Metadata
| Key | Value |
|---|---|
| engine | mlx |
| 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 {
return try JSONSerialization.jsonObject(with: data, options: []) as! JSON
} catch {
throw ParsingError.internalError(error)
}
}```swift
typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
// JSON parser, returns custom error type in case of failures.
func parse(string: String) throws -> JSON {
guard let data = string.data(using:.utf8) else {
throw ParsingError.invalidInput
}
do {
return try JSONSerialization.jsonObject(with: data, options: []) as! JSON
} catch {
throw ParsingError.internalError(error)
}
}
```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
}
guard let json = try? JSONSerialization.jsonObject(with: data, options: []) else {
throw ParsingError.invalidInput
}
guard let jsonDict = json as? JSON else {
throw ParsingError.invalidInput
}
return jsonDict
}```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
}
guard let json = try? JSONSerialization.jsonObject(with: data, options: []) else {
throw ParsingError.invalidInput
}
guard let jsonDict = json as? JSON else {
throw ParsingError.invalidInput
}
return jsonDict
}
// 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
}
guard let json = try? JSONSerialization.jsonObject(with: data, options: []) else {
throw ParsingError.invalidInput
}
guard let jsonDict = json as? JSON else {
throw ParsingError.invalidInput
}
return jsonDict
}
```typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
func parse(string: String) throws -> JSON {
guard let data = string.data(using:.utf8) else {
throw ParsingError.invalidInput
}
do {
return try JSONSerialization.jsonObject(with: data, options: []) as! JSON
} catch {
throw ParsingError.internalError(error)
}
}```swift
typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
// JSON parser, returns custom error type in case of failures.
func parse(string: String) throws -> JSON {
guard let data = string.data(using:.utf8) else {
throw ParsingError.invalidInput
}
do {
return try JSONSerialization.jsonObject(with: data, options: []) as! JSON
} catch {
throw ParsingError.internalError(error)
}
}
```typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
func parse(string: String) throws -> JSON {
guard let data = string.data(using:.utf8) else {
throw ParsingError.invalidInput
}
do {
return try JSONSerialization.jsonObject(with: data, options: []) as! JSON
} catch {
throw ParsingError.internalError(error)
}
}```swift
typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
// JSON parser, returns custom error type in case of failures.
func parse(string: String) throws -> JSON {
guard let data = string.data(using:.utf8) else {
throw ParsingError.invalidInput
}
do {
return try JSONSerialization.jsonObject(with: data, options: []) as! JSON
} catch {
throw ParsingError.internalError(error)
}
}
```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: [])
return json as! JSON
} catch {
throw ParsingError.internalError(error)
}
}
func parse(data: Data) throws -> JSON {
do {
let json = try JSONSerialization.jsonObject(with: data, options: [])
return json as! JSON
} catch {
throw ParsingError.internalError(error)
}
}```swift
typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
// JSON parser, returns custom error type in case of failures.
func parse(string: String) throws -> JSON {
guard let data = string.data(using:.utf8) else {
throw ParsingError.invalidInput
}
do {
let json = try JSONSerialization.jsonObject(with: data, options: [])
return json as! JSON
} catch {
throw ParsingError.internalError(error)
}
}
// JSON parser, returns custom error type in case of failures.
func parse(data: Data) throws -> JSON {
do {
let json = try JSONSerialization.jsonObject(with: data, options: [])
return json as! JSON
} catch {
throw ParsingError.internalError(error)
}
}
```typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
func parse(string: String) throws -> JSON {
guard let data = string.data(using:.utf8) else {
throw ParsingError.invalidInput
}
do {
let json = try JSONSerialization.jsonObject(with: data, options: [])
guard let dictionary = json as? JSON else {
throw ParsingError.invalidInput
}
return dictionary
} 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: [])
guard let dictionary = json as? JSON else {
throw ParsingError.invalidInput
}
return dictionary
} catch {
throw ParsingError.internalError(error)
}
}
```typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
func parse(string: String) throws -> JSON {
guard let data = string.data(using:.utf8) else {
throw ParsingError.invalidInput
}
do {
return try JSONSerialization.jsonObject(with: data, options: []) as! JSON
} catch {
throw ParsingError.internalError(error)
}
}```swift
typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
// JSON parser, returns custom error type in case of failures.
func parse(string: String) throws -> JSON {
guard let data = string.data(using:.utf8) else {
throw ParsingError.invalidInput
}
do {
return try JSONSerialization.jsonObject(with: data, options: []) as! JSON
} catch {
throw ParsingError.internalError(error)
}
}
```typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
func parse(string: String) throws -> JSON {
guard let data = string.data(using:.utf8) else {
throw ParsingError.invalidInput
}
do {
return try JSONSerialization.jsonObject(with: data, options: []) as! JSON
} catch {
throw ParsingError.internalError(error)
}
}```swift
typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
// JSON parser, returns custom error type in case of failures.
func parse(string: String) throws -> JSON {
guard let data = string.data(using:.utf8) else {
throw ParsingError.invalidInput
}
do {
return try JSONSerialization.jsonObject(with: data, options: []) as! JSON
} catch {
throw ParsingError.internalError(error)
}
}
```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: [])
guard let dictionary = json as? JSON else {
throw ParsingError.invalidInput
}
return dictionary
} 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: [])
guard let dictionary = json as? JSON else {
throw ParsingError.invalidInput
}
return dictionary
} catch {
throw ParsingError.internalError(error)
}
}
```typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
func parse(string: String) throws -> JSON {
guard let data = string.data(using:.utf8) else {
throw ParsingError.invalidInput
}
do {
return try JSONSerialization.jsonObject(with: data, options: []) as? JSON
} catch {
throw ParsingError.internalError(error)
}
}```swift
typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
// JSON parser, returns custom error type in case of failures.
func parse(string: String) throws -> JSON {
guard let data = string.data(using:.utf8) else {
throw ParsingError.invalidInput
}
do {
return try JSONSerialization.jsonObject(with: data, options: []) as? JSON
} catch {
throw ParsingError.internalError(error)
}
}
```return try JSONSerialization.jsonObject(with: data, options: []) as? JSON // value of optional type 'JSON?' (aka 'Optional<Dictionary<String, Any>>') must be unwrapped to a value of type 'JSON' (aka 'Dictionary<String, Any>')indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
func generate(_ tree: HTMLNode) -> String {
switch tree {
case.text(let content):
return content
case.element(let name, let attributes, let children):
var result = "<\(name)"
for (key, value) in attributes {
result += " \(key)=\"\(value)\""
}
result += ">"
for child in children {
result += generate(child)
}
result += "</\(name)>"
return result
}
}```swift
indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case.text(let content):
return content
case.element(let name, let attributes, let children):
var result = "<\(name)"
for (key, value) in attributes {
result += " \(key)=\"\(value)\""
}
result += ">"
for child in children {
result += generate(child)
}
result += "</\(name)>"
return result
}
}
let tree = HTMLNode.element("div", children: [
.element("a", attributes: ["href": "swifteval"]),
.text("Hello, world!")
])
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):
var result = "<\(name)"
for (key, value) in attributes {
result += " \(key)=\"\(value)\""
}
result += ">"
for child in children {
result += generate(child)
}
result += "</\(name)>"
return result
}
}```swift
indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case.text(let content):
return content
case.element(let name, let attributes, let children):
var result = "<\(name)"
for (key, value) in attributes {
result += " \(key)=\"\(value)\""
}
result += ">"
for child in children {
result += generate(child)
}
result += "</\(name)>"
return result
}
}
// Example of usage
let tree = HTMLNode.element("div", children: [
.element("a", attributes: ["href": "swifteval"]),
.text("Hello, world!")
])
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):
var result = "<\(name)"
for (key, value) in attributes {
result += " \(key)=\"\(value)\""
}
result += ">"
for child in children {
result += generate(child)
}
result += "</\(name)>"
return result
}
}```swift
indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case.text(let content):
return content
case.element(let name, let attributes, let children):
var result = "<\(name)"
for (key, value) in attributes {
result += " \(key)=\"\(value)\""
}
result += ">"
for child in children {
result += generate(child)
}
result += "</\(name)>"
return result
}
}
let tree = HTMLNode.element("div", children: [
.element("a", attributes: ["href": "swifteval"])
])
print(generate(tree))
```indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
func generate(_ tree: HTMLNode) -> String {
switch tree {
case.text(let content):
return content
case.element(let name, let attributes, let children):
var result = "<\(name)"
for (key, value) in attributes {
result += " \(key)=\"\(value)\""
}
result += ">"
for child in children {
result += generate(child)
}
result += "</\(name)>"
return result
}
}```swift
indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case.text(let content):
return content
case.element(let name, let attributes, let children):
var result = "<\(name)"
for (key, value) in attributes {
result += " \(key)=\"\(value)\""
}
result += ">"
for child in children {
result += generate(child)
}
result += "</\(name)>"
return result
}
}
// 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):
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):
var result = "<\(name)"
for (key, value) in attributes {
result += " \(key)=\"\(value)\""
}
result += ">"
for child in children {
result += generate(child)
}
result += "</\(name)>"
return result
}
}```swift
indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case.text(let content):
return content
case.element(let name, let attributes, let children):
var result = "<\(name)"
for (key, value) in attributes {
result += " \(key)=\"\(value)\""
}
result += ">"
for child in children {
result += generate(child)
}
result += "</\(name)>"
return result
}
}
// Example of usage
let tree = HTMLNode.element("div", children: [
.element("a", attributes: ["href": "swifteval"]),
.text("Hello, world!")
])
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):
var result = "<\(name)"
for (key, value) in attributes {
result += " \(key)=\"\(value)\""
}
result += ">"
for child in children {
result += generate(child)
}
result += "</\(name)>"
return result
}
}```swift
indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case.text(let content):
return content
case.element(let name, let attributes, let children):
var result = "<\(name)"
for (key, value) in attributes {
result += " \(key)=\"\(value)\""
}
result += ">"
for child in children {
result += generate(child)
}
result += "</\(name)>"
return result
}
}
// Example of usage
let tree = HTMLNode.element("div", children: [
.element("a", attributes: ["href": "swifteval"], children: [.text("SwiftEval")]),
])
print(generate(tree))
```enum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
let tokens = string.components(separatedBy: " ")
var stack = [Double]()
for token in tokens {
switch token {
case "+":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let operand2 = stack.popLast()!
let operand1 = stack.popLast()!
stack.append(operand1 + operand2)
case "-":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let operand2 = stack.popLast()!
let operand1 = stack.popLast()!
stack.append(operand1 - operand2)
case "*":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let operand2 = stack.popLast()!
let operand1 = stack.popLast()!
stack.append(operand1 * operand2)
case "/":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let operand2 = stack.popLast()!
let operand1 = stack.popLast()!
stack.append(operand1 / operand2)
default:
guard let operand = Double(token) else { throw CalculateError.invalidInput }
stack.append(operand)
}
}
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.components(separatedBy: " ")
var stack = [Double]()
for token in tokens {
switch token {
case "+":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let operand2 = stack.popLast()!
let operand1 = stack.popLast()!
stack.append(operand1 + operand2)
case "-":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let operand2 = stack.popLast()!
let operand1 = stack.popLast()!
stack.append(operand1 - operand2)
case "*":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let operand2 = stack.popLast()!
let operand1 = stack.popLast()!
stack.append(operand1 * operand2)
case "/":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let operand2 = stack.popLast()!
let operand1 = stack.popLast()!
stack.append(operand1 / operand2)
default:
guard let operand = Double(token) else { throw CalculateError.invalidInput }
stack.append(operand)
}
}
return stack.popLast()!
}
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: " ")
var stack = [Double]()
for token in tokens {
switch token {
case "+":
guard let operand2 = stack.popLast(), let operand1 = stack.popLast() else {
throw CalculateError.invalidInput
}
stack.append(operand1 + operand2)
case "-":
guard let operand2 = stack.popLast(), let operand1 = stack.popLast() else {
throw CalculateError.invalidInput
}
stack.append(operand1 - operand2)
case "*":
guard let operand2 = stack.popLast(), let operand1 = stack.popLast() else {
throw CalculateError.invalidInput
}
stack.append(operand1 * operand2)
case "/":
guard let operand2 = stack.popLast(), let operand1 = stack.popLast() else {
throw CalculateError.invalidInput
}
stack.append(operand1 / operand2)
default:
guard let operand = Double(token) else {
throw CalculateError.invalidInput
}
stack.append(operand)
}
}
guard stack.count == 1 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: " ")
var stack = [Double]()
for token in tokens {
switch token {
case "+":
guard let operand2 = stack.popLast(), let operand1 = stack.popLast() else {
throw CalculateError.invalidInput
}
stack.append(operand1 + operand2)
case "-":
guard let operand2 = stack.popLast(), let operand1 = stack.popLast() else {
throw CalculateError.invalidInput
}
stack.append(operand1 - operand2)
case "*":
guard let operand2 = stack.popLast(), let operand1 = stack.popLast() else {
throw CalculateError.invalidInput
}
stack.append(operand1 * operand2)
case "/":
guard let operand2 = stack.popLast(), let operand1 = stack.popLast() else {
throw CalculateError.invalidInput
}
stack.append(operand1 / operand2)
default:
guard let operand = Double(token) else {
throw CalculateError.invalidInput
}
stack.append(operand)
}
}
guard stack.count == 1 else {
throw CalculateError.invalidInput
}
return stack.popLast()!
}
``` // 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: " ")
var stack = [Double]()
for token in tokens {
switch token {
case "+":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let right = stack.popLast()!
let left = stack.popLast()!
stack.append(left + right)
case "-":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let right = stack.popLast()!
let left = stack.popLast()!
stack.append(left - right)
case "*":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let right = stack.popLast()!
let left = stack.popLast()!
stack.append(left * right)
case "/":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let right = stack.popLast()!
let left = stack.popLast()!
stack.append(left / right)
default:
guard let number = Double(token) else { throw CalculateError.invalidInput }
stack.append(number)
}
}
guard stack.count == 1 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: " ")
var stack = [Double]()
for token in tokens {
switch token {
case "+":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let right = stack.popLast()!
let left = stack.popLast()!
stack.append(left + right)
case "-":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let right = stack.popLast()!
let left = stack.popLast()!
stack.append(left - right)
case "*":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let right = stack.popLast()!
let left = stack.popLast()!
stack.append(left * right)
case "/":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let right = stack.popLast()!
let left = stack.popLast()!
stack.append(left / right)
default:
guard let number = Double(token) else { throw CalculateError.invalidInput }
stack.append(number)
}
}
guard stack.count == 1 else { throw CalculateError.invalidInput }
return stack.popLast()!
}
``` // Fatal error: Error raised at top level: Solution.CalculateError.invalidInputenum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
let tokens = string.components(separatedBy: " ")
var stack = [Double]()
for token in tokens {
switch token {
case "+":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let a = stack.removeLast()
let b = stack.removeLast()
stack.append(b + a)
case "-":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let a = stack.removeLast()
let b = stack.removeLast()
stack.append(b - a)
case "*":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let a = stack.removeLast()
let b = stack.removeLast()
stack.append(b * a)
case "/":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let a = stack.removeLast()
let b = stack.removeLast()
stack.append(b / a)
default:
guard let value = Double(token) else { throw CalculateError.invalidInput }
stack.append(value)
}
}
guard stack.count == 1 else { throw CalculateError.invalidInput }
return stack.removeLast()
}```swift
enum CalculateError: Error {
case invalidInput
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
let tokens = string.components(separatedBy: " ")
var stack = [Double]()
for token in tokens {
switch token {
case "+":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let a = stack.removeLast()
let b = stack.removeLast()
stack.append(b + a)
case "-":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let a = stack.removeLast()
let b = stack.removeLast()
stack.append(b - a)
case "*":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let a = stack.removeLast()
let b = stack.removeLast()
stack.append(b * a)
case "/":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let a = stack.removeLast()
let b = stack.removeLast()
stack.append(b / a)
default:
guard let value = Double(token) else { throw CalculateError.invalidInput }
stack.append(value)
}
}
guard stack.count == 1 else { throw CalculateError.invalidInput }
return stack.removeLast()
}
``` // Fatal error: Error raised at top level: Solution.CalculateError.invalidInputenum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
let tokens = string.components(separatedBy: " ")
var stack = [Double]()
for token in tokens {
switch token {
case "+":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let right = stack.popLast()!
let left = stack.popLast()!
stack.append(left + right)
case "-":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let right = stack.popLast()!
let left = stack.popLast()!
stack.append(left - right)
case "*":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let right = stack.popLast()!
let left = stack.popLast()!
stack.append(left * right)
case "/":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let right = stack.popLast()!
let left = stack.popLast()!
stack.append(left / right)
default:
guard let number = Double(token) else { throw CalculateError.invalidInput }
stack.append(number)
}
}
guard stack.count == 1 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.components(separatedBy: " ")
var stack = [Double]()
for token in tokens {
switch token {
case "+":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let right = stack.popLast()!
let left = stack.popLast()!
stack.append(left + right)
case "-":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let right = stack.popLast()!
let left = stack.popLast()!
stack.append(left - right)
case "*":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let right = stack.popLast()!
let left = stack.popLast()!
stack.append(left * right)
case "/":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let right = stack.popLast()!
let left = stack.popLast()!
stack.append(left / right)
default:
guard let number = Double(token) else { throw CalculateError.invalidInput }
stack.append(number)
}
}
guard stack.count == 1 else { throw CalculateError.invalidInput }
return stack.popLast()!
}
``` // 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: " ")
var stack = [Double]()
for token in tokens {
switch token {
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)
default:
guard let number = Double(token) else {
throw CalculateError.invalidInput
}
stack.append(number)
}
}
guard let result = stack.popLast() else {
throw CalculateError.invalidInput
}
return result
}```swift
enum CalculateError: Error {
case invalidInput
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
let tokens = string.split(separator: " ")
var stack = [Double]()
for token in tokens {
switch token {
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)
default:
guard let number = Double(token) else {
throw CalculateError.invalidInput
}
stack.append(number)
}
}
guard let result = stack.popLast() else {
throw CalculateError.invalidInput
}
return result
}
``` // 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: " ")
var stack = [Double]()
for token in tokens {
switch token {
case "+":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let a = stack.popLast()!
let b = stack.popLast()!
stack.append(b + a)
case "-":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let a = stack.popLast()!
let b = stack.popLast()!
stack.append(b - a)
case "*":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let a = stack.popLast()!
let b = stack.popLast()!
stack.append(b * a)
case "/":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let a = stack.popLast()!
let b = stack.popLast()!
stack.append(b / a)
default:
guard let number = Double(token) else { throw CalculateError.invalidInput }
stack.append(number)
}
}
guard stack.count == 1 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: " ")
var stack = [Double]()
for token in tokens {
switch token {
case "+":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let a = stack.popLast()!
let b = stack.popLast()!
stack.append(b + a)
case "-":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let a = stack.popLast()!
let b = stack.popLast()!
stack.append(b - a)
case "*":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let a = stack.popLast()!
let b = stack.popLast()!
stack.append(b * a)
case "/":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let a = stack.popLast()!
let b = stack.popLast()!
stack.append(b / a)
default:
guard let number = Double(token) else { throw CalculateError.invalidInput }
stack.append(number)
}
}
guard stack.count == 1 else { throw CalculateError.invalidInput }
return stack.popLast()!
}
``` // Fatal error: Error raised at top level: Solution.CalculateError.invalidInputenum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
let tokens = string.components(separatedBy: " ")
var stack = [Double]()
for token in tokens {
switch token {
case "+":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let a = stack.popLast()!
let b = stack.popLast()!
stack.append(b + a)
case "-":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let a = stack.popLast()!
let b = stack.popLast()!
stack.append(b - a)
case "*":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let a = stack.popLast()!
let b = stack.popLast()!
stack.append(b * a)
case "/":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let a = stack.popLast()!
let b = stack.popLast()!
stack.append(b / a)
default:
guard let number = Double(token) else { throw CalculateError.invalidInput }
stack.append(number)
}
}
guard stack.count == 1 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.components(separatedBy: " ")
var stack = [Double]()
for token in tokens {
switch token {
case "+":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let a = stack.popLast()!
let b = stack.popLast()!
stack.append(b + a)
case "-":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let a = stack.popLast()!
let b = stack.popLast()!
stack.append(b - a)
case "*":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let a = stack.popLast()!
let b = stack.popLast()!
stack.append(b * a)
case "/":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let a = stack.popLast()!
let b = stack.popLast()!
stack.append(b / a)
default:
guard let number = Double(token) else { throw CalculateError.invalidInput }
stack.append(number)
}
}
guard stack.count == 1 else { throw CalculateError.invalidInput }
return stack.popLast()!
}
``` // 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: " ")
var stack = [Double]()
for token in tokens {
switch token {
case "+":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let a = stack.popLast()!
let b = stack.popLast()!
stack.append(b + a)
case "-":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let a = stack.popLast()!
let b = stack.popLast()!
stack.append(b - a)
case "*":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let a = stack.popLast()!
let b = stack.popLast()!
stack.append(b * a)
case "/":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let a = stack.popLast()!
let b = stack.popLast()!
stack.append(b / a)
default:
guard let number = Double(token) else { throw CalculateError.invalidInput }
stack.append(number)
}
}
guard stack.count == 1 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: " ")
var stack = [Double]()
for token in tokens {
switch token {
case "+":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let a = stack.popLast()!
let b = stack.popLast()!
stack.append(b + a)
case "-":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let a = stack.popLast()!
let b = stack.popLast()!
stack.append(b - a)
case "*":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let a = stack.popLast()!
let b = stack.popLast()!
stack.append(b * a)
case "/":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let a = stack.popLast()!
let b = stack.popLast()!
stack.append(b / a)
default:
guard let number = Double(token) else { throw CalculateError.invalidInput }
stack.append(number)
}
}
guard stack.count == 1 else { throw CalculateError.invalidInput }
return stack.popLast()!
}
``` // Fatal error: Error raised at top level: Solution.CalculateError.invalidInputenum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
let tokens = string.components(separatedBy: "()+-*/")
var stack = [Double]()
for token in tokens {
if let number = Double(token) {
stack.append(number)
} else {
switch token {
case "+":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let a = stack.popLast()!
let b = stack.popLast()!
stack.append(b + a)
case "-":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let a = stack.popLast()!
let b = stack.popLast()!
stack.append(b - a)
case "*":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let a = stack.popLast()!
let b = stack.popLast()!
stack.append(b * a)
case "/":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let a = stack.popLast()!
let b = stack.popLast()!
stack.append(b / a)
default:
break
}
}
}
guard stack.count == 1 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.components(separatedBy: "()+-*/")
var stack = [Double]()
for token in tokens {
if let number = Double(token) {
stack.append(number)
} else {
switch token {
case "+":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let a = stack.popLast()!
let b = stack.popLast()!
stack.append(b + a)
case "-":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let a = stack.popLast()!
let b = stack.popLast()!
stack.append(b - a)
case "*":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let a = stack.popLast()!
let b = stack.popLast()!
stack.append(b * a)
case "/":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let a = stack.popLast()!
let b = stack.popLast()!
stack.append(b / a)
default:
break
}
}
}
guard stack.count == 1 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 task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding:.utf8)
let errorPipe = Pipe()
task.standardError = errorPipe
task.terminationHandler = { task in
let errorData = errorPipe.fileHandleForReading.readDataToEndOfFile()
let errorOutput = String(data: errorData, encoding:.utf8)
print(errorOutput!)
}
task.waitUntilExit()
return (output!, errorOutput!)
}```swift
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding:.utf8)
let errorPipe = Pipe()
task.standardError = errorPipe
task.terminationHandler = { task in
let errorData = errorPipe.fileHandleForReading.readDataToEndOfFile()
let errorOutput = String(data: errorData, encoding:.utf8)
print(errorOutput!)
}
task.waitUntilExit()
return (output!, errorOutput!)
}
```return (output!, errorOutput!) // cannot find 'errorOutput' in scopefunc execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding:.utf8)
return (output!, "")
}
func execute(binary: String, arguments: [String]) -> String {
return execute(binary: binary, arguments: arguments).0
}
func execute(binary: String, arguments: [String]) -> String {
return execute(binary: binary, arguments: arguments).1
}
func execute(binary: String, arguments: [String]) -> (String, String) {
return execute(binary: binary, arguments: arguments)
}```swift
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding:.utf8)
return (output!, "")
}
// Execute binary and return stdout.
func execute(binary: String, arguments: [String]) -> String {
return execute(binary: binary, arguments: arguments).0
}
// Execute binary and return stderr.
func execute(binary: String, arguments: [String]) -> String {
return execute(binary: binary, arguments: arguments).1
}
// Execute binary and return stdout and stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
return execute(binary: binary, arguments: arguments)
}
```func execute(binary: String, arguments: [String]) -> String { // invalid redeclaration of 'execute(binary:arguments:)'func execute(binary: String, arguments: [String]) -> (String, String) { // invalid redeclaration of 'execute(binary:arguments:)'func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: String.Encoding.utf8)
return (output!, "")
}
func execute(binary: String, arguments: [String]) -> String {
let (output, _) = execute(binary: binary, arguments: arguments)
return output
}
func execute(binary: String, arguments: [String], error: String) -> String {
let (_, error) = execute(binary: binary, arguments: arguments)
return error
}
func execute(binary: String, arguments: [String]) -> (String, String) {
let (output, error) = execute(binary: binary, arguments: arguments)
return (output, 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 task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: String.Encoding.utf8)
return (output!, "")
}
// 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 execute(binary: String, arguments: [String], error: String) -> String {
let (_, error) = execute(binary: binary, arguments: arguments)
return error
}
// Function to execute binary with arguments and return stdout and stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
let (output, error) = execute(binary: binary, arguments: arguments)
return (output, error)
}
```func execute(binary: String, arguments: [String]) -> (String, String) { // invalid redeclaration of 'execute(binary:arguments:)'func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: String.Encoding.utf8)
let errorPipe = Pipe()
task.standardError = errorPipe
task.launch()
let errorData = errorPipe.fileHandleForReading.readDataToEndOfFile()
let errorOutput = String(data: errorData, encoding: String.Encoding.utf8)
return (output!, errorOutput!)
}```swift
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: String.Encoding.utf8)
let errorPipe = Pipe()
task.standardError = errorPipe
task.launch()
let errorData = errorPipe.fileHandleForReading.readDataToEndOfFile()
let errorOutput = String(data: errorData, encoding: String.Encoding.utf8)
return (output!, errorOutput!)
}
```func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
let stderrPipe = Pipe()
task.standardError = stderrPipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: NSUTF8StringEncoding)
let stderrData = stderrPipe.fileHandleForReading.readDataToEndOfFile()
let stderr = String(data: stderrData, encoding: NSUTF8StringEncoding)
return (output!, stderr!)
}
func execute(binary: String, arguments: [String]) -> String {
let (output, _) = execute(binary, arguments: arguments)
return output
}
func execute(binary: String, arguments: [String], error: NSErrorPointer) -> String {
let (output, stderr) = execute(binary, arguments: arguments)
error.memory = NSError(domain: "com.example.error", code: 1, userInfo: nil)
return stderr
}
func execute(binary: String, arguments: [String], error: NSErrorPointer) -> (String, String) {
let (output, stderr) = execute(binary, arguments: arguments)
error.memory = NSError(domain: "com.example.error", code: 1, userInfo: nil)
return (output, stderr)
}```swift
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
let stderrPipe = Pipe()
task.standardError = stderrPipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: NSUTF8StringEncoding)
let stderrData = stderrPipe.fileHandleForReading.readDataToEndOfFile()
let stderr = String(data: stderrData, encoding: NSUTF8StringEncoding)
return (output!, stderr!)
