedAscending
} else if rhsTag == "beta" {
return.orderedDescending
}
return.orderedSame
}
// 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 Bool.
func compareVersions(_ lhs: String, _ rhs: String) -> Bool {
return compareVersions(lhs, rhs) ==.orderedAscending
}
// 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 Bool.
func compareVersions(_ lhs: String, _ rhs: String) -> Bool {
let lhsComponents = lhs.components(separatedBy: ".")
let rhsComponents = rhs.components(separatedBy: ".")
let lhsMajor = Int(lhsComponents[0])!
let rhsMajor = Int(rhsComponents[0])!
if lhsMajor < rhsMajor {
return true
} else if lhsMajor > rhsMajor {
return false
}
let lhsMinor = Int(lhsComponents[1])!
let rhsMinor = Int(rhsComponents[1])!
if lhsMinor < rhsMinor {
return true
} else if lhsMinor > rhsMinor {
return false
}
let lhsPatch = Int(lhsComponents[2])!
let rhsPatch = Int(rhsComponents[2])!
if lhsPatch < rhsPatch {
return true
} else if lhsPatch > rhsPatch {
return false
}
let lhsTag = lhsComponents[3]
let rhsTag = rhsComponents[3]
if lhsTag == rhsTag {
return false
} else if lhsTag == "alpha" {
return true
} else if rhsTag == "alpha" {
return false
} else if lhsTag == "beta" {
return true
} else if rhsTag == "beta" {
return false
}
return false
}
```return compareVersions(lhs, rhs) ==.orderedAscending // '==' is not a prefix unary operatorreturn compareVersions(lhs, rhs) ==.orderedAscending // cannot infer contextual base in reference to member 'orderedAscending'return compareVersions(lhs, rhs) ==.orderedAscending // consecutive statements on a line must be separated by ';'func compareVersions(_ lhs: String, _ rhs: String) -> Bool { // invalid redeclaration of 'compareVersions'enum 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 lhsComponentsCount = lhsComponents.count
let rhsComponentsCount = rhsComponents.count
let maxComponentsCount = max(lhsComponentsCount, rhsComponentsCount)
for index in 0..<maxComponentsCount {
let lhsComponent = index < lhsComponentsCount? lhsComponents[index] : "0"
let rhsComponent = index < rhsComponentsCount? rhsComponents[index] : "0"
if lhsComponent!= rhsComponent {
let lhsVersion = Version(rawValue: lhsComponent)
let rhsVersion = Version(rawValue: rhsComponent)
if lhsVersion!= nil && rhsVersion!= nil {
return lhsVersion!.rawValue < rhsVersion!.rawValue?.orderedAscending :.orderedDescending
} else {
return Int(lhsComponent)?? 0 < Int(rhsComponent)?? 0?.orderedAscending :.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 lhsComponentsCount = lhsComponents.count
let rhsComponentsCount = rhsComponents.count
let maxComponentsCount = max(lhsComponentsCount, rhsComponentsCount)
for index in 0..<maxComponentsCount {
let lhsComponent = index < lhsComponentsCount? lhsComponents[index] : "0"
let rhsComponent = index < rhsComponentsCount? rhsComponents[index] : "0"
if lhsComponent!= rhsComponent {
let lhsVersion = Version(rawValue: lhsComponent)
let rhsVersion = Version(rawValue: rhsComponent)
if lhsVersion!= nil && rhsVersion!= nil {
return lhsVersion!.rawValue < rhsVersion!.rawValue?.orderedAscending :.orderedDescending
} else {
return Int(lhsComponent)?? 0 < Int(rhsComponent)?? 0?.orderedAscending :.orderedDescending
}
}
}
return.orderedSame
}
```let lhsComponent = index < lhsComponentsCount? lhsComponents[index] : "0" // expected expressionlet lhsComponent = index < lhsComponentsCount? lhsComponents[index] : "0" // expression of type 'String' is unusedlet lhsComponent = index < lhsComponentsCount? lhsComponents[index] : "0" // consecutive statements on a line must be separated by ';'let lhsComponent = index < lhsComponentsCount? lhsComponents[index] : "0" // cannot use optional chaining on non-optional value of type 'Int'let lhsComponent = index < lhsComponentsCount? lhsComponents[index] : "0" // consecutive statements on a line must be separated by ';'let lhsComponent = index < lhsComponentsCount? lhsComponents[index] : "0" // value of optional type 'Int?' must be unwrapped to a value of type 'Int'let rhsComponent = index < rhsComponentsCount? rhsComponents[index] : "0" // consecutive statements on a line must be separated by ';'let rhsComponent = index < rhsComponentsCount? rhsComponents[index] : "0" // expected expressionlet rhsComponent = index < rhsComponentsCount? rhsComponents[index] : "0" // consecutive statements on a line must be separated by ';'let rhsComponent = index < rhsComponentsCount? rhsComponents[index] : "0" // expression of type 'String' is unusedlet rhsComponent = index < rhsComponentsCount? rhsComponents[index] : "0" // cannot use optional chaining on non-optional value of type 'Int'let rhsComponent = index < rhsComponentsCount? rhsComponents[index] : "0" // value of optional type 'Int?' must be unwrapped to a value of type 'Int'if lhsComponent!= rhsComponent { // '=' must have consistent whitespace on both sidesif lhsComponent!