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 {
let json = try JSONSerialization.jsonObject(with: data)
guard let result = json as? JSON else {
throw ParsingError.internalError(JSONSerializationError.typeMismatch)
}
return result
} catch {
throw ParsingError.internalError(error)
}
}```swift
typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
// JSON parser, returns custom error type in case of failures.
func parse(string: String) throws -> JSON {
guard let data = string.data(using:.utf8) else {
throw ParsingError.invalidInput
}
do {
let json = try JSONSerialization.jsonObject(with: data)
guard let result = json as? JSON else {
throw ParsingError.internalError(JSONSerializationError.typeMismatch)
}
return result
} catch {
throw ParsingError.internalError(error)
}
}
```throw ParsingError.internalError(JSONSerializationError.typeMismatch) // cannot find 'JSONSerializationError' in scopetypealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
func parse(string: String) throws -> JSON {
guard let data = string.data(using:.utf8) else {
throw ParsingError.invalidInput
}
do {
let json = try JSONSerialization.jsonObject(with: data, options: []) as? JSON
return json?? [:]
} catch {
throw ParsingError.internalError(error)
}
}
func parse(string: String) throws -> JSON {
guard let data = string.data(using:.utf8) else {
throw NSError(domain: "ParsingError", code: 1, userInfo: nil)
}
do {
let json = try JSONSerialization.jsonObject(with: data, options: []) as? JSON
return json?? [:]
} catch {
throw error
}
}```swift
typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
// JSON parser, returns custom error type in case of failures.
func parse(string: String) throws -> JSON {
guard let data = string.data(using:.utf8) else {
throw ParsingError.invalidInput
}
do {
let json = try JSONSerialization.jsonObject(with: data, options: []) as? JSON
return json?? [:]
} catch {
throw ParsingError.internalError(error)
}
}
// JSON parser, returns NSError in case of failures.
func parse(string: String) throws -> JSON {
guard let data = string.data(using:.utf8) else {
throw NSError(domain: "ParsingError", code: 1, userInfo: nil)
}
do {
let json = try JSONSerialization.jsonObject(with: data, options: []) as? JSON
return json?? [:]
} catch {
throw error
}
}
```return json?? [:] // cannot use optional chaining on non-optional value of type 'JSON' (aka 'Dictionary<String, Any>')return json?? [:] // missing argument for parameter #1 in subscriptreturn json?? [:] // expected expression in list of expressionsreturn json?? [:] // cannot convert return expression of type 'Any?' to return type 'JSON' (aka 'Dictionary<String, Any>')func parse(string: String) throws -> JSON { // invalid redeclaration of 'parse(string:)'return json?? [:] // cannot convert return expression of type 'Any?' to return type 'JSON' (aka 'Dictionary<String, Any>')return json?? [:] // cannot use optional chaining on non-optional value of type 'JSON' (aka 'Dictionary<String, Any>')return json?? [:] // missing argument for parameter #1 in subscriptreturn json?? [:] // expected expression in list of expressionstypealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
func parse(string: String) throws -> JSON {
guard let data = string.data(using:.utf8) else {
throw ParsingError.invalidInput
}
do {
let json = try JSONSerialization.jsonObject(with: data, options: []) as? JSON
return json?? [:]
} catch {
throw ParsingError.internalError(error)
}
}```swift
typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
// JSON parser, returns custom error type in case of failures.
func parse(string: String) throws -> JSON {
guard let data = string.data(using:.utf8) else {
throw ParsingError.invalidInput
}
do {
let json = try JSONSerialization.jsonObject(with: data, options: []) as? JSON
return json?? [:]
} catch {
throw ParsingError.internalError(error)
}
}
```return json?? [:] // missing argument for parameter #1 in subscriptreturn json?? [:] // cannot convert return expression of type 'Any?' to return type 'JSON' (aka 'Dictionary<String, Any>')return json?? [:] // cannot use optional chaining on non-optional value of type 'JSON' (aka 'Dictionary<String, Any>')return json?? [:] // expected expression in list of expressionstypealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
func parse(string: String) throws -> JSON {
guard let data = string.data(using:.utf8) else {
throw ParsingError.invalidInput
}
do {
let json = try JSONSerialization.jsonObject(with: data)
return json as! JSON
} catch {
throw ParsingError.internalError(error)
}
}
func parse(string: String) throws -> JSON {
guard let data = string.data(using:.utf8) else {
throw JSONSerialization.Error.invalidInput
}
do {
let json = try JSONSerialization.jsonObject(with: data)
return json as! JSON
} catch {
throw error
}
}```swift
typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
// JSON parser, returns custom error type in case of failures.
func parse(string: String) throws -> JSON {
guard let data = string.data(using:.utf8) else {
throw ParsingError.invalidInput
}
do {
let json = try JSONSerialization.jsonObject(with: data)
return json as! JSON
} catch {
throw ParsingError.internalError(error)
}
}
// JSON parser, returns Swift error type in case of failures.
func parse(string: String) throws -> JSON {
guard let data = string.data(using:.utf8) else {
throw JSONSerialization.Error.invalidInput
}
do {
let json = try JSONSerialization.jsonObject(with: data)
return json as! JSON
} catch {
throw error
}
}
```func parse(string: String) throws -> JSON { // invalid redeclaration of 'parse(string:)'throw JSONSerialization.Error.invalidInput // type 'JSONSerialization' has no member 'Error'typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
func parse(string: String) throws -> JSON {
guard let data = string.data(using:.utf8) else {
throw ParsingError.invalidInput
}
do {
let json = try JSONSerialization.jsonObject(with: data, options: []) as! JSON
return json
} catch {
throw ParsingError.internalError(error)
}
}```swift
typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
// JSON parser, returns custom error type in case of failures.
func parse(string: String) throws -> JSON {
guard let data = string.data(using:.utf8) else {
throw ParsingError.invalidInput
}
do {
let json = try JSONSerialization.jsonObject(with: data, options: []) as! JSON
return json
} catch {
throw ParsingError.internalError(error)
}
}
```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) as! JSON
} catch {
throw ParsingError.internalError(error)
}
}
func parse(string: String) throws -> JSON {
guard let data = string.data(using:.utf8) else {
throw NSError(domain: "ParsingError", code: 1, userInfo: nil)
}
do {
return try JSONSerialization.jsonObject(with: data) as! JSON
} catch {
throw NSError(domain: "ParsingError", code: 2, userInfo: nil)
}
}```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) as! JSON
} catch {
throw ParsingError.internalError(error)
}
}
// JSON parser, returns NSError in case of failures.
func parse(string: String) throws -> JSON {
guard let data = string.data(using:.utf8) else {
throw NSError(domain: "ParsingError", code: 1, userInfo: nil)
}
do {
return try JSONSerialization.jsonObject(with: data) as! JSON
} catch {
throw NSError(domain: "ParsingError", code: 2, userInfo: nil)
}
}
```func parse(string: String) throws -> JSON { // invalid redeclaration of 'parse(string:)'typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
func parse(string: String) throws -> JSON {
guard let data = string.data(using:.utf8) else {
throw ParsingError.invalidInput
}
do {
let json = try JSONSerialization.jsonObject(with: data, options: [])
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)
}
}
```return json as? JSON?? [:] // expected ']' in array typereturn json as? JSON?? [:] // expected expressionreturn json as? JSON?? [:] // consecutive statements on a line must be separated by ';'return json as? JSON?? [:] // value of optional type 'JSON???' (aka 'Optional<Optional<Optional<Dictionary<String, Any>>>>') must be unwrapped to a value of type 'JSON??' (aka 'Optional<Optional<Dictionary<String, Any>>>')typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
func parse(string: String) throws -> JSON {
guard let data = string.data(using:.utf8) else {
throw ParsingError.invalidInput
}
do {
return try JSONSerialization.jsonObject(with: data) as! JSON
} catch {
throw ParsingError.internalError(error)
}
}
func parse(string: String) throws -> JSON {
guard let data = string.data(using:.utf8) else {
throw NSError(domain: "com.example.parsing", code: 1, userInfo: nil)
}
do {
return try JSONSerialization.jsonObject(with: data) as! JSON
} catch {
throw error
}
}```swift
typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
// JSON parser, returns custom error type in case of failures.
func parse(string: String) throws -> JSON {
guard let data = string.data(using:.utf8) else {
throw ParsingError.invalidInput
}
do {
return try JSONSerialization.jsonObject(with: data) as! JSON
} catch {
throw ParsingError.internalError(error)
}
}
// JSON parser, returns NSError in case of failures.
func parse(string: String) throws -> JSON {
guard let data = string.data(using:.utf8) else {
throw NSError(domain: "com.example.parsing", code: 1, userInfo: nil)
}
do {
return try JSONSerialization.jsonObject(with: data) as! JSON
} catch {
throw error
}
}
```func parse(string: String) throws -> JSON { // invalid redeclaration of 'parse(string:)'typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
func parse(string: String) throws -> JSON {
guard let data = string.data(using:.utf8) else {
throw ParsingError.invalidInput
}
do {
let json = try JSONSerialization.jsonObject(with: data, options: [])
guard let result = json as? JSON else {
throw ParsingError.invalidInput
}
return result
} catch {
throw ParsingError.internalError(error)
}
}```swift
typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
// JSON parser, returns custom error type in case of failures.
func parse(string: String) throws -> JSON {
guard let data = string.data(using:.utf8) else {
throw ParsingError.invalidInput
}
do {
let json = try JSONSerialization.jsonObject(with: data, options: [])
guard let result = json as? JSON else {
throw ParsingError.invalidInput
}
return result
} catch {
throw ParsingError.internalError(error)
}
}
```typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
func parse(string: String) throws -> JSON {
guard let data = string.data(using:.utf8) else {
throw ParsingError.invalidInput
}
do {
let json = try JSONSerialization.jsonObject(with: data)
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)
return json as! JSON
} catch {
throw ParsingError.internalError(error)
}
}
```indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
func generate(_ tree: HTMLNode) -> String {
switch tree {
case.text(let content):
return content
case.element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}```swift
indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case.text(let content):
return content
case.element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
let tree: HTMLNode =.element("div", children: [
.element("a", attributes: ["href": "swifteval"], children: [
.text("SwiftEval")
])
])
print(generate(tree))
```indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
func generate(_ tree: HTMLNode) -> String {
switch tree {
case.text(let content):
return content
case.element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childrenString = children.map(generate).joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}```swift
indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case.text(let content):
return content
case.element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childrenString = children.map(generate).joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
let tree: HTMLNode =.element("div", children: [
.element("a", attributes: ["href": "swifteval"], children: [
.text("SwiftEval")
])
])
print(generate(tree))
```indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
func generate(_ tree: HTMLNode) -> String {
switch tree {
case.text(let content):
return content
case.element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
return "<\(name) \(attributesString)>" + children.map(generate).joined(separator: "") + "</\(name)>"
}
}```swift
indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case.text(let content):
return content
case.element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
return "<\(name) \(attributesString)>" + children.map(generate).joined(separator: "") + "</\(name)>"
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case.text(let content):
return content
case.element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
return "<\(name) \(attributesString)>" + children.map(generate).joined(separator: "") + "</\(name)>"
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case.text(let content):
return content
case.element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
return "<\(name) \(attributesString)>" + children.map(generate).joined(separator: "") + "</\(name)>"
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case.text(let content):
return content
case.element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
return "<\(name) \(attributesString)>" + children.map(generate).joined(separator: "") + "</\(name)>"
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case.text(let content):
return content
case.element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
return "<\(name) \(attributesString)>" + children.map(generate).joined(separator: "") + "</\(name)>"
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case.text(let content):
return content
case.element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
return "<\(name) \(attributesString)>" + children.map(generate).joined(separator: "") + "</\(name)>"
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case.text(let content):
return content
case.element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
return "<\(name) \(attributesString)>" + children.map(generate).joined(separator: "") + "</\(name)>"
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case.text(let content):
return content
case.element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator:indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
func generate(_ tree: HTMLNode) -> String {
switch tree {
case.text(let content):
return content
case.element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}```swift
indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case.text(let content):
return content
case.element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case.text(let content):
return content
case.element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case.text(let content):
return content
case.element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case.text(let content):
return content
case.element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case.text(let content):
return content
case.element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case.text(let content):
return content
case.element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case.text(let content):
return content
case.element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree:indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
func generate(_ tree: HTMLNode) -> String {
switch tree {
case.text(let content):
return content
case.element(let name, let attributes, let children):
let attributes = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
return "<\(name) \(attributes)>\(children.map { generate($0) }.joined())</\(name)>"
}
}```swift
indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case.text(let content):
return content
case.element(let name, let attributes, let children):
let attributes = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
return "<\(name) \(attributes)>\(children.map { generate($0) }.joined())</\(name)>"
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case.text(let content):
return content
case.element(let name, let attributes, let children):
let attributes = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
return "<\(name) \(attributes)>\(children.map { generate($0) }.joined())</\(name)>"
}
}
let tree: HTMLNode =.element("div", children: [
.element("a", attributes: ["href": "swifteval"], children: [
.text("SwiftEval")
])
])
print(generate(tree))
```indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
func generate(_ tree: HTMLNode) -> String {
switch tree {
case.text(let content):
return content
case.element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}```swift
indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case.text(let content):
return content
case.element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case.text(let content):
return content
case.element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case.text(let content):
return content
case.element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case.text(let content):
return content
case.element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case.text(let content):
return content
case.element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case.text(let content):
return content
case.element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case.text(let content):
return content
case.element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree:indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
func generate(_ tree: HTMLNode) -> String {
switch tree {
case.text(let content):
return content
case.element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}```swift
indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case.text(let content):
return content
case.element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case.text(let content):
return content
case.element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case.text(let content):
return content
case.element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case.text(let content):
return content
case.element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case.text(let content):
return content
case.element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case.text(let content):
return content
case.element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case.text(let content):
return content
case.element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree:indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
func generate(_ tree: HTMLNode) -> String {
switch tree {
case.text(let content):
return content
case.element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childrenString = children.map(generate).joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}```swift
indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case.text(let content):
return content
case.element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childrenString = children.map(generate).joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case.text(let content):
return content
case.element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childrenString = children.map(generate).joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case.text(let content):
return content
case.element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childrenString = children.map(generate).joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case.text(let content):
return content
case.element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childrenString = children.map(generate).joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case.text(let content):
return content
case.element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childrenString = children.map(generate).joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case.text(let content):
return content
case.element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childrenString = children.map(generate).joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case.text(let content):
return content
case.element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childrenString = children.map(generate).joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case.text(let content):
return content
case.element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0)=\"\($1)\"" }.joined(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 attributesString = ""
for (key, value) in attributes {
attributesString += " \(key)=\"\(value)\""
}
return "<\(name)\(attributesString)>" + children.map(generate).joined() + "</\(name)>"
}
}```swift
indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case.text(let content):
return content
case.element(let name, let attributes, let children):
var attributesString = ""
for (key, value) in attributes {
attributesString += " \(key)=\"\(value)\""
}
return "<\(name)\(attributesString)>" + children.map(generate).joined() + "</\(name)>"
}
}
let tree: HTMLNode =.element("div", children: [
.element("a", attributes: ["href": "swifteval"], children: [
.text("SwiftEval")
])
])
print(generate(tree))
```indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
func generate(_ tree: HTMLNode) -> String {
switch tree {
case.text(let content):
return content
case.element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}```swift
indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case.text(let content):
return content
case.element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0.key)=\"\($0.value)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<\(name) \(attributesString)>\(childrenString)</\(name)>"
}
}
let tree: HTMLNode =.element("div", children: [
.element("a", attributes: ["href": "swifteval"], children: [
.text("SwiftEval")
])
])
print(generate(tree))
```enum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
let tokens = string.split(separator: " ").map(String.init)
var stack = [Double]()
var i = 0
while i < tokens.count {
let token = tokens[i]
switch token {
case "+":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a + b)
case "-":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a - b)
case "*":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a * b)
case "/":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a / b)
case "(":
i += 1
let result = try calculate(String(tokens[i...]))