}
// Execute binary with arguments and return output.
func execute(binary: String, arguments: [String]) -> String {
let (output, _) = execute(binary, arguments: arguments)
return output
}
// Execute binary with arguments and return stderr.
func execute(binary: String, arguments: [String], error: NSErrorPointer) -> String {
let (output, stderr) = execute(binary, arguments: arguments)
error.memory = NSError(domain: "com.example.error", code: 1, userInfo: nil)
return stderr
}
// Execute binary with arguments and return output and error.
func execute(binary: String, arguments: [String], error: NSErrorPointer) -> (String, String) {
let (output, stderr) = execute(binary, arguments: arguments)
error.memory = NSError(domain: "com.example.error", code: 1, userInfo: nil)
return (output, stderr)
}
```let output = String(data: data, encoding: NSUTF8StringEncoding) // cannot convert value of type 'UInt' to expected argument type 'String.Encoding'let stderr = String(data: stderrData, encoding: NSUTF8StringEncoding) // cannot convert value of type 'UInt' to expected argument type 'String.Encoding'let (output, _) = execute(binary, arguments: arguments) // missing argument label 'binary:' in calllet (output, stderr) = execute(binary, arguments: arguments) // missing argument label 'binary:' in callerror.memory = NSError(domain: "com.example.error", code: 1, userInfo: nil) // value of type 'NSErrorPointer' (aka 'Optional<AutoreleasingUnsafeMutablePointer<Optional<NSError>>>') has no member 'memory'let (output, stderr) = execute(binary, arguments: arguments) // missing argument label 'binary:' in callerror.memory = NSError(domain: "com.example.error", code: 1, userInfo: nil) // value of type 'NSErrorPointer' (aka 'Optional<AutoreleasingUnsafeMutablePointer<Optional<NSError>>>') has no member 'memory'func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: String.Encoding.utf8)
return (output!, "")
}```swift
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: String.Encoding.utf8)
return (output!, "")
}
// Execute binary with arguments.
let (stdout, stderr) = execute(binary: "/usr/bin/ls", arguments: ["-l"])
print(stdout)
``` // XCTAssertTrue failedfunc execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: String.Encoding.utf8)!
return (output, "")
}
func execute(binary: String, arguments: [String]) -> String {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: String.Encoding.utf8)!
return output
}```swift
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: String.Encoding.utf8)!
return (output, "")
}
// Function to execute binary with arguments and return stdout.
func execute(binary: String, arguments: [String]) -> String {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: String.Encoding.utf8)!
return output
}
``` // XCTAssertTrue failedfunc execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: String.Encoding.utf8)
return (output!, "")
}```swift
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: String.Encoding.utf8)
return (output!, "")
}
``` // XCTAssertTrue failedfunc execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: String.Encoding.utf8)
return (output!, "")
}```swift
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: String.Encoding.utf8)
return (output!, "")
}
``` // XCTAssertTrue failedfunc execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: String.Encoding.utf8)
return (output!, "")
}```swift
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let pipe = Pipe()
task.standardOutput = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: String.Encoding.utf8)
return (output!, "")
}
// Example of how to execute binary with arguments.
let (output, error) = execute(binary: "/usr/bin/ls", arguments: ["-l"])
``` // XCTAssertTrue failedfunc memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { input in
if let result = cache[input] {
return result
} else {
let result = function(input)
cache[input] = 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 { input in
if let result = cache[input] {
return result
} else {
let result = function(input)
cache[input] = result
return result
}
}
}
```func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { input in
if let value = cache[input] {
return value
}
let value = function(input)
cache[input] = 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 { input in
if let value = cache[input] {
return value
}
let value = function(input)
cache[input] = value
return value
}
}
```func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { input in
if let result = cache[input] {
return result
}
let result = function(input)
cache[input] = 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 { input in
if let result = cache[input] {
return result
}
let result = function(input)
cache[input] = result
return result
}
}
```func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { input in
if let value = cache[input] {
return value
} else {
let value = function(input)
cache[input] = 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 { input in
if let value = cache[input] {
return value
} else {
let value = function(input)
cache[input] = value
return value
}
}
}
```func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { input in
if let result = cache[input] {
return result
} else {
let result = function(input)
cache[input] = 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 { input in
if let result = cache[input] {
return result
} else {
let result = function(input)
cache[input] = result
return result
}
}
}
```func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache: [T: U] = [:]
return { input in
if let result = cache[input] {
return result
}
let result = function(input)
cache[input] = 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 { input in
if let result = cache[input] {
return result
}
let result = function(input)
cache[input] = result
return result
}
}
```func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { input in
if let result = cache[input] {
return result
}
let result = function(input)
cache[input] = 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 { input in
if let result = cache[input] {
return result
}
let result = function(input)
cache[input] = result
return result
}
}
```func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { input in
if let result = cache[input] {
return result
} else {
let result = function(input)
cache[input] = 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 { input in
if let result = cache[input] {
return result
} else {
let result = function(input)
cache[input] = result
return result
}
}
}
```func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { input in
if let result = cache[input] {
return result
} else {
let result = function(input)
cache[input] = 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 { input in
if let result = cache[input] {
return result
} else {
let result = function(input)
cache[input] = result
return result
}
}
}
```func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache: [T: U] = [:]
return { input in
if let result = cache[input] {
return result
} else {
let result = function(input)
cache[input] = 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 { input in
if let result = cache[input] {
return result
} else {
let result = function(input)
cache[input] = result
return result
}
}
}
```func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
return try retry(attempts: attempts, task: task, handler: { _ in })
}```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 {
return try retry(attempts: attempts, task: task, handler: { _ in })
}
```return try retry(attempts: attempts, task: task, handler: { _ in }) // extra argument 'handler' in callfunc retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
return try retry(attempts: attempts, task: task, retryDelay: { _ in })
}```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 {
return try retry(attempts: attempts, task: task, retryDelay: { _ in })
}
```return try retry(attempts: attempts, task: task, retryDelay: { _ in }) // extra argument 'retryDelay' in callfunc retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
return try retry(attempts: attempts, task: task, handler: { _ in })
}```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 {
return try retry(attempts: attempts, task: task, handler: { _ in })
}
```return try retry(attempts: attempts, task: task, handler: { _ in }) // extra argument 'handler' in callfunc retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
return try retry(attempts: attempts, task: task, handler: { _ in })
}```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 {
return try retry(attempts: attempts, task: task, handler: { _ in })
}
```return try retry(attempts: attempts, task: task, handler: { _ in }) // extra argument 'handler' in callfunc retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
return try retry(attempts: attempts, task: task, handler: { _ in })
}```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 {
return try retry(attempts: attempts, task: task, handler: { _ in })
}
```return try retry(attempts: attempts, task: task, handler: { _ in }) // extra argument 'handler' in callfunc retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
return try retry(attempts: attempts, task: task, handler: { _ in })
}
func retry<T>(attempts: Int, task: @escaping () throws -> T, handler: @escaping (Error) -> Void) throws -> T {
return try retry(attempts: attempts, task: task, handler: handler, delay: 0)
}
func retry<T>(attempts: Int, task: @escaping () throws -> T, handler: @escaping (Error) -> Void, delay: TimeInterval) throws -> T {
for _ in 0..<attempts {
do {
return try task()
} catch {
handler(error)
sleep(delay)
}
}
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 {
return try retry(attempts: attempts, task: task, handler: { _ in })
}
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T, handler: @escaping (Error) -> Void) throws -> T {
return try retry(attempts: attempts, task: task, handler: handler, delay: 0)
}
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T, handler: @escaping (Error) -> Void, delay: TimeInterval) throws -> T {
for _ in 0..<attempts {
do {
return try task()
} catch {
handler(error)
sleep(delay)
}
}
throw error
}
```sleep(delay) // cannot convert value of type 'TimeInterval' (aka 'Double') to expected argument type 'UInt32'throw error // expansion of macro 'error' requires leading '#'throw error // thrown expression type '(String) -> ()' does not conform to 'Error'func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
return try retry(attempts: attempts, task: task, handler: { _ in })
}```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 {
return try retry(attempts: attempts, task: task, handler: { _ in })
}
```return try retry(attempts: attempts, task: task, handler: { _ in }) // extra argument 'handler' in callfunc retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
return try retry(attempts: attempts, task: task, handler: { _ in })
}```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 {
return try retry(attempts: attempts, task: task, handler: { _ in })
}
```return try retry(attempts: attempts, task: task, handler: { _ in }) // extra argument 'handler' in callfunc retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
return try retry(attempts: attempts, task: task, handler: { _ in })
}
func retry<T>(attempts: Int, task: @escaping () throws -> T, handler: @escaping (Error) -> Void) throws -> T {
return try retry(attempts: attempts, task: task, handler: handler, delay: 0)
}
func retry<T>(attempts: Int, task: @escaping () throws -> T, handler: @escaping (Error) -> Void, delay: TimeInterval) throws -> T {
return try retry(attempts: attempts, task: task, handler: handler, delay: delay, deadline:.distantFuture)
}```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 {
return try retry(attempts: attempts, task: task, handler: { _ in })
}
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T, handler: @escaping (Error) -> Void) throws -> T {
return try retry(attempts: attempts, task: task, handler: handler, delay: 0)
}
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T, handler: @escaping (Error) -> Void, delay: TimeInterval) throws -> T {
return try retry(attempts: attempts, task: task, handler: handler, delay: delay, deadline:.distantFuture)
}
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T, handler: @escaping (Error) -> Void, delay: TimeInterval, deadline: DispatchTime) throws -> T {
for attempt in 1...attempts {
do {
return try task()
} catch {
if attempt < attempts {
handler(error)
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try? taskreturn try retry(attempts: attempts, task: task, handler: handler, delay: delay, deadline:.distantFuture) // extra argument 'deadline' in callreturn try retry(attempts: attempts, task: task, handler: handler, delay: delay, deadline:.distantFuture) // cannot infer contextual base in reference to member 'distantFuture'func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
return try retry(attempts: attempts, task: task, retryDelay: 0)
}```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 {
return try retry(attempts: attempts, task: task, retryDelay: 0)
}
```return try retry(attempts: attempts, task: task, retryDelay: 0) // extra argument 'retryDelay' in callprotocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
class DIContainer: DIContainerProtocol {
private var factories: [Any.Type: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[type] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
return factories[type] 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: [Any.Type: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[type] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
return factories[type] as? () -> T
}
}
```private var factories: [Any.Type: () -> Any] = [:] // type 'any Any.Type' does not conform to protocol 'Hashable'factories[type] = factory // type 'any Any.Type' cannot conform to 'Hashable'return factories[type] as? () -> T // type 'any Any.Type' cannot conform to 'Hashable'return factories[type] as? () -> T // cannot convert return expression of type '(() -> T)?' to return type '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: [Any.Type: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[type] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
return factories[type] 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: [Any.Type: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[type] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
return factories[type] as? () -> T
}
}
```private var factories: [Any.Type: () -> Any] = [:] // type 'any Any.Type' does not conform to protocol 'Hashable'factories[type] = factory // type 'any Any.Type' cannot conform to 'Hashable'return factories[type] as? () -> T // type 'any Any.Type' cannot conform to 'Hashable'return factories[type] as? () -> T // cannot convert return expression of type '(() -> T)?' to return type '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: [Any.Type: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[type] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
return factories[type] as? () -> T
}
}
class Example {
private let container = DIContainer()
func example() {
container.register(SomeClass.self) { SomeClass() }
container.register(SomeOtherClass.self) { SomeOtherClass() }
let someClass = container.resolve(SomeClass.self)
let someOtherClass = container.resolve(SomeOtherClass.self)
}
}```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: [Any.Type: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[type] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
return factories[type] as? () -> T
}
}
// Example of using DIContainer
class Example {
private let container = DIContainer()
func example() {
container.register(SomeClass.self) { SomeClass() }
container.register(SomeOtherClass.self) { SomeOtherClass() }
let someClass = container.resolve(SomeClass.self)
let someOtherClass = container.resolve(SomeOtherClass.self)
}
}
```private var factories: [Any.Type: () -> Any] = [:] // type 'any Any.Type' does not conform to protocol 'Hashable'factories[type] = factory // type 'any Any.Type' cannot conform to 'Hashable'return factories[type] as? () -> T // type 'any Any.Type' cannot conform to 'Hashable'return factories[type] as? () -> T // cannot convert return expression of type '(() -> T)?' to return type 'T?'container.register(SomeClass.self) { SomeClass() } // cannot find 'SomeClass' in scopecontainer.register(SomeClass.self) { SomeClass() } // cannot find 'SomeClass' in scopecontainer.register(SomeOtherClass.self) { SomeOtherClass() } // cannot find 'SomeOtherClass' in scopecontainer.register(SomeOtherClass.self) { SomeOtherClass() } // cannot find 'SomeOtherClass' in scopelet someClass = container.resolve(SomeClass.self) // generic parameter 'T' could not be inferredlet someClass = container.resolve(SomeClass.self) // cannot find 'SomeClass' in scopelet someOtherClass = container.resolve(SomeOtherClass.self) // generic parameter 'T' could not be inferredlet someOtherClass = container.resolve(SomeOtherClass.self) // cannot find 'SomeOtherClass' 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: [Any.Type: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[type] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
return factories[type] as? () -> T
}
}
class DIContainer {
private var factories: [Any.Type: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[type] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
return factories[type] 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: [Any.Type: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[type] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
return factories[type] as? () -> T
}
}
// Simple dependency injection (DI) container.
class DIContainer {
private var factories: [Any.Type: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[type] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
return factories[type] as? () -> T
}
}
```private var factories: [Any.Type: () -> Any] = [:] // type 'any Any.Type' does not conform to protocol 'Hashable'factories[type] = factory // type 'any Any.Type' cannot conform to 'Hashable'return factories[type] as? () -> T // type 'any Any.Type' cannot conform to 'Hashable'return factories[type] as? () -> T // cannot convert return expression of type '(() -> T)?' to return type 'T?'class DIContainer { // invalid redeclaration of 'DIContainer'private var factories: [Any.Type: () -> Any] = [:] // type 'any Any.Type' does not conform to protocol 'Hashable'factories[type] = factory // type 'any Any.Type' cannot conform to 'Hashable'return factories[type] as? () -> T // cannot convert return expression of type '(() -> T)?' to return type 'T?'return factories[type] as? () -> T // type 'any Any.Type' cannot conform to 'Hashable'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? {
let factory = factories[String(describing: type)]
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? {
let factory = factories[String(describing: type)]
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: [Any.Type: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[type] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
return factories[type] 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: [Any.Type: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[type] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
return factories[type] as? T
}
}
```private var factories: [Any.Type: () -> Any] = [:] // type 'any Any.Type' does not conform to protocol 'Hashable'factories[type] = factory // type 'any Any.Type' cannot conform to 'Hashable'return factories[type] as? T // type 'any Any.Type' cannot conform to 'Hashable'protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
class DIContainer: DIContainerProtocol {
private var factories: [AnyHashable: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[type] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
return factories[type] 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: [AnyHashable: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[type] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
return factories[type] as? () -> T
}
}
```factories[type] = factory // argument type 'T.Type' does not conform to expected type 'Hashable'return factories[type] as? () -> T // cast from '(key: AnyHashable, value: () -> Any)' to unrelated type '() -> T' always failsreturn factories[type] as? () -> T // cannot convert value of type 'T.Type' to expected argument type 'Dictionary<AnyHashable, () -> Any>.Index'return factories[type] as? () -> T // cannot convert return expression of type '(() -> T)?' to return type '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: [Any.Type: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[type] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
return factories[type] 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: [Any.Type: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[type] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
return factories[type] as? T
}
}
```private var factories: [Any.Type: () -> Any] = [:] // type 'any Any.Type' does not conform to protocol 'Hashable'factories[type] = factory // type 'any Any.Type' cannot conform to 'Hashable'return factories[type] as? T // type 'any Any.Type' cannot conform to 'Hashable'protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
class DIContainer: DIContainerProtocol {
private var factories: [AnyHashable: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[type] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
return factories[type] as? () -> T
}
}
class Example {
private let container: DIContainerProtocol
init(container: DIContainerProtocol) {
self.container = container
}
func doSomething() {
let service = container.resolve(Service.self)
service?.doSomething()
}
}
class Service {
func doSomething() {
print("Do something")
}
}```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: [AnyHashable: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[type] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
return factories[type] as? () -> T
}
}
// MARK: - Example
class Example {
private let container: DIContainerProtocol
init(container: DIContainerProtocol) {
self.container = container
}
func doSomething() {
let service = container.resolve(Service.self)
service?.doSomething()
}
}
class Service {
func doSomething() {
print("Do something")
}
}
let container = DIContainer()
container.register(Service.self, factory: { Service() })
let example = Example(container: container)
example.doSomething()
```factories[type] = factory // argument type 'T.Type' does not conform to expected type 'Hashable'return factories[type] as? () -> T // cast from '(key: AnyHashable, value: () -> Any)' to unrelated type '() -> T' always failsreturn factories[type] as? () -> T // cannot convert value of type 'T.Type' to expected argument type 'Dictionary<AnyHashable, () -> Any>.Index'return factories[type] as? () -> T // cannot convert return expression of type '(() -> T)?' to return type 'T?'protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
class DIContainer: DIContainerProtocol {
private var registeredTypes: [String: Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
registeredTypes[String(describing: type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
let typeName = String(describing: type)
if let factory = registeredTypes[typeName] as? () -> T {
return factory()
}
return nil
}
}```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 registeredTypes: [String: Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
registeredTypes[String(describing: type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
let typeName = String(describing: type)
if let factory = registeredTypes[typeName] as? () -> T {
return factory()
}
return nil
}
}
```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: [State: [Event: State]]] = [:]
private var transitionQueue: [Event] = []
required init(state: State) {
self.state = state
}
var currentState: State {
return state
}
func trigger(event: Event) {
transitionQueue.append(event)
while let event = transitionQueue.first {
transitionQueue.removeFirst()
guard let nextState = transitions[state]?[state]?[event] else {
return
}
state = nextState
}
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from]?[to]?[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: [State: [Event: State]]] = [:]
private var transitionQueue: [Event] = []
required init(state: State) {
self.state = state
}
var currentState: State {
return state
}
func trigger(event: Event) {
transitionQueue.append(event)
while let event = transitionQueue.first {
transitionQueue.removeFirst()
guard let nextState = transitions[state]?[state]?[event] else {
return
}
state = nextState
}
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from]?[to]?[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]] = [:]
private var transitionQueue: [Event] = []
init(state: State) {
self.state = state
}
var state: State {
return self.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] = transitions[from]?? [:]
transitions[from]![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]] = [:]
private var transitionQueue: [Event] = []
init(state: State) {
self.state = state
}
var state: State {
return self.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] = transitions[from]?? [:]
transitions[from]![event] = to
}
}
```private var state: State // property 'state' must be declared internal because it matches a requirement in internal protocol 'StateMachineProtocol'init(state: State) { // initializer requirement 'init(state:)' can only be satisfied by a 'required' initializer in non-final class 'StateMachine<State, Event>'var state: State { // invalid redeclaration of 'state'transitions[from] = transitions[from]?? [:] // expected expression in list of expressionstransitions[from] = transitions[from]?? [:] // cannot use optional chaining on non-optional value of type '[Event : State]'transitions[from] = transitions[from]?? [:] // missing argument for parameter #1 in subscriptprotocol 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: [State: [Event: State]]] = [:]
private var eventHandlers: [State: [Event: (Event) -> Void]] = [:]
required init(state: State) {
self.state = state
}
var state: State {
return self.state
}
func trigger(event: Event) {
guard let nextState = transitions[state]?[event] else {
return
}
state = nextState
eventHandlers[state]?[event](event)
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from]?[to]?[event] = to
}
func registerEventHandler(for state: State, event: Event, handler: @escaping (Event) -> Void) {
eventHandlers[state]?[event] = handler
}
}```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: [State: [Event: State]]] = [:]
private var eventHandlers: [State: [Event: (Event) -> Void]] = [:]
required init(state: State) {
self.state = state
}
var state: State {
return self.state
}
func trigger(event: Event) {
guard let nextState = transitions[state]?[event] else {
return
}
state = nextState
eventHandlers[state]?[event](event)
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from]?[to]?[event] = to
}
func registerEventHandler(for state: State, event: Event, handler: @escaping (Event) -> Void) {
eventHandlers[state]?[event] = handler
}
}
```private var state: State // property 'state' must be declared internal because it matches a requirement in internal protocol 'StateMachineProtocol'var state: State { // invalid redeclaration of 'state'guard let nextState = transitions[state]?[event] else { // subscript 'subscript(_:)' requires that 'Event' conform to 'RangeExpression'eventHandlers[state]?[event](event) // value of optional type '((Event) -> Void)?' must be unwrapped to a value of type '(Event) -> Void'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: [State: [Event: State]]] = [:]
required init(state: State) {
self.state = state
}
var currentState: State {
return state
}
func trigger(event: Event) {
guard let nextState = transitions[state]?[state]?[event] else {
return
}
state = nextState
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from]?[to]?[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: [State: [Event: State]]] = [:]
required init(state: State) {
self.state = state
}
var currentState: State {
return state
}
func trigger(event: Event) {
guard let nextState = transitions[state]?[state]?[event] else {
return
}
state = nextState
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from]?[to]?[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: [State: [Event: ()]]] = [:]
required init(state: State) {
self.state = state
}
var state: State {
return self.state
}
func trigger(event: Event) {
guard let transition = transitions[state]?[state]?[event] else {
return
}
transition()
state = state
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from]?[to]?[event] = { [weak self] in
self?.state = 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: [State: [Event: ()]]] = [:]
required init(state: State) {
self.state = state
}
var state: State {
return self.state
}
func trigger(event: Event) {
guard let transition = transitions[state]?[state]?[event] else {
return
}
transition()
state = state
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from]?[to]?[event] = { [weak self] in
self?.state = to
}
}
}
```private var state: State // property 'state' must be declared internal because it matches a requirement in internal protocol 'StateMachineProtocol'var state: State { // invalid redeclaration of 'state'transition() // cannot call value of non-function type '()'state = state // assigning a property to itselftransitions[from]?[to]?[event] = { [weak self] in // function produces expected type '()?'; did you mean to call it with '()'?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: [State: [Event: State]]] = [:]
private var transitionQueue: [State: [Event: State]] = [:]
required init(state: State) {
self.state = state
}
var state: State {
return self.state
}
func trigger(event: Event) {
guard let transition = transitions[state]?[event] else {
return
}
state = transition
transitionQueue = [:]
}
func registerTransition(from: State, to: State, event: Event) {
transitionQueue[from] = transitionQueue[from]?? [:]
transitionQueue[from]![event] = to
}
func performTransitions() {
for (from, events) in transitionQueue {
for (event, to) in events {
transitions[from]?[event] = to
}
}
transitionQueue = [:]
}
}```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: [State: [Event: State]]] = [:]
private var transitionQueue: [State: [Event: State]] = [:]
required init(state: State) {
self.state = state
}
var state: State {
return self.state
}
func trigger(event: Event) {
guard let transition = transitions[state]?[event] else {
return
}
state = transition
transitionQueue = [:]
}
func registerTransition(from: State, to: State, event: Event) {
transitionQueue[from] = transitionQueue[from]?? [:]
transitionQueue[from]![event] = to
}
func performTransitions() {
for (from, events) in transitionQueue {
for (event, to) in events {
transitions[from]?[event] = to
}
}
transitionQueue = [:]
}
}
```private var state: State // property 'state' must be declared internal because it matches a requirement in internal protocol 'StateMachineProtocol'var state: State { // invalid redeclaration of 'state'guard let transition = transitions[state]?[event] else { // subscript 'subscript(_:)' requires that 'Event' conform to 'RangeExpression'transitionQueue[from] = transitionQueue[from]?? [:] // missing argument for parameter #1 in subscripttransitionQueue[from] = transitionQueue[from]?? [:] // expected expression in list of expressionstransitionQueue[from] = transitionQueue[from]?? [:] // cannot use optional chaining on non-optional value of type '[Event : State]'transitions[from]?[event] = to // cannot convert value of type 'Event' to expected argument type 'State'transitions[from]?[event] = to // cannot assign value of type 'State' to subscript of type '[Event : State]'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: [State: [Event: State]]] = [:]
required init(state: State) {
self.state = state
}
var currentState: State {
return state
}
func trigger(event: Event) {
guard let nextState = transitions[state]?[state]?[event] else {
return
}
state = nextState
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from]?[to]?[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: [State: [Event: State]]] = [:]
required init(state: State) {
self.state = state
}
var currentState: State {
return state
}
func trigger(event: Event) {
guard let nextState = transitions[state]?[state]?[event] else {
return
}
state = nextState
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from]?[to]?[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: [State: [Event: State]]] = [:]
private var eventHandlers: [State: [Event: (Event) -> Void]] = [:]
required init(state: State) {
self.state = state
}
var currentState: State {
return state
}
func trigger(event: Event) {
guard let nextState = transitions[state]?[event] else {
return
}
state = nextState
eventHandlers[state]?[event](event)
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from]?[to]?[event] = to
}
func registerEventHandler(for state: State, event: Event, handler: @escaping (Event) -> Void) {
eventHandlers[state]?[event] = handler
}
}```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: [State: [Event: State]]] = [:]
private var eventHandlers: [State: [Event: (Event) -> Void]] = [:]
required init(state: State) {
self.state = state
}
var currentState: State {
return state
}
func trigger(event: Event) {
guard let nextState = transitions[state]?[event] else {
return
}
state = nextState
eventHandlers[state]?[event](event)
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from]?[to]?[event] = to
}
func registerEventHandler(for state: State, event: Event, handler: @escaping (Event) -> Void) {
eventHandlers[state]?[event] = handler
}
}
```private var state: State // property 'state' must be declared internal because it matches a requirement in internal protocol 'StateMachineProtocol'guard let nextState = transitions[state]?[event] else { // subscript 'subscript(_:)' requires that 'Event' conform to 'RangeExpression'eventHandlers[state]?[event](event) // value of optional type '((Event) -> Void)?' must be unwrapped to a value of type '(Event) -> Void'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 transitions: [State: [State: [Event: State]]] = [:]
private var state: State
init(state: State) {
self.state = state
}
var state: State {
return self.state
}
func trigger(event: Event) {
guard let nextState = transitions[state]?[state]?[event] else {
return
}
state = nextState
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from]?[to]?[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 transitions: [State: [State: [Event: State]]] = [:]
private var state: State
init(state: State) {
self.state = state
}
var state: State {
return self.state
}
func trigger(event: Event) {
guard let nextState = transitions[state]?[state]?[event] else {
return
}
state = nextState
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from]?[to]?[event] = to
}
}
```private var state: State // property 'state' must be declared internal because it matches a requirement in internal protocol 'StateMachineProtocol'init(state: State) { // initializer requirement 'init(state:)' can only be satisfied by a 'required' initializer in non-final class 'StateMachine<State, Event>'var state: State { // invalid redeclaration of 'state'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: [State: [Event: State]]] = [:]
required init(state: State) {
self.state = state
}
var state: State {
return self.state
}
func trigger(event: Event) {
guard let transition = transitions[state]?[state]?[event] else {
return
}
state = transition
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from]?[to]?[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: [State: [Event: State]]] = [:]
required init(state: State) {
self.state = state
}
var state: State {
return self.state
}
func trigger(event: Event) {
guard let transition = transitions[state]?[state]?[event] else {
return
}
state = transition
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from]?[to]?[event] = to
}
}
```private var state: State // property 'state' must be declared internal because it matches a requirement in internal protocol 'StateMachineProtocol'var state: State { // invalid redeclaration of 'state'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 name, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case.file:
return 0
case.directory(let name, let contents):
return 1 + contents.map { $0.treeDepth }.max()?? 0
}
}
}```swift
indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case.file(let 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 name, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case.file:
return 0
case.directory(let name, let contents):
return 1 + contents.map { $0.treeDepth }.max()?? 0
}
}
}
let root = FileSystemNode.directory(name: "root", contents: [
.directory(name: "dir1", contents: [
.file(name: "file1", size: 1),
.file(name: "file2", size: 2),
.file(name: "file3", size: 3),
.directory(name: "dir2", contents: [
.file(name: "file4", size: 4),
.file(name: "file5", size: 5),
.file(name: "file6", size: 6),
.directory(name: "dir3", contents: [
.file(name: "file7", size: 7),
.file(name: "file8", size: 8),
.file(name: "file9", size: 9),
.directory(name: "dir4", contents: [
.file(name: "file10", size: 10),
.file(name: "file11", size: 11),
.file(name: "file12", size: 12),
.directory(name: "dir5", contents: [
.file(name: "file13", size: 13),
.file(name: "file14", size: 14),
.file(name: "file15", size: 15),
.directory(name: "dir6", contents: [
.file(name: "file16", size: 16),
.file(name: "file17", size: 17),
.file(name: "file18", size: 18),
.directory(name: "dir7", contents: [
.file(name: "file19", size: 19),
.file(name: "file20", size: 20),
.file(name: "file21", size: 21),
.directory(name: "dir8", contents: [
.file(name: "file22", size: 22),
.file(name: "file23", size: 23),
.file(name: "file24", size: 24),
.directory(name: "dir9", contents: [
.file(name: "file25", size: 25),
.file(name: "file26", size: 26),
.file(name: "file27", size: 27),
.directory(name: "dir10", contents: [
.file(name: "file28", size: 28),
.file(name: "file29", size: 29),
.file(name: "file30", size: 30),
.directory(name: "dir11", contents: [
.file(name: "file31", size: 31),
.file(name: "file32", size: 32),
.file(name: "file33", size: 33),
.directory(name: "dir12", contents: [
.file(name: "file34", size: 34),
.file(name: "file35", size: 35),
.file(name: "file36", size: 36),
.directory(name: "dir13", contents: [
.file(name: "file37", size: 37),
.file(name: "file38", size: 38),
.file(name: "file39", size: 39),
.directory(name: "dir14", contents: [
.file(name: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.directory(let name, let contents): // immutable value 'name' was never used; consider replacing with '_' or removing itreturn 1 + contents.map { $0.treeDepth }.max()?? 0 // value of optional type 'Int?' must be unwrapped to a value of type 'Int'return 1 + contents.map { $0.treeDepth }.max()?? 0 // integer literal is unusedreturn 1 + contents.map { $0.treeDepth }.max()?? 0 // cannot use optional chaining on non-optional value of type 'Int'return 1 + 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 name, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case.file:
return 0
case.directory(let name, let contents):
return 1 + contents.map { $0.treeDepth }.max()?? 0
}
}
}```swift
indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case.file(let 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 name, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case.file:
return 0
case.directory(let name, let contents):
return 1 + contents.map { $0.treeDepth }.max()?? 0
}
}
}
```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.directory(let name, let contents): // immutable value 'name' was never used; consider replacing with '_' or removing itreturn 1 + contents.map { $0.treeDepth }.max()?? 0 // value of optional type 'Int?' must be unwrapped to a value of type 'Int'return 1 + contents.map { $0.treeDepth }.max()?? 0 // integer literal is unusedreturn 1 + contents.map { $0.treeDepth }.max()?? 0 // cannot use optional chaining on non-optional value of type 'Int'return 1 + 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 name, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case.file:
return 0
case.directory(let name, let contents):
return 1 + contents.map { $0.treeDepth }.max()?? 0
}
}
}
struct FileSystemManager {
private var 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.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 name, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case.file:
return 0
case.directory(let name, let contents):
return 1 + contents.map { $0.treeDepth }.max()?? 0
}
}
}
// File system manager that can be used to calculate total size of all files in file system, files count and file system tree depth.
struct FileSystemManager {
private var 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
}
}
```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.directory(let name, let contents): // immutable value 'name' was never used; consider replacing with '_' or removing itreturn 1 + contents.map { $0.treeDepth }.max()?? 0 // value of optional type 'Int?' must be unwrapped to a value of type 'Int'return 1 + contents.map { $0.treeDepth }.max()?? 0 // integer literal is unusedreturn 1 + contents.map { $0.treeDepth }.max()?? 0 // cannot use optional chaining on non-optional value of type 'Int'return 1 + 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 name, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case.file:
return 1
case.directory(let name, let contents):
return max(contents.map { $0.treeDepth }.max()?? 0, 1)
}
}
}
class FileSystemManager {
private var 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.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 name, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case.file:
return 1
case.directory(let name, let contents):
return max(contents.map { $0.treeDepth }.max()?? 0, 1)
}
}
}
// File system manager implementation.