= rhsComponent { // use of '=' in a boolean context, did you mean '=='?let lhsVersion = Version(rawValue: lhsComponent) // cannot find 'Version' in scopelet rhsVersion = Version(rawValue: rhsComponent) // cannot find 'Version' in scopeif lhsVersion!= nil && rhsVersion!= nil { // '=' must have consistent whitespace on both sidesif lhsVersion!= nil && rhsVersion!= nil { // 'nil' is not compatible with expected argument type 'Bool'if lhsVersion!= nil && rhsVersion!= nil { // '=' must have consistent whitespace on both sidesif lhsVersion!= nil && rhsVersion!= nil { // use of '=' in a boolean context, did you mean '=='?if lhsVersion!= nil && rhsVersion!= nil { // 'nil' cannot be assigned to type 'Bool'return lhsVersion!.rawValue < rhsVersion!.rawValue?.orderedAscending :.orderedDescending // value of optional type 'Optional<_>' must be unwrapped to a value of type '_'return lhsVersion!.rawValue < rhsVersion!.rawValue?.orderedAscending :.orderedDescending // expected expressionreturn lhsVersion!.rawValue < rhsVersion!.rawValue?.orderedAscending :.orderedDescending // cannot convert return expression of type 'Bool' to return type 'ComparisonResult'return lhsVersion!.rawValue < rhsVersion!.rawValue?.orderedAscending :.orderedDescending // consecutive statements on a line must be separated by ';'return Int(lhsComponent)?? 0 < Int(rhsComponent)?? 0?.orderedAscending :.orderedDescending // value of optional type 'Int?' must be unwrapped to a value of type 'Int'return Int(lhsComponent)?? 0 < Int(rhsComponent)?? 0?.orderedAscending :.orderedDescending // consecutive statements on a line must be separated by ';'return Int(lhsComponent)?? 0 < Int(rhsComponent)?? 0?.orderedAscending :.orderedDescending // consecutive statements on a line must be separated by ';'return Int(lhsComponent)?? 0 < Int(rhsComponent)?? 0?.orderedAscending :.orderedDescending // cannot use optional chaining on non-optional value of type 'Int'return Int(lhsComponent)?? 0 < Int(rhsComponent)?? 0?.orderedAscending :.orderedDescending // cannot use optional chaining on non-optional value of type 'Int'return Int(lhsComponent)?? 0 < Int(rhsComponent)?? 0?.orderedAscending :.orderedDescending // cannot use optional chaining on non-optional value of type 'Int'return Int(lhsComponent)?? 0 < Int(rhsComponent)?? 0?.orderedAscending :.orderedDescending // cannot convert return expression of type 'Int?' to return type 'ComparisonResult'return Int(lhsComponent)?? 0 < Int(rhsComponent)?? 0?.orderedAscending :.orderedDescending // consecutive statements on a line must be separated by ';'return Int(lhsComponent)?? 0 < Int(rhsComponent)?? 0?.orderedAscending :.orderedDescending // value of type 'Int' has no member 'orderedAscending'return Int(lhsComponent)?? 0 < Int(rhsComponent)?? 0?.orderedAscending :.orderedDescending // expected expressionenum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
// TODO: Implement this function.
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 {
// TODO: Implement this function.
return.orderedSame
}
// Test cases.
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") ==.orderedAscending
compareVersions("1.0.0", "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.beta", "1.0.0-beta") ==.orderedAscending
compareVersions("1.0.0-beta", "1.0.0-alpha.beta") ==.orderedDescending
compareVersions("1.0.0-alpha.1", "1.0.0-alpha.beta") ==.orderedAscending
compareVersions("1.0.0-alpha.beta", "1.0.0-alpha.1") ==.orderedDescending
compareVersions("1.0.0-alpha.1", "1.0.0-alpha.1.1") ==.orderedAscending
compareVersions("1.0.0-alpha.1.1", "1.0.0-alpha.1") ==.orderedDescending
compareVersions("1.0.0+001", "1.0.0+007") ==.orderedAscending
compareVersions("1.0.0+007", "1.0.0+001") ==.orderedDescending
compareVersions("1.0.0-alpha+001", "1.0.0-alpha+007") ==.orderedAscending
compareVersions("1.0.0-alpha+007", "1.0.0-alpha+001") ==.orderedDescending
compareVersions("1.0.0+20130313144700", "1.0.0+20130313144701") ==.orderedAscending
compareVersions("1.0.0+20130313144701", "1.0.0+20130313144700") ==.orderedDescending
compareVersions("1.0.0-beta+exp.sha.5114f85", "1.0.0-beta") ==.orderedAscending
compareVersions("1.0.0-beta", "1.0.0-beta+exp.sha.5114f85") ==.orderedDescending
compareVersions("1.0.0-beta+exp.sha.5114f85", "1.0.0-beta+exp.sha.a7c3ff1") ==.orderedAscending
compareVersions("1.0.0-beta+exp.sha.a7c3ff1", "1.0.0-beta+exp.sha.5114f85") ==.orderedDescending
compareVersions("1.0.0-alpha+001", "1.0.0-alpha+007") ==.orderedAscending
compareVersions("1.0.0-alpha+007", "1.0.0-alpha+001") ==.orderedDescending
compareVersions("1.0.0-alpha+001", "1.0.0-alpha+007") ==.orderedAscending
compareVersions("1.0.0-alpha+007", "1.0.0-alpha+001") ==.orderedDescending
compareVersions("1.0.0-alpha+001", "1.0.0-alpha+007") ==.orderedAscending
compareVersions("1.0.0-alpha+007", "1.0.0-alpha+001") ==.orderedDescending
compareVersions("1.0.0-alpha+001", "1.0.0-alpha+007") ==.orderedAscending
compareVersions("1.0.0-alpha+007", "1.0.0-alpha+001") ==.orderedDescending
compareVersions("1 // XCTAssertTrue failed