i += result.tokensConsumed
stack.append(result.value)
case ")":
break
default:
guard let value = Double(token) else { throw CalculateError.invalidInput }
stack.append(value)
}
i += 1
}
guard stack.count == 1 else { throw CalculateError.invalidInput }
return stack.removeLast()
}
func calculate(_ string: String) throws -> (value: Double, tokensConsumed: Int) {
let tokens = string.split(separator: " ").map(String.init)
var stack = [Double]()
var i = 0
while i < tokens.count {
let token = tokens[i]
switch token {
case "+":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a + b)
case "-":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a - b)
case "*":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a * b)
case "/":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a / b)
case "(":
i += 1
let result = try calculate(String(tokens[i...]))
i += result.tokensConsumed
stack.append(result.value)
case ")":
break
default:
guard let value = Double(token) else { throw CalculateError.invalidInput }
stack.append(value)
}
i += 1
}
guard stack.count == 1 else { throw CalculateError.invalidInput }
return (stack.removeLast(), i)
}```swift
enum CalculateError: Error {
case invalidInput
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
let tokens = string.split(separator: " ").map(String.init)
var stack = [Double]()
var i = 0
while i < tokens.count {
let token = tokens[i]
switch token {
case "+":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a + b)
case "-":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a - b)
case "*":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a * b)
case "/":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a / b)
case "(":
i += 1
let result = try calculate(String(tokens[i...]))
i += result.tokensConsumed
stack.append(result.value)
case ")":
break
default:
guard let value = Double(token) else { throw CalculateError.invalidInput }
stack.append(value)
}
i += 1
}
guard stack.count == 1 else { throw CalculateError.invalidInput }
return stack.removeLast()
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> (value: Double, tokensConsumed: Int) {
let tokens = string.split(separator: " ").map(String.init)
var stack = [Double]()
var i = 0
while i < tokens.count {
let token = tokens[i]
switch token {
case "+":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a + b)
case "-":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a - b)
case "*":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a * b)
case "/":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a / b)
case "(":
i += 1
let result = try calculate(String(tokens[i...]))
i += result.tokensConsumed
stack.append(result.value)
case ")":
break
default:
guard let value = Double(token) else { throw CalculateError.invalidInput }
stack.append(value)
}
i += 1
}
guard stack.count == 1 else { throw CalculateError.invalidInput }
return (stack.removeLast(), i)
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> (value: Double, tokensConsumed: Int) {
let tokens = string.split(separator: " ").map(String.init)
var stack = [Double]()
var i = 0
while i < tokens.count {
let token = tokens[i]
switch token {
case "+":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a + b)
case "-":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a - b)
case "*":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a * b)
case "/":
guard stack.count >= 2 else { throwlet result = try calculate(String(tokens[i...])) // no exact matches in call to initializerlet result = try calculate(String(tokens[i...])) // no exact matches in call to initializerXCTAssertThrowsError(try calculate("A/B")) // ambiguous use of 'calculate'enum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
let tokens = tokenize(string)
let expression = try parse(tokens)
return try evaluate(expression)
}```swift
enum CalculateError: Error {
case invalidInput
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
let tokens = tokenize(string)
let expression = try parse(tokens)
return try evaluate(expression)
}
```let tokens = tokenize(string) // cannot find 'tokenize' in scopelet expression = try parse(tokens) // cannot find 'parse' in scopereturn try evaluate(expression) // cannot find 'evaluate' in scopeenum 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 b = stack.removeLast()
let a = stack.removeLast()
stack.append(a + b)
case "-":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a - b)
case "*":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a * b)
case "/":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a / b)
case "(":
break
case ")":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a + b)
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 b = stack.removeLast()
let a = stack.removeLast()
stack.append(a + b)
case "-":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a - b)
case "*":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a * b)
case "/":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a / b)
case "(":
break
case ")":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a + b)
default:
guard let value = Double(token) else { throw CalculateError.invalidInput }
stack.append(value)
}
}
guard stack.count == 1 else { throw CalculateError.invalidInput }
return stack.removeLast()
}
do {
let result = try calculate("2+2*2")
print(result)
} catch {
print(error)
}
``` // Fatal error: Error raised at top level: Solution.CalculateError.invalidInputenum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
let tokens = string.split(separator: " ")
var stack = [Double]()
for token in tokens {
if let number = Double(token) {
stack.append(number)
} else {
guard stack.count >= 2 else {
throw CalculateError.invalidInput
}
let rhs = stack.removeLast()
let lhs = stack.removeLast()
switch token {
case "+":
stack.append(lhs + rhs)
case "-":
stack.append(lhs - rhs)
case "*":
stack.append(lhs * rhs)
case "/":
stack.append(lhs / rhs)
default:
throw CalculateError.invalidInput
}
}
}
guard stack.count == 1 else {
throw CalculateError.invalidInput
}
return stack.removeLast()
}```swift
enum CalculateError: Error {
case invalidInput
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
let tokens = string.split(separator: " ")
var stack = [Double]()
for token in tokens {
if let number = Double(token) {
stack.append(number)
} else {
guard stack.count >= 2 else {
throw CalculateError.invalidInput
}
let rhs = stack.removeLast()
let lhs = stack.removeLast()
switch token {
case "+":
stack.append(lhs + rhs)
case "-":
stack.append(lhs - rhs)
case "*":
stack.append(lhs * rhs)
case "/":
stack.append(lhs / rhs)
default:
throw CalculateError.invalidInput
}
}
}
guard stack.count == 1 else {
throw CalculateError.invalidInput
}
return stack.removeLast()
}
do {
let result = try calculate("2+2*2")
print(result)
} catch {
print(error)
}
``` // Fatal error: Error raised at top level: Solution.CalculateError.invalidInputenum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
let tokens = string.components(separatedBy: " ")
var stack = [Double]()
for token in tokens {
switch token {
case "+":
guard stack.count >= 2 else {
throw CalculateError.invalidInput
}
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a + b)
case "-":
guard stack.count >= 2 else {
throw CalculateError.invalidInput
}
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a - b)
case "*":
guard stack.count >= 2 else {
throw CalculateError.invalidInput
}
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a * b)
case "/":
guard stack.count >= 2 else {
throw CalculateError.invalidInput
}
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a / b)
case "(":
continue
case ")":
continue
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 b = stack.removeLast()
let a = stack.removeLast()
stack.append(a + b)
case "-":
guard stack.count >= 2 else {
throw CalculateError.invalidInput
}
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a - b)
case "*":
guard stack.count >= 2 else {
throw CalculateError.invalidInput
}
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a * b)
case "/":
guard stack.count >= 2 else {
throw CalculateError.invalidInput
}
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a / b)
case "(":
continue
case ")":
continue
default:
guard let value = Double(token) else {
throw CalculateError.invalidInput
}
stack.append(value)
}
}
guard stack.count == 1 else {
throw CalculateError.invalidInput
}
return stack.removeLast()
}
do {
let result = try calculate("2+2*2")
print(result)
} catch {
print(error)
}
``` // Fatal error: Error raised at top level: Solution.CalculateError.invalidInputenum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
let tokens = string.split(separator: " ").map(String.init)
var stack: [Double] = []
var i = 0
while i < tokens.count {
let token = tokens[i]
switch token {
case "+":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a + b)
case "-":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a - b)
case "*":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a * b)
case "/":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a / b)
case "(":
i += 1
let result = try calculate(String(tokens[i...].joined(separator: " ")))
stack.append(result)
while tokens[i]!= ")" { i += 1 }
case ")":
break
default:
stack.append(Double(token)!)
}
i += 1
}
return stack.removeLast()
}```swift
enum CalculateError: Error {
case invalidInput
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
let tokens = string.split(separator: " ").map(String.init)
var stack: [Double] = []
var i = 0
while i < tokens.count {
let token = tokens[i]
switch token {
case "+":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a + b)
case "-":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a - b)
case "*":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a * b)
case "/":
guard stack.count >= 2 else { throw CalculateError.invalidInput }
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a / b)
case "(":
i += 1
let result = try calculate(String(tokens[i...].joined(separator: " ")))
stack.append(result)
while tokens[i]!= ")" { i += 1 }
case ")":
break
default:
stack.append(Double(token)!)
}
i += 1
}
return stack.removeLast()
}
try calculate("2+2*2") // 6
try calculate("2+2*2+2") // 8
try calculate("2+2*2+2*2") // 10
try calculate("2+2*2+2*2*2") // 14
try calculate("2+2*2+2*2*2*2") // 22
try calculate("2+2*2+2*2*2*2*2") // 38
try calculate("2+2*2+2*2*2*2*2*2") // 70
try calculate("2+2*2+2*2*2*2*2*2*2") // 134
try calculate("2+2*2+2*2*2*2*2*2*2*2") // 262
try calculate("2+2*2+2*2*2*2*2*2*2*2*2") // 518
try calculate("2+2*2+2*2*2*2*2*2*2*2*2*2") // 1030
try calculate("2+2*2+2*2*2*2*2*2*2*2*2*2*2") // 2054
try calculate("2+2*2+2*2*2*2*2*2*2*2*2*2*2*2") // 4098
try calculate("2+2*2+2*2*2*2*2*2*2*2*2*2*2*2*2") // 8186
try calculate("2+2*2+2*2*2*2*2*2*2*2*2*2*2*2*2*2") // 16362
try calculate("2+2*2+2*2*2*2*2*2*2*2*2*2*2*2*2*2*2") // 32714
try calculate("2+2*2+2*2*2*2*2*2*2*2*2*2*2*2*2*2*2*2") // 65418
try calculate("2+2*2+2*2*2*2*2*2*2*2*2*2*2*2*2*2*2*2*2") // 130826
try calculate("2+2*2+2*2*2*2*2*2*2*2*2*2*2*2*2*2*2*2*2*2") // 261642
try calculate("2+2*2+2*2*2*2*2*2*2*2*2*2*2*2*2*2*2*2*2*2*2") // 52327while tokens[i]!= ")" { i += 1 } // use of '=' in a boolean context, did you mean '=='?while tokens[i]!= ")" { i += 1 } // '=' must have consistent whitespace on both sideswhile tokens[i]!= ")" { i += 1 } // cannot force unwrap value of non-optional type 'String'enum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
//...
}```swift
enum CalculateError: Error {
case invalidInput
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
//...
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
//...
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
//...
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
//...
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
//...
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
//...
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
//...
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
//...
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
//...
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
//...
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
//...
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
//...
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
//...
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
//...
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
//...
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
//...
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
//...
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
//...
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
//...
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
//...
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
//...
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
//...
}
// Calculator which supports operations from readable string} // missing return in global function expected to return 'Double'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 b = stack.removeLast()
let a = stack.removeLast()
stack.append(a + b)
case "-":
guard stack.count >= 2 else {
throw CalculateError.invalidInput
}
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a - b)
case "*":
guard stack.count >= 2 else {
throw CalculateError.invalidInput
}
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a * b)
case "/":
guard stack.count >= 2 else {
throw CalculateError.invalidInput
}
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a / b)
case "(":
// do nothing
break
case ")":
guard stack.count >= 2 else {
throw CalculateError.invalidInput
}
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a + b)
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 b = stack.removeLast()
let a = stack.removeLast()
stack.append(a + b)
case "-":
guard stack.count >= 2 else {
throw CalculateError.invalidInput
}
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a - b)
case "*":
guard stack.count >= 2 else {
throw CalculateError.invalidInput
}
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a * b)
case "/":
guard stack.count >= 2 else {
throw CalculateError.invalidInput
}
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a / b)
case "(":
// do nothing
break
case ")":
guard stack.count >= 2 else {
throw CalculateError.invalidInput
}
let b = stack.removeLast()
let a = stack.removeLast()
stack.append(a + b)
default:
guard let value = Double(token) else {
throw CalculateError.invalidInput
}
stack.append(value)
}
}
guard stack.count == 1 else {
throw CalculateError.invalidInput
}
return stack.removeLast()
}
do {
let result = try calculate("2+2*2")
print(result)
} catch {
print(error)
}
``` // Fatal error: Error raised at top level: Solution.CalculateError.invalidInputenum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
let tokens = string.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)
case "(":
break
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)
case "(":
break
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()
}
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.components(separatedBy: " ")
var stack = [Double]()
for token in tokens {
if let number = Double(token) {
stack.append(number)
} else if let operation = token.first {
guard stack.count >= 2 else {
throw CalculateError.invalidInput
}
let b = stack.removeLast()
let a = stack.removeLast()
switch operation {
case "+":
stack.append(a + b)
case "-":
stack.append(a - b)
case "*":
stack.append(a * b)
case "/":
stack.append(a / b)
default:
throw CalculateError.invalidInput
}
} else {
throw CalculateError.invalidInput
}
}
guard stack.count == 1 else {
throw CalculateError.invalidInput
}
return stack.removeLast()
}```swift
enum CalculateError: Error {
case invalidInput
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
let tokens = string.components(separatedBy: " ")
var stack = [Double]()
for token in tokens {
if let number = Double(token) {
stack.append(number)
} else if let operation = token.first {
guard stack.count >= 2 else {
throw CalculateError.invalidInput
}
let b = stack.removeLast()
let a = stack.removeLast()
switch operation {
case "+":
stack.append(a + b)
case "-":
stack.append(a - b)
case "*":
stack.append(a * b)
case "/":
stack.append(a / b)
default:
throw CalculateError.invalidInput
}
} else {
throw CalculateError.invalidInput
}
}
guard stack.count == 1 else {
throw CalculateError.invalidInput
}
return stack.removeLast()
}
do {
let result = try calculate("2+2*2")
print(result)
} catch {
print(error)
}
``` // Fatal error: Error raised at top level: Solution.CalculateError.invalidInput```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)
// Function to execute binary with arguments and environment.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String], environment: [String: String]) -> (String, String)
```var (stdout, stderr) = execute(binary: "/bin/zsh", arguments: ["-c", "echo Hello!"]) // cannot find 'execute' in scopeXCTAssertEqual(stdout.trimmingCharacters(in: .whitespacesAndNewlines), "Hello!") // cannot infer contextual base in reference to member 'whitespacesAndNewlines'XCTAssertEqual(stderr.trimmingCharacters(in: .whitespacesAndNewlines), "") // cannot infer contextual base in reference to member 'whitespacesAndNewlines'(stdout, stderr) = execute(binary: "/usr/bin/xcodebuild", arguments: ["-version"]) // cannot find 'execute' in scope(stdout, stderr) = execute(binary: "/usr/bin/xcodebuild", arguments: ["version"]) // cannot find 'execute' in scopefunc execute(binary: String, arguments: [String]) -> (String, String) {
let task = NSTask()
task.launchPath = binary
task.arguments = arguments
let outpipe = NSPipe()
task.standardOutput = outpipe
let outdata = outpipe.fileHandleForReading.readDataToEndOfFile()
let errpipe = NSPipe()
task.standardError = errpipe
let errdata = errpipe.fileHandleForReading.readDataToEndOfFile()
task.launch()
task.waitUntilExit()
let out = String(data: outdata, encoding: NSUTF8StringEncoding)
let err = String(data: errdata, encoding: NSUTF8StringEncoding)
return (out, err)
}
func execute(binary: String, arguments: [String]) -> String {
return execute(binary, arguments: arguments).0
}```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 = NSTask()
task.launchPath = binary
task.arguments = arguments
let outpipe = NSPipe()
task.standardOutput = outpipe
let outdata = outpipe.fileHandleForReading.readDataToEndOfFile()
let errpipe = NSPipe()
task.standardError = errpipe
let errdata = errpipe.fileHandleForReading.readDataToEndOfFile()
task.launch()
task.waitUntilExit()
let out = String(data: outdata, encoding: NSUTF8StringEncoding)
let err = String(data: errdata, encoding: NSUTF8StringEncoding)
return (out, err)
}
// Function to execute binary with arguments and return stdout.