class FileSystemManager {
private var 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
}
}
```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.directory(let name, let contents): // immutable value 'name' was never used; consider replacing with '_' or removing itreturn max(contents.map { $0.treeDepth }.max()?? 0, 1) // cannot use optional chaining on non-optional value of type 'Int'return max(contents.map { $0.treeDepth }.max()?? 0, 1) // value of optional type 'Int?' must be unwrapped to a value of type 'Int'return max(contents.map { $0.treeDepth }.max()?? 0, 1) // expected ',' separatorindirect 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(_, _):
return 1
case let.directory(_, contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case let.file(_, _):
return 0
case let.directory(_, contents):
return 1 + contents.map { $0.treeDepth }.max()?? 0
}
}
}```swift
indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case 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(_, _):
return 1
case let.directory(_, contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case let.file(_, _):
return 0
case let.directory(_, contents):
return 1 + contents.map { $0.treeDepth }.max()?? 0
}
}
}
```case 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(_, _): // 'let' pattern has no effect; sub-pattern didn't bind any variablescase let.file(_, _): // 'let' pattern has no effect; sub-pattern didn't bind any variablesreturn 1 + contents.map { $0.treeDepth }.max()?? 0 // value of optional type 'Int?' must be unwrapped to a value of type 'Int'return 1 + contents.map { $0.treeDepth }.max()?? 0 // integer literal is unusedreturn 1 + contents.map { $0.treeDepth }.max()?? 0 // cannot use optional chaining on non-optional value of type 'Int'return 1 + 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 name, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case.file:
return 1
case.directory(let name, let contents):
return 1 + contents.map { $0.treeDepth }.max()?? 0
}
}
}
struct FileSystemManager {
private var root: FileSystemNode
init(root: FileSystemNode) {
self.root = root
}
var totalSize: Int {
return root.totalSize
}
var filesCount: Int {
return root.filesCount
}
var 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.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 name, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case.file:
return 1
case.directory(let name, let contents):
return 1 + contents.map { $0.treeDepth }.max()?? 0
}
}
}
// File system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
struct FileSystemManager {
private var root: FileSystemNode
init(root: FileSystemNode) {
self.root = root
}
var totalSize: Int {
return root.totalSize
}
var filesCount: Int {
return root.filesCount
}
var treeDepth: Int {
return root.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.directory(let name, let contents): // immutable value 'name' was never used; consider replacing with '_' or removing itreturn 1 + contents.map { $0.treeDepth }.max()?? 0 // value of optional type 'Int?' must be unwrapped to a value of type 'Int'return 1 + contents.map { $0.treeDepth }.max()?? 0 // integer literal is unusedreturn 1 + contents.map { $0.treeDepth }.max()?? 0 // cannot use optional chaining on non-optional value of type 'Int'return 1 + 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 name, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case.file:
return 0
case.directory(let name, let contents):
return 1 + contents.map { $0.treeDepth }.max()?? 0
}
}
}
extension FileSystemNode {
func calculate() -> FileSystemInfo {
return self
}
}```swift
indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case.file(let 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 name, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case.file:
return 0
case.directory(let name, let contents):
return 1 + contents.map { $0.treeDepth }.max()?? 0
}
}
}
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode {
func calculate() -> FileSystemInfo {
return self
}
}
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode {
func calculate() -> FileSystemInfo {
return self
}
}
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode {
func calculate() -> FileSystemInfo {
return self
}
}
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode {
func calculate() -> FileSystemInfo {
return self
}
}
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode {
func calculate() -> FileSystemInfo {
return self
}
}
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode {
func calculate() -> FileSystemInfo {
return self
}
}
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode {
func calculate() -> FileSystemInfo {
return self
}
}
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode {
func calculate() -> FileSystemInfo {
return self
}
}
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode {
func calculate() -> FileSystemInfo {
return self
}
}
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode {
func calculate() -> FileSystemInfo {
return self
}
}
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode {
func calculate() -> FileSystemInfo {
return self
}
}
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode {
func calculate() -> FileSystemInfo {
return self
}
}
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode {
func calculate() -> FileSystemInfo {
return self
}
}
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode {
func calculate() -> FileSystemInfo {
return self
}
}
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode {
func calculate() -> FileSystemInfo {
return self
}
}
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode {
func calculate() -> FileSystemInfo {
return self
}
}
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode {
func calculate() -> FileSystemInfo {
return self
}
}
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode {
func calculate() -> FileSystemInfo {
return self
}
}
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode {
func calculate() -> FileSystemInfo {
return self
}
}
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode {
func calculate() -> FileSystemInfo {
return selfcase.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.directory(let name, let contents): // immutable value 'name' was never used; consider replacing with '_' or removing itreturn 1 + contents.map { $0.treeDepth }.max()?? 0 // value of optional type 'Int?' must be unwrapped to a value of type 'Int'return 1 + contents.map { $0.treeDepth }.max()?? 0 // integer literal is unusedreturn 1 + contents.map { $0.treeDepth }.max()?? 0 // cannot use optional chaining on non-optional value of type 'Int'return 1 + 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 name, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case.file:
return 0
case.directory(let name, let contents):
return 1 + contents.map { $0.treeDepth }.max()?? 0
}
}
}```swift
indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case.file(let 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 name, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case.file:
return 0
case.directory(let name, let contents):
return 1 + contents.map { $0.treeDepth }.max()?? 0
}
}
}
```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.directory(let name, let contents): // immutable value 'name' was never used; consider replacing with '_' or removing itreturn 1 + contents.map { $0.treeDepth }.max()?? 0 // value of optional type 'Int?' must be unwrapped to a value of type 'Int'return 1 + contents.map { $0.treeDepth }.max()?? 0 // integer literal is unusedreturn 1 + contents.map { $0.treeDepth }.max()?? 0 // cannot use optional chaining on non-optional value of type 'Int'return 1 + 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 name, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case.file:
return 0
case.directory(let name, let contents):
return 1 + contents.map { $0.treeDepth }.max()?? 0
}
}
}```swift
indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case.file(let 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 name, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case.file:
return 0
case.directory(let name, let contents):
return 1 + contents.map { $0.treeDepth }.max()?? 0
}
}
}
```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.directory(let name, let contents): // immutable value 'name' was never used; consider replacing with '_' or removing itreturn 1 + contents.map { $0.treeDepth }.max()?? 0 // value of optional type 'Int?' must be unwrapped to a value of type 'Int'return 1 + contents.map { $0.treeDepth }.max()?? 0 // integer literal is unusedreturn 1 + contents.map { $0.treeDepth }.max()?? 0 // cannot use optional chaining on non-optional value of type 'Int'return 1 + 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 name, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case.file:
return 0
case.directory(let name, let contents):
return max(contents.map { $0.treeDepth }.max()?? 0, 1)
}
}
}
class FileSystemManager {
private let root: FileSystemNode
init(root: FileSystemNode) {
self.root = root
}
func calculateTotalSize() -> Int {
return root.totalSize
}
func calculateFilesCount() -> Int {
return root.filesCount
}
func calculateTreeDepth() -> 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.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 name, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case.file:
return 0
case.directory(let name, let contents):
return max(contents.map { $0.treeDepth }.max()?? 0, 1)
}
}
}
// File system manager implementation.
class FileSystemManager {
private let root: FileSystemNode
init(root: FileSystemNode) {
self.root = root
}
func calculateTotalSize() -> Int {
return root.totalSize
}
func calculateFilesCount() -> Int {
return root.filesCount
}
func calculateTreeDepth() -> Int {
return root.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.directory(let name, let contents): // immutable value 'name' was never used; consider replacing with '_' or removing itreturn max(contents.map { $0.treeDepth }.max()?? 0, 1) // cannot use optional chaining on non-optional value of type 'Int'return max(contents.map { $0.treeDepth }.max()?? 0, 1) // value of optional type 'Int?' must be unwrapped to a value of type 'Int'return max(contents.map { $0.treeDepth }.max()?? 0, 1) // expected ',' separatorprotocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
class Stack<Element>: StackProtocol {
var stack: [Element] = []
init() {}
func push(_ element: Element) {
stack.append(element)
}
func pop() -> Element? {
return stack.popLast()
}
}
class Stack<Element> {
var stack: [Element] = []
init() {}
func push(_ element: Element) {
stack.append(element)
}
func pop() -> Element? {
return stack.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 stack: [Element] = []
init() {}
func push(_ element: Element) {
stack.append(element)
}
func pop() -> Element? {
return stack.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element> {
var stack: [Element] = []
init() {}
func push(_ element: Element) {
stack.append(element)
}
func pop() -> Element? {
return stack.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element> {
var stack: [Element] = []
init() {}
func push(_ element: Element) {
stack.append(element)
}
func pop() -> Element? {
return stack.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element> {
var stack: [Element] = []
init() {}
func push(_ element: Element) {
stack.append(element)
}
func pop() -> Element? {
return stack.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element> {
var stack: [Element] = []
init() {}
func push(_ element: Element) {
stack.append(element)
}
func pop() -> Element? {
return stack.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element> {
var stack: [Element] = []
init() {}
func push(_ element: Element) {
stack.append(element)
}
func pop() -> Element? {
return stack.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element> {
var stack: [Element] = []
init() {}
func push(_ element: Element) {
stack.append(element)
}
func pop() -> Element? {
return stack.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element> {
var stack: [Element] = []
init() {}
func push(_ element: Element) {
stack.append(element)
}
func pop() -> Element? {
return stack.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element> {
var stack: [Element] = []
init() {}
func push(_ element: Element) {
stack.append(element)
}
func pop() -> Element? {
return stack.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element> {
var stack: [Element] = []
init() {}
func push(_ element: Element) {
stack.append(element)
}
func pop() -> Element? {
return stack.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element> {
var stack: [Element] = []
init() {}
func push(_ element: Element) {
stack.append(element)
}
func pop() -> Element? {
return stack.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element> {
var stack: [Element] = []
init() {}
func push(_ element: Element) {
stack.append(element)
}
func pop() -> Element? {
return stack.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element> {
var stack: [Element] = []
init() {}
func push(_ element: Element) {
stack.append(element)
}
func pop() -> Element? {
return stack.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element> {
var stack: [Element] = []
init() {}
func push(_ element: Element) {
stack.append(element)
}
func pop() -> Element? {
return stack.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element> {
var stack: [Element] = []
init() {}
func push(_ element: Element) {
stack.append(element)
}
func pop() -> Element? {
return stack.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack<Element>'class Stack<Element> { // invalid redeclaration of 'Stack'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 elements = [Element]()
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class Stack2<Element>: StackProtocol {
var elements = [Element]()
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class Stack3<Element>: StackProtocol {
var elements = [Element]()
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class Stack4<Element>: StackProtocol {
var elements = [Element]()
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class Stack5<Element>: StackProtocol {
var elements = [Element]()
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class Stack6<Element>: StackProtocol {
var elements = [Element]()
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class Stack7<Element>: StackProtocol {
var elements = [Element]()
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class Stack8<Element>: StackProtocol {
var elements = [Element]()
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class Stack9<Element>: StackProtocol {
var elements = [Element]()
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class Stack10<Element>: StackProtocol {
var elements = [Element]()
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class Stack11<Element>: StackProtocol {
var elements = [Element]()
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class Stack12<Element>: StackProtocol {
var elements = [Element]()
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class Stack13<Element>: StackProtocol {
var elements = [Element]()
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class Stack14<Element>: StackProtocol {
var elements = [Element]()
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
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 {
var elements = [Element]()
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack2<Element>: StackProtocol {
var elements = [Element]()
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack3<Element>: StackProtocol {
var elements = [Element]()
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack4<Element>: StackProtocol {
var elements = [Element]()
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack5<Element>: StackProtocol {
var elements = [Element]()
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack6<Element>: StackProtocol {
var elements = [Element]()
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack7<Element>: StackProtocol {
var elements = [Element]()
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack8<Element>: StackProtocol {
var elements = [Element]()
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack9<Element>: StackProtocol {
var elements = [Element]()
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack10<Element>: StackProtocol {
var elements = [Element]()
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack11<Element>: StackProtocol {
var elements = [Element]()
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack12<Element>: StackProtocol {
var elements = [Element]()
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack13<Element>: StackProtocol {
var elements = [Element]()
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack14<Element>: StackProtocol {
var elements = [Element]()
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack15<Element>: StackProtocol {
var elements = [Element]()
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack<Element>'init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack2<Element>'init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack3<Element>'init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack4<Element>'init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack5<Element>'init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack6<Element>'init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack7<Element>'init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack8<Element>'init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack9<Element>'init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack10<Element>'init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack11<Element>'init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack12<Element>'init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack13<Element>'init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack14<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 {
private var array = [Element]()
func push(_ element: Element) {
array.append(element)
}
func pop() -> Element? {
return array.popLast()
}
}
class Stack<Element> {
private var array = [Element]()
func push(_ element: Element) {
array.append(element)
}
func pop() -> Element? {
return array.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 array = [Element]()
func push(_ element: Element) {
array.append(element)
}
func pop() -> Element? {
return array.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element> {
private var array = [Element]()
func push(_ element: Element) {
array.append(element)
}
func pop() -> Element? {
return array.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element> {
private var array = [Element]()
func push(_ element: Element) {
array.append(element)
}
func pop() -> Element? {
return array.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element> {
private var array = [Element]()
func push(_ element: Element) {
array.append(element)
}
func pop() -> Element? {
return array.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element> {
private var array = [Element]()
func push(_ element: Element) {
array.append(element)
}
func pop() -> Element? {
return array.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element> {
private var array = [Element]()
func push(_ element: Element) {
array.append(element)
}
func pop() -> Element? {
return array.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element> {
private var array = [Element]()
func push(_ element: Element) {
array.append(element)
}
func pop() -> Element? {
return array.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element> {
private var array = [Element]()
func push(_ element: Element) {
array.append(element)
}
func pop() -> Element? {
return array.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element> {
private var array = [Element]()
func push(_ element: Element) {
array.append(element)
}
func pop() -> Element? {
return array.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element> {
private var array = [Element]()
func push(_ element: Element) {
array.append(element)
}
func pop() -> Element? {
return array.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element> {
private var array = [Element]()
func push(_ element: Element) {
array.append(element)
}
func pop() -> Element? {
return array.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element> {
private var array = [Element]()
func push(_ element: Element) {
array.append(element)
}
func pop() -> Element? {
return array.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element> {
private var array = [Element]()
func push(_ element: Element) {
array.append(element)
}
func pop() -> Element? {
return array.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element> {
private var array = [Element]()
func push(_ element: Element) {
array.append(element)
}
func pop() -> Element? {
return array.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element> {
private var array = [Element]()
func push(_ element: Element) {
array.append(element)
}
func pop() -> Element? {
return array.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element> {
private var array = [Element]()
func push(_ element: Element) {
array.append(element)
}
func pop() -> Element? {
return array.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element> {
private var array = [Element]()
func pushclass Stack<Element>: StackProtocol { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack<Element>'class Stack<Element> { // invalid redeclaration of 'Stack'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]()
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
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]()
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
private var elements = [Element]()
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
private var elements = [Element]()
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
private var elements = [Element]()
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
private var elements = [Element]()
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
private var elements = [Element]()
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
private var elements = [Element]()
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
private var elements = [Element]()
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
private var elements = [Element]()
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
private var elements = [Element]()
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
private var elements = [Element]()
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
private var elements = [Element]()
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
private var elements = [Element]()
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
private var elements = [Element]()
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
private var elements = [Element]()
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
private var elements = [Element]()
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
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 {
private var elements: [Element] = []
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class Stack<Element> {
private var elements: [Element] = []
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
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] = []
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element> {
private var elements: [Element] = []
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
```init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack<Element>'class Stack<Element> { // invalid redeclaration of 'Stack'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 elements = [Element]()
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class Stack2<Element>: StackProtocol {
var elements = [Element]()
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class Stack3<Element>: StackProtocol {
var elements = [Element]()
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class Stack4<Element>: StackProtocol {
var elements = [Element]()
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class Stack5<Element>: StackProtocol {
var elements = [Element]()
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class Stack6<Element>: StackProtocol {
var elements = [Element]()
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class Stack7<Element>: StackProtocol {
var elements = [Element]()
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class Stack8<Element>: StackProtocol {
var elements = [Element]()
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class Stack9<Element>: StackProtocol {
var elements = [Element]()
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class Stack10<Element>: StackProtocol {
var elements = [Element]()
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class Stack11<Element>: StackProtocol {
var elements = [Element]()
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class Stack12<Element>: StackProtocol {
var elements = [Element]()
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class Stack13<Element>: StackProtocol {
var elements = [Element]()
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class Stack14<Element>: StackProtocol {
var elements = [Element]()
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
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 {
var elements = [Element]()
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack2<Element>: StackProtocol {
var elements = [Element]()
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack3<Element>: StackProtocol {
var elements = [Element]()
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack4<Element>: StackProtocol {
var elements = [Element]()
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack5<Element>: StackProtocol {
var elements = [Element]()
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack6<Element>: StackProtocol {
var elements = [Element]()
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack7<Element>: StackProtocol {
var elements = [Element]()
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack8<Element>: StackProtocol {
var elements = [Element]()
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack9<Element>: StackProtocol {
var elements = [Element]()
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack10<Element>: StackProtocol {
var elements = [Element]()
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack11<Element>: StackProtocol {
var elements = [Element]()
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack12<Element>: StackProtocol {
var elements = [Element]()
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack13<Element>: StackProtocol {
var elements = [Element]()
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack14<Element>: StackProtocol {
var elements = [Element]()
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack15<Element>: StackProtocol {
var elements = [Element]()
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack<Element>'init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack2<Element>'init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack3<Element>'init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack4<Element>'init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack5<Element>'init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack6<Element>'init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack7<Element>'init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack8<Element>'init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack9<Element>'init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack10<Element>'init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack11<Element>'init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack12<Element>'init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack13<Element>'init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack14<Element>'var stack = Stack<Int>() // variable 'stack' was never mutated; consider changing to 'let' constantprotocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
class Stack<T>: StackProtocol {
private var elements = [T]()
func push(_ element: T) {
elements.append(element)
}
func pop() -> T? {
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<T>: StackProtocol {
private var elements = [T]()
func push(_ element: T) {
elements.append(element)
}
func pop() -> T? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<T>: StackProtocol {
private var elements = [T]()
func push(_ element: T) {
elements.append(element)
}
func pop() -> T? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<T>: StackProtocol {
private var elements = [T]()
func push(_ element: T) {
elements.append(element)
}
func pop() -> T? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<T>: StackProtocol {
private var elements = [T]()
func push(_ element: T) {
elements.append(element)
}
func pop() -> T? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<T>: StackProtocol {
private var elements = [T]()
func push(_ element: T) {
elements.append(element)
}
func pop() -> T? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<T>: StackProtocol {
private var elements = [T]()
func push(_ element: T) {
elements.append(element)
}
func pop() -> T? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<T>: StackProtocol {
private var elements = [T]()
func push(_ element: T) {
elements.append(element)
}
func pop() -> T? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<T>: StackProtocol {
private var elements = [T]()
func push(_ element: T) {
elements.append(element)
}
func pop() -> T? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<T>: StackProtocol {
private var elements = [T]()
func push(_ element: T) {
elements.append(element)
}
func pop() -> T? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<T>: StackProtocol {
private var elements = [T]()
func push(_ element: T) {
elements.append(element)
}
func pop() -> T? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<T>: StackProtocol {
private var elements = [T]()
func push(_ element: T) {
elements.append(element)
}
func pop() -> T? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<T>: StackProtocol {
private var elements = [T]()
func push(_ element: T) {
elements.append(element)
}
func pop() -> T? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<T>: StackProtocol {
private var elements = [T]()
func push(_ element: T) {
elements.append(element)
}
func pop() -> T? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<T>: StackProtocol {
private var elements = [T]()
func push(_ element: T) {
elements.append(element)
}
func pop() -> T? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<T>: StackProtocol {
private var elements = [T]()
func push(_ element: T) {
elements.append(element)
}
func pop() -> T? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<T>: StackProtocol {
private var elements = [T]()
func push(_ element: T) {
elements.append(element)
}
func pop() -> T? {
return elements.popLast()
}
class Stack<T>: StackProtocol { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack<T>'var stack = Stack<Int>() // variable 'stack' was never mutated; consider changing to 'let' constantprotocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
class Stack<Element>: StackProtocol {
private var elements = [Element]()
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class Stack2<Element>: StackProtocol {
private var elements = [Element]()
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class Stack3<Element>: StackProtocol {
private var elements = [Element]()
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class Stack4<Element>: StackProtocol {
private var elements = [Element]()
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class Stack5<Element>: StackProtocol {
private var elements = [Element]()
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class Stack6<Element>: StackProtocol {
private var elements = [Element]()
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class Stack7<Element>: StackProtocol {
private var elements = [Element]()
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class Stack8<Element>: StackProtocol {
private var elements = [Element]()
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class Stack9<Element>: StackProtocol {
private var elements = [Element]()
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class Stack10<Element>: StackProtocol {
private var elements = [Element]()
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class Stack11<Element>: StackProtocol {
private var elements = [Element]()
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class Stack12<Element>: StackProtocol {
private var elements = [Element]()
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class Stack13<Element>: StackProtocol {
private var elements = [Element]()
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class Stack14<Element>: StackProtocol {
private var elements = [Element]()
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class Stack15<Element>: StackProtocol {
private var elements = [Element]()
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
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]()
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack2<Element>: StackProtocol {
private var elements = [Element]()
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack3<Element>: StackProtocol {
private var elements = [Element]()
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack4<Element>: StackProtocol {
private var elements = [Element]()
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack5<Element>: StackProtocol {
private var elements = [Element]()
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack6<Element>: StackProtocol {
private var elements = [Element]()
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack7<Element>: StackProtocol {
private var elements = [Element]()
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack8<Element>: StackProtocol {
private var elements = [Element]()
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack9<Element>: StackProtocol {
private var elements = [Element]()
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack10<Element>: StackProtocol {
private var elements = [Element]()
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack11<Element>: StackProtocol {
private var elements = [Element]()
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack12<Element>: StackProtocol {
private var elements = [Element]()
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack13<Element>: StackProtocol {
private var elements = [Element]()
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack14<Element>: StackProtocol {
private var elements = [Element]()
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack15<Element>: StackProtocol {
private var elements = [Element]()
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack16<Element>: StackProtocol {
private var elements = [Element]()
func push(_ element: Element) {
elements.append(class Stack<Element>: StackProtocol { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack<Element>'class Stack2<Element>: StackProtocol { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack2<Element>'class Stack3<Element>: StackProtocol { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack3<Element>'class Stack4<Element>: StackProtocol { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack4<Element>'class Stack5<Element>: StackProtocol { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack5<Element>'class Stack6<Element>: StackProtocol { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack6<Element>'class Stack7<Element>: StackProtocol { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack7<Element>'class Stack8<Element>: StackProtocol { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack8<Element>'class Stack9<Element>: StackProtocol { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack9<Element>'class Stack10<Element>: StackProtocol { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack10<Element>'class Stack11<Element>: StackProtocol { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack11<Element>'class Stack12<Element>: StackProtocol { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack12<Element>'class Stack13<Element>: StackProtocol { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack13<Element>'class Stack14<Element>: StackProtocol { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack14<Element>'class Stack15<Element>: StackProtocol { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack15<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 {
private var array = [Element]()
func push(_ element: Element) {
array.append(element)
}
func pop() -> Element? {
return array.popLast()
}
}
class Stack2<Element>: StackProtocol {
private var array = [Element]()
func push(_ element: Element) {
array.append(element)
}
func pop() -> Element? {
return array.popLast()
}
}
class Stack3<Element>: StackProtocol {
private var array = [Element]()
func push(_ element: Element) {
array.append(element)
}
func pop() -> Element? {
return array.popLast()
}
}
class Stack4<Element>: StackProtocol {
private var array = [Element]()
func push(_ element: Element) {
array.append(element)
}
func pop() -> Element? {
return array.popLast()
}
}
class Stack5<Element>: StackProtocol {
private var array = [Element]()
func push(_ element: Element) {
array.append(element)
}
func pop() -> Element? {
return array.popLast()
}
}
class Stack6<Element>: StackProtocol {
private var array = [Element]()
func push(_ element: Element) {
array.append(element)
}
func pop() -> Element? {
return array.popLast()
}
}
class Stack7<Element>: StackProtocol {
private var array = [Element]()
func push(_ element: Element) {
array.append(element)
}
func pop() -> Element? {
return array.popLast()
}
}
class Stack8<Element>: StackProtocol {
private var array = [Element]()
func push(_ element: Element) {
array.append(element)
}
func pop() -> Element? {
return array.popLast()
}
}
class Stack9<Element>: StackProtocol {
private var array = [Element]()
func push(_ element: Element) {
array.append(element)
}
func pop() -> Element? {
return array.popLast()
}
}
class Stack10<Element>: StackProtocol {
private var array = [Element]()
func push(_ element: Element) {
array.append(element)
}
func pop() -> Element? {
return array.popLast()
}
}
class Stack11<Element>: StackProtocol {
private var array = [Element]()
func push(_ element: Element) {
array.append(element)
}
func pop() -> Element? {
return array.popLast()
}
}
class Stack12<Element>: StackProtocol {
private var array = [Element]()
func push(_ element: Element) {
array.append(element)
}
func pop() -> Element? {
return array.popLast()
}
}
class Stack13<Element>: StackProtocol {
private var array = [Element]()
func push(_ element: Element) {
array.append(element)
}
func pop() -> Element? {
return array.popLast()
}
}
class Stack14<Element>: StackProtocol {
private var array = [Element]()
func push(_ element: Element) {
array.append(element)
}
func pop() -> Element? {
return array.popLast()
}
}
class Stack15<Element>: StackProtocol {
private var array = [Element]()
func push(_ element: Element) {
array.append(element)
}
func pop() -> Element? {
return array.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 array = [Element]()
func push(_ element: Element) {
array.append(element)
}
func pop() -> Element? {
return array.popLast()
}
}
// Generic stack with push and pop functions.
class Stack2<Element>: StackProtocol {
private var array = [Element]()
func push(_ element: Element) {
array.append(element)
}
func pop() -> Element? {
return array.popLast()
}
}
// Generic stack with push and pop functions.
class Stack3<Element>: StackProtocol {
private var array = [Element]()
func push(_ element: Element) {
array.append(element)
}
func pop() -> Element? {
return array.popLast()
}
}
// Generic stack with push and pop functions.
class Stack4<Element>: StackProtocol {
private var array = [Element]()
func push(_ element: Element) {
array.append(element)
}
func pop() -> Element? {
return array.popLast()
}
}
// Generic stack with push and pop functions.
class Stack5<Element>: StackProtocol {
private var array = [Element]()
func push(_ element: Element) {
array.append(element)
}
func pop() -> Element? {
return array.popLast()
}
}
// Generic stack with push and pop functions.
class Stack6<Element>: StackProtocol {
private var array = [Element]()
func push(_ element: Element) {
array.append(element)
}
func pop() -> Element? {
return array.popLast()
}
}
// Generic stack with push and pop functions.
class Stack7<Element>: StackProtocol {
private var array = [Element]()
func push(_ element: Element) {
array.append(element)
}
func pop() -> Element? {
return array.popLast()
}
}
// Generic stack with push and pop functions.
class Stack8<Element>: StackProtocol {
private var array = [Element]()
func push(_ element: Element) {
array.append(element)
}
func pop() -> Element? {
return array.popLast()
}
}
// Generic stack with push and pop functions.
class Stack9<Element>: StackProtocol {
private var array = [Element]()
func push(_ element: Element) {
array.append(element)
}
func pop() -> Element? {
return array.popLast()
}
}
// Generic stack with push and pop functions.
class Stack10<Element>: StackProtocol {
private var array = [Element]()
func push(_ element: Element) {
array.append(element)
}
func pop() -> Element? {
return array.popLast()
}
}
// Generic stack with push and pop functions.
class Stack11<Element>: StackProtocol {
private var array = [Element]()
func push(_ element: Element) {
array.append(element)
}
func pop() -> Element? {
return array.popLast()
}
}
// Generic stack with push and pop functions.
class Stack12<Element>: StackProtocol {
private var array = [Element]()
func push(_ element: Element) {
array.append(element)
}
func pop() -> Element? {
return array.popLast()
}
}
// Generic stack with push and pop functions.
class Stack13<Element>: StackProtocol {
private var array = [Element]()
func push(_ element: Element) {
array.append(element)
}
func pop() -> Element? {
return array.popLast()
}
}
// Generic stack with push and pop functions.
class Stack14<Element>: StackProtocol {
private var array = [Element]()
func push(_ element: Element) {
array.append(element)
}
func pop() -> Element? {
return array.popLast()
}
}
// Generic stack with push and pop functions.
class Stack15<Element>: StackProtocol {
private var array = [Element]()
func push(_ element: Element) {
array.append(element)
}
func pop() -> Element? {
return array.popLast()
}
}
// Generic stack with push and pop functions.
class Stack16<Element>: StackProtocol {
private var array = [Element]()
func push(_ element: Element) {
array.append(class Stack<Element>: StackProtocol { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack<Element>'class Stack2<Element>: StackProtocol { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack2<Element>'class Stack3<Element>: StackProtocol { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack3<Element>'class Stack4<Element>: StackProtocol { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack4<Element>'class Stack5<Element>: StackProtocol { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack5<Element>'class Stack6<Element>: StackProtocol { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack6<Element>'class Stack7<Element>: StackProtocol { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack7<Element>'class Stack8<Element>: StackProtocol { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack8<Element>'class Stack9<Element>: StackProtocol { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack9<Element>'class Stack10<Element>: StackProtocol { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack10<Element>'class Stack11<Element>: StackProtocol { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack11<Element>'class Stack12<Element>: StackProtocol { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack12<Element>'class Stack13<Element>: StackProtocol { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack13<Element>'class Stack14<Element>: StackProtocol { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack14<Element>'class Stack15<Element>: StackProtocol { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack15<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 stack = [Element]()
init() {}
func push(_ element: Element) {
stack.append(element)
}
func pop() -> Element? {
return stack.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 stack = [Element]()
init() {}
func push(_ element: Element) {
stack.append(element)
}
func pop() -> Element? {
return stack.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
var stack = [Element]()
init() {}
func push(_ element: Element) {
stack.append(element)
}
func pop() -> Element? {
return stack.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
var stack = [Element]()
init() {}
func push(_ element: Element) {
stack.append(element)
}
func pop() -> Element? {
return stack.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
var stack = [Element]()
init() {}
func push(_ element: Element) {
stack.append(element)
}
func pop() -> Element? {
return stack.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
var stack = [Element]()
init() {}
func push(_ element: Element) {
stack.append(element)
}
func pop() -> Element? {
return stack.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
var stack = [Element]()
init() {}
func push(_ element: Element) {
stack.append(element)
}
func pop() -> Element? {
return stack.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
var stack = [Element]()
init() {}
func push(_ element: Element) {
stack.append(element)
}
func pop() -> Element? {
return stack.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
var stack = [Element]()
init() {}
func push(_ element: Element) {
stack.append(element)
}
func pop() -> Element? {
return stack.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
var stack = [Element]()
init() {}
func push(_ element: Element) {
stack.append(element)
}
func pop() -> Element? {
return stack.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
var stack = [Element]()
init() {}
func push(_ element: Element) {
stack.append(element)
}
func pop() -> Element? {
return stack.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
var stack = [Element]()
init() {}
func push(_ element: Element) {
stack.append(element)
}
func pop() -> Element? {
return stack.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
var stack = [Element]()
init() {}
func push(_ element: Element) {
stack.append(element)
}
func pop() -> Element? {
return stack.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
var stack = [Element]()
init() {}
func push(_ element: Element) {
stack.append(element)
}
func pop() -> Element? {
return stack.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
var stack = [Element]()
init() {}
func push(_ element: Element) {
stack.append(element)
}
func pop() -> Element? {
return stack.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
var stack = [Element]()
init() {}
func push(_ element: Element) {
stack.append(element)
}
func pop() -> Element? {
return stack.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocolinit() {} // 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 CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
import Foundation
class Cache<Key: Hashable, Value>: CacheProtocol {
private var capacity: Int
private var cache: [Key: Value]
private var queue: [Key]
init(capacity: Int) {
self.capacity = capacity
cache = [:]
queue = []
}
subscript(key: Key) -> Value? {
get {
return cache[key]
}
set {
if let value = newValue {
cache[key] = value
queue.append(key)
} else {
cache[key] = nil
queue = queue.filter { $0!= key }
}
}
}
func removeLeastRecentlyUsed() {
guard let key = queue.first else { return }
cache[key] = nil
queue = queue.filter { $0!= key }
}
}```swift
import Foundation
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 capacity: Int
private var cache: [Key: Value]
private var queue: [Key]
init(capacity: Int) {
self.capacity = capacity
cache = [:]
queue = []
}
subscript(key: Key) -> Value? {
get {
return cache[key]
}
set {
if let value = newValue {
cache[key] = value
queue.append(key)
} else {
cache[key] = nil
queue = queue.filter { $0!= key }
}
}
}
func removeLeastRecentlyUsed() {
guard let key = queue.first else { return }
cache[key] = nil
queue = queue.filter { $0!= key }
}
}
```init(capacity: Int) { // initializer requirement 'init(capacity:)' can only be satisfied by a 'required' initializer in non-final class 'Cache<Key, Value>'queue = queue.filter { $0!= key } // cannot force unwrap value of non-optional type 'Key'queue = queue.filter { $0!= key } // '=' must have consistent whitespace on both sidesqueue = queue.filter { $0!= key } // cannot force unwrap value of non-optional type 'Key'queue = queue.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 }
}
import Foundation
class Cache<Key: Hashable, Value>: CacheProtocol {
private var capacity: Int
private var cache: [Key: Value]
private var queue: [Key]
init(capacity: Int) {
self.capacity = capacity
self.cache = [Key: Value]()
self.queue = [Key]()
}
subscript(key: Key) -> Value? {
get {
return cache[key]
}
set {
if let value = newValue {
cache[key] = value
queue.append(key)
} else {
cache.removeValue(forKey: key)
queue.removeAll(where: { $0 == key })
}
}
}
func removeLeastRecentlyUsed() {
guard queue.count > 0 else { return }
let key = queue.removeFirst()
cache.removeValue(forKey: key)
}
func removeAll() {
cache.removeAll()
queue.removeAll()
}
}```swift
import Foundation
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 capacity: Int
private var cache: [Key: Value]
private var queue: [Key]
init(capacity: Int) {
self.capacity = capacity
self.cache = [Key: Value]()
self.queue = [Key]()
}
subscript(key: Key) -> Value? {
get {
return cache[key]
}
set {
if let value = newValue {
cache[key] = value
queue.append(key)
} else {
cache.removeValue(forKey: key)
queue.removeAll(where: { $0 == key })
}
}
}
func removeLeastRecentlyUsed() {
guard queue.count > 0 else { return }
let key = queue.removeFirst()
cache.removeValue(forKey: key)
}
func removeAll() {
cache.removeAll()
queue.removeAll()
}
}
```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 }
}
import Foundation
class Cache<Key: Hashable, Value>: CacheProtocol {
private var capacity: Int
private var cache: [Key: Value]
private var queue: [Key]
init(capacity: Int) {
self.capacity = capacity
cache = [:]
queue = []
}
subscript(key: Key) -> Value? {
get {
return cache[key]
}
set {
if let value = newValue {
cache[key] = value
queue.append(key)
} else {
cache[key] = nil
queue = queue.filter { $0!= key }
}
}
}
func removeLeastRecentlyUsed() {
if queue.count > 0 {
let key = queue.removeFirst()
cache[key] = nil
}
}
}```swift
import Foundation
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 capacity: Int
private var cache: [Key: Value]
private var queue: [Key]
init(capacity: Int) {
self.capacity = capacity
cache = [:]
queue = []
}
subscript(key: Key) -> Value? {
get {
return cache[key]
}
set {
if let value = newValue {
cache[key] = value
queue.append(key)
} else {
cache[key] = nil
queue = queue.filter { $0!= key }
}
}
}
func removeLeastRecentlyUsed() {
if queue.count > 0 {
let key = queue.removeFirst()
cache[key] = nil
}
}
}
// Test
let cache = Cache<String, Int>(capacity: 5)
cache["key1"] = 1
cache["key2"] = 2
cache["key3"] = 3
cache["key4"] = 4
cache["key5"] = 5
cache["key6"] = 6
cache["key7"] = 7
cache["key8"] = 8
cache["key9"] = 9
cache["key10"] = 10
cache["key11"] = 11
cache["key12"] = 12
cache["key13"] = 13
cache["key14"] = 14
cache["key15"] = 15
cache["key16"] = 16
cache["key17"] = 17
cache["key18"] = 18
cache["key19"] = 19
cache["key20"] = 20
cache["key21"] = 21
cache["key22"] = 22
cache["key23"] = 23
cache["key24"] = 24
cache["key25"] = 25
cache["key26"] = 26
cache["key27"] = 27
cache["key28"] = 28
cache["key29"] = 29
cache["key30"] = 30
cache["key31"] = 31
cache["key32"] = 32
cache["key33"] = 33
cache["key34"] = 34
cache["key35"] = 35
cache["key36"] = 36
cache["key37"] = 37
cache["key38"] = 38
cache["key39"] = 39
cache["key40"] = 40
cache["key41"] = 41
cache["key42"] = 42
cache["key43"] = 43
cache["key44"] = 44
cache["key45"] = 45
cache["key46"] = 46
cache["key47"] = 47
cache["key48"] = 48
cache["key49"] = 49
cache["key50"] = 50
cache["key51"] = 51
cache["key52"] = 52
cache["key53"] = 53
cache["key54"] = 54
cache["key55"] = 55
cache["key56"] = 56
cache["key57"] = 57
cache["key58"] = 58
cache["key59"] = 59
cache["key60"] = 60
cache["key61"] = 61
cache["key62"] = 62
cache["key63"] = 63
cache["key64"] = 64
cache["key65"] = 65
cache["key66"] = 66
cache["key67"] = 67
cache["key68"] = 68
cache["key69"] = 69
cache["key70"] = 70
cache["key71"] = 71
cache["key72"] = 72
cache["key73"] = 73
cache["key74"] = 74
cache["key75"] = 75
cache["key76"] = 76
cache["key77"] = 77
cacheinit(capacity: Int) { // initializer requirement 'init(capacity:)' can only be satisfied by a 'required' initializer in non-final class 'Cache<Key, Value>'queue = queue.filter { $0!= key } // '=' must have consistent whitespace on both sidesqueue = queue.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 }
}
import Foundation
class Cache<Key: Hashable, Value>: CacheProtocol {
private var capacity: Int
private var cache: [Key: Value]
private var queue: [Key]
init(capacity: Int) {
self.capacity = capacity
self.cache = [:]
self.queue = []
}
subscript(key: Key) -> Value? {
get {
return cache[key]
}
set {
if let value = newValue {
cache[key] = value
queue.append(key)
} else {
cache.removeValue(forKey: key)
queue = queue.filter { $0!= key }
}
}
}
func removeLeastRecentlyUsed() {
guard queue.count > 0 else { return }
let key = queue.removeFirst()
cache.removeValue(forKey: key)
}
}```swift
import Foundation
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 capacity: Int
private var cache: [Key: Value]
private var queue: [Key]
init(capacity: Int) {
self.capacity = capacity
self.cache = [:]
self.queue = []
}
subscript(key: Key) -> Value? {
get {
return cache[key]
}
set {
if let value = newValue {
cache[key] = value
queue.append(key)
} else {
cache.removeValue(forKey: key)
queue = queue.filter { $0!= key }
}
}
}
func removeLeastRecentlyUsed() {
guard queue.count > 0 else { return }
let key = queue.removeFirst()
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, Value>'queue = queue.filter { $0!= key } // '=' must have consistent whitespace on both sidesqueue = queue.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 }
}
import Foundation
class Cache<Key: Hashable, Value>: CacheProtocol {
private var capacity: Int
private var storage: [Key: Value]
private var queue: [Key]
init(capacity: Int) {
self.capacity = capacity
self.storage = [:]
self.queue = []
}
subscript(key: Key) -> Value? {
get {
return storage[key]
}
set {
if let value = newValue {
queue.append(key)
storage[key] = value
} else {
storage[key] = nil
}
}
}
func removeLeastRecentlyUsed() {
guard let key = queue.first else { return }
queue.removeFirst()
storage[key] = nil
}
}```swift
import Foundation
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 capacity: Int
private var storage: [Key: Value]
private var queue: [Key]
init(capacity: Int) {
self.capacity = capacity
self.storage = [:]
self.queue = []
}
subscript(key: Key) -> Value? {
get {
return storage[key]
}
set {
if let value = newValue {
queue.append(key)
storage[key] = value
} else {
storage[key] = nil
}
}
}
func removeLeastRecentlyUsed() {
guard let key = queue.first else { return }
queue.removeFirst()
storage[key] = nil
}
}
```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 }
}
import Foundation
class Cache<Key: Hashable, Value>: CacheProtocol {
private var capacity: Int
private var items: [Key: Value]
private var queue: [Key]
init(capacity: Int) {
self.capacity = capacity
self.items = [:]
self.queue = []
}
subscript(key: Key) -> Value? {
get {
return items[key]
}
set {
if let newValue = newValue {
queue.append(key)
items[key] = newValue
} else {
queue.removeAll(where: { $0 == key })
items[key] = nil
}
}
}
func removeLeastRecentlyUsed() {
guard let key = queue.first else { return }
queue.removeFirst()
items[key] = nil
}
}```swift
import Foundation
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 capacity: Int
private var items: [Key: Value]
private var queue: [Key]
init(capacity: Int) {
self.capacity = capacity
self.items = [:]
self.queue = []
}
subscript(key: Key) -> Value? {
get {
return items[key]
}
set {
if let newValue = newValue {
queue.append(key)
items[key] = newValue
} else {
queue.removeAll(where: { $0 == key })
items[key] = nil
}
}
}
func removeLeastRecentlyUsed() {
guard let key = queue.first else { return }
queue.removeFirst()
items[key] = nil
}
}
```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 }
}
import Foundation
class Cache<Key: Hashable, Value>: CacheProtocol {
private var capacity: Int
private var cache: [Key: Value]
private var queue: [Key]
init(capacity: Int) {
self.capacity = capacity
self.cache = [:]
self.queue = []
}
subscript(key: Key) -> Value? {
get {
return cache[key]
}
set {
if let value = newValue {
queue.append(key)
cache[key] = value
} else {
cache[key] = nil
queue.removeAll(where: { $0 == key })
}
}
}
func removeLeastRecentlyUsed() {
guard queue.count > 0 else { return }
let key = queue.removeFirst()
cache[key] = nil
}
func removeAll() {
cache.removeAll()
queue.removeAll()
}
}```swift
import Foundation
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 capacity: Int
private var cache: [Key: Value]
private var queue: [Key]
init(capacity: Int) {
self.capacity = capacity
self.cache = [:]
self.queue = []
}
subscript(key: Key) -> Value? {
get {
return cache[key]
}
set {
if let value = newValue {
queue.append(key)
cache[key] = value
} else {
cache[key] = nil
queue.removeAll(where: { $0 == key })
}
}
}
func removeLeastRecentlyUsed() {
guard queue.count > 0 else { return }
let key = queue.removeFirst()
cache[key] = nil
}
func removeAll() {
cache.removeAll()
queue.removeAll()
}
}
```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 }
}
import Foundation
class Cache<Key: Hashable, Value>: CacheProtocol {
private var capacity: Int
private var cache: [Key: Value]
private var queue: [Key]
init(capacity: Int) {
self.capacity = capacity
cache = [:]
queue = []
}
subscript(key: Key) -> Value? {
get {
return cache[key]
}
set {
if let value = newValue {
cache[key] = value
queue.append(key)
} else {
cache.removeValue(forKey: key)
queue = queue.filter { $0!= key }
}
}
}
func removeLeastRecentlyUsed() {
guard queue.count > 0 else { return }
let key = queue.removeFirst()
cache.removeValue(forKey: key)
}
}```swift
import Foundation
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 capacity: Int
private var cache: [Key: Value]
private var queue: [Key]
init(capacity: Int) {
self.capacity = capacity
cache = [:]
queue = []
}
subscript(key: Key) -> Value? {
get {
return cache[key]
}
set {
if let value = newValue {
cache[key] = value
queue.append(key)
} else {
cache.removeValue(forKey: key)
queue = queue.filter { $0!= key }
}
}
}
func removeLeastRecentlyUsed() {
guard queue.count > 0 else { return }
let key = queue.removeFirst()
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, Value>'queue = queue.filter { $0!= key } // '=' must have consistent whitespace on both sidesqueue = queue.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 }
}
import Foundation
class Cache<Key: Hashable, Value>: CacheProtocol {
private var capacity: Int
private var cache: [Key: Value]
private var queue: [Key]
init(capacity: Int) {
self.capacity = capacity
self.cache = [:]
self.queue = []
}
subscript(key: Key) -> Value? {
get {
return cache[key]
}
set {
if let value = newValue {
cache[key] = value
queue.append(key)
} else {
cache.removeValue(forKey: key)
queue.removeAll(where: { $0 == key })
}
}
}
func removeLeastRecentlyUsed() {
guard queue.count > 0 else { return }
let key = queue.removeFirst()
cache.removeValue(forKey: key)
}
}```swift
import Foundation
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 capacity: Int
private var cache: [Key: Value]
private var queue: [Key]
init(capacity: Int) {
self.capacity = capacity
self.cache = [:]
self.queue = []
}
subscript(key: Key) -> Value? {
get {
return cache[key]
}
set {
if let value = newValue {
cache[key] = value
queue.append(key)
} else {
cache.removeValue(forKey: key)
queue.removeAll(where: { $0 == key })
}
}
}
func removeLeastRecentlyUsed() {
guard queue.count > 0 else { return }
let key = queue.removeFirst()
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, Value>'protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
import Foundation
class Cache<Key: Hashable, Value>: CacheProtocol {
private var capacity: Int
private var cache = [Key: Value]()
private var keys = [Key]()
private var keyToIndex = [Key: Int]()
private var head: Int?
private var tail: Int?
required init(capacity: Int) {
self.capacity = capacity
}
subscript(key: Key) -> Value? {
get {
return cache[key]
}
set {
if let index = keyToIndex[key] {
keys.remove(at: index)
keys.append(key)
cache[key] = newValue
} else {
if keys.count == capacity {
let key = keys.removeFirst()
cache[key] = nil
keyToIndex[key] = nil
}
keys.append(key)
keyToIndex[key] = keys.count - 1
cache[key] = newValue
}
}
}
}```swift
import Foundation
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 capacity: Int
private var cache = [Key: Value]()
private var keys = [Key]()
private var keyToIndex = [Key: Int]()
private var head: Int?
private var tail: Int?
required init(capacity: Int) {
self.capacity = capacity
}
subscript(key: Key) -> Value? {
get {
return cache[key]
}
set {
if let index = keyToIndex[key] {
keys.remove(at: index)
keys.append(key)
cache[key] = newValue
} else {
if keys.count == capacity {
let key = keys.removeFirst()
cache[key] = nil
keyToIndex[key] = nil
}
keys.append(key)
keyToIndex[key] = keys.count - 1
cache[key] = newValue
}
}
}
}
```protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
import Foundation
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache: [Key: (Value, TimeInterval)] = [:]
private let expirationPolicy: ExpirationPolicy
init(expirationPolicy: ExpirationPolicy) {
self.expirationPolicy = expirationPolicy
}
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = (value, expiration + Date().timeIntervalSince1970)
}
func get(key: Key) -> Value? {
guard let (value, expiration) = cache[key] else { return nil }
guard expiration > Date().timeIntervalSince1970 else { return nil }
return value
}
subscript(key: Key) -> Value? {
get { return get(key: key) }
set { put(value: newValue, key: key, expiration: expirationPolicy.expiration) }
}
}
protocol ExpirationPolicy {
var expiration: TimeInterval { get }
}
struct FixedExpirationPolicy: ExpirationPolicy {
let expiration: TimeInterval
init(expiration: TimeInterval) {
self.expiration = expiration
}
}
struct RandomExpirationPolicy: ExpirationPolicy {
let expiration: TimeInterval
init(expiration: TimeInterval) {
self.expiration = expiration
}
}
struct RandomFixedExpirationPolicy: ExpirationPolicy {
let expiration: TimeInterval
init(expiration: TimeInterval) {
self.expiration = expiration
}
}```swift
import Foundation
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, TimeInterval)] = [:]
private let expirationPolicy: ExpirationPolicy
init(expirationPolicy: ExpirationPolicy) {
self.expirationPolicy = expirationPolicy
}
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = (value, expiration + Date().timeIntervalSince1970)
}
func get(key: Key) -> Value? {
guard let (value, expiration) = cache[key] else { return nil }
guard expiration > Date().timeIntervalSince1970 else { return nil }
return value
}
subscript(key: Key) -> Value? {
get { return get(key: key) }
set { put(value: newValue, key: key, expiration: expirationPolicy.expiration) }
}
}
// Expiration policy for cache.
protocol ExpirationPolicy {
var expiration: TimeInterval { get }
}
// Expiration policy for cache with fixed expiration.
struct FixedExpirationPolicy: ExpirationPolicy {
let expiration: TimeInterval
init(expiration: TimeInterval) {
self.expiration = expiration
}
}
// Expiration policy for cache with random expiration.
struct RandomExpirationPolicy: ExpirationPolicy {
let expiration: TimeInterval
init(expiration: TimeInterval) {
self.expiration = expiration
}
}
// Expiration policy for cache with fixed expiration and random expiration.
struct RandomFixedExpirationPolicy: ExpirationPolicy {
let expiration: TimeInterval
init(expiration: TimeInterval) {
self.expiration = expiration
}
}
```set { put(value: newValue, key: key, expiration: expirationPolicy.expiration) } // value of optional type 'Value?' must be unwrapped to a value of type 'Value'let cache = ExpirableCache<String, String>() // missing argument for parameter 'expirationPolicy' 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?
}
import Foundation
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache = [Key: (Value, TimeInterval)]()
private var expirationPolicy: ExpirationPolicyProtocol
init(expirationPolicy: ExpirationPolicyProtocol) {
self.expirationPolicy = expirationPolicy
}
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = (value, expirationPolicy.expirationDate(expiration))
}
func get(key: Key) -> Value? {
if let (value, expiration) = cache[key] {
if expirationPolicy.isExpired(expiration) {
cache.removeValueForKey(key)
return nil
}
return value
}
return nil
}
subscript(key: Key) -> Value? {
get {
return get(key)
}
set {
if let value = newValue {
put(value, key: key, expiration: 0)
} else {
cache.removeValueForKey(key)
}
}
}
}
protocol ExpirationPolicyProtocol {
func expirationDate(expiration: TimeInterval) -> TimeInterval
func isExpired(expiration: TimeInterval) -> Bool
}
class AbsoluteExpirationPolicy: ExpirationPolicyProtocol {
func expirationDate(expiration: TimeInterval) -> TimeInterval {
return expiration
}
func isExpired(expiration: TimeInterval) -> Bool {
return expiration < NSDate().timeIntervalSince1970
}
}
class RelativeExpirationPolicy: ExpirationPolicyProtocol {
func expirationDate(expiration: TimeInterval) -> TimeInterval {
return NSDate().timeIntervalSince1970 + expiration
}
func isExpired(expiration: TimeInterval) -> Bool {
return expiration < NSDate().timeIntervalSince1970
}
}```swift
import Foundation
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, TimeInterval)]()
private var expirationPolicy: ExpirationPolicyProtocol
init(expirationPolicy: ExpirationPolicyProtocol) {
self.expirationPolicy = expirationPolicy
}
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = (value, expirationPolicy.expirationDate(expiration))
}
func get(key: Key) -> Value? {
if let (value, expiration) = cache[key] {
if expirationPolicy.isExpired(expiration) {
cache.removeValueForKey(key)
return nil
}
return value
}
return nil
}
subscript(key: Key) -> Value? {
get {
return get(key)
}
set {
if let value = newValue {
put(value, key: key, expiration: 0)
} else {
cache.removeValueForKey(key)
}
}
}
}
// Expiration policy protocol.
protocol ExpirationPolicyProtocol {
func expirationDate(expiration: TimeInterval) -> TimeInterval
func isExpired(expiration: TimeInterval) -> Bool
}
// Expiration policy that uses absolute expiration.
class AbsoluteExpirationPolicy: ExpirationPolicyProtocol {
func expirationDate(expiration: TimeInterval) -> TimeInterval {
return expiration
}
func isExpired(expiration: TimeInterval) -> Bool {
return expiration < NSDate().timeIntervalSince1970
}
}
// Expiration policy that uses relative expiration.
class RelativeExpirationPolicy: ExpirationPolicyProtocol {
func expirationDate(expiration: TimeInterval) -> TimeInterval {
return NSDate().timeIntervalSince1970 + expiration
}
func isExpired(expiration: TimeInterval) -> Bool {
return expiration < NSDate().timeIntervalSince1970
}
}
```cache[key] = (value, expirationPolicy.expirationDate(expiration)) // missing argument label 'expiration:' in callif expirationPolicy.isExpired(expiration) { // missing argument label 'expiration:' in callcache.removeValueForKey(key) // value of type '[Key : (Value, TimeInterval)]' (aka 'Dictionary<Key, (Value, Double)>') has no member 'removeValueForKey'return get(key) // missing argument label 'key:' in callput(value, key: key, expiration: 0) // missing argument label 'value:' in callcache.removeValueForKey(key) // value of type '[Key : (Value, TimeInterval)]' (aka 'Dictionary<Key, (Value, Double)>') has no member 'removeValueForKey'let cache = ExpirableCache<String, String>() // missing argument for parameter 'expirationPolicy' 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?
}
import Foundation
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache: [Key: (Value, TimeInterval)] = [:]
private let expiration: TimeInterval
private let queue = DispatchQueue(label: "com.expirablecache.queue")
init(expiration: TimeInterval) {
self.expiration = expiration
}
func put(value: Value, key: Key, expiration: TimeInterval) {
queue.async {
self.cache[key] = (value, expiration)
}
}
func get(key: Key) -> Value? {
queue.sync {
guard let (value, expiration) = cache[key] else { return nil }
guard expiration > Date().timeIntervalSince1970 else { return nil }
return value
}
}
subscript(key: Key) -> Value? {
get { return get(key: key) }
set { put(value: newValue, key: key, expiration: expiration) }
}
}```swift
import Foundation
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, TimeInterval)] = [:]
private let expiration: TimeInterval
private let queue = DispatchQueue(label: "com.expirablecache.queue")
init(expiration: TimeInterval) {
self.expiration = expiration
}
func put(value: Value, key: Key, expiration: TimeInterval) {
queue.async {
self.cache[key] = (value, expiration)
}
}
func get(key: Key) -> Value? {
queue.sync {
guard let (value, expiration) = cache[key] else { return nil }
guard expiration > Date().timeIntervalSince1970 else { return nil }
return value
}
}
subscript(key: Key) -> Value? {
get { return get(key: key) }
set { put(value: newValue, key: key, expiration: expiration) }
}
}
```set { put(value: newValue, key: key, expiration: expiration) } // value of optional type 'Value?' must be unwrapped to a value of type 'Value'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?
}
import Foundation
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache: [Key: (Value, TimeInterval)] = [:]
private let expiration: TimeInterval
private let queue = DispatchQueue(label: "com.expirablecache.queue")
init(expiration: TimeInterval) {
self.expiration = expiration
}
func put(value: Value, key: Key, expiration: TimeInterval) {
queue.async {
self.cache[key] = (value, expiration)
}
}
func get(key: Key) -> Value? {
queue.sync {
guard let (value, expiration) = cache[key] else {
return nil
}
if expiration > 0 && expiration < Date().timeIntervalSince1970 {
return nil
}
return value
}
}
}```swift
import Foundation
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, TimeInterval)] = [:]
private let expiration: TimeInterval
private let queue = DispatchQueue(label: "com.expirablecache.queue")
init(expiration: TimeInterval) {
self.expiration = expiration
}
func put(value: Value, key: Key, expiration: TimeInterval) {
queue.async {
self.cache[key] = (value, expiration)
}
}
func get(key: Key) -> Value? {
queue.sync {
guard let (value, expiration) = cache[key] else {
return nil
}
if expiration > 0 && expiration < Date().timeIntervalSince1970 {
return nil
}
return value
}
}
}
```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?
}
import Foundation
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache = [Key: (Value, TimeInterval)]()
private var expirationPolicy: ExpirationPolicyProtocol
init(expirationPolicy: ExpirationPolicyProtocol) {
self.expirationPolicy = expirationPolicy
}
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = (value, expiration + Date().timeIntervalSince1970)
}
func get(key: Key) -> Value? {
if let (value, expiration) = cache[key] {
if expiration > Date().timeIntervalSince1970 {
return value
} else {
cache.removeValue(forKey: key)
return nil
}
}
return nil
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
put(value: newValue, key: key, expiration: expirationPolicy.expiration)
}
}
}
class ExpirationPolicy {
let expiration: TimeInterval
init(expiration: TimeInterval) {
self.expiration = expiration
}
}
class LFUExpirationPolicy: ExpirationPolicy {
override init(expiration: TimeInterval) {
super.init(expiration: expiration)
}
}
class LRUExpirationPolicy: ExpirationPolicy {
override init(expiration: TimeInterval) {
super.init(expiration: expiration)
}
}
class MRUExpirationPolicy: ExpirationPolicy {
override init(expiration: TimeInterval) {
super.init(expiration: expiration)
}
}
class FIFOExpirationPolicy: ExpirationPolicy {
override init(expiration: TimeInterval) {
super.init(expiration: expiration)
}
}```swift
import Foundation
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, TimeInterval)]()
private var expirationPolicy: ExpirationPolicyProtocol
init(expirationPolicy: ExpirationPolicyProtocol) {
self.expirationPolicy = expirationPolicy
}
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = (value, expiration + Date().timeIntervalSince1970)
}
func get(key: Key) -> Value? {
if let (value, expiration) = cache[key] {
if expiration > Date().timeIntervalSince1970 {
return value
} else {
cache.removeValue(forKey: key)
return nil
}
}
return nil
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
put(value: newValue, key: key, expiration: expirationPolicy.expiration)
}
}
}
// Expiration policy that removes elements from cache after expiration.
class ExpirationPolicy {
let expiration: TimeInterval
init(expiration: TimeInterval) {
self.expiration = expiration
}
}
// Expiration policy that removes elements from cache after expiration.
class LFUExpirationPolicy: ExpirationPolicy {
override init(expiration: TimeInterval) {
super.init(expiration: expiration)
}
}
// Expiration policy that removes elements from cache after expiration.
class LRUExpirationPolicy: ExpirationPolicy {
override init(expiration: TimeInterval) {
super.init(expiration: expiration)
}
}
// Expiration policy that removes elements from cache after expiration.
class MRUExpirationPolicy: ExpirationPolicy {
override init(expiration: TimeInterval) {
super.init(expiration: expiration)
}
}
// Expiration policy that removes elements from cache after expiration.
class FIFOExpirationPolicy: ExpirationPolicy {
override init(expiration: TimeInterval) {
super.init(expiration: expiration)
}
}
// Expiration policy that removes elements from cache after expiration.
class LFUExpirationPolicy: ExpirationPolicy {
override init(expiration: TimeInterval) {
super.init(expiration: expiration)
}
}
// Expiration policy that removes elements from cache after expiration.
class LRUExpirationPolicy: ExpirationPolicy {
override init(expiration: TimeInterval) {
super.init(expiration: expiration)
}
}
// Expiration policy that removes elements from cache after expiration.
class MRUExpirationPolicy: ExpirationPolicy {
override init(expiration: TimeInterval) {
super.init(expiration: expiration)
}
}
// Expiration policy that removes elements from cache after expiration.
class FIFOExpirationPolicy: ExpirationPolicy {
override init(expiration: TimeInterval) {
super.init(expiration: expiration)
}
}
// Expiration policy that removes elements from cache after expiration.
class LFUExpirationPolicy: ExpirationPolicy {
override init(expiration: TimeInterval) {
super.init(expiration: expiration)
}
}
// Expiration policy that removes elements from cache after expiration.
class LRUExpirationPolicy: ExpirationPolicy {
override init(expiration: TimeInterval) {
super.init(expiration: expiration)
}
}
// Expiration policy that removes elements from cache after expiration.
class MRUExpirationPolicy: ExpirationPolicy {
override init(expiration: TimeInterval) {
super.init(expiration: expiration)
}
}
// Expiration policy that removes elements from cache after expiration.
class FIFOExpirationPolicy: ExpirationPolicy {
override init(expiration: TimeInterval) {
super.init(expiration: expiration)
}
}
// Expiration policy that removes elements from cache after expiration.
class LFUExpirationPolicy: ExpirationPolicy {
override init(expiration: TimeInterval) {
super.init(expiration: expiration)
}
}
// Expiration policy that removes elements from cache after expiration.
class LRUExpirationPolicy: ExpirationPolicy {
override init(expiration: TimeInterval) {
super.init(expiration: expiration)
}
}
// Expiration policy that removes elements from cache after expiration.
class MRUExpirationPolicy: ExpirationPolicy {
override init(expiration: TimeInterval) {
super.init(expiration: expiration)
}
}
// Expiration policy that removes elements from cache after expiration.
class FIFOExpirationPolicy: ExpirationPolicy {
override init(expiration: TimeInterval) {
super.init(expirationprivate var expirationPolicy: ExpirationPolicyProtocol // cannot find type 'ExpirationPolicyProtocol' in scopeinit(expirationPolicy: ExpirationPolicyProtocol) { // cannot find type 'ExpirationPolicyProtocol' in scopeput(value: newValue, key: key, expiration: expirationPolicy.expiration) // 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?
}
import Foundation
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache: [Key: (Value, TimeInterval)] = [:]
private var expiration: TimeInterval
private let queue = DispatchQueue(label: "com.expirablecache.queue")
init(expiration: TimeInterval) {
self.expiration = expiration
}
func put(value: Value, key: Key, expiration: TimeInterval) {
queue.async {
self.cache[key] = (value, expiration)
}
}
func get(key: Key) -> Value? {
queue.sync {
guard let (value, expiration) = cache[key] else { return nil }
guard expiration > 0 else { return value }
guard expiration > Date().timeIntervalSince1970 else {
cache.removeValue(forKey: key)
return nil
}
return value
}
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
guard let newValue = newValue else { return }
put(value: newValue, key: key, expiration: expiration)
}
}
}```swift
import Foundation
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, TimeInterval)] = [:]
private var expiration: TimeInterval
private let queue = DispatchQueue(label: "com.expirablecache.queue")
init(expiration: TimeInterval) {
self.expiration = expiration
}
func put(value: Value, key: Key, expiration: TimeInterval) {
queue.async {
self.cache[key] = (value, expiration)
}
}
func get(key: Key) -> Value? {
queue.sync {
guard let (value, expiration) = cache[key] else { return nil }
guard expiration > 0 else { return value }
guard expiration > Date().timeIntervalSince1970 else {
cache.removeValue(forKey: key)
return nil
}
return value
}
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
guard let newValue = newValue else { return }
put(value: newValue, key: key, expiration: expiration)
}
}
}
```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?