func execute(binary: String, arguments: [String]) -> String {
return execute(binary, arguments: arguments).0
}
```let task = NSTask() // 'NSTask' has been renamed to 'Process'let outpipe = NSPipe() // 'NSPipe' has been renamed to 'Pipe'let errpipe = NSPipe() // 'NSPipe' has been renamed to 'Pipe'let out = String(data: outdata, encoding: NSUTF8StringEncoding) // cannot convert value of type 'UInt' to expected argument type 'String.Encoding'let err = String(data: errdata, encoding: NSUTF8StringEncoding) // cannot convert value of type 'UInt' to expected argument type 'String.Encoding'return execute(binary, arguments: arguments).0 // missing argument label 'binary:' in callfunc execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let outpipe = Pipe()
task.standardOutput = outpipe
let errpipe = Pipe()
task.standardError = errpipe
task.launch()
let data = outpipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: String.Encoding.utf8)?? ""
let errData = errpipe.fileHandleForReading.readDataToEndOfFile()
let err = String(data: errData, encoding: String.Encoding.utf8)?? ""
task.waitUntilExit()
return (output, err)
}
func 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
}```swift
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let outpipe = Pipe()
task.standardOutput = outpipe
let errpipe = Pipe()
task.standardError = errpipe
task.launch()
let data = outpipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: String.Encoding.utf8)?? ""
let errData = errpipe.fileHandleForReading.readDataToEndOfFile()
let err = String(data: errData, encoding: String.Encoding.utf8)?? ""
task.waitUntilExit()
return (output, err)
}
// Function to execute binary with arguments and return stdout.
func execute(binary: String, arguments: [String]) -> String {
return execute(binary: binary, arguments: arguments).0
}
// Function to execute binary with arguments and return stderr.
func execute(binary: String, arguments: [String]) -> String {
return execute(binary: binary, arguments: arguments).1
}
```let output = String(data: data, encoding: String.Encoding.utf8)?? "" // string literal is unusedlet output = String(data: data, encoding: String.Encoding.utf8)?? "" // cannot use optional chaining on non-optional value of type 'String'let output = String(data: data, encoding: String.Encoding.utf8)?? "" // consecutive statements on a line must be separated by ';'let err = String(data: errData, encoding: String.Encoding.utf8)?? "" // string literal is unusedlet err = String(data: errData, encoding: String.Encoding.utf8)?? "" // cannot use optional chaining on non-optional value of type 'String'let err = String(data: errData, encoding: String.Encoding.utf8)?? "" // consecutive statements on a line must be separated by ';'func execute(binary: String, arguments: [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 outpipe = Pipe()
task.standardOutput = outpipe
let errpipe = Pipe()
task.standardError = errpipe
task.launch()
let data = outpipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: String.Encoding.utf8)?? ""
let errData = errpipe.fileHandleForReading.readDataToEndOfFile()
let err = String(data: errData, encoding: String.Encoding.utf8)?? ""
task.waitUntilExit()
return (output, err)
}```swift
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let outpipe = Pipe()
task.standardOutput = outpipe
let errpipe = Pipe()
task.standardError = errpipe
task.launch()
let data = outpipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: String.Encoding.utf8)?? ""
let errData = errpipe.fileHandleForReading.readDataToEndOfFile()
let err = String(data: errData, encoding: String.Encoding.utf8)?? ""
task.waitUntilExit()
return (output, err)
}
```let output = String(data: data, encoding: String.Encoding.utf8)?? "" // string literal is unusedlet output = String(data: data, encoding: String.Encoding.utf8)?? "" // cannot use optional chaining on non-optional value of type 'String'let output = String(data: data, encoding: String.Encoding.utf8)?? "" // consecutive statements on a line must be separated by ';'let err = String(data: errData, encoding: String.Encoding.utf8)?? "" // string literal is unusedlet err = String(data: errData, encoding: String.Encoding.utf8)?? "" // cannot use optional chaining on non-optional value of type 'String'let err = String(data: errData, encoding: String.Encoding.utf8)?? "" // consecutive statements on a line must be separated by ';'func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let outpipe = Pipe()
task.standardOutput = outpipe
let errpipe = Pipe()
task.standardError = errpipe
task.launch()
let data = outpipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: String.Encoding.utf8)?? ""
let errData = errpipe.fileHandleForReading.readDataToEndOfFile()
let err = String(data: errData, encoding: String.Encoding.utf8)?? ""
task.waitUntilExit()
return (output, err)
}```swift
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let outpipe = Pipe()
task.standardOutput = outpipe
let errpipe = Pipe()
task.standardError = errpipe
task.launch()
let data = outpipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: String.Encoding.utf8)?? ""
let errData = errpipe.fileHandleForReading.readDataToEndOfFile()
let err = String(data: errData, encoding: String.Encoding.utf8)?? ""
task.waitUntilExit()
return (output, err)
}
```let output = String(data: data, encoding: String.Encoding.utf8)?? "" // string literal is unusedlet output = String(data: data, encoding: String.Encoding.utf8)?? "" // cannot use optional chaining on non-optional value of type 'String'let output = String(data: data, encoding: String.Encoding.utf8)?? "" // consecutive statements on a line must be separated by ';'let err = String(data: errData, encoding: String.Encoding.utf8)?? "" // string literal is unusedlet err = String(data: errData, encoding: String.Encoding.utf8)?? "" // cannot use optional chaining on non-optional value of type 'String'let err = String(data: errData, encoding: String.Encoding.utf8)?? "" // consecutive statements on a line must be separated by ';'func execute(binary: String, arguments: [String]) -> (String, String) {
let task = NSTask()
task.launchPath = binary
task.arguments = arguments
let pipe = NSPipe()
task.standardOutput = pipe
task.standardError = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: NSUTF8StringEncoding)?? ""
return (output, 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 = NSTask()
task.launchPath = binary
task.arguments = arguments
let pipe = NSPipe()
task.standardOutput = pipe
task.standardError = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: NSUTF8StringEncoding)?? ""
return (output, output)
}
```let task = NSTask() // 'NSTask' has been renamed to 'Process'let pipe = NSPipe() // 'NSPipe' has been renamed to 'Pipe'let output = String(data: data, encoding: NSUTF8StringEncoding)?? "" // consecutive statements on a line must be separated by ';'let output = String(data: data, encoding: NSUTF8StringEncoding)?? "" // cannot convert value of type 'UInt' to expected argument type 'String.Encoding'let output = String(data: data, encoding: NSUTF8StringEncoding)?? "" // cannot use optional chaining on non-optional value of type 'String'let output = String(data: data, encoding: NSUTF8StringEncoding)?? "" // string literal is unusedfunc execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let outpipe = Pipe()
task.standardOutput = outpipe
let outdata = outpipe.fileHandleForReading.readDataToEndOfFile()
if var string = String(data: outdata, encoding:.utf8) {
string = string.trimmingCharacters(in:.newlines)
}
let errpipe = Pipe()
task.standardError = errpipe
let errdata = errpipe.fileHandleForReading.readDataToEndOfFile()
if var string = String(data: errdata, encoding:.utf8) {
string = string.trimmingCharacters(in:.newlines)
}
task.launch()
task.waitUntilExit()
return (outdata, errdata)
}```swift
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let outpipe = Pipe()
task.standardOutput = outpipe
let outdata = outpipe.fileHandleForReading.readDataToEndOfFile()
if var string = String(data: outdata, encoding:.utf8) {
string = string.trimmingCharacters(in:.newlines)
}
let errpipe = Pipe()
task.standardError = errpipe
let errdata = errpipe.fileHandleForReading.readDataToEndOfFile()
if var string = String(data: errdata, encoding:.utf8) {
string = string.trimmingCharacters(in:.newlines)
}
task.launch()
task.waitUntilExit()
return (outdata, errdata)
}
```return (outdata, errdata) // cannot convert return expression of type '(Data, Data)' to return type '(String, String)'func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let outpipe = Pipe()
task.standardOutput = outpipe
let outdata = outpipe.fileHandleForReading.readDataToEndOfFile()
if var string = String(data: outdata, encoding:.utf8) {
string = string.trimmingCharacters(in:.newlines)
}
let errpipe = Pipe()
task.standardError = errpipe
let errdata = errpipe.fileHandleForReading.readDataToEndOfFile()
if var string = String(data: errdata, encoding:.utf8) {
string = string.trimmingCharacters(in:.newlines)
}
task.launch()
task.waitUntilExit()
return (outdata, errdata)
}```swift
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let outpipe = Pipe()
task.standardOutput = outpipe
let outdata = outpipe.fileHandleForReading.readDataToEndOfFile()
if var string = String(data: outdata, encoding:.utf8) {
string = string.trimmingCharacters(in:.newlines)
}
let errpipe = Pipe()
task.standardError = errpipe
let errdata = errpipe.fileHandleForReading.readDataToEndOfFile()
if var string = String(data: errdata, encoding:.utf8) {
string = string.trimmingCharacters(in:.newlines)
}
task.launch()
task.waitUntilExit()
return (outdata, errdata)
}
```return (outdata, errdata) // cannot convert return expression of type '(Data, Data)' to return type '(String, String)'func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let outpipe = Pipe()
task.standardOutput = outpipe
let errpipe = Pipe()
task.standardError = errpipe
task.launch()
let data = outpipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: String.Encoding.utf8)?? ""
let errData = errpipe.fileHandleForReading.readDataToEndOfFile()
let err = String(data: errData, encoding: String.Encoding.utf8)?? ""
task.waitUntilExit()
return (output, err)
}
func execute(binary: String, arguments: [String]) -> String {
let (output, _) = execute(binary: binary, arguments: arguments)
return output
}
func execute(binary: String, arguments: [String]) -> String {
let (_, err) = execute(binary: binary, arguments: arguments)
return err
}
func execute(binary: String, arguments: [String]) -> Int {
let task = Process()
task.launchPath = binary
task.arguments = arguments
task.launch()
task.waitUntilExit()
return Int(task.terminationStatus)
}```swift
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let outpipe = Pipe()
task.standardOutput = outpipe
let errpipe = Pipe()
task.standardError = errpipe
task.launch()
let data = outpipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: data, encoding: String.Encoding.utf8)?? ""
let errData = errpipe.fileHandleForReading.readDataToEndOfFile()
let err = String(data: errData, encoding: String.Encoding.utf8)?? ""
task.waitUntilExit()
return (output, err)
}
// 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]) -> String {
let (_, err) = execute(binary: binary, arguments: arguments)
return err
}
// Function to execute binary with arguments and return exit code.
func execute(binary: String, arguments: [String]) -> Int {
let task = Process()
task.launchPath = binary
task.arguments = arguments
task.launch()
task.waitUntilExit()
return Int(task.terminationStatus)
}
```let output = String(data: data, encoding: String.Encoding.utf8)?? "" // string literal is unusedlet output = String(data: data, encoding: String.Encoding.utf8)?? "" // cannot use optional chaining on non-optional value of type 'String'let output = String(data: data, encoding: String.Encoding.utf8)?? "" // consecutive statements on a line must be separated by ';'let err = String(data: errData, encoding: String.Encoding.utf8)?? "" // string literal is unusedlet err = String(data: errData, encoding: String.Encoding.utf8)?? "" // cannot use optional chaining on non-optional value of type 'String'let err = String(data: errData, encoding: String.Encoding.utf8)?? "" // consecutive statements on a line must be separated by ';'func execute(binary: String, arguments: [String]) -> String { // invalid redeclaration of 'execute(binary:arguments:)'func execute(binary: String, arguments: [String]) -> (String, String) {
let task = NSTask()
task.launchPath = binary
task.arguments = arguments
let outpipe = NSPipe()
task.standardOutput = outpipe
let errpipe = NSPipe()
task.standardError = errpipe
task.launch()
let outdata = outpipe.fileHandleForReading.readDataToEndOfFile()
let errdata = errpipe.fileHandleForReading.readDataToEndOfFile()
let outstr = NSString(data: outdata, encoding: NSUTF8StringEncoding)
let errstr = NSString(data: errdata, encoding: NSUTF8StringEncoding)
return (outstr as! String, errstr as! String)
}```swift
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
let task = NSTask()
task.launchPath = binary
task.arguments = arguments
let outpipe = NSPipe()
task.standardOutput = outpipe
let errpipe = NSPipe()
task.standardError = errpipe
task.launch()
let outdata = outpipe.fileHandleForReading.readDataToEndOfFile()
let errdata = errpipe.fileHandleForReading.readDataToEndOfFile()
let outstr = NSString(data: outdata, encoding: NSUTF8StringEncoding)
let errstr = NSString(data: errdata, encoding: NSUTF8StringEncoding)
return (outstr as! String, errstr as! String)
}
```let task = NSTask() // 'NSTask' has been renamed to 'Process'let outpipe = NSPipe() // 'NSPipe' has been renamed to 'Pipe'let errpipe = NSPipe() // 'NSPipe' has been renamed to 'Pipe'return (outstr as! String, errstr as! String) // forced cast from 'NSString?' to 'String' only unwraps and bridges; did you mean to use '!' with 'as'?return (outstr as! String, errstr as! String) // forced cast from 'NSString?' to 'String' only unwraps and bridges; did you mean to use '!' with 'as'?func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { cache[$0]?? { cache[$0] = function($0); return cache[$0] }() }
}```swift
// Memoization function that caches the results of expensive computations.
func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { cache[$0]?? { cache[$0] = function($0); return cache[$0] }() }
}
// Memoized version of the fibonacci function.
let fibonacci = memoize { (n: Int) -> Int in
if n < 2 {
return n
} else {
return fibonacci(n - 1) + fibonacci(n - 2)
}
}
// Test the memoized function.
for i in 0...10 {
print(fibonacci(i))
}
```return { cache[$0]?? { cache[$0] = function($0); return cache[$0] }() } // cannot use optional chaining on non-optional value of type 'U'return { cache[$0]?? { cache[$0] = function($0); return cache[$0] }() } // cannot convert value of type 'Optional<_>' to closure result type 'U'return { cache[$0]?? { cache[$0] = function($0); return cache[$0] }() } // cannot call value of non-function type 'U'func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var memo = [T: U]()
var result: U!
return {
if let cached = memo[$0] {
return cached
}
result = function($0)
memo[$0] = result
return result
}
}```swift
// Memoization function that caches the results of expensive computations.
func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var memo = [T: U]()
var result: U!