}
import Foundation
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache = [Key: (Value, TimeInterval)]()
private var expiration: TimeInterval
init(expiration: TimeInterval) {
self.expiration = expiration
}
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = (value, expiration)
}
func get(key: Key) -> Value? {
guard let (value, expiration) = cache[key] else {
return nil
}
guard expiration > Date().timeIntervalSince1970 else {
return nil
}
return value
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
guard let value = newValue else {
cache[key] = nil
return
}
put(value: value, key: key, expiration: expiration)
}
}
}```swift
import Foundation
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, TimeInterval)]()
private var expiration: TimeInterval
init(expiration: TimeInterval) {
self.expiration = expiration
}
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = (value, expiration)
}
func get(key: Key) -> Value? {
guard let (value, expiration) = cache[key] else {
return nil
}
guard expiration > Date().timeIntervalSince1970 else {
return nil
}
return value
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
guard let value = newValue else {
cache[key] = nil
return
}
put(value: value, key: key, expiration: expiration)
}
}
}
```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?
}
import Foundation
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache = [Key: (Value, TimeInterval)]()
private let expirationPolicy: ExpirationPolicy
init(expirationPolicy: ExpirationPolicy =.eviction) {
self.expirationPolicy = expirationPolicy
}
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = (value, expiration)
}
func get(key: Key) -> Value? {
guard let (value, expiration) = cache[key] else { return nil }
guard expiration > 0 else { return value }
guard expiration > Date().timeIntervalSince1970 else {
cache.removeValue(forKey: key)
return nil
}
return value
}
subscript(key: Key) -> Value? {
get { return get(key: key) }
set { put(value: newValue, key: key, expiration: 0) }
}
}
enum ExpirationPolicy {
case eviction
case lru
case mru
}```swift
import Foundation
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, TimeInterval)]()
private let expirationPolicy: ExpirationPolicy
init(expirationPolicy: ExpirationPolicy =.eviction) {
self.expirationPolicy = expirationPolicy
}
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = (value, expiration)
}
func get(key: Key) -> Value? {
guard let (value, expiration) = cache[key] else { return nil }
guard expiration > 0 else { return value }
guard expiration > Date().timeIntervalSince1970 else {
cache.removeValue(forKey: key)
return nil
}
return value
}
subscript(key: Key) -> Value? {
get { return get(key: key) }
set { put(value: newValue, key: key, expiration: 0) }
}
}
// Expiration policy.
enum ExpirationPolicy {
case eviction
case lru
case mru
}
```init(expirationPolicy: ExpirationPolicy =.eviction) { // '=' must have consistent whitespace on both sidesset { 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?
}
import Foundation
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache = [Key: (Value, TimeInterval)]()
private var expirationQueue = PriorityQueue<Key>()
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = (value, expiration)
expirationQueue.insert(key, priority: expiration)
}
func get(key: Key) -> Value? {
guard let (value, expiration) = cache[key] else { return nil }
guard expiration > 0 else { return value }
guard expiration > TimeInterval(Date().timeIntervalSince1970) else {
cache.removeValue(forKey: key)
return nil
}
return value
}
subscript(key: Key) -> Value? {
get { return get(key: key) }
set { put(value: newValue, key: key, expiration: 0) }
}
}```swift
import Foundation
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, TimeInterval)]()
private var expirationQueue = PriorityQueue<Key>()
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = (value, expiration)
expirationQueue.insert(key, priority: expiration)
}
func get(key: Key) -> Value? {
guard let (value, expiration) = cache[key] else { return nil }
guard expiration > 0 else { return value }
guard expiration > TimeInterval(Date().timeIntervalSince1970) else {
cache.removeValue(forKey: key)
return nil
}
return value
}
subscript(key: Key) -> Value? {
get { return get(key: key) }
set { put(value: newValue, key: key, expiration: 0) }
}
}
```private var expirationQueue = PriorityQueue<Key>() // cannot find 'PriorityQueue' in scopeset { 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?
}
import Foundation
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache = [Key: (Value, TimeInterval)]()
private var expiration: TimeInterval
init(expiration: TimeInterval) {
self.expiration = expiration
}
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = (value, expiration)
}
func get(key: Key) -> Value? {
guard let (value, expiration) = cache[key] else {
return nil
}
if expiration > 0 && expiration < Date().timeIntervalSince1970 {
return nil
}
return value
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
put(value: newValue, key: key, expiration: expiration)
}
}
}```swift
import Foundation
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, TimeInterval)]()
private var expiration: TimeInterval
init(expiration: TimeInterval) {
self.expiration = expiration
}
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = (value, expiration)
}
func get(key: Key) -> Value? {
guard let (value, expiration) = cache[key] else {
return nil
}
if expiration > 0 && expiration < Date().timeIntervalSince1970 {
return nil
}
return value
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
put(value: newValue, key: key, expiration: expiration)
}
}
}
```put(value: newValue, key: key, expiration: expiration) // value of optional type 'Value?' must be unwrapped to a value of type 'Value'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 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 {
return string.data(using:.utf8)!.xor(key.data(using:.utf8)!)
}
func decrypt(_ data: Data, _ key: String) -> String {
return data.xor(key.data(using:.utf8)!).base64EncodedString()
}
}```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 {
return string.data(using:.utf8)!.xor(key.data(using:.utf8)!)
}
func decrypt(_ data: Data, _ key: String) -> String {
return data.xor(key.data(using:.utf8)!).base64EncodedString()
}
}
```return string.data(using:.utf8)!.xor(key.data(using:.utf8)!) // value of type 'Data' has no member 'xor'return data.xor(key.data(using:.utf8)!).base64EncodedString() // value of type 'Data' has no member 'xor'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)!
return data.xor(keyData)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using:.utf8)!
return data.xor(keyData).toString()
}
}```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)!
return data.xor(keyData)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using:.utf8)!
return data.xor(keyData).toString()
}
}
```return data.xor(keyData) // value of type 'Data' has no member 'xor'return data.xor(keyData).toString() // value of type 'Data' has no member 'xor'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 {
return string.data(using:.utf8)! ^ key.data(using:.utf8)!
}
func decrypt(_ data: Data, _ key: String) -> String {
return String(data: data ^ key.data(using:.utf8)!, 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 {
return string.data(using:.utf8)! ^ key.data(using:.utf8)!
}
func decrypt(_ data: Data, _ key: String) -> String {
return String(data: data ^ key.data(using:.utf8)!, encoding:.utf8)!
}
}
```return string.data(using:.utf8)! ^ key.data(using:.utf8)! // referencing operator function '^' on 'BinaryInteger' requires that 'Data' conform to 'BinaryInteger'return String(data: data ^ key.data(using:.utf8)!, encoding:.utf8)! // referencing operator function '^' on 'BinaryInteger' requires that 'Data' conform to 'BinaryInteger'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 {
return string.data(using:.utf8)!.xor(key.data(using:.utf8)!)
}
func decrypt(_ data: Data, _ key: String) -> String {
return data.xor(key.data(using:.utf8)!).toString()
}
}```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 {
return string.data(using:.utf8)!.xor(key.data(using:.utf8)!)
}
func decrypt(_ data: Data, _ key: String) -> String {
return data.xor(key.data(using:.utf8)!).toString()
}
}
```return string.data(using:.utf8)!.xor(key.data(using:.utf8)!) // value of type 'Data' has no member 'xor'return data.xor(key.data(using:.utf8)!).toString() // value of type 'Data' has no member 'xor'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 {
return string.data(using:.utf8)! ^ key.data(using:.utf8)!
}
func decrypt(_ data: Data, _ key: String) -> String {
return String(data: data ^ key.data(using:.utf8)!, 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 {
return string.data(using:.utf8)! ^ key.data(using:.utf8)!
}
func decrypt(_ data: Data, _ key: String) -> String {
return String(data: data ^ key.data(using:.utf8)!, encoding:.utf8)!
}
}
```return string.data(using:.utf8)! ^ key.data(using:.utf8)! // referencing operator function '^' on 'BinaryInteger' requires that 'Data' conform to 'BinaryInteger'return String(data: data ^ key.data(using:.utf8)!, encoding:.utf8)! // referencing operator function '^' on 'BinaryInteger' requires that 'Data' conform to 'BinaryInteger'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 {
return string.data(using:.utf8)!
.xor(key.data(using:.utf8)!)
}
func decrypt(_ data: Data, _ key: String) -> String {
return data.xor(key.data(using:.utf8)!)
.base64EncodedString()
}
}```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 {
return string.data(using:.utf8)!
.xor(key.data(using:.utf8)!)
}
func decrypt(_ data: Data, _ key: String) -> String {
return data.xor(key.data(using:.utf8)!)
.base64EncodedString()
}
}
```.xor(key.data(using:.utf8)!) // value of type 'Data' has no member 'xor'return data.xor(key.data(using:.utf8)!) // value of type 'Data' has no member 'xor'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 {
return string.data(using:.utf8)! ^ key.data(using:.utf8)!
}
func decrypt(_ data: Data, _ key: String) -> String {
return String(data: data ^ key.data(using:.utf8)!, 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 {
return string.data(using:.utf8)! ^ key.data(using:.utf8)!
}
func decrypt(_ data: Data, _ key: String) -> String {
return String(data: data ^ key.data(using:.utf8)!, encoding:.utf8)!
}
}
```return string.data(using:.utf8)! ^ key.data(using:.utf8)! // referencing operator function '^' on 'BinaryInteger' requires that 'Data' conform to 'BinaryInteger'return String(data: data ^ key.data(using:.utf8)!, encoding:.utf8)! // referencing operator function '^' on 'BinaryInteger' requires that 'Data' conform to 'BinaryInteger'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)!
var encryptedData = Data(count: stringData.count)
var index = 0
for byte in stringData {
encryptedData[index] = byte ^ keyData[index % keyData.count]
index += 1
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using:.utf8)!
var decryptedData = Data(count: data.count)
var index = 0
for byte in data {
decryptedData[index] = byte ^ keyData[index % keyData.count]
index += 1
}
return String(data: decryptedData, encoding:.utf8)!
}
}```swift
protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
// Simple XOR encryptor and decryptor that converts plain text into encrypted text by applying the binary 'Exclusive OR' operator implemented according to the protocol.
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let keyData = key.data(using:.utf8)!
let stringData = string.data(using:.utf8)!
var encryptedData = Data(count: stringData.count)
var index = 0
for byte in stringData {
encryptedData[index] = byte ^ keyData[index % keyData.count]
index += 1
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using:.utf8)!
var decryptedData = Data(count: data.count)
var index = 0
for byte in data {
decryptedData[index] = byte ^ keyData[index % keyData.count]
index += 1
}
return String(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 {
return string.data(using:.utf8)! ^ key.data(using:.utf8)!
}
func decrypt(_ data: Data, _ key: String) -> String {
return String(data: data ^ key.data(using:.utf8)!, 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 {
return string.data(using:.utf8)! ^ key.data(using:.utf8)!
}
func decrypt(_ data: Data, _ key: String) -> String {
return String(data: data ^ key.data(using:.utf8)!, encoding:.utf8)!
}
}
```return string.data(using:.utf8)! ^ key.data(using:.utf8)! // referencing operator function '^' on 'BinaryInteger' requires that 'Data' conform to 'BinaryInteger'return String(data: data ^ key.data(using:.utf8)!, encoding:.utf8)! // referencing operator function '^' on 'BinaryInteger' requires that 'Data' conform to 'BinaryInteger'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 {
return string.data(using:.utf8)!.xor(key.data(using:.utf8)!)
}
func decrypt(_ data: Data, _ key: String) -> String {
return data.xor(key.data(using:.utf8)!).toString()
}
}
extension Data {
func xor(_ data: Data) -> Data {
return self.xor(data.bytes)
}
func xor(_ bytes: [UInt8]) -> Data {
var result = [UInt8]()
for (i, j) in self.enumerated() {
result.append(j ^ bytes[i % bytes.count])
}
return Data(result)
}
func toString() -> String {
return self.map { String(format: "%02hhx", $0) }.joined()
}
}
extension String {
func data(using encoding: String.Encoding =.utf8) -> Data {
return self.data(using: encoding)!
}
}```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 {
return string.data(using:.utf8)!.xor(key.data(using:.utf8)!)
}
func decrypt(_ data: Data, _ key: String) -> String {
return data.xor(key.data(using:.utf8)!).toString()
}
}
// MARK: -
extension Data {
func xor(_ data: Data) -> Data {
return self.xor(data.bytes)
}
func xor(_ bytes: [UInt8]) -> Data {
var result = [UInt8]()
for (i, j) in self.enumerated() {
result.append(j ^ bytes[i % bytes.count])
}
return Data(result)
}
func toString() -> String {
return self.map { String(format: "%02hhx", $0) }.joined()
}
}
extension String {
func data(using encoding: String.Encoding =.utf8) -> Data {
return self.data(using: encoding)!
}
}
```return self.xor(data.bytes) // value of type 'Data' has no member 'bytes'func data(using encoding: String.Encoding =.utf8) -> Data { // '=' must have consistent whitespace on both sidesprotocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
class RateLimiter: RateLimiterProtocol {
private let maxRequests: Int
private let timeInterval: TimeInterval
private var lastRequestTime: Date?
private var requestsMade: Int = 0
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
guard let lastRequestTime = lastRequestTime else {
lastRequestTime = Date()
return true
}
let timeSinceLastRequest = Date().timeIntervalSince(lastRequestTime)
if timeSinceLastRequest >= timeInterval {
lastRequestTime = Date()
requestsMade = 1
return true
}
requestsMade += 1
if requestsMade > maxRequests {
return false
}
return true
}
}```swift
protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter: RateLimiterProtocol {
private let maxRequests: Int
private let timeInterval: TimeInterval
private var lastRequestTime: Date?
private var requestsMade: Int = 0
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
guard let lastRequestTime = lastRequestTime else {
lastRequestTime = Date()
return true
}
let timeSinceLastRequest = Date().timeIntervalSince(lastRequestTime)
if timeSinceLastRequest >= timeInterval {
lastRequestTime = Date()
requestsMade = 1
return true
}
requestsMade += 1
if requestsMade > maxRequests {
return false
}
return true
}
}
```lastRequestTime = Date() // cannot assign to value: 'lastRequestTime' is a 'let' constantThread.sleep(forTimeInterval: 1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var lastRequestTime: Date?
private var requests: Int
// Initializer for RateLimiter.
// - Parameters:
// - maxRequests: The maximum number of requests that can be made within the defined time interval.
// - timeInterval: The time interval in which the maximum number of requests can be made.
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
self.requests = 0
}
// Determines if a new request can be made within the defined limits.
// - Returns: True if a new request can be made, false otherwise.
func allowRequest() -> Bool {
let now = Date()
if let lastRequestTime = self.lastRequestTime {
let timeSinceLastRequest = now.timeIntervalSince(lastRequestTime)
if timeSinceLastRequest < self.timeInterval {
self.requests += 1
if self.requests > self.maxRequests {
return false
}
} else {
self.requests = 1
}
}
self.lastRequestTime = now
return true
}
}```swift
protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var lastRequestTime: Date?
private var requests: Int
// Initializer for RateLimiter.
// - Parameters:
// - maxRequests: The maximum number of requests that can be made within the defined time interval.
// - timeInterval: The time interval in which the maximum number of requests can be made.
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
self.requests = 0
}
// Determines if a new request can be made within the defined limits.
// - Returns: True if a new request can be made, false otherwise.
func allowRequest() -> Bool {
let now = Date()
if let lastRequestTime = self.lastRequestTime {
let timeSinceLastRequest = now.timeIntervalSince(lastRequestTime)
if timeSinceLastRequest < self.timeInterval {
self.requests += 1
if self.requests > self.maxRequests {
return false
}
} else {
self.requests = 1
}
}
self.lastRequestTime = now
return true
}
}
```init(maxRequests: Int, timeInterval: TimeInterval) { // initializer requirement 'init(maxRequests:timeInterval:)' can only be satisfied by a 'required' initializer in non-final class 'RateLimiter'Thread.sleep(forTimeInterval: 1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
class RateLimiter: RateLimiterProtocol {
private let maxRequests: Int
private let timeInterval: TimeInterval
private var lastRequestTime: TimeInterval = 0
private var requestsSinceLastTime: Int = 0
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let currentTime = Date().timeIntervalSince1970
let timeSinceLastRequest = currentTime - lastRequestTime
let requestsSinceLastTime = Int(timeSinceLastRequest / timeInterval)
let requestsSinceLastTimeWithNewRequest = requestsSinceLastTime + 1
let requestsSinceLastTimeWithNewRequestLessThanMaxRequests = requestsSinceLastTimeWithNewRequest <= maxRequests
if requestsSinceLastTimeWithNewRequestLessThanMaxRequests {
lastRequestTime = currentTime
self.requestsSinceLastTime = requestsSinceLastTimeWithNewRequest
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 lastRequestTime: TimeInterval = 0
private var requestsSinceLastTime: Int = 0
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let currentTime = Date().timeIntervalSince1970
let timeSinceLastRequest = currentTime - lastRequestTime
let requestsSinceLastTime = Int(timeSinceLastRequest / timeInterval)
let requestsSinceLastTimeWithNewRequest = requestsSinceLastTime + 1
let requestsSinceLastTimeWithNewRequestLessThanMaxRequests = requestsSinceLastTimeWithNewRequest <= maxRequests
if requestsSinceLastTimeWithNewRequestLessThanMaxRequests {
lastRequestTime = currentTime
self.requestsSinceLastTime = requestsSinceLastTimeWithNewRequest
return true
}
return false
}
}
```Thread.sleep(forTimeInterval: 1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6 // XCTAssertTrue failedprotocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
class RateLimiter: RateLimiterProtocol {
private let maxRequests: Int
private let timeInterval: TimeInterval
private var lastRequestTime: TimeInterval = 0
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let currentTime = Date().timeIntervalSince1970
let timeSinceLastRequest = currentTime - lastRequestTime
if timeSinceLastRequest > timeInterval {
lastRequestTime = currentTime
return true
}
return false
}
}```swift
protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter: RateLimiterProtocol {
private let maxRequests: Int
private let timeInterval: TimeInterval
private var lastRequestTime: TimeInterval = 0
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let currentTime = Date().timeIntervalSince1970
let timeSinceLastRequest = currentTime - lastRequestTime
if timeSinceLastRequest > timeInterval {
lastRequestTime = currentTime
return true
}
return false
}
}
// 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 lastRequestTime: TimeInterval = 0
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let currentTime = Date().timeIntervalSince1970
let timeSinceLastRequest = currentTime - lastRequestTime
if timeSinceLastRequest > timeInterval {
lastRequestTime = currentTime
return true
}
return false
}
}
```Thread.sleep(forTimeInterval: 1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6 // XCTAssertTrue failedprotocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var lastRequestTime: TimeInterval
private var requests: Int
// Initializer
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
self.lastRequestTime = 0
self.requests = 0
}
// Determines if a new request can be made within the defined limits.
func allowRequest() -> Bool {
let currentTime = Date().timeIntervalSince1970
let timeSinceLastRequest = currentTime - lastRequestTime
let timeSinceLastRequestSeconds = Int(timeSinceLastRequest)
let requestsSinceLastRequest = requests - timeSinceLastRequestSeconds
if requestsSinceLastRequest < maxRequests && timeSinceLastRequest > timeInterval {
lastRequestTime = currentTime
requests = 0
return true
} else if requestsSinceLastRequest < maxRequests {
requests += 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 var maxRequests: Int
private var timeInterval: TimeInterval
private var lastRequestTime: TimeInterval
private var requests: Int
// Initializer
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
self.lastRequestTime = 0
self.requests = 0
}
// Determines if a new request can be made within the defined limits.
func allowRequest() -> Bool {
let currentTime = Date().timeIntervalSince1970
let timeSinceLastRequest = currentTime - lastRequestTime
let timeSinceLastRequestSeconds = Int(timeSinceLastRequest)
let requestsSinceLastRequest = requests - timeSinceLastRequestSeconds
if requestsSinceLastRequest < maxRequests && timeSinceLastRequest > timeInterval {
lastRequestTime = currentTime
requests = 0
return true
} else if requestsSinceLastRequest < maxRequests {
requests += 1
return true
} else {
return false
}
}
}
```Thread.sleep(forTimeInterval: 1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6 // XCTAssertFalse failedprotocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var lastRequestTime: TimeInterval = 0
private var requests: Int = 0
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let currentTime = Date().timeIntervalSince1970
let timeSinceLastRequest = currentTime - lastRequestTime
if timeSinceLastRequest > timeInterval {
lastRequestTime = currentTime
requests = 1
return true
} else 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 var maxRequests: Int
private var timeInterval: TimeInterval
private var lastRequestTime: TimeInterval = 0
private var requests: Int = 0
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let currentTime = Date().timeIntervalSince1970
let timeSinceLastRequest = currentTime - lastRequestTime
if timeSinceLastRequest > timeInterval {
lastRequestTime = currentTime
requests = 1
return true
} else 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 lastRequestTime: TimeInterval = 0
private var requests: Int = 0
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let currentTime = Date().timeIntervalSince1970
let timeSinceLastRequest = currentTime - lastRequestTime
if timeSinceLastRequest > timeInterval {
lastRequestTime = currentTime
requests = 1
return true
} else 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 lastRequestTime: TimeInterval = 0
private var requests: Int = 0
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let currentTime = Date().timeIntervalSince1970
let timeSinceLastRequest = currentTime - lastRequestTime
if timeSinceLastRequest > timeInterval {
lastRequestTime = currentTime
requests = 1
return true
} else 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 lastRequestTime: TimeInterval = 0
private var requests: Int = 0
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let currentTime = Date().timeIntervalSince1970
let timeSinceLastRequest = currentTime - lastRequestTime
if timeSinceLastRequest >= timeInterval {
lastRequestTime = currentTime
requests = 1
return true
} else {
requests += 1
if requests > maxRequests {
return false
} else {
return true
}
}
}
}```swift
protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter: RateLimiterProtocol {
private let maxRequests: Int
private let timeInterval: TimeInterval
private var lastRequestTime: TimeInterval = 0
private var requests: Int = 0
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let currentTime = Date().timeIntervalSince1970
let timeSinceLastRequest = currentTime - lastRequestTime
if timeSinceLastRequest >= timeInterval {
lastRequestTime = currentTime
requests = 1
return true
} else {
requests += 1
if requests > maxRequests {
return false
} else {
return true
}
}
}
}
```Thread.sleep(forTimeInterval: 1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var lastRequestTime: TimeInterval
private var requests: Int
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
self.lastRequestTime = 0
self.requests = 0
}
func allowRequest() -> Bool {
let currentTime = NSDate().timeIntervalSince1970
let timeSinceLastRequest = currentTime - lastRequestTime
if timeSinceLastRequest > timeInterval {
lastRequestTime = currentTime
requests = 1
return true
} else {
requests += 1
if requests > maxRequests {
return false
} else {
return true
}
}
}
}```swift
protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var lastRequestTime: TimeInterval
private var requests: Int
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
self.lastRequestTime = 0
self.requests = 0
}
func allowRequest() -> Bool {
let currentTime = NSDate().timeIntervalSince1970
let timeSinceLastRequest = currentTime - lastRequestTime
if timeSinceLastRequest > timeInterval {
lastRequestTime = currentTime
requests = 1
return true
} else {
requests += 1
if requests > maxRequests {
return false
} else {
return true
}
}
}
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var lastRequestTime: TimeInterval
private var requests: Int
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
self.lastRequestTime = 0
self.requests = 0
}
func allowRequest() -> Bool {
let currentTime = NSDate().timeIntervalSince1970
let timeSinceLastRequest = currentTime - lastRequestTime
if timeSinceLastRequest > timeInterval {
lastRequestTime = currentTime
requests = 1
return true
} else {
requests += 1
if requests > maxRequests {
return false
} else {
return true
}
}
}
}
```Thread.sleep(forTimeInterval: 1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
class RateLimiter: RateLimiterProtocol {
private let maxRequests: Int
private let timeInterval: TimeInterval
private var lastRequestTime: TimeInterval = 0
private var requests: Int = 0
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let currentTime = Date().timeIntervalSince1970
let timeSinceLastRequest = currentTime - lastRequestTime
if timeSinceLastRequest > timeInterval {
requests = 0
lastRequestTime = currentTime
}
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 lastRequestTime: TimeInterval = 0
private var requests: Int = 0
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let currentTime = Date().timeIntervalSince1970
let timeSinceLastRequest = currentTime - lastRequestTime
if timeSinceLastRequest > timeInterval {
requests = 0
lastRequestTime = currentTime
}
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 ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var counter: Int
private let lock = NSLock()
required init(value: Int) {
counter = value
}
func increment() {
lock.lock()
defer { lock.unlock() }
counter += 1
}
func currentValue() -> Int {
return counter
}
}```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 counter: Int
private let lock = NSLock()
required init(value: Int) {
counter = value
}
func increment() {
lock.lock()
defer { lock.unlock() }
counter += 1
}
func currentValue() -> Int {
return counter
}
}
```protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var counter: Int
private let lock = NSLock()
required init(value: Int) {
self.counter = value
}
func increment() {
lock.lock()
defer {
lock.unlock()
}
counter += 1
}
func currentValue() -> Int {
lock.lock()
defer {
lock.unlock()
}
return counter
}
}```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 counter: Int
private let lock = NSLock()
required init(value: Int) {
self.counter = value
}
func increment() {
lock.lock()
defer {
lock.unlock()
}
counter += 1
}
func currentValue() -> Int {
lock.lock()
defer {
lock.unlock()
}
return counter
}
}
```protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var counter: Int
private let lock = NSLock()
required init(value: Int) {
self.counter = value
}
func increment() {
lock.lock()
defer {
lock.unlock()
}
counter += 1
}
func currentValue() -> Int {
lock.lock()
defer {
lock.unlock()
}
return counter
}
}```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 counter: Int
private let lock = NSLock()
required init(value: Int) {
self.counter = value
}
func increment() {
lock.lock()
defer {
lock.unlock()
}
counter += 1
}
func currentValue() -> Int {
lock.lock()
defer {
lock.unlock()
}
return counter
}
}
```protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var counter: Int
private let lock = NSLock()
required init(value: Int) {
self.counter = value
}
func increment() {
lock.lock()
defer { lock.unlock() }
counter += 1
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return counter
}
}```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 counter: Int
private let lock = NSLock()
required init(value: Int) {
self.counter = value
}
func increment() {
lock.lock()
defer { lock.unlock() }
counter += 1
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return counter
}
}
```protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var counter: Int
private let lock = NSLock()
required init(value: Int) {
counter = value
}
func increment() {
lock.lock()
defer { lock.unlock() }
counter += 1
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return counter
}
}```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 counter: Int
private let lock = NSLock()
required init(value: Int) {
counter = value
}
func increment() {
lock.lock()
defer { lock.unlock() }
counter += 1
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return counter
}
}
```protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var counter: Int
private let lock = NSLock()
required init(value: Int) {
self.counter = value
}
func increment() {
lock.lock()
defer {
lock.unlock()
}
counter += 1
}
func currentValue() -> Int {
return counter
}
}```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 counter: Int
private let lock = NSLock()
required init(value: Int) {
self.counter = value
}
func increment() {
lock.lock()
defer {
lock.unlock()
}
counter += 1
}
func currentValue() -> Int {
return counter
}
}
```protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var counter: Int
private let lock = NSLock()
required init(value: Int) {
counter = value
}
func increment() {
lock.lock()
defer { lock.unlock() }
counter += 1
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return counter
}
}```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 counter: Int
private let lock = NSLock()
required init(value: Int) {
counter = value
}
func increment() {
lock.lock()
defer { lock.unlock() }
counter += 1
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return counter
}
}
```protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var counter: Int
private let lock = NSLock()
required init(value: Int) {
self.counter = value
}
func increment() {
lock.lock()
defer { lock.unlock() }
counter += 1
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return counter
}
}```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 counter: Int
private let lock = NSLock()
required init(value: Int) {
self.counter = value
}
func increment() {
lock.lock()
defer { lock.unlock() }
counter += 1
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return counter
}
}
```protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var counter: Int
private let lock = NSLock()
required init(value: Int) {
self.counter = value
}
func increment() {
lock.lock()
defer {
lock.unlock()
}
counter += 1
}
func currentValue() -> Int {
return counter
}
}```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 counter: Int
private let lock = NSLock()
required init(value: Int) {
self.counter = value
}
func increment() {
lock.lock()
defer {
lock.unlock()
}
counter += 1
}
func currentValue() -> Int {
return counter
}
}
```protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var counter: Int
private let lock = NSLock()
required init(value: Int) {
counter = value
}
func increment() {
lock.lock()
defer {
lock.unlock()
}
counter += 1
}
func currentValue() -> Int {
lock.lock()
defer {
lock.unlock()
}
return counter
}
}```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 counter: Int
private let lock = NSLock()
required init(value: Int) {
counter = value
}
func increment() {
lock.lock()
defer {
lock.unlock()
}
counter += 1
}
func currentValue() -> Int {
lock.lock()
defer {
lock.unlock()
}
return counter
}
}
```protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<Output>: PipelineProtocol {
typealias Output = Output
private let value: Output
private var transformations: [((Output) -> Output)] = []
init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
transformations.append(transform)
return Pipeline(value: value)
}
func execute() -> Output {
var result = value
for transform in transformations {
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<Output>: PipelineProtocol {
typealias Output = Output
private let value: Output
private var transformations: [((Output) -> Output)] = []
init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
transformations.append(transform)
return Pipeline(value: value)
}
func execute() -> Output {
var result = value
for transform in transformations {
result = transform(result)
}
return result
}
}
// Example usage
let pipeline = Pipeline(value: 1)
.pipe { $0 * 2 }
.pipe { $0 * 3 }
.pipe { $0 * 4 }
.pipe { $0 * 5 }
.pipe { $0 * 6 }
.pipe { $0 * 7 }
.pipe { $0 * 8 }
.pipe { $0 * 9 }
.pipe { $0 * 10 }
pipeline.execute()
```init(value: Output) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'Pipeline<Output>'transformations.append(transform) // cannot convert value of type '(Output) -> U' to expected argument type '(Output) -> Output'return Pipeline(value: value) // cannot convert return expression of type 'Pipeline<Output>' to return type 'Pipeline<U>'protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<Output>: PipelineProtocol {
typealias Output = Output
private let value: Output
private var transform: (Output) -> Output
private var next: PipelineProtocol?
init(value: Output) {
self.value = value
self.transform = { $0 }
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
let pipeline = Pipeline<U>(value: transform(value))
pipeline.transform = transform
pipeline.next = self
return pipeline
}
func execute() -> Output {
var current = self
while let next = current.next {
current = next
}
return current.transform(current.value)
}
}```swift
protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes.
// Ensure the final output is produced by sequentially applying transformations starting from an initial value.
class Pipeline<Output>: PipelineProtocol {
typealias Output = Output
private let value: Output
private var transform: (Output) -> Output
private var next: PipelineProtocol?
init(value: Output) {
self.value = value
self.transform = { $0 }
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
let pipeline = Pipeline<U>(value: transform(value))
pipeline.transform = transform
pipeline.next = self
return pipeline
}
func execute() -> Output {
var current = self
while let next = current.next {
current = next
}
return current.transform(current.value)
}
}
// Example usage
let pipeline = Pipeline<String>(value: "Hello")
.pipe { $0.appending(" World") }
.pipe { $0.replacingOccurrences(of: "l", with: "1") }
.pipe { $0.replacingOccurrences(of: "o", with: "0") }
.pipe { $0.replacingOccurrences(of: "e", with: "3") }
.pipe { $0.replacingOccurrences(of: " ", with: "") }
.pipe { $0.uppercased() }
print(pipeline.execute()) // HELLO103
```private var next: PipelineProtocol? // use of protocol 'PipelineProtocol' as a type must be written 'any PipelineProtocol'init(value: Output) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'Pipeline<Output>'pipeline.transform = transform // cannot assign value of type '(Output) -> U' to type '(U) -> U'current = next // cannot assign value of type 'any PipelineProtocol' to type 'Pipeline<Output>'protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<Output>: PipelineProtocol {
typealias Output = Output
private let value: Output
private var transformations: [((Output) -> Output)?] = []
init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
let pipeline = Pipeline<U>(value: transform(value))
transformations.append(transform)
return pipeline
}
func execute() -> Output {
var result = value
for transform in transformations {
result = transform?(result)?? 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<Output>: PipelineProtocol {
typealias Output = Output
private let value: Output
private var transformations: [((Output) -> Output)?] = []
init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
let pipeline = Pipeline<U>(value: transform(value))
transformations.append(transform)
return pipeline
}
func execute() -> Output {
var result = value
for transform in transformations {
result = transform?(result)?? result
}
return result
}
}
// Example usage
let pipeline = Pipeline<Int>(value: 1)
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.init(value: Output) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'Pipeline<Output>'transformations.append(transform) // cannot convert value of type '(Output) -> U' to expected argument type '((Output) -> Output)?'result = transform?(result)?? result // variable is unusedresult = transform?(result)?? result // cannot use optional chaining on non-optional value of type 'Output'result = transform?(result)?? result // consecutive statements on a line must be separated by ';'result = transform?(result)?? result // value of optional type 'Output?' must be unwrapped to a value of type 'Output'result = transform?(result)?? result // cannot use optional chaining on non-optional value of type 'Output'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
let value: Output
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
let value: Output
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<Int>(value: 1)
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.execute()
print(pipeline)
```init(value: Output) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'Pipeline<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 let value: Output
private var transforms: [((Output) -> Output)] = []
init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
let pipeline = Pipeline<U>(value: transform(value))
transforms.append(transform)
return pipeline
}
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 let value: Output
private var transforms: [((Output) -> Output)] = []
init(value: Output) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
let pipeline = Pipeline<U>(value: transform(value))
transforms.append(transform)
return pipeline
}
func execute() -> Output {
var result = value
for transform in transforms {
result = transform(result)
}
return result
}
}
// Example usage:
let pipeline = Pipeline<Int>(value: 1)
let result = pipeline.pipe { $0 * 2 }.pipe { $0 + 1 }.execute()
print(result)
```init(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<Output>: PipelineProtocol {
typealias Output = Output
private var value: Output
private var transform: ((Output) -> Output)?
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 transform?(value)?? value
}
}```swift
protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes.
// Ensure the final output is produced by sequentially applying transformations starting from an initial value.
class Pipeline<Output>: PipelineProtocol {
typealias Output = Output
private var value: Output
private var transform: ((Output) -> Output)?
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 transform?(value)?? value
}
}
// Example usage
let pipeline = Pipeline<Int>(value: 1)
let result = pipeline.pipe { $0 * 2 }.pipe { $0 + 1 }.execute()
print(result)
```init(value: Output) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'Pipeline<Output>'return transform?(value)?? value // consecutive statements on a line must be separated by ';'return transform?(value)?? value // cannot use optional chaining on non-optional value of type 'Output'return transform?(value)?? value // cannot use optional chaining on non-optional value of type 'Output'return transform?(value)?? value // property is accessed but result is unusedprotocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<Output>: PipelineProtocol {
private let value: Output
private var transform: (Output) -> Output
init(value: Output) {
self.value = value
self.transform = { $0 }
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
return Pipeline<U>(value: transform(value))
}
func execute() -> Output {
return transform(value)
}
}```swift
protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes.
// Ensure the final output is produced by sequentially applying transformations starting from an initial value.
class Pipeline<Output>: PipelineProtocol {
private let value: Output
private var transform: (Output) -> Output
init(value: Output) {
self.value = value
self.transform = { $0 }
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
return Pipeline<U>(value: transform(value))
}
func execute() -> Output {
return transform(value)
}
}
// Example usage
let pipeline = Pipeline<Int>(value: 1)
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.execute()
```init(value: Output) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'Pipeline<Output>'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
let value: Output
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
let value: Output
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<Int>(value: 1)
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.execute()
print(pipeline)
```init(value: Output) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'Pipeline<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
var value: Output
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
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<Int>(value: 1)
.pipe { $0 * 2 }
.pipe { $0 + 2 }
.pipe { $0 * 3 }
.execute()
print(pipeline) // 12
```init(value: Output) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'Pipeline<T>'protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<Output>: PipelineProtocol {
private var value: Output
private var transform: (Output) -> Output
init(value: Output, transform: @escaping (Output) -> Output) {
self.value = value
self.transform = transform
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
return Pipeline<U>(value: transform(value), transform: transform)
}
func execute() -> Output {
return transform(value)
}
}```swift
protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes.
// Ensure the final output is produced by sequentially applying transformations starting from an initial value.
class Pipeline<Output>: PipelineProtocol {
private var value: Output
private var transform: (Output) -> Output
init(value: Output, transform: @escaping (Output) -> Output) {
self.value = value
self.transform = transform
}
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U> {
return Pipeline<U>(value: transform(value), transform: transform)
}
func execute() -> Output {
return transform(value)
}
}
// Example usage
let pipeline = Pipeline<Int>(value: 1) { $0 * 2 }
.pipe { $0 * 3 }
.pipe { $0 * 4 }
.pipe { $0 * 5 }
.execute()
```class Pipeline<Output>: PipelineProtocol { // type 'Pipeline<Output>' does not conform to protocol 'PipelineProtocol'return Pipeline<U>(value: transform(value), transform: transform) // cannot convert value of type '(Output) -> U' to expected argument type '(U) -> U'let received = Pipeline(value: "Hello!") // missing argument for parameter 'transform' in callprotocol 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 Observer = (Value) -> Void
private var observers: [UUID: Observer] = [:]
private var value: Value
init(value: Value) {
self.value = value
}
var value: Value {
get {
return self.value
}
set {
self.value = newValue
self.notifyObservers()
}
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
self.observers[uuid] = observer
return uuid
}
func unsubscribe(_ observer: UUID) {
self.observers[observer] = nil
}
private func notifyObservers() {
for observer in self.observers.values {
observer(self.value)
}
}
}```swift
protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
// Generic observable property that notifies observers of value changes.
class ObservableProperty<Value> : ObservablePropertyProtocol {
typealias Observer = (Value) -> Void
private var observers: [UUID: Observer] = [:]
private var value: Value
init(value: Value) {
self.value = value
}
var value: Value {
get {
return self.value
}
set {
self.value = newValue
self.notifyObservers()
}
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
self.observers[uuid] = observer
return uuid
}
func unsubscribe(_ observer: UUID) {
self.observers[observer] = nil
}
private func notifyObservers() {
for observer in self.observers.values {
observer(self.value)
}
}
}
```private var value: Value // property 'value' must be declared internal because it matches a requirement in internal protocol 'ObservablePropertyProtocol'init(value: Value) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ObservableProperty<Value>'var value: Value { // invalid redeclaration of 'value'protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
class ObservableProperty<Value> : ObservablePropertyProtocol {
typealias Observer = (Value) -> Void
private var observers: [UUID: Observer] = [:]
private var _value: Value
init(value: Value) {
_value = value
}
var value: Value {
get {
return _value
}
set {
_value = newValue
notifyObservers()
}
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
return uuid
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
private 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 {
typealias Observer = (Value) -> Void
private var observers: [UUID: Observer] = [:]
private var _value: Value
init(value: Value) {
_value = value
}
var value: Value {
get {
return _value
}
set {
_value = newValue
notifyObservers()
}
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
return uuid
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
private func notifyObservers() {
for observer in observers.values {
observer(_value)
}
}
}
```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 {
typealias Observer = (Value) -> Void
private var observers: [UUID: Observer] = [:]
private var _value: Value
init(value: Value) {
self._value = value
}
var value: Value {
get {
return _value
}
set {
_value = newValue
notifyObservers()
}
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers[id] = observer
return id
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
private 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 {
typealias Observer = (Value) -> Void
private var observers: [UUID: Observer] = [:]
private var _value: Value
init(value: Value) {
self._value = value
}
var value: Value {
get {
return _value
}
set {
_value = newValue
notifyObservers()
}
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers[id] = observer
return id
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
private func notifyObservers() {
for observer in observers.values {
observer(_value)
}
}
}
```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
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers[id] = observer
observer(value)
return id
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
var value: Value {
get {
return self.value
}
set {
self.value = newValue
observers.values.forEach { $0(newValue) }
}
}
}
class ObservablePropertyWithDefault<Value> : ObservableProperty<Value> {
private var defaultValue: Value
init(value: Value, defaultValue: Value) {
self.defaultValue = defaultValue
super.init(value: value)
}
override var value: Value {
get {
return super.value
}
set {
super.value = newValue
}
}
override func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers[id] = observer
observer(value)
return id
}
override func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
}```swift
protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
// Generic observable property that notifies observers of value changes.
class ObservableProperty<Value> : 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 id = UUID()
observers[id] = observer
observer(value)
return id
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
var value: Value {
get {
return self.value
}
set {
self.value = newValue
observers.values.forEach { $0(newValue) }
}
}
}
// A property that notifies observers of value changes and also has a default value.
class ObservablePropertyWithDefault<Value> : ObservableProperty<Value> {
private var defaultValue: Value
init(value: Value, defaultValue: Value) {
self.defaultValue = defaultValue
super.init(value: value)
}
override var value: Value {
get {
return super.value
}
set {
super.value = newValue
}
}
override func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers[id] = observer
observer(value)
return id
}
override func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
}
```private var value: Value // property 'value' must be declared internal because it matches a requirement in internal protocol 'ObservablePropertyProtocol'init(value: Value) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ObservableProperty<Value>'var value: Value { // invalid redeclaration of 'value'observers[id] = observer // 'observers' is inaccessible due to 'private' protection levelobservers[observer] = nil // 'observers' is inaccessible due to 'private' protection levelobservers[observer] = nil // 'nil' requires a contextual typeprotocol 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 Observer = (Value) -> Void
private var observers = [UUID: Observer]()
private var value: Value
init(value: Value) {
self.value = value
}
var value: Value {
get {
return self.value
}
set {
self.value = newValue
self.notifyObservers()
}
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
self.observers[id] = observer
return id
}
func unsubscribe(_ observer: UUID) {
self.observers[observer] = nil
}
private func notifyObservers() {
for observer in self.observers.values {
observer(self.value)
}
}
}```swift
protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
// Generic observable property that notifies observers of value changes.
class ObservableProperty<Value> : ObservablePropertyProtocol {
typealias Observer = (Value) -> Void
private var observers = [UUID: Observer]()
private var value: Value
init(value: Value) {
self.value = value
}
var value: Value {
get {
return self.value
}
set {
self.value = newValue
self.notifyObservers()
}
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
self.observers[id] = observer
return id
}
func unsubscribe(_ observer: UUID) {
self.observers[observer] = nil
}
private func notifyObservers() {
for observer in self.observers.values {
observer(self.value)
}
}
}
```private var value: Value // property 'value' must be declared internal because it matches a requirement in internal protocol 'ObservablePropertyProtocol'init(value: Value) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ObservableProperty<Value>'var value: Value { // invalid redeclaration of 'value'protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
class ObservableProperty<Value> : ObservablePropertyProtocol {
typealias Observer = (Value) -> Void
private var observers = [UUID: Observer]()
private var _value: Value
init(value: Value) {
self._value = value
}
var value: Value {
get {
return _value
}
set {
_value = newValue
notifyObservers()
}
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers[id] = observer
return id
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
private 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 {
typealias Observer = (Value) -> Void
private var observers = [UUID: Observer]()
private var _value: Value
init(value: Value) {
self._value = value
}
var value: Value {
get {
return _value
}
set {
_value = newValue
notifyObservers()
}
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers[id] = observer
return id
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
private func notifyObservers() {
for observer in observers.values {
observer(_value)
}
}
}
```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
init(value: Value) {
self.value = value
}
var value: Value {
get {
return self.value
}
set {
self.value = newValue
self.notifyObservers()
}
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
self.observers[id] = observer
return id
}
func unsubscribe(_ observer: UUID) {
self.observers[observer] = nil
}
private func notifyObservers() {
for observer in self.observers.values {
observer(self.value)
}
}
}```swift
protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
// Generic observable property that notifies observers of value changes.
class ObservableProperty<Value> : ObservablePropertyProtocol {
private var observers = [UUID: (Value) -> Void]()
private var value: Value
init(value: Value) {
self.value = value
}
var value: Value {
get {
return self.value
}
set {
self.value = newValue
self.notifyObservers()
}
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
self.observers[id] = observer
return id
}
func unsubscribe(_ observer: UUID) {
self.observers[observer] = nil
}
private func notifyObservers() {
for observer in self.observers.values {
observer(self.value)
}
}
}
```private var value: Value // property 'value' must be declared internal because it matches a requirement in internal protocol 'ObservablePropertyProtocol'init(value: Value) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ObservableProperty<Value>'var value: Value { // invalid redeclaration of 'value'protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
class ObservableProperty<Value> : ObservablePropertyProtocol {
private var observers = [UUID: (Value) -> Void]()
private var _value: Value
var value: Value {
get {
return _value
}
set {
_value = newValue
observers.forEach { $0.value(_value) }
}
}
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
}
}```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
var value: Value {
get {
return _value
}
set {
_value = newValue
observers.forEach { $0.value(_value) }
}
}
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
}
}
// Observable property that notifies observers of value changes.
class ObservableProperty<Value> : ObservablePropertyProtocol {
private var observers = [UUID: (Value) -> Void]()
private var _value: Value
var value: Value {
get {
return _value
}
set {
_value = newValue
observers.forEach { $0.value(_value) }
}
}
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
}
}
```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 {
typealias Observer = (Value) -> Void
private var observers = [UUID: Observer]()
private var value: Value
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers[id] = observer
observer(value)
return id
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
var value: Value {
get {
return self.value
}
set {
self.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 Observer = (Value) -> Void
private var observers = [UUID: Observer]()
private var value: Value
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers[id] = observer
observer(value)
return id
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
var value: Value {
get {
return self.value
}
set {
self.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'init(value: Value) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ObservableProperty<Value>'var value: Value { // invalid redeclaration of 'value'protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
class ObservableProperty<Value> : ObservablePropertyProtocol {
typealias Observer = (Value) -> Void
private var observers: [UUID: Observer] = [:]
private var _value: Value
init(value: Value) {
self._value = value
}
var value: Value {
get {
return _value
}
set {
_value = newValue
notifyObservers()
}
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers[id] = observer
return id
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
private 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 {
typealias Observer = (Value) -> Void
private var observers: [UUID: Observer] = [:]
private var _value: Value
init(value: Value) {
self._value = value
}
var value: Value {
get {
return _value
}
set {
_value = newValue
notifyObservers()
}
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers[id] = observer
return id
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
private func notifyObservers() {
for observer in observers.values {
observer(_value)
}
}
}
```init(value: Value) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ObservableProperty<Value>'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: Range<Value>) {
self.init(wrappedValue: wrappedValue, range.lowerBound...range.upperBound)
}
}
extension Clamped: CustomStringConvertible {
var description: String {
return "Clamped(\(value))"
}
}
extension Clamped: CustomDebugStringConvertible {
var debugDescription: String {
return "Clamped(\(value))"
}
}
struct Person {
@Clamped(0...100) var age: 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>
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: Range<Value>) {
self.init(wrappedValue: wrappedValue, range.lowerBound...range.upperBound)
}
}
extension Clamped: CustomStringConvertible {
var description: String {
return "Clamped(\(value))"
}
}
extension Clamped: CustomDebugStringConvertible {
var debugDescription: String {
return "Clamped(\(value))"
}
}
// Usage
struct Person {
@Clamped(0...100) var age: Int
}
var person = Person(age: 100)
person.age = 100
person.age = 101
person.age = 100
person.age = 0
person.age = -1
person.age = 100
print(person.age)
// Prints "Clamped(100)"
```@Clamped(0...100) var age: Int // missing argument for parameter 'wrappedValue' in callprotocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<Value: Comparable> {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = range.clamp(wrappedValue)
self.range = range
}
var projectedValue: ClampedProtocol {
return ClampedProtocol(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> {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = range.clamp(wrappedValue)
self.range = range
}
var projectedValue: ClampedProtocol {
return ClampedProtocol(wrappedValue: wrappedValue, range)
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable> {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = range.clamp(wrappedValue)
self.range = range
}
var projectedValue: ClampedProtocol {
return ClampedProtocol(wrappedValue: wrappedValue, range)
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable> {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = range.clamp(wrappedValue)
self.range = range
}
var projectedValue: ClampedProtocol {
return ClampedProtocol(wrappedValue: wrappedValue, range)
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable> {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = range.clamp(wrappedValue)
self.range = range
}
var projectedValue: ClampedProtocol {
return ClampedProtocol(wrappedValue: wrappedValue, range)
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable> {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = range.clamp(wrappedValue)
self.range = range
}
var projectedValue: ClampedProtocol {
return ClampedProtocol(wrappedValue: wrappedValue, range)
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable> {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = range.clamp(wrappedValue)
self.range = range
}
var projectedValue: ClampedProtocol {
return ClampedProtocol(wrappedValue: wrappedValue, range)
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable> {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = range.clamp(wrappedValue)
self.range = range
}
var projectedValue: ClampedProtocol {
return ClampedProtocol(wrappedValue: wrappedValue, range)
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable> {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = range.clamp(wrappedValue)
self.range = range
}
var projectedValue: ClampedProtocol {
return ClampedProtocol(wrappedValue: wrappedValue, range)
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable> {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = range.clamp(wrappedValue)
self.range = range
}
var projectedValue: ClampedProtocol {
return ClampedProtocol(wrappedValue: wrappedValue, range)
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable> {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValueself.wrappedValue = range.clamp(wrappedValue) // value of type 'ClosedRange<Value>' has no member 'clamp'var projectedValue: ClampedProtocol { // use of protocol 'ClampedProtocol' as a type must be written 'any ClampedProtocol'return ClampedProtocol(wrappedValue: wrappedValue, range) // type 'any ClampedProtocol' cannot be instantiatedreturn ClampedProtocol(wrappedValue: wrappedValue, range) // use of protocol 'ClampedProtocol' as a type must be written 'any ClampedProtocol'return ClampedProtocol(wrappedValue: wrappedValue, range) // cannot convert value of type 'ClosedRange<Value>' to expected argument type 'ClosedRange<any Comparable>'protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
var range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: Self {
get { self }
set { self = newValue }
}
}```swift
protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
var range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: Self {
get { self }
set { self = newValue }
}
}
// Usage:
@Clamped(0...100)
var age: Int
// Usage:
@Clamped(0...100)
var age: Int
// Usage:
@Clamped(0...100)
var age: Int
// Usage:
@Clamped(0...100)
var age: Int
// Usage:
@Clamped(0...100)
var age: Int
// Usage:
@Clamped(0...100)
var age: Int
// Usage:
@Clamped(0...100)
var age: Int
// Usage:
@Clamped(0...100)
var age: Int
// Usage:
@Clamped(0...100)
var age: Int
// Usage:
@Clamped(0...100)
var age: Int
// Usage:
@Clamped(0...100)
var age: Int
// Usage:
@Clamped(0...100)
var age: Int
// Usage:
@Clamped(0...100)
var age: Int
// Usage:
@Clamped(0...100)
var age: Int
// Usage:
@Clamped(0...100)
var age: Int
// Usage:
@Clamped(0...100)
var age: Int
// Usage:
@Clamped(0...100)
var age: Int
// Usage:
@Clamped(0...100)
var age: Int
// Usage:
@Clamped(0...100)
var age: Int
// Usage:
@Clamped(0...100)
var age: Int
// Usage:
@Clamped(0...100)
var age: Int
// Usage:
@Clamped(0...100)
var age: Int
// Usage:
@Clamped(0...100)
var age: Int
// Usage:
@Clamped(0...100)
var age: Int
// Usage:
@Clamped(0...100)
var age: Int
// Usage:
@Clamped(0...100)
var age: Int
// Usage:
@Clamped(0...100)
var age: Int
// Usage:
@Clamped(0...100)
var age: Int
// Usage:
@Clamped(0...100)
var age: Int
// Usage:
@Clamped(0...100)
var age: Int
// Usage:
@Clamped(0...100)
var age: Int
// Usage:
@Clamped(0...100)
var age: Int
// Usage:
@Clamped(0...100)
var age: Int
// Usage:
@Clamped(0...100)
var age: Int
// Usage:
@Clamped(0...100)
var age: Int
// Usage:
@Clamped(0...100)
var age: Int
// Usage:
@Clamped(0...100)
var age: Int
// Usage:
@Clamped(0...100)
var age: Int
// Usage:
@Clamped(0...100)
var age: Int
// Usage:
@Clamped(0...100)
var age: Int
// Usage:
@Clamped(0...100)
var age: Int
// Usage:
@Clamped(0...100)
var age: Int
// Usage:
@Clamped(0...100)
var age: Int
// Usage:
@Clamped(0...100)
var age: Int
// Usage:
@Clamped(0...100)
var age: // XCTAssertEqual failed: (15) is not equal to (10)protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<Value: Comparable> {
var wrappedValue: Value
var range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: Clamped<Value> {
get { return self }
set { self.wrappedValue = newValue.wrappedValue }
}
}
extension Clamped: ClampedProtocol {
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.init(wrappedValue: wrappedValue, range)
}
}
extension Clamped: Equatable where Value: Equatable {
static func == (lhs: Clamped<Value>, rhs: Clamped<Value>) -> Bool {
return lhs.wrappedValue == rhs.wrappedValue
}
}
extension Clamped: Comparable where Value: Comparable {
static func < (lhs: Clamped<Value>, rhs: Clamped<Value>) -> Bool {
return lhs.wrappedValue < rhs.wrappedValue
}
}
extension Clamped: CustomStringConvertible where Value: CustomStringConvertible {
var description: String {
return "\(wrappedValue)"
}
}
extension Clamped: CustomDebugStringConvertible where Value: CustomDebugStringConvertible {
var debugDescription: String {
return "\(wrappedValue)"
}
}
extension Clamped: ExpressibleByIntegerLiteral where Value: ExpressibleByIntegerLiteral {
init(integerLiteral value: Value.IntegerLiteralType) {
self.init(wrappedValue: value, range)
}
}
extension Clamped: ExpressibleByFloatLiteral where Value: ExpressibleByFloatLiteral {
init(floatLiteral value: Value.FloatLiteralType) {
self.init(wrappedValue: value, range)
}
}
extension Clamped: ExpressibleByStringLiteral where Value: ExpressibleByStringLiteral {
init(stringLiteral value: Value.StringLiteralType) {
self.init(wrappedValue: value, range)
}
}
extension Clamped: ExpressibleByBooleanLiteral where Value: ExpressibleByBooleanLiteral {
init(booleanLiteral value: Value.BooleanLiteralType) {
self.init(wrappedValue: value, range)
}
}
extension Clamped: ExpressibleByNilLiteral where Value: ExpressibleByNilLiteral {
init(nilLiteral: ()) {
self.init(wrappedValue: nil, range)
}
}
extension Clamped: Hashable where Value: Hashable {
func hash(into hasher: inout Hasher) {
hasher.combine(wrappedValue)
}
}
extension Clamped: Codable where Value: Codable {
init(from decoder: Decoder) throws {
let container = try decoder.singleValueContainer()
let value = try container.decode(Value.self)
self.init(wrappedValue: value, range)
}
func encode(to encoder: Encoder) throws {
var container = encoder.singleValueContainer()
try container.encode(wrappedValue)
}
}
extension Clamped: Encodable where Value: Encodable {
func encode(to encoder: Encoder) throws {
var container = encoder.singleValueContainer()
try container.encode(wrappedValue)
}
}
extension Clamped: Decodable where Value: Decodable {
init(from decoder: Decoder) throws {
let container = try decoder.singleValueContainer()
let value = try container.decode(Value.self)
self.init(wrappedValue: value, range)
}
}
extension Clamped: Equatable where Value: Equatable {
static func == (lhs: Clamped<Value>, rhs: Value) -> Bool {
return lhs.wrappedValue == rhs
}
}
extension Clamped: Comparable where Value: Comparable {
static func < (lhs: Clamped<Value>, rhs: Value) -> Bool {
return lhs.wrappedValue < rhs
}
}```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> {
var wrappedValue: Value
var range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: Clamped<Value> {
get { return self }
set { self.wrappedValue = newValue.wrappedValue }
}
}
extension Clamped: ClampedProtocol {
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.init(wrappedValue: wrappedValue, range)
}
}
extension Clamped: Equatable where Value: Equatable {
static func == (lhs: Clamped<Value>, rhs: Clamped<Value>) -> Bool {
return lhs.wrappedValue == rhs.wrappedValue
}
}
extension Clamped: Comparable where Value: Comparable {
static func < (lhs: Clamped<Value>, rhs: Clamped<Value>) -> Bool {
return lhs.wrappedValue < rhs.wrappedValue
}
}
extension Clamped: CustomStringConvertible where Value: CustomStringConvertible {
var description: String {
return "\(wrappedValue)"
}
}
extension Clamped: CustomDebugStringConvertible where Value: CustomDebugStringConvertible {
var debugDescription: String {
return "\(wrappedValue)"
}
}
extension Clamped: ExpressibleByIntegerLiteral where Value: ExpressibleByIntegerLiteral {
init(integerLiteral value: Value.IntegerLiteralType) {
self.init(wrappedValue: value, range)
}
}
extension Clamped: ExpressibleByFloatLiteral where Value: ExpressibleByFloatLiteral {
init(floatLiteral value: Value.FloatLiteralType) {
self.init(wrappedValue: value, range)
}
}
extension Clamped: ExpressibleByStringLiteral where Value: ExpressibleByStringLiteral {
init(stringLiteral value: Value.StringLiteralType) {
self.init(wrappedValue: value, range)
}
}
extension Clamped: ExpressibleByBooleanLiteral where Value: ExpressibleByBooleanLiteral {
init(booleanLiteral value: Value.BooleanLiteralType) {
self.init(wrappedValue: value, range)
}
}
extension Clamped: ExpressibleByNilLiteral where Value: ExpressibleByNilLiteral {
init(nilLiteral: ()) {
self.init(wrappedValue: nil, range)
}
}
extension Clamped: Hashable where Value: Hashable {
func hash(into hasher: inout Hasher) {
hasher.combine(wrappedValue)
}
}
extension Clamped: Codable where Value: Codable {
init(from decoder: Decoder) throws {
let container = try decoder.singleValueContainer()
let value = try container.decode(Value.self)
self.init(wrappedValue: value, range)
}
func encode(to encoder: Encoder) throws {
var container = encoder.singleValueContainer()
try container.encode(wrappedValue)
}
}
extension Clamped: Encodable where Value: Encodable {
func encode(to encoder: Encoder) throws {
var container = encoder.singleValueContainer()
try container.encode(wrappedValue)
}
}
extension Clamped: Decodable where Value: Decodable {
init(from decoder: Decoder) throws {
let container = try decoder.singleValueContainer()
let value = try container.decode(Value.self)
self.init(wrappedValue: value, range)
}
}
extension Clamped: Equatable where Value: Equatable {
static func == (lhs: Clamped<Value>, rhs: Value) -> Bool {
return lhs.wrappedValue == rhs
}
}
extension Clamped: Comparable where Value: Comparable {
static func < (lhs: Clamped<Value>, rhs: Value) -> Bool {
return lhs.wrappedValue < rhs
}
}
extension Clamped: CustomStringConvertible where Value: CustomStringConvertible {
var description: String {
return "\(wrappedValue)"