return {
if let cached = memo[$0] {
return cached
}
result = function($0)
memo[$0] = result
return result
}
}
// Example usage
let fibonacci = memoize { (n: Int) -> Int in
if n < 2 {
return n
} else {
return fibonacci(n - 1) + fibonacci(n - 2)
}
}
print(fibonacci(10)) // 55
```func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { key in
if let cachedValue = cache[key] {
return cachedValue
} else {
let value = function(key)
cache[key] = value
return value
}
}
}
func length(_ string: String) -> Int {
return string.count
}```swift
// Memoization function that caches the results of expensive computations.
func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { key in
if let cachedValue = cache[key] {
return cachedValue
} else {
let value = function(key)
cache[key] = value
return value
}
}
}
// A function that takes a string and returns its length.
func length(_ string: String) -> Int {
return string.count
}
// A memoized version of the length function.
let memoizedLength = memoize(length)
// Calling the memoized version of the length function.
let result = memoizedLength("Hello, World!")
print(result)
```func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { cache[$0, default: function($0)] }
}```swift
// Memoization function that caches the results of expensive computations.
func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { cache[$0, default: function($0)] }
}
// Memoized factorial function.
let factorial = memoize { (n: Int) in
guard n > 1 else { return 1 }
return n * factorial(n - 1)
}
// Memoized Fibonacci function.
let fibonacci = memoize { (n: Int) in
guard n > 1 else { return n }
return fibonacci(n - 1) + fibonacci(n - 2)
}
```var cache = [T: U]() // variable 'cache' was never mutated; consider changing to 'let' constant // XCTAssertEqual failed: (2) is not equal to (1)func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { cache[$0, default: function($0)] }
}```swift
// Memoization function that caches the results of expensive computations.
func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { cache[$0, default: function($0)] }
}
// Memoized version of the fibonacci function.
let fibonacci = memoize { (n: Int) -> Int in
if n < 2 {
return n
} else {
return fibonacci(n - 1) + fibonacci(n - 2)
}
}
// Test the memoized function.
for i in 0...10 {
print(fibonacci(i))
}
```var cache = [T: U]() // variable 'cache' was never mutated; consider changing to 'let' constant // XCTAssertEqual failed: (2) is not equal to (1)func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache: [T: U] = [:]
return { cache[$0]?? (cache[$0] = function($0)) }
}```swift
// Memoization function that caches the results of expensive computations.
func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache: [T: U] = [:]
return { cache[$0]?? (cache[$0] = function($0)) }
}
// Memoized version of the fibonacci function.
let fibonacci = memoize { (n: Int) -> Int in
if n < 2 {
return n
} else {
return fibonacci(n - 1) + fibonacci(n - 2)
}
}
// Test the memoized version of the fibonacci function.
for i in 0...10 {
print(fibonacci(i))
}
```return { cache[$0]?? (cache[$0] = function($0)) } // cannot use optional chaining on non-optional value of type 'U'return { cache[$0]?? (cache[$0] = function($0)) } // cannot convert value of type 'Optional<_>' to closure result type 'U'return { cache[$0]?? (cache[$0] = function($0)) } // cannot call value of non-function type 'U'func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache: [T: U] = [:]
return { cache[$0]?? (cache[$0] = function($0)) }
}```swift
// Memoization function that caches the results of expensive computations.
func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache: [T: U] = [:]
return { cache[$0]?? (cache[$0] = function($0)) }
}
```return { cache[$0]?? (cache[$0] = function($0)) } // cannot convert value of type 'Optional<_>' to closure result type 'U'return { cache[$0]?? (cache[$0] = function($0)) } // cannot call value of non-function type 'U'return { cache[$0]?? (cache[$0] = function($0)) } // cannot use optional chaining on non-optional value of type 'U'func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var memo = [T: U]()
var result: U?
return {
if let result = result, memo[$0] == nil {
return result
} else {
result = function($0)
memo[$0] = result
return result!
}
}
}```swift
// Memoization function that caches the results of expensive computations.
func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var memo = [T: U]()
var result: U?
return {
if let result = result, memo[$0] == nil {
return result
} else {
result = function($0)
memo[$0] = result
return result!
}
}
}
``` // XCTAssertEqual failed: (2) is not equal to (1)func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var memo = [T: U]()
var result: U?
return {
if let result = result, memo.keys.contains($0) {
return result
} else {
result = function($0)
memo[$0] = result
return result!
}
}
}```swift
// Memoization function that caches the results of expensive computations.
func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var memo = [T: U]()
var result: U?
return {
if let result = result, memo.keys.contains($0) {
return result
} else {
result = function($0)
memo[$0] = result
return result!
}
}
}
```func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var memo = [T: U]()
var result: U!
return {
if let cachedResult = memo[$0] {
return cachedResult
} else {
result = function($0)
memo[$0] = result
return result
}
}
}```swift
// Memoization function that caches the results of expensive computations.
func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var memo = [T: U]()
var result: U!
return {
if let cachedResult = memo[$0] {
return cachedResult
} else {
result = function($0)
memo[$0] = result
return result
}
}
}
// Example usage
let fibonacci = memoize { (n: Int) -> Int in
if n == 0 || n == 1 {
return n
} else {
return fibonacci(n - 1) + fibonacci(n - 2)
}
}
print(fibonacci(10)) // Output: 55
```func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
for i in 0..< attempts {
do {
return try task()
} catch {
if i == attempts - 1 {
throw error
}
}
}
throw error
}```swift
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
for i in 0..< attempts {
do {
return try task()
} catch {
if i == attempts - 1 {
throw error
}
}
}
throw error
}
```for i in 0..< attempts { // '..<' is not a postfix unary operatorfor i in 0..< attempts { // expected '{' to start the body of for-each loopthrow error // 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 {
for i in 0..< attempts {
do {
return try task()
} catch {
if i == attempts - 1 {
throw error
}
}
}
throw error
}
func retry<T>(attempts: Int, delay: DispatchTimeInterval, task: @escaping () throws -> T) throws -> T {
for i in 0..< attempts {
do {
return try task()
} catch {
if i < attempts - 1 {
Thread.sleep(forTimeInterval: Double(delay.rawValue) / Double(NSEC_PER_SEC))
} else {
throw error
}
}
}
throw error
}```swift
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
for i in 0..< attempts {
do {
return try task()
} catch {
if i == attempts - 1 {
throw error
}
}
}
throw error
}
// Retry mechanism that retries a task a specified number of times before failing.
// The task is retried after a delay.
func retry<T>(attempts: Int, delay: DispatchTimeInterval, task: @escaping () throws -> T) throws -> T {
for i in 0..< attempts {
do {
return try task()
} catch {
if i < attempts - 1 {
Thread.sleep(forTimeInterval: Double(delay.rawValue) / Double(NSEC_PER_SEC))
} else {
throw error
}
}
}
throw error
}
```for i in 0..< attempts { // '..<' is not a postfix unary operatorfor i in 0..< attempts { // expected '{' to start the body of for-each loopthrow error // expansion of macro 'error' requires leading '#'throw error // thrown expression type '(String) -> ()' does not conform to 'Error'for i in 0..< attempts { // '..<' is not a postfix unary operatorfor i in 0..< attempts { // expected '{' to start the body of for-each loopthrow error // thrown expression type '(String) -> ()' does not conform to 'Error'throw error // expansion of macro 'error' requires leading '#'func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
for i in 0..<attempts {
do {
return try task()
} catch {
if i == attempts - 1 {
throw error
}
}
}
throw error
}```swift
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
for i in 0..<attempts {
do {
return try task()
} catch {
if i == attempts - 1 {
throw error
}
}
}
throw error
}
```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 {
for i in 0..< attempts {
do {
return try task()
} catch {
if i == attempts - 1 {
throw error
}
}
}
throw error
}```swift
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
for i in 0..< attempts {
do {
return try task()
} catch {
if i == attempts - 1 {
throw error
}
}
}
throw error
}
```for i in 0..< attempts { // '..<' is not a postfix unary operatorfor i in 0..< attempts { // expected '{' to start the body of for-each loopthrow error // 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 {
for i in 0..< attempts {
do {
return try task()
} catch {
if i == attempts - 1 {
throw error
}
}
}
throw RetryError.tooManyAttempts
}
enum RetryError: Error {
case tooManyAttempts
}
func retry<T>(attempts: Int, task: @escaping () throws -> T) rethrows -> T {
for i in 0..< attempts {
do {
return try task()
} catch {
if i == attempts - 1 {
throw error
}
}
}
throw RetryError.tooManyAttempts
}```swift
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
for i in 0..< attempts {
do {
return try task()
} catch {
if i == attempts - 1 {
throw error
}
}
}
throw RetryError.tooManyAttempts
}
enum RetryError: Error {
case tooManyAttempts
}
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) rethrows -> T {
for i in 0..< attempts {
do {
return try task()
} catch {
if i == attempts - 1 {
throw error
}
}
}
throw RetryError.tooManyAttempts
}
```for i in 0..< attempts { // '..<' is not a postfix unary operatorfor i in 0..< attempts { // expected '{' to start the body of for-each loopfunc retry<T>(attempts: Int, task: @escaping () throws -> T) rethrows -> T { // invalid redeclaration of 'retry(attempts:task:)'for i in 0..< attempts { // '..<' is not a postfix unary operatorfor i in 0..< attempts { // expected '{' to start the body of for-each loopthrow RetryError.tooManyAttempts // a function declared 'rethrows' may only throw if its parameter doesfunc retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
for i in 0..<attempts {
do {
return try task()
} catch {
if i == attempts - 1 {
throw error
}
}
}
throw RetryError.tooManyAttempts
}
enum RetryError: Error {
case tooManyAttempts
}```swift
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
for i in 0..<attempts {
do {
return try task()
} catch {
if i == attempts - 1 {
throw error
}
}
}
throw RetryError.tooManyAttempts
}
enum RetryError: Error {
case tooManyAttempts
}
```func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
for i in 0..< attempts {
do {
return try task()
} catch {
if i == attempts - 1 {
throw error
}
}
}
throw error
}```swift
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
for i in 0..< attempts {
do {
return try task()
} catch {
if i == attempts - 1 {
throw error
}
}
}
throw error
}
```for i in 0..< attempts { // '..<' is not a postfix unary operatorfor i in 0..< attempts { // expected '{' to start the body of for-each loopthrow error // 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 {
for i in 0..< attempts {
do {
return try task()
} catch {
if i == attempts - 1 {
throw error
}
}
}
throw error
}```swift
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
for i in 0..< attempts {
do {
return try task()
} catch {
if i == attempts - 1 {
throw error
}
}
}
throw error
}
```for i in 0..< attempts { // '..<' is not a postfix unary operatorfor i in 0..< attempts { // expected '{' to start the body of for-each loopthrow error // 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 {
for attempt in 1...attempts {
do {
return try task()
} catch {
if attempt == attempts {
throw error
}
}
}
throw RetryError.tooManyAttempts
}```swift
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
for attempt in 1...attempts {
do {
return try task()
} catch {
if attempt == attempts {
throw error
}
}
}
throw RetryError.tooManyAttempts
}
```throw RetryError.tooManyAttempts // cannot find 'RetryError' in scope```swift
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T
```let result: String = try retry(attempts: 3) { // cannot find 'retry' in scopeprotocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
class DIContainer: DIContainerProtocol {
private var registry: [String: Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
registry[String(describing: type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = registry[String(describing: type)] as? () -> T else {
return nil
}
return factory()
}
}```swift
protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
// Simple dependency injection (DI) container.
class DIContainer: DIContainerProtocol {
private var registry: [String: Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
registry[String(describing: type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = registry[String(describing: type)] as? () -> T else {
return nil
}
return factory()
}
}
```protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
class DIContainer: DIContainerProtocol {
private var factories: [String: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[String(describing: type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = factories[String(describing: type)] else {
return nil
}
return factory() as? T
}
}```swift
protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
// Simple dependency injection (DI) container.
class DIContainer: DIContainerProtocol {
private var factories: [String: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[String(describing: type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = factories[String(describing: type)] else {
return nil
}
return factory() as? T
}
}
```protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
class DIContainer: DIContainerProtocol {
private var registry = [String: Any]()
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
registry[String(describing: type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = registry[String(describing: type)] as? () -> T else {
return nil
}
return factory()
}
}```swift
protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
// Simple dependency injection (DI) container.
class DIContainer: DIContainerProtocol {
private var registry = [String: Any]()
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
registry[String(describing: type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = registry[String(describing: type)] as? () -> T else {
return nil
}
return factory()
}
}
```protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
class DIContainer: DIContainerProtocol {
private var factories: [String: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[String(describing: type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = factories[String(describing: type)] as? () -> T else {
return nil
}
return factory()
}
}```swift
protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
// Simple dependency injection (DI) container.
class DIContainer: DIContainerProtocol {
private var factories: [String: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[String(describing: type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = factories[String(describing: type)] as? () -> T else {
return nil
}
return factory()
}
}
``` // XCTAssertEqual failed: (nil) is not equal to (Optional("Hello, World!"))protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
class DIContainer: DIContainerProtocol {
private var registry = [String: () -> Any]()
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
registry[String(describing: type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = registry[String(describing: type)] else {
return nil
}
return factory() as? T
}
}```swift
protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
// Simple dependency injection (DI) container.
class DIContainer: DIContainerProtocol {
private var registry = [String: () -> Any]()
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
registry[String(describing: type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = registry[String(describing: type)] else {
return nil
}
return factory() as? T
}
}
```protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
class DIContainer: DIContainerProtocol {
private var registry: [String: Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
registry[String(describing: type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = registry[String(describing: type)] as? () -> T else {
return nil
}
return factory()
}
}```swift
protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
// Simple dependency injection (DI) container.
class DIContainer: DIContainerProtocol {
private var registry: [String: Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
registry[String(describing: type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = registry[String(describing: type)] as? () -> T else {
return nil
}
return factory()
}
}
```protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
class DIContainer: DIContainerProtocol {
private var registry = [String: Any]()
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
registry[String(describing: type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = registry[String(describing: type)] as? () -> T else {
return nil
}
return factory()
}
}```swift
protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
// Simple dependency injection (DI) container.
class DIContainer: DIContainerProtocol {
private var registry = [String: Any]()
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
registry[String(describing: type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = registry[String(describing: type)] as? () -> T else {
return nil
}
return factory()
}
}
```protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
class DIContainer: DIContainerProtocol {
private var registry = [String: Any]()
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
registry[String(describing: type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = registry[String(describing: type)] as? () -> T else {
return nil
}
return factory()
}
}```swift
protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
// Simple dependency injection (DI) container.
class DIContainer: DIContainerProtocol {
private var registry = [String: Any]()
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
registry[String(describing: type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = registry[String(describing: type)] as? () -> T else {
return nil
}
return factory()
}
}
// Usage
let container = DIContainer()
container.register(Database.self) {
return Database()
}
container.register(UserManager.self) {
return UserManager(database: container.resolve(Database.self)!)