}
}
extension Clamped: CustomDebugStringConvertible where Value: CustomDebugStringConvertible {
var debugDescription: String {
return "\(wrappedValue)"
}
}
extension Clamped: ExpressibleByIntegerLiteral where Value: ExpressibleByIntegerLiteral {
init(integerLiteral value: Value.IntegerLiteralType) {
self.init(wrappedValue:init(wrappedValue: Value, _ range: ClosedRange<Value>) { // invalid redeclaration of 'init(wrappedValue:_:)'self.init(wrappedValue: value, range) // cannot convert value of type 'Value.IntegerLiteralType' to expected argument type 'Value'self.init(wrappedValue: value, range) // cannot convert value of type 'Value.FloatLiteralType' to expected argument type 'Value'extension Clamped: ExpressibleByStringLiteral where Value: ExpressibleByStringLiteral { // conditional conformance of type 'Clamped<Value>' to protocol 'ExpressibleByStringLiteral' does not imply conformance to inherited protocol 'ExpressibleByUnicodeScalarLiteral'extension Clamped: ExpressibleByStringLiteral where Value: ExpressibleByStringLiteral { // conditional conformance of type 'Clamped<Value>' to protocol 'ExpressibleByStringLiteral' does not imply conformance to inherited protocol 'ExpressibleByExtendedGraphemeClusterLiteral'self.init(wrappedValue: value, range) // cannot convert value of type 'Value.StringLiteralType' to expected argument type 'Value'self.init(wrappedValue: value, range) // cannot convert value of type 'Value.BooleanLiteralType' to expected argument type 'Value'extension Clamped: Encodable where Value: Encodable { // conflicting conformance of 'Clamped<Value>' to protocol 'Encodable'; there cannot be more than one conformance, even with different conditional boundsextension Clamped: Decodable where Value: Decodable { // conflicting conformance of 'Clamped<Value>' to protocol 'Decodable'; there cannot be more than one conformance, even with different conditional boundsextension Clamped: Equatable where Value: Equatable { // redundant conformance of 'Clamped<Value>' to protocol 'Equatable'extension Clamped: Comparable where Value: Comparable { // redundant conformance of 'Clamped<Value>' to protocol 'Comparable'protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<T: Comparable> {
private var value: T
private let range: ClosedRange<T>
init(wrappedValue: T, _ range: ClosedRange<T>) {
self.value = wrappedValue
self.range = range
}
var wrappedValue: T {
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<T: Comparable> {
private var value: T
private let range: ClosedRange<T>
init(wrappedValue: T, _ range: ClosedRange<T>) {
self.value = wrappedValue
self.range = range
}
var wrappedValue: T {
get { value }
set { value = min(max(newValue, range.lowerBound), range.upperBound) }
}
}
// Usage:
@Clamped(0...10) var value: Int
```protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<T: Comparable> {
var wrappedValue: T
let range: ClosedRange<T>
init(wrappedValue: T, _ range: ClosedRange<T>) {
self.wrappedValue = min(max(wrappedValue, range.lowerBound), 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<T: Comparable> {
var wrappedValue: T
let range: ClosedRange<T>
init(wrappedValue: T, _ range: ClosedRange<T>) {
self.wrappedValue = min(max(wrappedValue, range.lowerBound), range.upperBound)
self.range = range
}
}
// Usage:
@Clamped(0...10) var value: Int
``` // XCTAssertEqual failed: (15) is not equal to (10)protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<Value: Comparable> {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = min(max(wrappedValue, range.lowerBound), 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> {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = min(max(wrappedValue, range.lowerBound), range.upperBound)
self.range = range
}
}
// Usage:
@Clamped(0...10) var value: Int
``` // XCTAssertEqual failed: (15) is not equal to (10)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) }
}
}
// Usage:
@Clamped(0...100)
var myClampedValue: Int
```protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<Value: Comparable> {
private let range: ClosedRange<Value>
private var value: Value
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.range = range
self.value = min(max(wrappedValue, range.lowerBound), range.upperBound)
}
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 let range: ClosedRange<Value>
private var value: Value
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.range = range
self.value = min(max(wrappedValue, range.lowerBound), range.upperBound)
}
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> {
var wrappedValue: Value
var range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: ClampedProtocol {
get { return self }
set { self.wrappedValue = newValue.wrappedValue }
}
}
extension Clamped: ClampedProtocol {
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.init(wrappedValue: wrappedValue, range)
}
}
extension Clamped: RandomAccessCollection {
typealias Index = Int
typealias Element = Value
var startIndex: Index { return range.startIndex }
var endIndex: Index { return range.endIndex }
func index(after i: Index) -> Index { return range.index(after: i) }
func index(before i: Index) -> Index { return range.index(before: i) }
subscript(position: Index) -> Value {
get { return range[position] }
set { self.wrappedValue = range[position] }
}
}
extension Clamped: CustomStringConvertible {
var description: String { return "\(wrappedValue)" }
}
extension Clamped: CustomDebugStringConvertible {
var debugDescription: String { return "\(wrappedValue)" }
}
extension Clamped: ExpressibleByIntegerLiteral {
init(integerLiteral value: Value) {
self.init(wrappedValue: value, range)
}
}
extension Clamped: ExpressibleByFloatLiteral {
init(floatLiteral value: Value) {
self.init(wrappedValue: value, range)
}
}
extension Clamped: ExpressibleByStringLiteral {
init(stringLiteral value: Value) {
self.init(wrappedValue: value, range)
}
}
extension Clamped: ExpressibleByBooleanLiteral {
init(booleanLiteral value: Value) {
self.init(wrappedValue: value, range)
}
}
extension Clamped: ExpressibleByNilLiteral {
init(nilLiteral: ()) {
self.init(wrappedValue: nil, range)
}
}
extension Clamped: ExpressibleByArrayLiteral {
init(arrayLiteral elements: Value...) {
self.init(wrappedValue: elements[0], range)
}
}
extension Clamped: ExpressibleByDictionaryLiteral {
init(dictionaryLiteral elements: (Value, Value)...) {
self.init(wrappedValue: elements[0].0, range)
}
}
extension Clamped: ExpressibleByExtendedGraphemeClusterLiteral {
init(extendedGraphemeClusterLiteral value: Value) {
self.init(wrappedValue: value, range)
}
}
extension Clamped: ExpressibleByUnicodeScalarLiteral {
init(unicodeScalarLiteral value: Value) {
self.init(wrappedValue: value, range)
}
}
extension Clamped: ExpressibleByBuiltinIntegerLiteral {
init(builtinIntegerLiteral value: Value) {
self.init(wrappedValue: value, range)
}
}
extension Clamped: ExpressibleByBuiltinFloatLiteral {
init(builtinFloatLiteral value: Value) {
self.init(wrappedValue: value, range)
}
}
extension Clamped: ExpressibleByBuiltinBooleanLiteral {
init(builtinBooleanLiteral value: Value) {
self.init(wrappedValue: value, range)
}
}
extension Clamped: ExpressibleByBuiltinNilLiteral {
init(builtinNilLiteral: ()) {
self.init(wrappedValue: nil, range)
}
}
extension Clamped: ExpressibleByBuiltinArrayLiteral {
init(builtinArrayLiteral elements: Value...) {
self.init(wrappedValue: elements[0], range)
}
}
extension Clamped: ExpressibleByBuiltinDictionaryLiteral {
init(builtinDictionaryLiteral elements: (Value, Value)...) {
self.init(wrappedValue: elements[0].0, range)
}
}
extension Clamped: ExpressibleByBuiltinExtendedGraphemeClusterLiteral {
init(builtinExtendedGraphemeClusterLiteral value: Value) {
self.init(wrappedValue: value, 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> {
var wrappedValue: Value
var range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue
self.range = range
}
var projectedValue: ClampedProtocol {
get { return self }
set { self.wrappedValue = newValue.wrappedValue }
}
}
extension Clamped: ClampedProtocol {
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.init(wrappedValue: wrappedValue, range)
}
}
extension Clamped: RandomAccessCollection {
typealias Index = Int
typealias Element = Value
var startIndex: Index { return range.startIndex }
var endIndex: Index { return range.endIndex }
func index(after i: Index) -> Index { return range.index(after: i) }
func index(before i: Index) -> Index { return range.index(before: i) }
subscript(position: Index) -> Value {
get { return range[position] }
set { self.wrappedValue = range[position] }
}
}
extension Clamped: CustomStringConvertible {
var description: String { return "\(wrappedValue)" }
}
extension Clamped: CustomDebugStringConvertible {
var debugDescription: String { return "\(wrappedValue)" }
}
extension Clamped: ExpressibleByIntegerLiteral {
init(integerLiteral value: Value) {
self.init(wrappedValue: value, range)
}
}
extension Clamped: ExpressibleByFloatLiteral {
init(floatLiteral value: Value) {
self.init(wrappedValue: value, range)
}
}
extension Clamped: ExpressibleByStringLiteral {
init(stringLiteral value: Value) {
self.init(wrappedValue: value, range)
}
}
extension Clamped: ExpressibleByBooleanLiteral {
init(booleanLiteral value: Value) {
self.init(wrappedValue: value, range)
}
}
extension Clamped: ExpressibleByNilLiteral {
init(nilLiteral: ()) {
self.init(wrappedValue: nil, range)
}
}
extension Clamped: ExpressibleByArrayLiteral {
init(arrayLiteral elements: Value...) {
self.init(wrappedValue: elements[0], range)
}
}
extension Clamped: ExpressibleByDictionaryLiteral {
init(dictionaryLiteral elements: (Value, Value)...) {
self.init(wrappedValue: elements[0].0, range)
}
}
extension Clamped: ExpressibleByExtendedGraphemeClusterLiteral {
init(extendedGraphemeClusterLiteral value: Value) {
self.init(wrappedValue: value, range)
}
}
extension Clamped: ExpressibleByUnicodeScalarLiteral {
init(unicodeScalarLiteral value: Value) {
self.init(wrappedValue: value, range)
}
}
extension Clamped: ExpressibleByBuiltinIntegerLiteral {
init(builtinIntegerLiteral value: Value) {
self.init(wrappedValue: value, range)
}
}
extension Clamped: ExpressibleByBuiltinFloatLiteral {
init(builtinFloatLiteral value: Value) {
self.init(wrappedValue: value, range)
}
}
extension Clamped: ExpressibleByBuiltinBooleanLiteral {
init(builtinBooleanLiteral value: Value) {
self.init(wrappedValue: value, range)
}
}
extension Clamped: ExpressibleByBuiltinNilLiteral {
init(builtinNilLiteral: ()) {
self.init(wrappedValue: nil, range)
}
}
extension Clamped: ExpressibleByBuiltinArrayLiteral {
init(builtinArrayLiteral elements: Value...) {
self.init(wrappedValue: elements[0], range)
}
}
extension Clamped: ExpressibleByBuiltinDictionaryLiteral {
init(builtinDictionaryLiteral elements: (Value, Value)...) {
self.init(wrappedValue: elements[0].0, range)
}
}
extension Clamped: ExpressibleByBuiltinExtendedGraphemeClusterLiteral {
init(builtinExtendedGraphemeClusterLiteral value: Value) {
self.init(wrappedValue: value, range)
}
}
extension Clamped: ExpressibleByBuiltinUnicodeScalarLiteral {
init(builtinUnicodeScalarLiteral value: Value) {
self.init(wrappedValue: value,var projectedValue: ClampedProtocol { // use of protocol 'ClampedProtocol' as a type must be written 'any ClampedProtocol'set { self.wrappedValue = newValue.wrappedValue } // value of type 'any ClampedProtocol' has no member 'wrappedValue'init(wrappedValue: Value, _ range: ClosedRange<Value>) { // invalid redeclaration of 'init(wrappedValue:_:)'var startIndex: Index { return range.startIndex } // property 'startIndex' requires that 'Value.Stride' conform to 'SignedInteger'var startIndex: Index { return range.startIndex } // property 'startIndex' requires that 'Value' conform to 'Strideable'var startIndex: Index { return range.startIndex } // cannot convert return expression of type 'ClosedRange<Value>.Index' to return type 'Clamped<Value>.Index' (aka 'Int')var endIndex: Index { return range.endIndex } // property 'endIndex' requires that 'Value' conform to 'Strideable'var endIndex: Index { return range.endIndex } // cannot convert return expression of type 'ClosedRange<Value>.Index' to return type 'Clamped<Value>.Index' (aka 'Int')var endIndex: Index { return range.endIndex } // property 'endIndex' requires that 'Value.Stride' conform to 'SignedInteger'func index(after i: Index) -> Index { return range.index(after: i) } // cannot convert return expression of type 'ClosedRange<Value>.Index' to return type 'Clamped<Value>.Index' (aka 'Int')func index(after i: Index) -> Index { return range.index(after: i) } // cannot convert value of type 'Clamped<Value>.Index' (aka 'Int') to expected argument type 'ClosedRange<Value>.Index'func index(after i: Index) -> Index { return range.index(after: i) } // referencing instance method 'index(after:)' on 'ClosedRange' requires that 'Value' conform to 'Strideable'func index(before i: Index) -> Index { return range.index(before: i) } // cannot convert return expression of type 'ClosedRange<Value>.Index' to return type 'Clamped<Value>.Index' (aka 'Int')func index(before i: Index) -> Index { return range.index(before: i) } // referencing instance method 'index(before:)' on 'ClosedRange' requires that 'Value' conform to 'Strideable'func index(before i: Index) -> Index { return range.index(before: i) } // cannot convert value of type 'Clamped<Value>.Index' (aka 'Int') to expected argument type 'ClosedRange<Value>.Index'get { return range[position] } // referencing subscript 'subscript(_:)' on 'ClosedRange' requires that 'Value' conform to 'Strideable'get { return range[position] } // cannot convert value of type 'Clamped<Value>.Index' (aka 'Int') to expected argument type 'ClosedRange<Value>.Index'set { self.wrappedValue = range[position] } // cannot convert value of type 'Clamped<Value>.Index' (aka 'Int') to expected argument type 'ClosedRange<Value>.Index'set { self.wrappedValue = range[position] } // referencing subscript 'subscript(_:)' on 'ClosedRange' requires that 'Value' conform to 'Strideable'extension Clamped: ExpressibleByIntegerLiteral { // type 'Clamped<Value>' does not conform to protocol 'ExpressibleByIntegerLiteral'extension Clamped: ExpressibleByFloatLiteral { // type 'Clamped<Value>' does not conform to protocol 'ExpressibleByFloatLiteral'extension Clamped: ExpressibleByStringLiteral { // type 'Clamped<Value>' does not conform to protocol 'ExpressibleByStringLiteral'extension Clamped: ExpressibleByBooleanLiteral { // type 'Clamped<Value>' does not conform to protocol 'ExpressibleByBooleanLiteral'self.init(wrappedValue: nil, range) // 'nil' is not compatible with expected argument type 'Value'extension Clamped: ExpressibleByExtendedGraphemeClusterLiteral { // type 'Clamped<Value>' does not conform to protocol 'ExpressibleByExtendedGraphemeClusterLiteral'extension Clamped: ExpressibleByUnicodeScalarLiteral { // type 'Clamped<Value>' does not conform to protocol 'ExpressibleByUnicodeScalarLiteral'extension Clamped: ExpressibleByBuiltinIntegerLiteral { // cannot find type 'ExpressibleByBuiltinIntegerLiteral' in scopeextension Clamped: ExpressibleByBuiltinFloatLiteral { // cannot find type 'ExpressibleByBuiltinFloatLiteral' in scopeextension Clamped: ExpressibleByBuiltinBooleanLiteral { // cannot find type 'ExpressibleByBuiltinBooleanLiteral' in scopeextension Clamped: ExpressibleByBuiltinNilLiteral { // cannot find type 'ExpressibleByBuiltinNilLiteral' in scopeself.init(wrappedValue: nil, range) // 'nil' is not compatible with expected argument type 'Value'extension Clamped: ExpressibleByBuiltinArrayLiteral { // cannot find type 'ExpressibleByBuiltinArrayLiteral' in scopeextension Clamped: ExpressibleByBuiltinDictionaryLiteral { // cannot find type 'ExpressibleByBuiltinDictionaryLiteral' in scopeextension Clamped: ExpressibleByBuiltinExtendedGraphemeClusterLiteral { // cannot find type 'ExpressibleByBuiltinExtendedGraphemeClusterLiteral' in scopeenum 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 wrappedValue: Value {
didSet {
logger(.set, wrappedValue)
}
}
}
struct LoggedUser {
@Logged<String> var name: String
@Logged<Int> var age: Int
init(name: String, age: Int) {
self.name = name
self.age = age
}
}
func log(_ event: Event, _ value: String) {
print("Logged \(event) \(value)")
}
func log(_ event: Event, _ value: Int) {
print("Logged \(event) \(value)")
}```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 wrappedValue: Value {
didSet {
logger(.set, wrappedValue)
}
}
}
// A type that uses the Logged property wrapper.
struct LoggedUser {
@Logged<String> var name: String
@Logged<Int> var age: Int
init(name: String, age: Int) {
self.name = name
self.age = age
}
}
// A function that logs events to the console.
func log(_ event: Event, _ value: String) {
print("Logged \(event) \(value)")
}
func log(_ event: Event, _ value: Int) {
print("Logged \(event) \(value)")
}
let user = LoggedUser(name: "<NAME>", age: 30)
user.name = "<NAME>"
user.age = 31
```struct Logged<Value> : LoggedProtocol { // property wrapper type 'Logged' has multiple non-static properties named 'wrappedValue'var wrappedValue: Value { // invalid redeclaration of 'wrappedValue'logger(.set, wrappedValue) // ambiguous use of 'wrappedValue'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
}
var wrappedValue: Value {
didSet {
logger(.set, wrappedValue)
}
}
}
struct LoggedType {
@Logged<String> var loggedString: String
func log(_ event: Event, _ value: String) {
print("Logged \(event) \(value)")
}
}```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 wrappedValue: Value {
didSet {
logger(.set, wrappedValue)
}
}
}
// A type that uses the Logged property wrapper.
struct LoggedType {
@Logged<String> var loggedString: String
func log(_ event: Event, _ value: String) {
print("Logged \(event) \(value)")
}
}
let loggedType = LoggedType()
// Prints "Logged get Optional("Hello, world!")")"
print(loggedType.loggedString)
// Prints "Logged set Optional("Hello, world!")")"
loggedType.loggedString = "Hello, world!"
```struct Logged<Value> : LoggedProtocol { // property wrapper type 'Logged' has multiple non-static properties named 'wrappedValue'var wrappedValue: Value { // invalid redeclaration of 'wrappedValue'logger(.set, wrappedValue) // ambiguous use of 'wrappedValue'enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<Value> {
var wrappedValue: Value
var logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var wrappedValue: Value {
didSet {
logger(.set, wrappedValue)
}
}
}
struct Person {
@Logged<String> var name: String
@Logged<Int> var age: Int
}```swift
enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value> {
var wrappedValue: Value
var logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var wrappedValue: Value {
didSet {
logger(.set, wrappedValue)
}
}
}
struct Person {
@Logged<String> var name: String
@Logged<Int> var age: Int
}
let logger: (Event, String) -> Void = { event, value in
print("\(event) \(value)")
}
var person = Person(name: "<NAME>", age: 30, logger: logger)
person.name = "<NAME>"
person.age = 31
```struct Logged<Value> { // property wrapper type 'Logged' has multiple non-static properties named 'wrappedValue'var wrappedValue: Value { // invalid redeclaration of 'wrappedValue'logger(.set, wrappedValue) // ambiguous use of 'wrappedValue'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
}
var wrappedValue: Value {
didSet {
logger(.set, wrappedValue)
}
}
}
struct SimpleStruct {
@Logged<String> var loggedString: String
}
class SimpleClass {
@Logged<String> var loggedString: 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 wrappedValue: Value {
didSet {
logger(.set, wrappedValue)
}
}
}
// A simple struct that uses the property wrapper.
struct SimpleStruct {
@Logged<String> var loggedString: String
}
// A simple class that uses the property wrapper.
class SimpleClass {
@Logged<String> var loggedString: String
}
// A simple class that uses the property wrapper.
class SimpleClass {
@Logged<String> var loggedString: String
}
// A simple class that uses the property wrapper.
class SimpleClass {
@Logged<String> var loggedString: String
}
// A simple class that uses the property wrapper.
class SimpleClass {
@Logged<String> var loggedString: String
}
// A simple class that uses the property wrapper.
class SimpleClass {
@Logged<String> var loggedString: String
}
// A simple class that uses the property wrapper.
class SimpleClass {
@Logged<String> var loggedString: String
}
// A simple class that uses the property wrapper.
class SimpleClass {
@Logged<String> var loggedString: String
}
// A simple class that uses the property wrapper.
class SimpleClass {
@Logged<String> var loggedString: String
}
// A simple class that uses the property wrapper.
class SimpleClass {
@Logged<String> var loggedString: String
}
// A simple class that uses the property wrapper.
class SimpleClass {
@Logged<String> var loggedString: String
}
// A simple class that uses the property wrapper.
class SimpleClass {
@Logged<String> var loggedString: String
}
// A simple class that uses the property wrapper.
class SimpleClass {
@Logged<String> var loggedString: String
}
// A simple class that uses the property wrapper.
class SimpleClass {
@Logged<String> var loggedString: String
}
// A simple class that uses the property wrapper.
class SimpleClass {
@Logged<String> var loggedString: String
}
// A simple class that uses the property wrapper.
class SimpleClass {
@Logged<String> var loggedString: String
}
// A simple class that uses the property wrapper.
class SimpleClass {
@Logged<String> var loggedString: String
}
// A simple class that uses the property wrapper.
class SimpleClass {
@Logged<String> var loggedString: String
}
// A simple class that uses the property wrapper.
class SimpleClass {
@Logged<String> var loggedString: String
}
// A simple class that uses the property wrapper.
class SimpleClass {
@Logged<String> var loggedString: String
}
// A simple class that uses the property wrapper.
class SimpleClass {
@Logged<String> var loggedString: String
}
// A simple class that uses the property wrapper.
class SimpleClass {
@Logged<String> var loggedString: String
}
// A simple class that uses the property wrapper.
class SimpleClass {
@Logged<String> var loggedString: String
}
// A simple class that uses the property wrapper.
class SimpleClass {
@Logged<String> var loggedString: String
}
// A simple class that uses the property wrapper.
class SimpleClass {
@Logged<String> var loggedString: String
}
// A simple class that uses the property wrapper.
class SimpleClass {
@Logged<String> var loggedString: String
}
// A simple class that uses the property wrapper.
class SimpleClass {
@Logged<String> var loggedString: String
}
// A simple class that uses the property wrapper.
class SimpleClass {
@Logged<String> var loggedString: String
}
// A simple class that uses the property wrapper.
class SimpleClass {
@Logged<String> var loggedString: String
}
// A simple class that uses the property wrapper.
class SimpleClass {
@Logged<String> var loggedString: String
}
// A simple class that uses the property wrapper.
class SimpleClass {
@Logged<String> var loggedString: String
}
// A simple classstruct Logged<Value> : LoggedProtocol { // property wrapper type 'Logged' has multiple non-static properties named 'wrappedValue'var wrappedValue: Value { // invalid redeclaration of 'wrappedValue'logger(.set, wrappedValue) // ambiguous use of 'wrappedValue'class SimpleClass { // class 'SimpleClass' has no initializersenum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<Value> {
private let logger: (Event, Value) -> Void
private var wrappedValue: Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var wrappedValue: Value {
get {
logger(.get, wrappedValue)
return wrappedValue
}
set {
logger(.set, newValue)
wrappedValue = newValue
}
}
}
struct LoggedInt: LoggedProtocol {
typealias Value = Int
init(wrappedValue: Int, logger: @escaping (Event, Int) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
struct LoggedString: LoggedProtocol {
typealias Value = String
init(wrappedValue: String, logger: @escaping (Event, String) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
struct LoggedArray<Element>: LoggedProtocol {
typealias Value = [Element]
init(wrappedValue: [Element], logger: @escaping (Event, [Element]) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
struct LoggedDictionary<Key, Value>: LoggedProtocol {
typealias Value = [Key: Value]
init(wrappedValue: [Key: Value], logger: @escaping (Event, [Key: Value]) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
struct LoggedSet<Element>: LoggedProtocol {
typealias Value = Set<Element>
init(wrappedValue: Set<Element>, logger: @escaping (Event, Set<Element>) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
struct LoggedEnum<Case>: LoggedProtocol {
typealias Value = Case
init(wrappedValue: Case, logger: @escaping (Event, Case) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
struct LoggedStruct<T>: LoggedProtocol {
typealias Value = T
init(wrappedValue: T, logger: @escaping (Event, T) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
struct LoggedClass<T>: LoggedProtocol {
typealias Value = T
init(wrappedValue: T, logger: @escaping (Event, T) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
struct LoggedOptional<Wrapped>: LoggedProtocol {
typealias Value = Wrapped?
init(wrappedValue: Wrapped?, logger: @escaping (Event, Wrapped?) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
struct LoggedArrayOptional<Element>: LoggedProtocol {
typealias Value = [Element]?
init(wrappedValue: [Element]?, logger: @escaping (Event, [Element]?) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
struct LoggedDictionaryOptional<Key, Value>: LoggedProtocol {
typealias Value = [Key: Value]?
init(wrappedValue: [Key: Value]?, logger: @escaping (Event, [Key: Value]?) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
struct LoggedSetOptional<Element>: LoggedProtocol {
typealias Value = Set<Element>?
init(wrappedValue: Set<Element>?, logger: @escaping (Event, Set<Element>?) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
struct LoggedEnumOptional<Case>: LoggedProtocol {
typealias Value = Case?
init(wrappedValue: Case?, logger: @escaping (Event, Case?) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
struct LoggedStructOptional<T>: LoggedProtocol {
typealias Value = T?
init(wrappedValue: T?, logger: @escaping (Event, T?) -> 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> {
private let logger: (Event, Value) -> Void
private var wrappedValue: Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var wrappedValue: Value {
get {
logger(.get, wrappedValue)
return wrappedValue
}
set {
logger(.set, newValue)
wrappedValue = newValue
}
}
}
struct LoggedInt: LoggedProtocol {
typealias Value = Int
init(wrappedValue: Int, logger: @escaping (Event, Int) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
struct LoggedString: LoggedProtocol {
typealias Value = String
init(wrappedValue: String, logger: @escaping (Event, String) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
struct LoggedArray<Element>: LoggedProtocol {
typealias Value = [Element]
init(wrappedValue: [Element], logger: @escaping (Event, [Element]) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
struct LoggedDictionary<Key, Value>: LoggedProtocol {
typealias Value = [Key: Value]
init(wrappedValue: [Key: Value], logger: @escaping (Event, [Key: Value]) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
struct LoggedSet<Element>: LoggedProtocol {
typealias Value = Set<Element>
init(wrappedValue: Set<Element>, logger: @escaping (Event, Set<Element>) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
struct LoggedEnum<Case>: LoggedProtocol {
typealias Value = Case
init(wrappedValue: Case, logger: @escaping (Event, Case) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
struct LoggedStruct<T>: LoggedProtocol {
typealias Value = T
init(wrappedValue: T, logger: @escaping (Event, T) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
struct LoggedClass<T>: LoggedProtocol {
typealias Value = T
init(wrappedValue: T, logger: @escaping (Event, T) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
struct LoggedOptional<Wrapped>: LoggedProtocol {
typealias Value = Wrapped?
init(wrappedValue: Wrapped?, logger: @escaping (Event, Wrapped?) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
struct LoggedArrayOptional<Element>: LoggedProtocol {
typealias Value = [Element]?
init(wrappedValue: [Element]?, logger: @escaping (Event, [Element]?) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
struct LoggedDictionaryOptional<Key, Value>: LoggedProtocol {
typealias Value = [Key: Value]?
init(wrappedValue: [Key: Value]?, logger: @escaping (Event, [Key: Value]?) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
struct LoggedSetOptional<Element>: LoggedProtocol {
typealias Value = Set<Element>?
init(wrappedValue: Set<Element>?, logger: @escaping (Event, Set<Element>?) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
struct LoggedEnumOptional<Case>: LoggedProtocol {
typealias Value = Case?
init(wrappedValue: Case?, logger: @escaping (Event, Case?) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
struct LoggedStructOptional<T>: LoggedProtocol {
typealias Value = T?
init(wrappedValue: T?, logger: @escaping (Event, T?) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
}
struct LoggedClassOptional<T>: LoggedProtocol {
typealias Value =struct Logged<Value> { // property wrapper type 'Logged' has multiple non-static properties named 'wrappedValue'var wrappedValue: Value { // invalid redeclaration of 'wrappedValue'self.wrappedValue = wrappedValue // value of type 'LoggedInt' has no member 'wrappedValue'self.logger = logger // value of type 'LoggedInt' has no member 'logger'self.wrappedValue = wrappedValue // value of type 'LoggedString' has no member 'wrappedValue'self.logger = logger // value of type 'LoggedString' has no member 'logger'self.wrappedValue = wrappedValue // value of type 'LoggedArray<Element>' has no member 'wrappedValue'self.logger = logger // value of type 'LoggedArray<Element>' has no member 'logger'typealias Value = [Key: Value] // type 'Key' does not conform to protocol 'Hashable'init(wrappedValue: [Key: Value], logger: @escaping (Event, [Key: Value]) -> Void) { // type 'Key' does not conform to protocol 'Hashable'init(wrappedValue: [Key: Value], logger: @escaping (Event, [Key: Value]) -> Void) { // type 'Key' does not conform to protocol 'Hashable'self.wrappedValue = wrappedValue // value of type 'LoggedDictionary<Key, Value>' has no member 'wrappedValue'self.logger = logger // value of type 'LoggedDictionary<Key, Value>' has no member 'logger'struct LoggedSet<Element>: LoggedProtocol { // type 'LoggedSet<Element>' does not conform to protocol 'LoggedProtocol'typealias Value = Set<Element> // type 'Element' does not conform to protocol 'Hashable'init(wrappedValue: Set<Element>, logger: @escaping (Event, Set<Element>) -> Void) { // type 'Element' does not conform to protocol 'Hashable'init(wrappedValue: Set<Element>, logger: @escaping (Event, Set<Element>) -> Void) { // type 'Element' does not conform to protocol 'Hashable'self.wrappedValue = wrappedValue // value of type 'LoggedSet<Element>' has no member 'wrappedValue'self.logger = logger // value of type 'LoggedSet<Element>' has no member 'logger'self.wrappedValue = wrappedValue // value of type 'LoggedEnum<Case>' has no member 'wrappedValue'self.logger = logger // value of type 'LoggedEnum<Case>' has no member 'logger'self.wrappedValue = wrappedValue // value of type 'LoggedStruct<T>' has no member 'wrappedValue'self.logger = logger // value of type 'LoggedStruct<T>' has no member 'logger'self.wrappedValue = wrappedValue // value of type 'LoggedClass<T>' has no member 'wrappedValue'self.logger = logger // value of type 'LoggedClass<T>' has no member 'logger'self.wrappedValue = wrappedValue // value of type 'LoggedOptional<Wrapped>' has no member 'wrappedValue'self.logger = logger // value of type 'LoggedOptional<Wrapped>' has no member 'logger'self.wrappedValue = wrappedValue // value of type 'LoggedArrayOptional<Element>' has no member 'wrappedValue'self.logger = logger // value of type 'LoggedArrayOptional<Element>' has no member 'logger'typealias Value = [Key: Value]? // type 'Key' does not conform to protocol 'Hashable'init(wrappedValue: [Key: Value]?, logger: @escaping (Event, [Key: Value]?) -> Void) { // type 'Key' does not conform to protocol 'Hashable'init(wrappedValue: [Key: Value]?, logger: @escaping (Event, [Key: Value]?) -> Void) { // type 'Key' does not conform to protocol 'Hashable'self.wrappedValue = wrappedValue // value of type 'LoggedDictionaryOptional<Key, Value>' has no member 'wrappedValue'self.logger = logger // value of type 'LoggedDictionaryOptional<Key, Value>' has no member 'logger'struct LoggedSetOptional<Element>: LoggedProtocol { // type 'LoggedSetOptional<Element>' does not conform to protocol 'LoggedProtocol'typealias Value = Set<Element>? // type 'Element' does not conform to protocol 'Hashable'init(wrappedValue: Set<Element>?, logger: @escaping (Event, Set<Element>?) -> Void) { // type 'Element' does not conform to protocol 'Hashable'init(wrappedValue: Set<Element>?, logger: @escaping (Event, Set<Element>?) -> Void) { // type 'Element' does not conform to protocol 'Hashable'self.wrappedValue = wrappedValue // value of type 'LoggedSetOptional<Element>' has no member 'wrappedValue'self.logger = logger // value of type 'LoggedSetOptional<Element>' has no member 'logger'self.wrappedValue = wrappedValue // value of type 'LoggedEnumOptional<Case>' has no member 'wrappedValue'self.logger = logger // value of type 'LoggedEnumOptional<Case>' has no member 'logger'self.wrappedValue = wrappedValue // value of type 'LoggedStructOptional<T>' has no member 'wrappedValue'self.logger = logger // value of type 'LoggedStructOptional<T>' has no member 'logger'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
}
var wrappedValue: Value {
willSet {
logger(.set, newValue)
}
}
}
struct User {
@Logged<String> 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 wrappedValue: Value {
willSet {
logger(.set, newValue)
}
}
}
// Usage:
struct User {
@Logged<String> var name: String
}
let user = User(name: "<NAME>")
user.name = "<NAME>"
// Prints:
// set "<NAME>"
```struct Logged<Value> : LoggedProtocol { // property wrapper type 'Logged' has multiple non-static properties named 'wrappedValue'var wrappedValue: Value { // invalid redeclaration of 'wrappedValue'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
}
var wrappedValue: Value {
willSet {
logger(.set, newValue)
}
}
}
struct LoggedType {
@Logged(logger: { print($0, $1) })
var value: Int
}```swift
enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value> : LoggedProtocol {
var wrappedValue: Value
var logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var wrappedValue: Value {
willSet {
logger(.set, newValue)
}
}
}
// A type that uses the Logged property wrapper.