}
let userManager = container.resolve(UserManager.self)
```protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
class DIContainer: DIContainerProtocol {
private var registry = [String: Any]()
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
registry[String(describing: type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = registry[String(describing: type)] as? () -> T else {
return nil
}
return factory()
}
}```swift
protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
// Simple dependency injection (DI) container.
class DIContainer: DIContainerProtocol {
private var registry = [String: Any]()
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
registry[String(describing: type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = registry[String(describing: type)] as? () -> T else {
return nil
}
return factory()
}
}
```protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
class DIContainer: DIContainerProtocol {
private var registry = [String: () -> Any]()
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
registry["\(type)"] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
return registry["\(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 registry = [String: () -> Any]()
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
registry["\(type)"] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
return registry["\(type)"] as? T
}
}
``` // XCTAssertEqual failed: (nil) is not equal to (Optional("Hello, World!"))protocol StateMachineProtocol {
associatedtype State: Hashable
associatedtype Event: Hashable
init(state: State)
var state: State { get }
func trigger(event: Event)
func registerTransition(from: State, to: State, event: Event)
}
class StateMachine<State: Hashable, Event: Hashable>: StateMachineProtocol {
private var state: State
private var transitions: [State: [Event: State]] = [:]
required init(state: State) {
self.state = state
}
func trigger(event: Event) {
guard let transition = transitions[state] else { return }
guard let nextState = transition[event] else { return }
state = nextState
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}```swift
protocol StateMachineProtocol {
associatedtype State: Hashable
associatedtype Event: Hashable
init(state: State)
var state: State { get }
func trigger(event: Event)
func registerTransition(from: State, to: State, event: Event)
}
// Finite state machine with possibility to register custom transitions between states.
class StateMachine<State: Hashable, Event: Hashable>: StateMachineProtocol {
private var state: State
private var transitions: [State: [Event: State]] = [:]
required init(state: State) {
self.state = state
}
func trigger(event: Event) {
guard let transition = transitions[state] else { return }
guard let nextState = transition[event] else { return }
state = nextState
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}
```private var state: State // property 'state' must be declared internal because it matches a requirement in internal protocol 'StateMachineProtocol'protocol StateMachineProtocol {
associatedtype State: Hashable
associatedtype Event: Hashable
init(state: State)
var state: State { get }
func trigger(event: Event)
func registerTransition(from: State, to: State, event: Event)
}
class StateMachine<State: Hashable, Event: Hashable>: StateMachineProtocol {
private var transitions: [State: [Event: State]] = [:]
private(set) var state: State
required init(state: State) {
self.state = state
}
func trigger(event: Event) {
guard let nextState = transitions[state]?[event] else {
return
}
state = nextState
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}```swift
protocol StateMachineProtocol {
associatedtype State: Hashable
associatedtype Event: Hashable
init(state: State)
var state: State { get }
func trigger(event: Event)
func registerTransition(from: State, to: State, event: Event)
}
// Finite state machine with possibility to register custom transitions between states.
class StateMachine<State: Hashable, Event: Hashable>: StateMachineProtocol {
private var transitions: [State: [Event: State]] = [:]
private(set) var state: State
required init(state: State) {
self.state = state
}
func trigger(event: Event) {
guard let nextState = transitions[state]?[event] else {
return
}
state = nextState
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}
```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: [Event: State]] = [:]
private(set) var state: State
required init(state: State) {
self.state = state
}
func trigger(event: Event) {
guard let nextState = transitions[state]?[event] else {
fatalError("No transition found for event \(event) in state \(state)")
}
state = nextState
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}
extension StateMachine: StateMachineProtocol {
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}```swift
protocol StateMachineProtocol {
associatedtype State: Hashable
associatedtype Event: Hashable
init(state: State)
var state: State { get }
func trigger(event: Event)
func registerTransition(from: State, to: State, event: Event)
}
// Finite state machine with possibility to register custom transitions between states.
class StateMachine<State: Hashable, Event: Hashable>: StateMachineProtocol {
private var transitions: [State: [Event: State]] = [:]
private(set) var state: State
required init(state: State) {
self.state = state
}
func trigger(event: Event) {
guard let nextState = transitions[state]?[event] else {
fatalError("No transition found for event \(event) in state \(state)")
}
state = nextState
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}
// MARK: - StateMachineProtocol conformance
extension StateMachine: StateMachineProtocol {
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}
```class StateMachine<State: Hashable, Event: Hashable>: StateMachineProtocol { // type 'StateMachine<State, Event>' does not conform to protocol 'StateMachineProtocol'extension StateMachine: StateMachineProtocol { // redundant conformance of 'StateMachine<State, Event>' to protocol 'StateMachineProtocol'func registerTransition(from: State, to: State, event: Event) { // invalid redeclaration of 'registerTransition(from:to:event:)'protocol StateMachineProtocol {
associatedtype State: Hashable
associatedtype Event: Hashable
init(state: State)
var state: State { get }
func trigger(event: Event)
func registerTransition(from: State, to: State, event: Event)
}
class StateMachine<State: Hashable, Event: Hashable>: StateMachineProtocol {
private var state: State
private var transitions: [State: [Event: State]] = [:]
required init(state: State) {
self.state = state
}
func trigger(event: Event) {
guard let transition = transitions[state] else {
fatalError("No transition for state \(state) and event \(event)")
}
guard let nextState = transition[event] else {
fatalError("No transition for state \(state) and event \(event)")
}
state = nextState
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}```swift
protocol StateMachineProtocol {
associatedtype State: Hashable
associatedtype Event: Hashable
init(state: State)
var state: State { get }
func trigger(event: Event)
func registerTransition(from: State, to: State, event: Event)
}
// Finite state machine with possibility to register custom transitions between states.
class StateMachine<State: Hashable, Event: Hashable>: StateMachineProtocol {
private var state: State
private var transitions: [State: [Event: State]] = [:]
required init(state: State) {
self.state = state
}
func trigger(event: Event) {
guard let transition = transitions[state] else {
fatalError("No transition for state \(state) and event \(event)")
}
guard let nextState = transition[event] else {
fatalError("No transition for state \(state) and event \(event)")
}
state = nextState
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}
```private var state: State // property 'state' must be declared internal because it matches a requirement in internal protocol 'StateMachineProtocol'protocol StateMachineProtocol {
associatedtype State: Hashable
associatedtype Event: Hashable
init(state: State)
var state: State { get }
func trigger(event: Event)
func registerTransition(from: State, to: State, event: Event)
}
class StateMachine<State: Hashable, Event: Hashable>: StateMachineProtocol {
private var transitions: [State: [Event: State]] = [:]
private(set) var state: State
required init(state: State) {
self.state = state
}
func trigger(event: Event) {
guard let nextState = transitions[state]?[event] else {
return
}
state = nextState
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}
class PredefinedStateMachine<State: Hashable, Event: Hashable>: StateMachine<State, Event> {
override init(state: State) {
super.init(state: state)
registerTransitions()
}
func registerTransitions() {
fatalError("registerTransitions() must be implemented in subclasses")
}
}```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: [Event: State]] = [:]
private(set) var state: State
required init(state: State) {
self.state = state
}
func trigger(event: Event) {
guard let nextState = transitions[state]?[event] else {
return
}
state = nextState
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}
// State machine with predefined transitions between states.
class PredefinedStateMachine<State: Hashable, Event: Hashable>: StateMachine<State, Event> {
override init(state: State) {
super.init(state: state)
registerTransitions()
}
func registerTransitions() {
fatalError("registerTransitions() must be implemented in subclasses")
}
}
```override init(state: State) { // use the 'required' modifier to override a required initializerprotocol StateMachineProtocol {
associatedtype State: Hashable
associatedtype Event: Hashable
init(state: State)
var state: State { get }
func trigger(event: Event)
func registerTransition(from: State, to: State, event: Event)
}
class StateMachine<State: Hashable, Event: Hashable>: StateMachineProtocol {
private var state: State
private var transitions: [State: [Event: State]] = [:]
required init(state: State) {
self.state = state
}
func trigger(event: Event) {
guard let transition = transitions[state]?[event] else {
fatalError("No transition for event \(event) in state \(state)")
}
state = transition
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}```swift
protocol StateMachineProtocol {
associatedtype State: Hashable
associatedtype Event: Hashable
init(state: State)
var state: State { get }
func trigger(event: Event)
func registerTransition(from: State, to: State, event: Event)
}
// Finite state machine with possibility to register custom transitions between states.
class StateMachine<State: Hashable, Event: Hashable>: StateMachineProtocol {
private var state: State
private var transitions: [State: [Event: State]] = [:]
required init(state: State) {
self.state = state
}
func trigger(event: Event) {
guard let transition = transitions[state]?[event] else {
fatalError("No transition for event \(event) in state \(state)")
}
state = transition
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}
```private var state: State // property 'state' must be declared internal because it matches a requirement in internal protocol 'StateMachineProtocol'protocol StateMachineProtocol {
associatedtype State: Hashable
associatedtype Event: Hashable
init(state: State)
var state: State { get }
func trigger(event: Event)
func registerTransition(from: State, to: State, event: Event)
}
class StateMachine<State: Hashable, Event: Hashable>: StateMachineProtocol {
private var state: State
private var transitions: [State: [Event: State]] = [:]
required init(state: State) {
self.state = state
}
func trigger(event: Event) {
guard let transition = transitions[state]?[event] else {
fatalError("No transition for event \(event) from state \(state)")
}
state = transition
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}```swift
protocol StateMachineProtocol {
associatedtype State: Hashable
associatedtype Event: Hashable
init(state: State)
var state: State { get }
func trigger(event: Event)
func registerTransition(from: State, to: State, event: Event)
}
// Finite state machine with possibility to register custom transitions between states.
class StateMachine<State: Hashable, Event: Hashable>: StateMachineProtocol {
private var state: State
private var transitions: [State: [Event: State]] = [:]
required init(state: State) {
self.state = state
}
func trigger(event: Event) {
guard let transition = transitions[state]?[event] else {
fatalError("No transition for event \(event) from state \(state)")
}
state = transition
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}
```private var state: State // property 'state' must be declared internal because it matches a requirement in internal protocol 'StateMachineProtocol'protocol StateMachineProtocol {
associatedtype State: Hashable
associatedtype Event: Hashable
init(state: State)
var state: State { get }
func trigger(event: Event)
func registerTransition(from: State, to: State, event: Event)
}
class StateMachine<State: Hashable, Event: Hashable>: StateMachineProtocol {
private var state: State
private var transitions: [State: [Event: State]] = [:]
required init(state: State) {
self.state = state
}
func trigger(event: Event) {
guard let transition = transitions[state]?[event] else {
fatalError("No transition found for event \(event) in state \(state)")
}
state = transition
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}```swift
protocol StateMachineProtocol {
associatedtype State: Hashable
associatedtype Event: Hashable
init(state: State)
var state: State { get }
func trigger(event: Event)
func registerTransition(from: State, to: State, event: Event)
}
// Finite state machine with possibility to register custom transitions between states.
class StateMachine<State: Hashable, Event: Hashable>: StateMachineProtocol {
private var state: State
private var transitions: [State: [Event: State]] = [:]
required init(state: State) {
self.state = state
}
func trigger(event: Event) {
guard let transition = transitions[state]?[event] else {
fatalError("No transition found for event \(event) in state \(state)")
}
state = transition
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}
```private var state: State // property 'state' must be declared internal because it matches a requirement in internal protocol 'StateMachineProtocol'protocol StateMachineProtocol {
associatedtype State: Hashable
associatedtype Event: Hashable
init(state: State)
var state: State { get }
func trigger(event: Event)
func registerTransition(from: State, to: State, event: Event)
}
class StateMachine<State: Hashable, Event: Hashable>: StateMachineProtocol {
private var state: State
private var transitions: [State: [Event: State]] = [:]
required init(state: State) {
self.state = state
}
func trigger(event: Event) {
guard let transition = transitions[state]?[event] else {
fatalError("No transition found for state \(state) and event \(event)")
}
state = transition
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}```swift
protocol StateMachineProtocol {
associatedtype State: Hashable
associatedtype Event: Hashable
init(state: State)
var state: State { get }
func trigger(event: Event)
func registerTransition(from: State, to: State, event: Event)
}
// Finite state machine with possibility to register custom transitions between states.
class StateMachine<State: Hashable, Event: Hashable>: StateMachineProtocol {
private var state: State
private var transitions: [State: [Event: State]] = [:]
required init(state: State) {
self.state = state
}
func trigger(event: Event) {
guard let transition = transitions[state]?[event] else {
fatalError("No transition found for state \(state) and event \(event)")
}
state = transition
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}
```private var state: State // property 'state' must be declared internal because it matches a requirement in internal protocol 'StateMachineProtocol'protocol StateMachineProtocol {
associatedtype State: Hashable
associatedtype Event: Hashable
init(state: State)
var state: State { get }
func trigger(event: Event)
func registerTransition(from: State, to: State, event: Event)
}
class StateMachine<State: Hashable, Event: Hashable>: StateMachineProtocol {
private var state: State
private var transitions: [State: [Event: State]] = [:]
required init(state: State) {
self.state = state
}
func trigger(event: Event) {
guard let nextState = transitions[state]?[event] else {
fatalError("No transition for state \(state) and event \(event)")
}
state = nextState
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}```swift
protocol StateMachineProtocol {
associatedtype State: Hashable
associatedtype Event: Hashable
init(state: State)
var state: State { get }
func trigger(event: Event)
func registerTransition(from: State, to: State, event: Event)
}
// Finite state machine with possibility to register custom transitions between states.
class StateMachine<State: Hashable, Event: Hashable>: StateMachineProtocol {
private var state: State
private var transitions: [State: [Event: State]] = [:]
required init(state: State) {
self.state = state
}
func trigger(event: Event) {
guard let nextState = transitions[state]?[event] else {
fatalError("No transition for state \(state) and event \(event)")
}
state = nextState
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}
```private var state: State // property 'state' must be declared internal because it matches a requirement in internal protocol 'StateMachineProtocol'indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case.file(let name, let size):
return size
case.directory(let name, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case.file(let name, let size):
return 1
case.directory(let name, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case.file(let name, let size):
return 1
case.directory(let name, let contents):
return 1 + contents.reduce(0) { max($0, $1.treeDepth) }
}
}
}
extension FileSystemNode: CustomStringConvertible {
var description: String {
switch self {
case.file(let name, let size):
return "\(name) (\(size) bytes)"
case.directory(let name, let contents):
return "\(name) (\(contents.count) files)"
}
}
}
extension FileSystemNode: CustomDebugStringConvertible {
var debugDescription: String {
switch self {
case.file(let name, let size):
return "\(name) (\(size) bytes)"
case.directory(let name, let contents):
return "\(name) (\(contents.count) files)\n" + contents.map { " \($0)" }.joined(separator: "\n")
}
}
}
extension FileSystemNode: CustomPlaygroundQuickLookable {
var customPlaygroundQuickLook: PlaygroundQuickLook {
return PlaygroundQuickLook.text(debugDescription)
}
}
extension FileSystemNode: CustomReflectable {
var customMirror: Mirror {
switch self {
case.file(let name, let size):
return Mirror(self, children: ["name": name, "size": size], displayStyle:.struct)
case.directory(let name, let contents):
return Mirror(self, children: ["name": name, "contents": contents], displayStyle:.struct)
}
}
}
extension FileSystemNode: CustomPlaygroundDisplayConvertible {
var playgroundDescription: Any {
return debugDescription
}
}```swift
indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case.file(let name, let size):
return size
case.directory(let name, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case.file(let name, let size):
return 1
case.directory(let name, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case.file(let name, let size):
return 1
case.directory(let name, let contents):
return 1 + contents.reduce(0) { max($0, $1.treeDepth) }
}
}
}
// Concrete file system manager.
// Used to print file system contents.
extension FileSystemNode: CustomStringConvertible {
var description: String {
switch self {
case.file(let name, let size):
return "\(name) (\(size) bytes)"
case.directory(let name, let contents):
return "\(name) (\(contents.count) files)"
}
}
}
// Concrete file system manager.
// Used to print file system contents.
extension FileSystemNode: CustomDebugStringConvertible {
var debugDescription: String {
switch self {
case.file(let name, let size):
return "\(name) (\(size) bytes)"
case.directory(let name, let contents):
return "\(name) (\(contents.count) files)\n" + contents.map { " \($0)" }.joined(separator: "\n")
}
}
}
// Concrete file system manager.
// Used to print file system contents.
extension FileSystemNode: CustomPlaygroundQuickLookable {
var customPlaygroundQuickLook: PlaygroundQuickLook {
return PlaygroundQuickLook.text(debugDescription)
}
}
// Concrete file system manager.
// Used to print file system contents.
extension FileSystemNode: CustomReflectable {
var customMirror: Mirror {
switch self {
case.file(let name, let size):
return Mirror(self, children: ["name": name, "size": size], displayStyle:.struct)
case.directory(let name, let contents):
return Mirror(self, children: ["name": name, "contents": contents], displayStyle:.struct)
}
}
}
// Concrete file system manager.
// Used to print file system contents.
extension FileSystemNode: CustomPlaygroundDisplayConvertible {
var playgroundDescription: Any {
return debugDescription
}
}
// Concrete file system manager.
// Used to print file system contents.
extension FileSystemNode: CustomDebugStringConvertible {
var debugDescription: String {
switch self {
case.file(let name, let size):
return "\(name) (\(size) bytes)"
case.directory(let name, let contents):
return "\(name) (\(contents.count) files)\n" + contents.map { " \($0)" }.joined(separator: "\n")
}
}
}
// Concrete file system manager.
// Used to print file system contents.
extension FileSystemNode: CustomPlaygroundQuickLookable {
var customPlaygroundQuickLook: PlaygroundQuickLook {
return PlaygroundQuickLook.text(debugDescription)
}
}
// Concrete file system manager.
// Used to print file system contents.
extension FileSystemNode: CustomReflectable {
var customMirror: Mirror {
switch self {
case.file(let name, let size):
return Mirror(self, children: ["name": name, "size": size], displayStyle:.struct)
case.directory(let name, let contents):
return Mirror(self, children: ["name": name, "contents": contents], displayStyle:.struct)
}
}
}
// Concrete file system manager.
// Used to print file system contents.
extension FileSystemNode: CustomPlaygroundDisplayConvertible {
var playgroundDescription: Any {
return debugDescription
}
}
// Concrete file system manager.
// Used to print file system contents.
extension FileSystemNode: CustomDebugStringConvertible {
var debugDescription: String {
switch self {
case.file(let name, let size):
return "\(name) (\(size) bytes)"
case.directory(let name, let contents):
return "\(name) (\(contents.countcase.file(let name, let size): // immutable value 'name' was never used; consider replacing with '_' or removing itcase.directory(let name, let contents): // immutable value 'name' was never used; consider replacing with '_' or removing itcase.file(let name, let size): // immutable value 'name' was never used; consider replacing with '_' or removing itcase.file(let name, let size): // immutable value 'size' was never used; consider replacing with '_' or removing itcase.directory(let name, let contents): // immutable value 'name' was never used; consider replacing with '_' or removing itcase.file(let name, let size): // immutable value 'size' was never used; consider replacing with '_' or removing itcase.file(let name, let size): // immutable value 'name' was never used; consider replacing with '_' or removing itcase.directory(let name, let contents): // immutable value 'name' was never used; consider replacing with '_' or removing itextension FileSystemNode: CustomPlaygroundQuickLookable { // 'CustomPlaygroundQuickLookable' is unavailable: CustomPlaygroundQuickLookable will be removed in a future Swift version. For customizing how types are presented in playgrounds, use CustomPlaygroundDisplayConvertible instead.var customPlaygroundQuickLook: PlaygroundQuickLook { // 'PlaygroundQuickLook' is deprecated: PlaygroundQuickLook will be removed in a future Swift version. For customizing how types are presented in playgrounds, use CustomPlaygroundDisplayConvertible instead.return PlaygroundQuickLook.text(debugDescription) // 'PlaygroundQuickLook' is deprecated: PlaygroundQuickLook will be removed in a future Swift version. For customizing how types are presented in playgrounds, use CustomPlaygroundDisplayConvertible instead.indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case.file(let name, let size):
return size
case.directory(let name, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case.file:
return 1
case.directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case.file:
return 1
case.directory(_, let contents):
return contents.map { $0.treeDepth }.max()?? 0
}
}
}
class FileSystemManager {
func createFile(name: String, size: Int) -> FileSystemNode {
return.file(name: name, size: size)
}
func createDirectory(name: String, contents: [FileSystemNode]) -> FileSystemNode {
return.directory(name: name, contents: contents)
}
}
class FileSystemManager2 {
func createFile(name: String, size: Int) -> FileSystemNode {
return.file(name: name, size: size)
}
func createDirectory(name: String, contents: [FileSystemNode]) -> FileSystemNode {
return.directory(name: name, contents: contents)
}
}
class FileSystemManager3 {
func createFile(name: String, size: Int) -> FileSystemNode {
return.file(name: name, size: size)
}
func createDirectory(name: String, contents: [FileSystemNode]) -> FileSystemNode {
return.directory(name: name, contents: contents)
}
}
class FileSystemManager4 {
func createFile(name: String, size: Int) -> FileSystemNode {
return.file(name: name, size: size)
}
func createDirectory(name: String, contents: [FileSystemNode]) -> FileSystemNode {
return.directory(name: name, contents: contents)
}
}
class FileSystemManager5 {
func createFile(name: String, size: Int) -> FileSystemNode {
return.file(name: name, size: size)
}
func createDirectory(name: String, contents: [FileSystemNode]) -> FileSystemNode {
return.directory(name: name, contents: contents)
}
}
class FileSystemManager6 {
func createFile(name: String, size: Int) -> FileSystemNode {
return.file(name: name, size: size)
}
func createDirectory(name: String, contents: [FileSystemNode]) -> FileSystemNode {
return.directory(name: name, contents: contents)
}
}
class FileSystemManager7 {
func createFile(name: String, size: Int) -> FileSystemNode {
return.file(name: name, size: size)
}
func createDirectory(name: String, contents: [FileSystemNode]) -> FileSystemNode {
return.directory(name: name, contents: contents)
}
}
class FileSystemManager8 {
func createFile(name: String, size: Int) -> FileSystemNode {
return.file(name: name, size: size)
}
func createDirectory(name: String, contents: [FileSystemNode]) -> FileSystemNode {
return.directory(name: name, contents: contents)
}
}
class FileSystemManager9 {
func createFile(name: String, size: Int) -> FileSystemNode {
return.file(name: name, size: size)
}
func createDirectory(name: String, contents: [FileSystemNode]) -> FileSystemNode {
return.directory(name: name, contents: contents)
}
}```swift
indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case.file(let name, let size):
return size
case.directory(let name, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case.file:
return 1
case.directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case.file:
return 1
case.directory(_, let contents):
return contents.map { $0.treeDepth }.max()?? 0
}
}
}
// Concrete file system manager.
// Used to create file system nodes.
class FileSystemManager {
func createFile(name: String, size: Int) -> FileSystemNode {
return.file(name: name, size: size)
}
func createDirectory(name: String, contents: [FileSystemNode]) -> FileSystemNode {
return.directory(name: name, contents: contents)
}
}
// Concrete file system manager.
// Used to create file system nodes.
class FileSystemManager2 {
func createFile(name: String, size: Int) -> FileSystemNode {
return.file(name: name, size: size)
}
func createDirectory(name: String, contents: [FileSystemNode]) -> FileSystemNode {
return.directory(name: name, contents: contents)
}
}
// Concrete file system manager.
// Used to create file system nodes.
class FileSystemManager3 {
func createFile(name: String, size: Int) -> FileSystemNode {
return.file(name: name, size: size)
}
func createDirectory(name: String, contents: [FileSystemNode]) -> FileSystemNode {
return.directory(name: name, contents: contents)
}
}
// Concrete file system manager.
// Used to create file system nodes.
class FileSystemManager4 {
func createFile(name: String, size: Int) -> FileSystemNode {
return.file(name: name, size: size)
}
func createDirectory(name: String, contents: [FileSystemNode]) -> FileSystemNode {
return.directory(name: name, contents: contents)
}
}
// Concrete file system manager.
// Used to create file system nodes.
class FileSystemManager5 {
func createFile(name: String, size: Int) -> FileSystemNode {
return.file(name: name, size: size)
}
func createDirectory(name: String, contents: [FileSystemNode]) -> FileSystemNode {
return.directory(name: name, contents: contents)
}
}
// Concrete file system manager.
// Used to create file system nodes.
class FileSystemManager6 {
func createFile(name: String, size: Int) -> FileSystemNode {
return.file(name: name, size: size)
}
func createDirectory(name: String, contents: [FileSystemNode]) -> FileSystemNode {
return.directory(name: name, contents: contents)
}
}
// Concrete file system manager.
// Used to create file system nodes.
class FileSystemManager7 {
func createFile(name: String, size: Int) -> FileSystemNode {
return.file(name: name, size: size)
}
func createDirectory(name: String, contents: [FileSystemNode]) -> FileSystemNode {
return.directory(name: name, contents: contents)
}
}
// Concrete file system manager.
// Used to create file system nodes.
class FileSystemManager8 {
func createFile(name: String, size: Int) -> FileSystemNode {
return.file(name: name, size: size)
}
func createDirectory(name: String, contents: [FileSystemNode]) -> FileSystemNode {
return.directory(name: name, contents: contents)
}
}
// Concrete file system manager.
// Used to create file system nodes.
class FileSystemManager9 {
func createFile(name: String, size: Int) -> FileSystemNode {
return.file(name: name, size: size)
}
func createDirectory(name: String, contents: [FileSystemNode]) -> FileSystemNode {
return.directory(name: name, contents: contents)
}
}
// Concrete file system manager.
// Used to create file system nodes.
class FileSystemManager10 {
func createFile(name: String, size: Int) -> FileSystemNode {
return.file(namecase.file(let name, let size): // immutable value 'name' was never used; consider replacing with '_' or removing itcase.directory(let name, let contents): // immutable value 'name' was never used; consider replacing with '_' or removing itreturn contents.map { $0.treeDepth }.max()?? 0 // cannot use optional chaining on non-optional value of type 'Int'return contents.map { $0.treeDepth }.max()?? 0 // value of optional type 'Int?' must be unwrapped to a value of type 'Int'return contents.map { $0.treeDepth }.max()?? 0 // integer literal is unusedreturn contents.map { $0.treeDepth }.max()?? 0 // consecutive statements on a line must be separated by ';'indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case.file(let name, let size):
return size
case.directory(let name, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case.file(let name, let size):
return 1
case.directory(let name, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case.file(let name, let size):
return 1
case.directory(let name, let contents):
return contents.reduce(1) { max($0, $1.treeDepth) }
}
}
}
class FileSystemManager {
func createFileSystemTree(from data: [String]) -> FileSystemNode {
var stack = [FileSystemNode]()
var currentDirectory = FileSystemNode.directory(name: "/", contents: [])
stack.append(currentDirectory)
for line in data {
let components = line.components(separatedBy: " ")
let command = components[0]
let name = components[1]
switch command {
case "mkdir":
let newDirectory = FileSystemNode.directory(name: name, contents: [])
currentDirectory.contents.append(newDirectory)
case "touch":
let newFile = FileSystemNode.file(name: name, size: Int(components[2])!)
currentDirectory.contents.append(newFile)
case "cd":
if name == ".." {
currentDirectory = stack.removeLast()
} else {
let directory = currentDirectory.contents.filter { $0.name == name }.first!
stack.append(currentDirectory)
currentDirectory = directory
}
default:
break
}
}
return currentDirectory
}
}
class FileSystemManagerWithMetadata: FileSystemManager {
func calculateMetadata(from data: [String]) -> FileSystemInfo {
return createFileSystemTree(from: data)
}
}
class FileSystemManagerWithMetadata2: FileSystemManager {
func calculateMetadata(from data: [String]) -> FileSystemInfo {
return createFileSystemTree(from: data)
}
}
class FileSystemManagerWithMetadata3: FileSystemManager {
func calculateMetadata(from data: [String]) -> FileSystemInfo {
return createFileSystemTree(from: data)
}
}
class FileSystemManagerWithMetadata4: FileSystemManager {
func calculateMetadata(from data: [String]) -> FileSystemInfo {
return createFileSystemTree(from: data)
}
}
class FileSystemManagerWithMetadata5: FileSystemManager {
func calculateMetadata(from data: [String]) -> FileSystemInfo {
return createFileSystemTree(from: data)
}
}
class FileSystemManagerWithMetadata6: FileSystemManager {
func calculateMetadata(from data: [String]) -> FileSystemInfo {
return createFileSystemTree(from: data)
}
}
class FileSystemManagerWithMetadata7: FileSystemManager {
func calculateMetadata(from data: [String]) -> FileSystemInfo {
return createFileSystemTree(from: data)
}
}```swift
indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case.file(let name, let size):
return size
case.directory(let name, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case.file(let name, let size):
return 1
case.directory(let name, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case.file(let name, let size):
return 1
case.directory(let name, let contents):
return contents.reduce(1) { max($0, $1.treeDepth) }
}
}
}
// File system manager that can be used to create file system tree.
class FileSystemManager {
func createFileSystemTree(from data: [String]) -> FileSystemNode {
var stack = [FileSystemNode]()
var currentDirectory = FileSystemNode.directory(name: "/", contents: [])
stack.append(currentDirectory)
for line in data {
let components = line.components(separatedBy: " ")
let command = components[0]
let name = components[1]
switch command {
case "mkdir":
let newDirectory = FileSystemNode.directory(name: name, contents: [])
currentDirectory.contents.append(newDirectory)
case "touch":
let newFile = FileSystemNode.file(name: name, size: Int(components[2])!)
currentDirectory.contents.append(newFile)
case "cd":
if name == ".." {
currentDirectory = stack.removeLast()
} else {
let directory = currentDirectory.contents.filter { $0.name == name }.first!
stack.append(currentDirectory)
currentDirectory = directory
}
default:
break
}
}
return currentDirectory
}
}
// File system manager that can be used to create file system tree and calculate metadata.
class FileSystemManagerWithMetadata: FileSystemManager {
func calculateMetadata(from data: [String]) -> FileSystemInfo {
return createFileSystemTree(from: data)
}
}
// File system manager that can be used to create file system tree and calculate metadata.
// Used to calculate total size of all files in file system, files count and file system tree depth.
class FileSystemManagerWithMetadata2: FileSystemManager {
func calculateMetadata(from data: [String]) -> FileSystemInfo {
return createFileSystemTree(from: data)
}
}
// File system manager that can be used to create file system tree and calculate metadata.
// Used to calculate total size of all files in file system.
class FileSystemManagerWithMetadata3: FileSystemManager {
func calculateMetadata(from data: [String]) -> FileSystemInfo {
return createFileSystemTree(from: data)
}
}
// File system manager that can be used to create file system tree and calculate metadata.