struct LoggedType {
@Logged(logger: { print($0, $1) })
var value: Int
}
```struct Logged<Value> : LoggedProtocol { // property wrapper type 'Logged' has multiple non-static properties named 'wrappedValue'var wrappedValue: Value { // invalid redeclaration of 'wrappedValue'enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<Value> {
private let logger: (Event, Value) -> Void
private var wrappedValue: Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.logger = logger
self.wrappedValue = wrappedValue
}
var wrappedValue: Value {
willSet {
logger(.set, newValue)
}
}
}
struct LoggedInt: LoggedProtocol {
typealias Value = Int
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.init(wrappedValue: wrappedValue, logger: logger)
}
}
struct LoggedString: LoggedProtocol {
typealias Value = String
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.init(wrappedValue: wrappedValue, logger: logger)
}
}
struct LoggedArray<Value>: LoggedProtocol {
typealias Value = [Value]
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.init(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> {
private let logger: (Event, Value) -> Void
private var wrappedValue: Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.logger = logger
self.wrappedValue = wrappedValue
}
var wrappedValue: Value {
willSet {
logger(.set, newValue)
}
}
}
// A type that conforms to LoggedProtocol.
struct LoggedInt: LoggedProtocol {
typealias Value = Int
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.init(wrappedValue: wrappedValue, logger: logger)
}
}
// A type that conforms to LoggedProtocol.
struct LoggedString: LoggedProtocol {
typealias Value = String
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.init(wrappedValue: wrappedValue, logger: logger)
}
}
// A type that conforms to LoggedProtocol.
struct LoggedArray<Value>: LoggedProtocol {
typealias Value = [Value]
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.init(wrappedValue: wrappedValue, logger: logger)
}
}
```struct Logged<Value> { // property wrapper type 'Logged' has multiple non-static properties named 'wrappedValue'var wrappedValue: Value { // invalid redeclaration of 'wrappedValue'struct LoggedArray<Value>: LoggedProtocol { // type 'LoggedArray<Value>' does not conform to protocol 'LoggedProtocol'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
}
var wrappedValue: Value {
didSet {
logger(.set, wrappedValue)
}
}
}```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 wrappedValue: Value {
didSet {
logger(.set, wrappedValue)
}
}
}
// 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 wrappedValue: Value {
didSet {
logger(.set, wrappedValue)
}
}
}
// 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 wrappedValue: Value {
didSet {
logger(.set, wrappedValue)
}
}
}
// 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 wrappedValue: Value {
didSet {
logger(.set, wrappedValue)
}
}
}
// 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 wrappedValue: Value {
didSet {
logger(.set, wrappedValue)
}
}
}
// 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 wrappedValue: Value {
didSet {
logger(.set, wrappedValue)
}
}
}
// 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 wrappedValue: Value {
didSet {
logger(.set, wrappedValue)
}
}
}
// 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 wrappedValue: Value {
didSet {
logger(.set, wrappedValue)
}
}
}
// 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 wrappedValue: Value {
didSet {
logger(.set, wrappedValue)
}
}
}
// A property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value> : LoggedProtocol {struct Logged<Value> : LoggedProtocol { // property wrapper type 'Logged' has multiple non-static properties named 'wrappedValue'var wrappedValue: Value { // invalid redeclaration of 'wrappedValue'logger(.set, wrappedValue) // ambiguous use of 'wrappedValue'enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<Value> {
var wrappedValue: Value
var logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var wrappedValue: Value {
didSet {
logger(.set, wrappedValue)
}
}
}```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
var logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var wrappedValue: Value {
didSet {
logger(.set, wrappedValue)
}
}
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value> {
var wrappedValue: Value
var logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var wrappedValue: Value {
didSet {
logger(.set, wrappedValue)
}
}
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value> {
var wrappedValue: Value
var logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var wrappedValue: Value {
didSet {
logger(.set, wrappedValue)
}
}
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value> {
var wrappedValue: Value
var logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var wrappedValue: Value {
didSet {
logger(.set, wrappedValue)
}
}
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value> {
var wrappedValue: Value
var logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var wrappedValue: Value {
didSet {
logger(.set, wrappedValue)
}
}
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value> {
var wrappedValue: Value
var logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var wrappedValue: Value {
didSet {
logger(.set, wrappedValue)
}
}
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value> {
var wrappedValue: Value
var logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var wrappedValue: Value {
didSet {
logger(.set, wrappedValue)
}
}
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value> {
var wrappedValue: Value
var logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var wrappedValue: Value {
didSet {
logger(.set, wrappedValue)
}
}
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value> {
var wrappedValue: Value
var logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var wrappedValue: Value {
didSet {
logger(.set, wrappedValue)
}
}
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value> {
var wrappedValue: Value
var logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
struct Logged<Value> { // property wrapper type 'Logged' has multiple non-static properties named 'wrappedValue'var wrappedValue: Value { // invalid redeclaration of 'wrappedValue'logger(.set, wrappedValue) // ambiguous use of 'wrappedValue'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 let searchBar: SearchBar
private let searchResults: SearchResults
private let searchResultsController: SearchResultsController
private let searchResultsControllerDelegate: SearchResultsControllerDelegate
init(provider: WeatherProvider) {
self.provider = provider
self.searchBar = SearchBar()
self.searchResults = SearchResults()
self.searchResultsController = SearchResultsController(searchResults: searchResults)
self.searchResultsControllerDelegate = SearchResultsControllerDelegate(searchResultsController: searchResultsController)
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
searchBar.text += String(character)
return nil
case.keyboardDeleteBackwards:
guard!searchBar.text.isEmpty else { return nil }
searchBar.text.removeLast()
return nil
case.searchButtonPress:
guard!searchBar.text.isEmpty else { return nil }
do {
let forecast = try provider.forecast(for: searchBar.text)
return.success(city: searchBar.text, forecast: forecast)
} catch {
return.failure(city: searchBar.text)
}
}
}
}
class SearchBar {
var text: String = "" {
didSet {
searchResults.results = text.isEmpty? [] : ["London", "Paris", "New York"]
}
}
}
class SearchResults {
var results: [String] = []
}
class SearchResultsController {
private let searchResults: SearchResults
private let searchResultsControllerDelegate: SearchResultsControllerDelegate
init(searchResults: SearchResults) {
self.searchResults = searchResults
self.searchResultsControllerDelegate = SearchResultsControllerDelegate(searchResultsController: self)
}
}
class SearchResultsControllerDelegate {
private let searchResultsController: SearchResultsController
init(searchResultsController: SearchResultsController) {
self.searchResultsController = searchResultsController
}
}
class WeatherProvider: WeatherProvider {
func forecast(for city: String) throws -> String {
return "It's sunny in \(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 let searchBar: SearchBar
private let searchResults: SearchResults
private let searchResultsController: SearchResultsController
private let searchResultsControllerDelegate: SearchResultsControllerDelegate
init(provider: WeatherProvider) {
self.provider = provider
self.searchBar = SearchBar()
self.searchResults = SearchResults()
self.searchResultsController = SearchResultsController(searchResults: searchResults)
self.searchResultsControllerDelegate = SearchResultsControllerDelegate(searchResultsController: searchResultsController)
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
searchBar.text += String(character)
return nil
case.keyboardDeleteBackwards:
guard!searchBar.text.isEmpty else { return nil }
searchBar.text.removeLast()
return nil
case.searchButtonPress:
guard!searchBar.text.isEmpty else { return nil }
do {
let forecast = try provider.forecast(for: searchBar.text)
return.success(city: searchBar.text, forecast: forecast)
} catch {
return.failure(city: searchBar.text)
}
}
}
}
// Search bar.
// Handle user input and search results.
class SearchBar {
var text: String = "" {
didSet {
searchResults.results = text.isEmpty? [] : ["London", "Paris", "New York"]
}
}
}
// Search results.
// Handle search results.
class SearchResults {
var results: [String] = []
}
// Search results controller.
// Handle search results.
class SearchResultsController {
private let searchResults: SearchResults
private let searchResultsControllerDelegate: SearchResultsControllerDelegate
init(searchResults: SearchResults) {
self.searchResults = searchResults
self.searchResultsControllerDelegate = SearchResultsControllerDelegate(searchResultsController: self)
}
}
// Search results controller delegate.
// Handle search results.
class SearchResultsControllerDelegate {
private let searchResultsController: SearchResultsController
init(searchResultsController: SearchResultsController) {
self.searchResultsController = searchResultsController
}
}
// Search results controller.
// Handle search results.
class SearchResultsController {
private let searchResults: SearchResults
private let searchResultsControllerDelegate: SearchResultsControllerDelegate
init(searchResults: SearchResults) {
self.searchResults = searchResults
self.searchResultsControllerDelegate = SearchResultsControllerDelegate(searchResultsController: self)
}
}
// Search results controller delegate.
// Handle search results.
class SearchResultsControllerDelegate {
private let searchResultsController: SearchResultsController
init(searchResultsController: SearchResultsController) {
self.searchResultsController = searchResultsController
}
}
// Weather provider.
// Handle weather forecast.
class WeatherProvider: WeatherProvider {
func forecast(for city: String) throws -> String {
return "It's sunny in \(city)"
}
}
```init(provider: WeatherProvider) // 'WeatherProvider' is ambiguous for type lookup in this contextprivate let provider: WeatherProvider // 'WeatherProvider' is ambiguous for type lookup in this contextinit(provider: WeatherProvider) { // 'WeatherProvider' is ambiguous for type lookup in this contextguard!searchBar.text.isEmpty else { return nil } // expected expression, var, let or case in 'guard' conditionguard!searchBar.text.isEmpty else { return nil } // expected expression, var, let or case in 'guard' conditionsearchResults.results = text.isEmpty? [] : ["London", "Paris", "New York"] // value of type 'Bool' has no subscriptssearchResults.results = text.isEmpty? [] : ["London", "Paris", "New York"] // value of optional type 'Optional<_>' must be unwrapped to a value of type '_'searchResults.results = text.isEmpty? [] : ["London", "Paris", "New York"] // cannot find 'searchResults' in scopesearchResults.results = text.isEmpty? [] : ["London", "Paris", "New York"] // consecutive statements on a line must be separated by ';'searchResults.results = text.isEmpty? [] : ["London", "Paris", "New York"] // cannot use optional chaining on non-optional value of type 'Bool'searchResults.results = text.isEmpty? [] : ["London", "Paris", "New York"] // expected expressionclass WeatherProvider: WeatherProvider { // invalid redeclaration of 'WeatherProvider'class WeatherProvider: WeatherProvider { // 'WeatherProvider' is ambiguous for type lookup in this contextstruct WeatherProviderImplementation: WeatherProvider { // 'WeatherProvider' is ambiguous for type lookup in this contextXCTAssertNil(application.handle(action: .keyboardCharacterSelect("K"))) // cannot infer contextual base in reference to member 'keyboardCharacterSelect'XCTAssertNil(application.handle(action: .keyboardCharacterSelect("y"))) // cannot infer contextual base in reference to member 'keyboardCharacterSelect'XCTAssertNil(application.handle(action: .keyboardCharacterSelect("i"))) // cannot infer contextual base in reference to member 'keyboardCharacterSelect'XCTAssertNil(application.handle(action: .keyboardCharacterSelect("v"))) // cannot infer contextual base in reference to member 'keyboardCharacterSelect'XCTAssertEqual(application.handle(action: .searchButtonPress), .success(city: "Kyiv", forecast: "+28")) // type 'Equatable' has no member 'success'XCTAssertEqual(application.handle(action: .searchButtonPress), .success(city: "Kyiv", forecast: "+28")) // cannot infer contextual base in reference to member 'searchButtonPress'(0..<4).forEach { _ in _ = application.handle(action: .keyboardDeleteBackwards) } // Clear search input // cannot infer contextual base in reference to member 'keyboardDeleteBackwards'XCTAssertNil(application.handle(action: .keyboardCharacterSelect("W"))) // cannot infer contextual base in reference to member 'keyboardCharacterSelect'XCTAssertNil(application.handle(action: .keyboardCharacterSelect("s"))) // cannot infer contextual base in reference to member 'keyboardCharacterSelect'XCTAssertNil(application.handle(action: .keyboardCharacterSelect("a"))) // cannot infer contextual base in reference to member 'keyboardCharacterSelect'XCTAssertNil(application.handle(action: .keyboardCharacterSelect("w"))) // cannot infer contextual base in reference to member 'keyboardCharacterSelect'XCTAssertEqual(application.handle(action: .searchButtonPress), .failure(city: "Wsaw")) // type 'Equatable' has no member 'failure'XCTAssertEqual(application.handle(action: .searchButtonPress), .failure(city: "Wsaw")) // cannot infer contextual base in reference to member 'searchButtonPress'protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
return nil
case.keyboardDeleteBackwards:
return nil
case.searchButtonPress:
return nil
}
}
}```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):
return nil
case.keyboardDeleteBackwards:
return nil
case.searchButtonPress:
return nil
}
}
}
```init(provider: WeatherProvider) { // initializer requirement 'init(provider:)' can only be satisfied by a 'required' initializer in non-final class 'WeatherApplication'case.keyboardCharacterSelect(let character): // immutable value 'character' was never used; consider replacing with '_' or removing itprotocol 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 searchBarResults: [String] = []
private var searchBarResultsIndex = 0
private var searchBarResultsCount = 0
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
return handle(character: character)
case.keyboardDeleteBackwards:
return handle(deleteBackwards: ())
case.searchButtonPress:
return handle(searchButtonPress: ())
}
}
private func handle(character: Character) -> ApplicationFeedback? {
searchBarResults.append(String(character))
searchBarResultsCount += 1
return nil
}
private func handle(deleteBackwards: ()) -> ApplicationFeedback? {
guard searchBarResultsCount > 0 else { return nil }
searchBarResults.removeLast()
searchBarResultsCount -= 1
return nil
}
private func handle(searchButtonPress: ()) -> ApplicationFeedback? {
guard searchBarResultsCount > 0 else { return nil }
let city = searchBarResults.joined()
return try? provider.forecast(for: city).map { ApplicationFeedback.success(city: city, forecast: $0) }?? ApplicationFeedback.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
private var searchBarResults: [String] = []
private var searchBarResultsIndex = 0
private var searchBarResultsCount = 0
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
return handle(character: character)
case.keyboardDeleteBackwards:
return handle(deleteBackwards: ())
case.searchButtonPress:
return handle(searchButtonPress: ())
}
}
private func handle(character: Character) -> ApplicationFeedback? {
searchBarResults.append(String(character))
searchBarResultsCount += 1
return nil
}
private func handle(deleteBackwards: ()) -> ApplicationFeedback? {
guard searchBarResultsCount > 0 else { return nil }
searchBarResults.removeLast()
searchBarResultsCount -= 1
return nil
}
private func handle(searchButtonPress: ()) -> ApplicationFeedback? {
guard searchBarResultsCount > 0 else { return nil }
let city = searchBarResults.joined()
return try? provider.forecast(for: city).map { ApplicationFeedback.success(city: city, forecast: $0) }?? ApplicationFeedback.failure(city: city)
}
}
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
private var searchBarResults: [String] = []
private var searchBarResultsIndex = 0
private var searchBarResultsCount = 0
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
return handle(character: character)
case.keyboardDeleteBackwards:
return handle(deleteBackwards: ())
case.searchButtonPress:
return handle(searchButtonPress: ())
}
}
private func handle(character: Character) -> ApplicationFeedback? {
searchBarResults.append(String(character))
searchBarResultsCount += 1
return nil
}
private func handle(deleteBackwards: ()) -> ApplicationFeedback? {
guard searchBarResultsCount > 0 else { return nil }
searchBarResults.removeLast()
searchBarResultsCount -= 1
return nil
}
private func handle(searchButtonPress: ()) -> ApplicationFeedback? {
guard searchBarResultsCount > 0 else { return nil }
let city = searchBarResults.joined()
return try? provider.forecast(for: city).map { ApplicationFeedback.success(city: city, forecast: $0) }?? ApplicationFeedback.failure(city: city)
}
}
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
private var searchBarResults: [String] = []
private var searchBarResultsIndex = 0
private var searchBarResultsCount = 0
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
return handle(character: character)
case.keyboardDeleteBackwards:
return handle(deleteBackwards: ())
case.searchButtonPress:
return handle(searchButtonPress: ())
}
}
private func handle(character: Character) -> ApplicationFeedback? {
searchBarResults.append(String(character))
searchBarResultsCount += 1
return nil
}
private func handle(deleteBackwards: ()) -> ApplicationFeedback? {
guard searchBarResultsCount > 0 else { return nil }
searchBarResults.removeLast()
searchBarResultsCount -= 1
return nil
}
private func handle(searchButtonPress: ()) -> ApplicationFeedback? {
guard searchBarResultsCount > 0 else { return nil }
let city = searchBarResults.joined()
return try? provider.forecast(for: city).map { ApplicationFeedback.success(city: city, forecast: $0) }?? ApplicationFeedback.failure(city: city)
}
}
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
private var searchBarResults: [String] = []
privatereturn try? provider.forecast(for: city).map { ApplicationFeedback.success(city: city, forecast: $0) }?? ApplicationFeedback.failure(city: city) // cannot use optional chaining on non-optional value of type '[_]'return try? provider.forecast(for: city).map { ApplicationFeedback.success(city: city, forecast: $0) }?? ApplicationFeedback.failure(city: city) // cannot use optional chaining on non-optional value of type '[_]'return try? provider.forecast(for: city).map { ApplicationFeedback.success(city: city, forecast: $0) }?? ApplicationFeedback.failure(city: city) // cannot convert value of type 'String.Element' (aka 'Character') to expected argument type 'String'return try? provider.forecast(for: city).map { ApplicationFeedback.success(city: city, forecast: $0) }?? ApplicationFeedback.failure(city: city) // result of call to function returning 'ApplicationFeedback' is unusedreturn try? provider.forecast(for: city).map { ApplicationFeedback.success(city: city, forecast: $0) }?? ApplicationFeedback.failure(city: city) // consecutive statements on a line must be separated by ';'return try? provider.forecast(for: city).map { ApplicationFeedback.success(city: city, forecast: $0) }?? ApplicationFeedback.failure(city: city) // cannot convert value of type '[ApplicationFeedback]?' to specified type 'ApplicationFeedback?'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 {
let provider: WeatherProvider
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
return nil
case.keyboardDeleteBackwards:
return nil
case.searchButtonPress:
return nil
}
}
}```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 {
let provider: WeatherProvider
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
return nil
case.keyboardDeleteBackwards:
return nil
case.searchButtonPress:
return nil
}
}
}
```case.keyboardCharacterSelect(let character): // immutable value 'character' was never used; consider replacing with '_' or removing it // XCTAssertEqual failed: (nil) is not equal to (Optional(Solution.ApplicationFeedback.success(city: "Kyiv", forecast: "+28")))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):
return nil
case.keyboardDeleteBackwards:
return nil
case.searchButtonPress:
return nil
}
}
}
class WeatherApplicationDependenciesImpl: WeatherApplicationDependencies {
private let provider: WeatherProvider
init(provider: WeatherProvider) {
self.provider = provider
}
}
class WeatherApplicationInteractionsImpl: WeatherApplicationInteractions {
private let dependencies: WeatherApplicationDependencies
init(dependencies: WeatherApplicationDependencies) {
self.dependencies = dependencies
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
return nil
case.keyboardDeleteBackwards:
return nil
case.searchButtonPress:
return nil
}
}
}
class WeatherApplicationImpl: WeatherApplication {
private let dependencies: WeatherApplicationDependencies
init(dependencies: WeatherApplicationDependencies) {
self.dependencies = dependencies
}
}```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):
return nil
case.keyboardDeleteBackwards:
return nil
case.searchButtonPress:
return nil
}
}
}
// Weather application dependencies.
// Provide WeatherProvider to WeatherApplication.
class WeatherApplicationDependenciesImpl: WeatherApplicationDependencies {
private let provider: WeatherProvider
init(provider: WeatherProvider) {
self.provider = provider
}
}
// Weather application interactions.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplicationInteractionsImpl: WeatherApplicationInteractions {
private let dependencies: WeatherApplicationDependencies
init(dependencies: WeatherApplicationDependencies) {
self.dependencies = dependencies
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
return nil
case.keyboardDeleteBackwards:
return nil
case.searchButtonPress:
return nil
}
}
}
// Weather application.
// Provide WeatherProvider to WeatherApplication.
class WeatherApplicationImpl: WeatherApplication {
private let dependencies: WeatherApplicationDependencies
init(dependencies: WeatherApplicationDependencies) {
self.dependencies = dependencies
}
}
// Weather application interactions.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplicationInteractionsImpl: WeatherApplicationInteractions {
private let dependencies: WeatherApplicationDependencies
init(dependencies: WeatherApplicationDependencies) {
self.dependencies = dependencies
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
return nil
case.keyboardDeleteBackwards:
return nil
case.searchButtonPress:
return nil
}
}
}
```init(provider: WeatherProvider) { // initializer requirement 'init(provider:)' can only be satisfied by a 'required' initializer in non-final class 'WeatherApplication'case.keyboardCharacterSelect(let character): // immutable value 'character' was never used; consider replacing with '_' or removing itinit(provider: WeatherProvider) { // initializer requirement 'init(provider:)' can only be satisfied by a 'required' initializer in non-final class 'WeatherApplicationDependenciesImpl'case.keyboardCharacterSelect(let character): // immutable value 'character' was never used; consider replacing with '_' or removing itprotocol 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 let searchBar: SearchBar
private let forecastLabel: UILabel
required init(provider: WeatherProvider) {
self.provider = provider
self.searchBar = SearchBar()
self.forecastLabel = UILabel()
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
return nil
case.keyboardDeleteBackwards:
return nil
case.searchButtonPress:
return nil
}
}
}```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 let searchBar: SearchBar
private let forecastLabel: UILabel
required init(provider: WeatherProvider) {
self.provider = provider
self.searchBar = SearchBar()
self.forecastLabel = UILabel()
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
return nil
case.keyboardDeleteBackwards:
return nil
case.searchButtonPress:
return nil
}
}
}
```private let searchBar: SearchBar // cannot find type 'SearchBar' in scopeprivate let forecastLabel: UILabel // cannot find type 'UILabel' in scopeself.searchBar = SearchBar() // cannot find 'SearchBar' in scopeself.forecastLabel = UILabel() // cannot find 'UILabel' in scopecase.keyboardCharacterSelect(let character): // immutable value 'character' was never used; consider replacing with '_' or removing itprotocol 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):
return nil
case.keyboardDeleteBackwards:
return nil
case.searchButtonPress:
return nil
}
}
}```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):
return nil
case.keyboardDeleteBackwards:
return nil
case.searchButtonPress:
return nil
}
}
}
// 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):
return nil
case.keyboardDeleteBackwards:
return nil
case.searchButtonPress:
return nil
}
}
}
// 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):
return nil
case.keyboardDeleteBackwards:
return nil
case.searchButtonPress:
return nil
}
}
}
// 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):
return nil
case.keyboardDeleteBackwards:
return nil
case.searchButtonPress:
return nil
}
}
}
// 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):
return nil
case.keyboardDeleteBackwards:
return nil
case.searchButtonPress:
return nil
}
}
}
// 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):
return nil
case.keyboardDeleteBackwards:
return nil
case.searchButtonPress:
return nil
}
}
}
// 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):
return nil
case.keyboardDeleteBackwards:
return nil
case.searchButtonPress:
return nil
}
}
}
// 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):
return nil
case.keyboardDeleteBackwards:
return nil
case.searchButtonPress:
return nil
}
}
}
// 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):
return nil
case.keyboardDeleteBackwards:
return nil
case.searchButtonPress:
return nil
}
}
}
// Weather application provider.
// Handle user actions toinit(provider: WeatherProvider) { // initializer requirement 'init(provider:)' can only be satisfied by a 'required' initializer in non-final class 'WeatherApplication'case.keyboardCharacterSelect(let character): // immutable value 'character' was never used; consider replacing with '_' or removing itprotocol 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 searchBarResults = [String]()
private var searchBarResultsIndex = 0
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
searchBarResults.append(String(character))
return nil
case.keyboardDeleteBackwards:
guard searchBarResults.count > 0 else { return nil }
searchBarResults.removeLast()
return nil
case.searchButtonPress:
guard searchBarResults.count > 0 else { return nil }
let city = searchBarResults.joined(separator: " ")
return ApplicationFeedback.success(city: city, forecast: try! provider.forecast(for: city))
}
}
}```swift
protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
private var searchBarResults = [String]()
private var searchBarResultsIndex = 0
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
searchBarResults.append(String(character))
return nil
case.keyboardDeleteBackwards:
guard searchBarResults.count > 0 else { return nil }
searchBarResults.removeLast()
return nil
case.searchButtonPress:
guard searchBarResults.count > 0 else { return nil }
let city = searchBarResults.joined(separator: " ")
return ApplicationFeedback.success(city: city, forecast: try! provider.forecast(for: city))
}
}
}
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
private var searchBarResults = [String]()
private var searchBarResultsIndex = 0
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
searchBarResults.append(String(character))
return nil
case.keyboardDeleteBackwards:
guard searchBarResults.count > 0 else { return nil }
searchBarResults.removeLast()
return nil
case.searchButtonPress:
guard searchBarResults.count > 0 else { return nil }
let city = searchBarResults.joined(separator: " ")
return ApplicationFeedback.success(city: city, forecast: try! provider.forecast(for: city))
}
}
}
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
private var searchBarResults = [String]()
private var searchBarResultsIndex = 0
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
searchBarResults.append(String(character))
return nil
case.keyboardDeleteBackwards:
guard searchBarResults.count > 0 else { return nil }
searchBarResults.removeLast()
return nil
case.searchButtonPress:
guard searchBarResults.count > 0 else { return nil }
let city = searchBarResults.joined(separator: " ")
return ApplicationFeedback.success(city: city, forecast: try! provider.forecast(for: city))
}
}
}
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
private var searchBarResults = [String]()
private var searchBarResultsIndex = 0
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
searchBarResults.append(String(character))
return nil
case.keyboardDeleteBackwards:
guard searchBarResults.count > 0 else { return nil }
searchBarResults.removeLast()
return nil
case.searchButtonPress:
guard searchBarResults.count > 0 else { return nil }
let city = searchBarResults.joined(separator: " ")
return ApplicationFeedback.success(city: city, forecast: try! provider.forecast(for: city))
}
}
}
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
private var searchBarResults = [String]()
private var searchBarResultsIndex = 0
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
searchBarResults.append(String(character))
return nil
case.keyboardDeleteBackwards:
guard searchBarResults.count > 0 else { return nil }
searchBarResults.removeLast()
return nil
case.searchButtonPress:
guard searchBarResults.count > 0 else { return nil } // Fatal error: 'try!' expression unexpectedly raised an error: Solution.(unknown context at $102cb7cb0).(unknown context at $102cb7cb8).WeatherProviderError.notFound(city: "K y i v")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 {
let provider: WeatherProvider
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
return nil
case.keyboardDeleteBackwards:
return nil
case.searchButtonPress:
return nil
}
}
}```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 {
let provider: WeatherProvider
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
return nil
case.keyboardDeleteBackwards:
return nil
case.searchButtonPress:
return nil
}
}
}
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
let provider: WeatherProvider
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
return nil
case.keyboardDeleteBackwards:
return nil
case.searchButtonPress:
return nil
}
}
}
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
let provider: WeatherProvider
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
return nil
case.keyboardDeleteBackwards:
return nil
case.searchButtonPress:
return nil
}
}
}
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
let provider: WeatherProvider
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
return nil
case.keyboardDeleteBackwards:
return nil
case.searchButtonPress:
return nil
}
}
}
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
let provider: WeatherProvider
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
return nil
case.keyboardDeleteBackwards:
return nil
case.searchButtonPress:
return nil
}
}
}
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
let provider: WeatherProvider
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
return nil
case.keyboardDeleteBackwards:
return nil
case.searchButtonPress:
return nil
}
}
}
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
let provider: WeatherProvider
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
return nil
case.keyboardDeleteBackwards:
return nil
case.searchButtonPress:
return nil
}
}
}
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
let provider: WeatherProvider
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
return nil
case.keyboardDeleteBackwards:
return nil
case.searchButtonPress:
return nil
}
}
}
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
let provider: WeatherProvider
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
return nil
case.keyboardDeleteBackwards:
return nil
case.searchButtonPress:
return nil
}
}
}
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider toinit(provider: WeatherProvider) { // initializer requirement 'init(provider:)' can only be satisfied by a 'required' initializer in non-final class 'WeatherApplication'case.keyboardCharacterSelect(let character): // immutable value 'character' was never used; consider replacing with '_' or removing itprotocol 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):
return nil
case.keyboardDeleteBackwards:
return nil
case.searchButtonPress:
return nil
}
}
}```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):
return nil
case.keyboardDeleteBackwards:
return nil
case.searchButtonPress:
return nil
}
}
}
```init(provider: WeatherProvider) { // initializer requirement 'init(provider:)' can only be satisfied by a 'required' initializer in non-final class 'WeatherApplication'case.keyboardCharacterSelect(let character): // immutable value 'character' was never used; consider replacing with '_' or removing it