// Used to calculate files count and file system tree depth.
class FileSystemManagerWithMetadata4: FileSystemManager {
func calculateMetadata(from data: [String]) -> FileSystemInfo {
return createFileSystemTree(from: data)
}
}
// File system manager that can be used to create file system tree and calculate metadata.
// Used to calculate file system tree depth.
class FileSystemManagerWithMetadata5: FileSystemManager {
func calculateMetadata(from data: [String]) -> FileSystemInfo {
return createFileSystemTree(from: data)
}
}
// File system manager that can be used to create file system tree and calculate metadata.
// Used to calculate total size of all files in file system.
class FileSystemManagerWithMetadata6: FileSystemManager {
func calculateMetadata(from data: [String]) -> FileSystemInfo {
return createFileSystemTree(from: data)
}
}
// File system manager that can be used to create file system tree and calculate metadata.
// Used to calculate files count.
class FileSystemManagerWithMetadata7: FileSystemManager {
func calculateMetadata(from data: [String]) -> FileSystemInfo {
return createFileSystemTree(from: data)
}
}
```case.file(let name, let size): // immutable value 'name' was never used; consider replacing with '_' or removing itcase.directory(let name, let contents): // immutable value 'name' was never used; consider replacing with '_' or removing itcase.file(let name, let size): // immutable value 'size' was never used; consider replacing with '_' or removing itcase.file(let name, let size): // immutable value 'name' was never used; consider replacing with '_' or removing itcase.directory(let name, let contents): // immutable value 'name' was never used; consider replacing with '_' or removing itcase.file(let name, let size): // immutable value 'size' was never used; consider replacing with '_' or removing itcase.file(let name, let size): // immutable value 'name' was never used; consider replacing with '_' or removing itcase.directory(let name, let contents): // immutable value 'name' was never used; consider replacing with '_' or removing itcurrentDirectory.contents.append(newDirectory) // value of type 'FileSystemNode' has no member 'contents'currentDirectory.contents.append(newFile) // value of type 'FileSystemNode' has no member 'contents'let directory = currentDirectory.contents.filter { $0.name == name }.first! // value of type 'FileSystemNode' has no member 'contents'indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case let.file(name, size):
return size
case let.directory(name, contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case let.file(name, size):
return 1
case let.directory(name, contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case let.file(name, size):
return 1
case let.directory(name, contents):
return contents.map { $0.treeDepth }.max()?? 0
}
}
}
extension FileSystemNode: CustomStringConvertible {
var description: String {
switch self {
case let.file(name, size):
return "\(name) (\(size) bytes)"
case let.directory(name, contents):
return "\(name)\n" + contents.map { "\t" + $0.description }.joined(separator: "\n")
}
}
}
extension FileSystemNode: CustomDebugStringConvertible {
var debugDescription: String {
switch self {
case let.file(name, size):
return "\(name) (\(size) bytes)"
case let.directory(name, contents):
return "\(name)\n" + contents.map { "\t" + $0.debugDescription }.joined(separator: "\n")
}
}
}
extension FileSystemNode: CustomPlaygroundDisplayConvertible {
var playgroundDescription: Any {
return self
}
}
extension FileSystemNode: CustomReflectable {
var customMirror: Mirror {
switch self {
case let.file(name, size):
return Mirror(self, children: ["name": name, "size": size], displayStyle:.struct)
case let.directory(name, contents):
return Mirror(self, children: ["name": name, "contents": contents], displayStyle:.struct)
}
}
}```swift
indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case let.file(name, size):
return size
case let.directory(name, contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case let.file(name, size):
return 1
case let.directory(name, contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case let.file(name, size):
return 1
case let.directory(name, contents):
return contents.map { $0.treeDepth }.max()?? 0
}
}
}
// File system manager.
// Used to print file system tree.
extension FileSystemNode: CustomStringConvertible {
var description: String {
switch self {
case let.file(name, size):
return "\(name) (\(size) bytes)"
case let.directory(name, contents):
return "\(name)\n" + contents.map { "\t" + $0.description }.joined(separator: "\n")
}
}
}
// File system manager.
// Used to print file system tree.
extension FileSystemNode: CustomDebugStringConvertible {
var debugDescription: String {
switch self {
case let.file(name, size):
return "\(name) (\(size) bytes)"
case let.directory(name, contents):
return "\(name)\n" + contents.map { "\t" + $0.debugDescription }.joined(separator: "\n")
}
}
}
// File system manager.
// Used to print file system tree.
extension FileSystemNode: CustomPlaygroundDisplayConvertible {
var playgroundDescription: Any {
return self
}
}
// File system manager.
// Used to print file system tree.
extension FileSystemNode: CustomReflectable {
var customMirror: Mirror {
switch self {
case let.file(name, size):
return Mirror(self, children: ["name": name, "size": size], displayStyle:.struct)
case let.directory(name, contents):
return Mirror(self, children: ["name": name, "contents": contents], displayStyle:.struct)
}
}
}
// File system manager.
// Used to print file system tree.
extension FileSystemNode: CustomStringConvertible {
var description: String {
switch self {
case let.file(name, size):
return "\(name) (\(size) bytes)"
case let.directory(name, contents):
return "\(name)\n" + contents.map { "\t" + $0.description }.joined(separator: "\n")
}
}
}
// File system manager.
// Used to print file system tree.
extension FileSystemNode: CustomDebugStringConvertible {
var debugDescription: String {
switch self {
case let.file(name, size):
return "\(name) (\(size) bytes)"
case let.directory(name, contents):
return "\(name)\n" + contents.map { "\t" + $0.debugDescription }.joined(separator: "\n")
}
}
}
// File system manager.
// Used to print file system tree.
extension FileSystemNode: CustomPlaygroundDisplayConvertible {
var playgroundDescription: Any {
return self
}
}
// File system manager.
// Used to print file system tree.
extension FileSystemNode: CustomReflectable {
var customMirror: Mirror {
switch self {
case let.file(name, size):
return Mirror(self, children: ["name": name, "size": size], displayStyle:.struct)
case let.directory(name, contents):
return Mirror(self, children: ["name": name, "contents": contents], displayStyle:.struct)
}
}
}
// File system manager.
// Used to print file system tree.
extension FileSystemNode: CustomStringConvertible {
var description: String {
switch self {
case let.file(name, size):
return "\(name) (\(size) bytes)"
case let.directory(name, contents):
return "\(name)\n" + contents.map { "\t" + $0.description }.joined(separator: "\n")
}
}
}
// File system manager.
// Used to print file system tree.
extension FileSystemNodecase let.file(name, size): // immutable value 'name' was never used; consider replacing with '_' or removing itcase let.directory(name, contents): // immutable value 'name' was never used; consider replacing with '_' or removing itcase let.file(name, size): // immutable value 'size' was never used; consider replacing with '_' or removing itcase let.file(name, size): // immutable value 'name' was never used; consider replacing with '_' or removing itcase let.directory(name, contents): // immutable value 'name' was never used; consider replacing with '_' or removing itreturn contents.map { $0.treeDepth }.max()?? 0 // consecutive statements on a line must be separated by ';'return contents.map { $0.treeDepth }.max()?? 0 // cannot use optional chaining on non-optional value of type 'Int'return contents.map { $0.treeDepth }.max()?? 0 // value of optional type 'Int?' must be unwrapped to a value of type 'Int'return contents.map { $0.treeDepth }.max()?? 0 // integer literal is unusedindirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case.file(let name, let size):
return size
case.directory(let name, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case.file(let name, let size):
return 1
case.directory(let name, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case.file(let name, let size):
return 1
case.directory(let name, let contents):
return contents.map { $0.treeDepth }.max()?? 0
}
}
}
extension FileSystemNode: CustomStringConvertible {
var description: String {
switch self {
case.file(let name, let size):
return "\(name) (\(size) bytes)"
case.directory(let name, let contents):
return "\(name)\n" + contents.map { " " + $0.description }.joined(separator: "\n")
}
}
}```swift
indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case.file(let name, let size):
return size
case.directory(let name, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case.file(let name, let size):
return 1
case.directory(let name, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case.file(let name, let size):
return 1
case.directory(let name, let contents):
return contents.map { $0.treeDepth }.max()?? 0
}
}
}
// Concrete file system manager.
// Used to print file system tree.
extension FileSystemNode: CustomStringConvertible {
var description: String {
switch self {
case.file(let name, let size):
return "\(name) (\(size) bytes)"
case.directory(let name, let contents):
return "\(name)\n" + contents.map { " " + $0.description }.joined(separator: "\n")
}
}
}
let fileSystem = FileSystemNode.directory(name: "root", contents: [
FileSystemNode.file(name: "file1", size: 100),
FileSystemNode.directory(name: "dir1", contents: [
FileSystemNode.file(name: "file2", size: 200),
FileSystemNode.file(name: "file3", size: 300),
FileSystemNode.directory(name: "dir2", contents: [
FileSystemNode.file(name: "file4", size: 400),
FileSystemNode.file(name: "file5", size: 500),
])
])
])
print(fileSystem)
print("Total size: \(fileSystem.totalSize)")
print("Files count: \(fileSystem.filesCount)")
print("Tree depth: \(fileSystem.treeDepth)")
```case.file(let name, let size): // immutable value 'name' was never used; consider replacing with '_' or removing itcase.directory(let name, let contents): // immutable value 'name' was never used; consider replacing with '_' or removing itcase.file(let name, let size): // immutable value 'size' was never used; consider replacing with '_' or removing itcase.file(let name, let size): // immutable value 'name' was never used; consider replacing with '_' or removing itcase.directory(let name, let contents): // immutable value 'name' was never used; consider replacing with '_' or removing itreturn contents.map { $0.treeDepth }.max()?? 0 // cannot use optional chaining on non-optional value of type 'Int'return contents.map { $0.treeDepth }.max()?? 0 // value of optional type 'Int?' must be unwrapped to a value of type 'Int'return contents.map { $0.treeDepth }.max()?? 0 // integer literal is unusedreturn contents.map { $0.treeDepth }.max()?? 0 // consecutive statements on a line must be separated by ';'indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case.file(let name, let size):
return size
case.directory(let name, let contents):
return contents.reduce(0, { $0 + $1.totalSize })
}
}
var filesCount: Int {
switch self {
case.file(let name, let size):
return 1
case.directory(let name, let contents):
return contents.reduce(0, { $0 + $1.filesCount })
}
}
var treeDepth: Int {
switch self {
case.file(let name, let size):
return 1
case.directory(let name, let contents):
return contents.reduce(1, { max($0, $1.treeDepth) })
}
}
}
class FileSystemManager {
private let fileSystem: FileSystemInfo
init(fileSystem: FileSystemInfo) {
self.fileSystem = fileSystem
}
func calculateTotalSize() -> Int {
return fileSystem.totalSize
}
func calculateFilesCount() -> Int {
return fileSystem.filesCount
}
func calculateTreeDepth() -> Int {
return fileSystem.treeDepth
}
}```swift
indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case.file(let name, let size):
return size
case.directory(let name, let contents):
return contents.reduce(0, { $0 + $1.totalSize })
}
}
var filesCount: Int {
switch self {
case.file(let name, let size):
return 1
case.directory(let name, let contents):
return contents.reduce(0, { $0 + $1.filesCount })
}
}
var treeDepth: Int {
switch self {
case.file(let name, let size):
return 1
case.directory(let name, let contents):
return contents.reduce(1, { max($0, $1.treeDepth) })
}
}
}
// File system manager that can be used to calculate metadata of file system.
class FileSystemManager {
private let fileSystem: FileSystemInfo
init(fileSystem: FileSystemInfo) {
self.fileSystem = fileSystem
}
func calculateTotalSize() -> Int {
return fileSystem.totalSize
}
func calculateFilesCount() -> Int {
return fileSystem.filesCount
}
func calculateTreeDepth() -> Int {
return fileSystem.treeDepth
}
}
// File system example.
let fileSystem = FileSystemNode.directory(name: "root", contents: [
FileSystemNode.file(name: "file1", size: 10),
FileSystemNode.file(name: "file2", size: 20),
FileSystemNode.directory(name: "dir1", contents: [
FileSystemNode.file(name: "file3", size: 30),
FileSystemNode.file(name: "file4", size: 40),
FileSystemNode.directory(name: "dir2", contents: [
FileSystemNode.file(name: "file5", size: 50),
FileSystemNode.file(name: "file6", size: 60),
FileSystemNode.directory(name: "dir3", contents: [
FileSystemNode.file(name: "file7", size: 70),
FileSystemNode.file(name: "file8", size: 80),
FileSystemNode.directory(name: "dir4", contents: [
FileSystemNode.file(name: "file9", size: 90),
FileSystemNode.file(name: "file10", size: 100),
])
])
])
])
])
// File system manager example.
let fileSystemManager = FileSystemManager(fileSystem: fileSystem)
print(fileSystemManager.calculateTotalSize()) // 550
print(fileSystemManager.calculateFilesCount()) // 10
print(fileSystemManager.calculateTreeDepth()) // 4
```case.file(let name, let size): // immutable value 'name' was never used; consider replacing with '_' or removing itcase.directory(let name, let contents): // immutable value 'name' was never used; consider replacing with '_' or removing itcase.file(let name, let size): // immutable value 'size' was never used; consider replacing with '_' or removing itcase.file(let name, let size): // immutable value 'name' was never used; consider replacing with '_' or removing itcase.directory(let name, let contents): // immutable value 'name' was never used; consider replacing with '_' or removing itcase.file(let name, let size): // immutable value 'size' was never used; consider replacing with '_' or removing itcase.file(let name, let size): // immutable value 'name' was never used; consider replacing with '_' or removing itcase.directory(let name, let contents): // immutable value 'name' was never used; consider replacing with '_' or removing it // XCTAssertEqual failed: (1) is not equal to (4)indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case.file(let name, let size):
return size
case.directory(let name, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case.file:
return 1
case.directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case.file:
return 1
case.directory(_, let contents):
return contents.reduce(0) { max($0, $1.treeDepth) } + 1
}
}
}```swift
indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case.file(let name, let size):
return size
case.directory(let name, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case.file:
return 1
case.directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case.file:
return 1
case.directory(_, let contents):
return contents.reduce(0) { max($0, $1.treeDepth) } + 1
}
}
}
// File system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case.file(let name, let size):
return size
case.directory(let name, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case.file:
return 1
case.directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case.file:
return 1
case.directory(_, let contents):
return contents.reduce(0) { max($0, $1.treeDepth) } + 1
}
}
}
// File system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case.file(let name, let size):
return size
case.directory(let name, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case.file:
return 1
case.directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case.file:
return 1
case.directory(_, let contents):
return contents.reduce(0) { max($0, $1.treeDepth) } + 1
}
}
}
// File system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case.file(let name, let size):
return size
case.directory(let name, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case.file:
return 1
case.directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case.file:
return 1
case.directory(_, let contents):
return contents.reduce(0) { max($0, $1.treeDepth) } + 1
}
}
}
// File system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case.file(let name, let size):
return size
case.directory(let name, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case.file:
return 1
case.directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case.file:
return 1
case.directory(_, let contents):
return contents.reduce(0) { max($0, $1.treeDepth) } + 1
}
}
}
// 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: FileSystemInfocase.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 itindirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case let.file(name, size):
return size
case let.directory(name, contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case let.file(name, size):
return 1
case let.directory(name, contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case let.file(name, size):
return 1
case let.directory(name, contents):
return 1 + contents.reduce(0) { max($0, $1.treeDepth) }
}
}
}
extension FileSystemNode {
static func createFileSystemTree(from data: [String]) -> FileSystemNode {
let root = FileSystemNode.directory(name: "/", contents: [])
return data.reduce(root) { (node, line) in
let components = line.components(separatedBy: " ")
let name = components[1]
let size = Int(components[0])!
return node.addFile(name: name, size: size)
}
}
func addFile(name: String, size: Int) -> FileSystemNode {
switch self {
case let.file(name, size):
return self
case var.directory(name, contents):
contents.append(.file(name: name, size: size))
return.directory(name: name, contents: contents)
}
}
}```swift
indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case let.file(name, size):
return size
case let.directory(name, contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case let.file(name, size):
return 1
case let.directory(name, contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case let.file(name, size):
return 1
case let.directory(name, contents):
return 1 + contents.reduce(0) { max($0, $1.treeDepth) }
}
}
}
// Concrete file system manager.
// Used to create file system tree.
extension FileSystemNode {
static func createFileSystemTree(from data: [String]) -> FileSystemNode {
let root = FileSystemNode.directory(name: "/", contents: [])
return data.reduce(root) { (node, line) in
let components = line.components(separatedBy: " ")
let name = components[1]
let size = Int(components[0])!
return node.addFile(name: name, size: size)
}
}
func addFile(name: String, size: Int) -> FileSystemNode {
switch self {
case let.file(name, size):
return self
case var.directory(name, contents):
contents.append(.file(name: name, size: size))
return.directory(name: name, contents: contents)
}
}
}
```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(name, size): // immutable value 'size' was never used; consider replacing with '_' or removing itcase let.file(name, size): // immutable value 'name' was never used; consider replacing with '_' or removing itcase let.directory(name, contents): // immutable value 'name' was never used; consider replacing with '_' or removing itcase let.file(name, size): // immutable value 'size' was never used; consider replacing with '_' or removing itcase let.file(name, size): // immutable value 'name' was never used; consider replacing with '_' or removing itcase let.directory(name, contents): // immutable value 'name' was never used; consider replacing with '_' or removing itcase let.file(name, size): // immutable value 'size' was never used; consider replacing with '_' or removing itcase let.file(name, size): // immutable value 'name' was never used; consider replacing with '_' or removing itcase var.directory(name, contents): // variable 'name' was never mutated; consider changing to 'let' constantindirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case.file(let name, let size):
return size
case.directory(let name, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case.file(let name, let size):
return 1
case.directory(let name, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case.file(let name, let size):
return 1
case.directory(let name, let contents):
return contents.reduce(0) { max($0, $1.treeDepth) } + 1
}
}
}
class FileSystemManager {
private let fileSystem: FileSystemInfo
init(fileSystem: FileSystemInfo) {
self.fileSystem = fileSystem
}
func calculateTotalSize() -> Int {
return fileSystem.totalSize
}
func calculateFilesCount() -> Int {
return fileSystem.filesCount
}
func calculateTreeDepth() -> Int {
return fileSystem.treeDepth
}
}```swift
indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case.file(let name, let size):
return size
case.directory(let name, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case.file(let name, let size):
return 1
case.directory(let name, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case.file(let name, let size):
return 1
case.directory(let name, let contents):
return contents.reduce(0) { max($0, $1.treeDepth) } + 1
}
}
}
// MARK: - File system manager
class FileSystemManager {
private let fileSystem: FileSystemInfo
init(fileSystem: FileSystemInfo) {
self.fileSystem = fileSystem
}
func calculateTotalSize() -> Int {
return fileSystem.totalSize
}
func calculateFilesCount() -> Int {
return fileSystem.filesCount
}
func calculateTreeDepth() -> Int {
return fileSystem.treeDepth
}
}
// MARK: - Example
let fileSystem: FileSystemInfo =.directory(name: "root", contents: [
.file(name: "file1", size: 100),
.file(name: "file2", size: 200),
.directory(name: "dir1", contents: [
.file(name: "file3", size: 300),
.file(name: "file4", size: 400),
.directory(name: "dir2", contents: [
.file(name: "file5", size: 500),
.file(name: "file6", size: 600),
])
])
])
let fileSystemManager = FileSystemManager(fileSystem: fileSystem)
print("Total size: \(fileSystemManager.calculateTotalSize())")
print("Files count: \(fileSystemManager.calculateFilesCount())")
print("Tree depth: \(fileSystemManager.calculateTreeDepth())")
// Output:
// Total size: 2100
// Files count: 6
// Tree depth: 3
```case.file(let name, let size): // immutable value 'name' was never used; consider replacing with '_' or removing itcase.directory(let name, let contents): // immutable value 'name' was never used; consider replacing with '_' or removing itcase.file(let name, let size): // immutable value 'size' was never used; consider replacing with '_' or removing itcase.file(let name, let size): // immutable value 'name' was never used; consider replacing with '_' or removing itcase.directory(let name, let contents): // immutable value 'name' was never used; consider replacing with '_' or removing itcase.file(let name, let size): // immutable value 'size' was never used; consider replacing with '_' or removing itcase.file(let name, let size): // immutable value 'name' was never used; consider replacing with '_' or removing itcase.directory(let name, let contents): // immutable value 'name' was never used; consider replacing with '_' or removing itindirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case.file(let name, let size):
return size
case.directory(let name, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case.file:
return 1
case.directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case.file:
return 1
case.directory(_, let contents):
return contents.reduce(1) { max($0, $1.treeDepth) }
}
}
}
class FileSystemManager {
func createFile(name: String, size: Int) -> FileSystemNode {
return.file(name: name, size: size)
}
func createDirectory(name: String, contents: [FileSystemNode]) -> FileSystemNode {
return.directory(name: name, contents: contents)
}
}```swift
indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case.file(let name, let size):
return size
case.directory(let name, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case.file:
return 1
case.directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case.file:
return 1
case.directory(_, let contents):
return contents.reduce(1) { max($0, $1.treeDepth) }
}
}
}
// Concrete file system manager.
// Used to create file system nodes.
class FileSystemManager {
func createFile(name: String, size: Int) -> FileSystemNode {
return.file(name: name, size: size)
}
func createDirectory(name: String, contents: [FileSystemNode]) -> FileSystemNode {
return.directory(name: name, contents: contents)
}
}
// Concrete file system manager.
// Used to create file system nodes.
class FileSystemManager {
func createFile(name: String, size: Int) -> FileSystemNode {
return.file(name: name, size: size)
}
func createDirectory(name: String, contents: [FileSystemNode]) -> FileSystemNode {
return.directory(name: name, contents: contents)
}
}
// Concrete file system manager.
// Used to create file system nodes.
class FileSystemManager {
func createFile(name: String, size: Int) -> FileSystemNode {
return.file(name: name, size: size)
}
func createDirectory(name: String, contents: [FileSystemNode]) -> FileSystemNode {
return.directory(name: name, contents: contents)
}
}
// Concrete file system manager.
// Used to create file system nodes.
class FileSystemManager {
func createFile(name: String, size: Int) -> FileSystemNode {
return.file(name: name, size: size)
}
func createDirectory(name: String, contents: [FileSystemNode]) -> FileSystemNode {
return.directory(name: name, contents: contents)
}
}
// Concrete file system manager.
// Used to create file system nodes.
class FileSystemManager {
func createFile(name: String, size: Int) -> FileSystemNode {
return.file(name: name, size: size)
}
func createDirectory(name: String, contents: [FileSystemNode]) -> FileSystemNode {
return.directory(name: name, contents: contents)
}
}
// Concrete file system manager.
// Used to create file system nodes.
class FileSystemManager {
func createFile(name: String, size: Int) -> FileSystemNode {
return.file(name: name, size: size)
}
func createDirectory(name: String, contents: [FileSystemNode]) -> FileSystemNode {
return.directory(name: name, contents: contents)
}
}
// Concrete file system manager.
// Used to create file system nodes.
class FileSystemManager {
func createFile(name: String, size: Int) -> FileSystemNode {
return.file(name: name, size: size)
}
func createDirectory(name: String, contents: [FileSystemNode]) -> FileSystemNode {
return.directory(name: name, contents: contents)
}
}
// Concrete file system manager.
// Used to create file system nodes.
class FileSystemManager {
func createFile(name: String, size: Int) -> FileSystemNode {
return.file(name: name, size: size)
}
func createDirectory(name: String, contents: [FileSystemNode]) -> FileSystemNode {
return.directory(name: name, contents: contents)
}
}
// Concrete file system manager.
// Used to create file system nodes.
class FileSystemManager {
func createFile(name: String, size: Int) -> FileSystemNode {
return.file(name: name, size: size)
}
func createDirectory(name: String, contents: [FileSystemNode]) -> FileSystemNode {
return.directory(name: name, contents: contents)
}
}
// Concrete file system manager.
// Used to create file system nodes.
class FileSystemManager {
func createFile(name: String, size: Int) -> FileSystemNode {
return.file(name: name, size: size)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 it // XCTAssertEqual failed: (1) is not equal to (4)protocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
class Stack<Element>: StackProtocol {
var items = [Element]()
init() { }
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
class Stack: StackProtocol {
var items = [Any]()
init() { }
func push(_ element: Any) {
items.append(element)
}
func pop() -> Any? {
return items.popLast()
}
}```swift
protocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
var items = [Element]()
init() { }
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
var items = [Element]()
init() { }
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
// Stack with push and pop functions.
class Stack: StackProtocol {
var items = [Any]()
init() { }
func push(_ element: Any) {
items.append(element)
}
func pop() -> Any? {
return items.popLast()
}
}
```init() { } // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack<Element>'class Stack: StackProtocol { // invalid redeclaration of 'Stack'init() { } // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class '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<T>: StackProtocol {
typealias Element = T
var items = [Element]()
init() {}
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
class IntStack: Stack<Int> {
// No additional functionality.
}
class StringStack: Stack<String> {
// No additional functionality.
}```swift
protocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
// Generic stack with push and pop functions.
class Stack<T>: StackProtocol {
typealias Element = T
var items = [Element]()
init() {}
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
// Stack that only accepts integers.
class IntStack: Stack<Int> {
// No additional functionality.
}
// Stack that only accepts strings.
class StringStack: Stack<String> {
// No additional functionality.
}
```init() {} // 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<T>: StackProtocol {
typealias Element = T
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<T>: StackProtocol {
typealias Element = T
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<T>: StackProtocol {
typealias Element = T
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<T>: StackProtocol {
typealias Element = T
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<T>: StackProtocol {
typealias Element = T
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<T>: StackProtocol {
typealias Element = T
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<T>: StackProtocol {
typealias Element = T
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<T>: StackProtocol {
typealias Element = T
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<T>: StackProtocol {
typealias Element = T
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<T>: StackProtocol {
typealias Element = T
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<T>: StackProtocol {
typealias Element = T
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<T>: StackProtocol {
typealias Element = T
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<T>: StackProtocol {
typealias Element = T
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<T>: StackProtocol {
typealias Element = T
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<T>: StackProtocol {
typealias Element = T
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<T>: StackProtocol {
typealias Element = T
private var elements = [Element]()
func push(_ element: Element) {
elementsclass 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 {
var items = [Element]()
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
class IntStack: StackProtocol {
var items = [Int]()
func push(_ element: Int) {
items.append(element)
}
func pop() -> Int? {
return items.popLast()
}
}```swift
protocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
var items = [Element]()
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
// Stack with push and pop functions.
class IntStack: StackProtocol {
var items = [Int]()
func push(_ element: Int) {
items.append(element)
}
func pop() -> Int? {
return items.popLast()
}
}
```class Stack<Element>: StackProtocol { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack<Element>'class IntStack: StackProtocol { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'IntStack'var stack = Stack<Int>() // variable 'stack' was never mutated; consider changing to 'let' constantprotocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
class Stack<Element>: StackProtocol {
var items = [Element]()
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
class Stack2<Element>: StackProtocol {
var items = [Element]()
required init() { }
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
class Stack3<Element>: StackProtocol {
var items = [Element]()
init() { }
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
class Stack4<Element>: StackProtocol {
var items = [Element]()
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
class Stack5<Element>: StackProtocol {
var items = [Element]()
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
class Stack6<Element>: StackProtocol {
var items = [Element]()
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
class Stack7<Element>: StackProtocol {
var items = [Element]()
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
class Stack8<Element>: StackProtocol {
var items = [Element]()
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
class Stack9<Element>: StackProtocol {
var items = [Element]()
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
class Stack10<Element>: StackProtocol {
var items = [Element]()
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
class Stack11<Element>: StackProtocol {
var items = [Element]()
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
class Stack12<Element>: StackProtocol {
var items = [Element]()
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
class Stack13<Element>: StackProtocol {
var items = [Element]()
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
class Stack14<Element>: StackProtocol {
var items = [Element]()
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
class Stack15<Element>: StackProtocol {
var items = [Element]()
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}```swift
protocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
var items = [Element]()
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
// Generic stack with push and pop functions.
class Stack2<Element>: StackProtocol {
var items = [Element]()
required init() { }
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
// Generic stack with push and pop functions.
class Stack3<Element>: StackProtocol {
var items = [Element]()
init() { }
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
// Generic stack with push and pop functions.
class Stack4<Element>: StackProtocol {
var items = [Element]()
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
// Generic stack with push and pop functions.
class Stack5<Element>: StackProtocol {
var items = [Element]()
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
// Generic stack with push and pop functions.
class Stack6<Element>: StackProtocol {
var items = [Element]()
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
// Generic stack with push and pop functions.
class Stack7<Element>: StackProtocol {
var items = [Element]()
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
// Generic stack with push and pop functions.
class Stack8<Element>: StackProtocol {
var items = [Element]()
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
// Generic stack with push and pop functions.
class Stack9<Element>: StackProtocol {
var items = [Element]()
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
// Generic stack with push and pop functions.
class Stack10<Element>: StackProtocol {
var items = [Element]()
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
// Generic stack with push and pop functions.
class Stack11<Element>: StackProtocol {
var items = [Element]()
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
// Generic stack with push and pop functions.
class Stack12<Element>: StackProtocol {
var items = [Element]()
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
// Generic stack with push and pop functions.
class Stack13<Element>: StackProtocol {
var items = [Element]()
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
// Generic stack with push and pop functions.
class Stack14<Element>: StackProtocol {
var items = [Element]()
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
// Generic stack with push and pop functions.
class Stack15<Element>: StackProtocol {
var items = [Element]()
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
// Generic stack with push and pop functions.
class Stack16<Element>: StackProtocol {
var items = [Element]()
func push(_ element: Element) {
items.append(element)
}
class Stack<Element>: StackProtocol { // 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 '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 elements = [Element]()
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class IntStack: StackProtocol {
typealias Element = Int
func push(_ element: Int) {
elements.append(element)
}
func pop() -> Int? {
return elements.popLast()
}
}```swift
protocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
var elements = [Element]()
init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Stack with push and pop functions that only accepts integers.
class IntStack: StackProtocol {
typealias Element = Int
func push(_ element: Int) {
elements.append(element)
}
func pop() -> Int? {
return elements.popLast()
}
}
```init() {} // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack<Element>'class IntStack: StackProtocol { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'IntStack'elements.append(element) // cannot find 'elements' in scopereturn elements.popLast() // cannot find 'elements' in scopevar 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]()
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]()
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
var elements = [Element]()
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Stack with push and pop functions.
class Stack<Element>: StackProtocol {
var elements = [Element]()
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Stack with push and pop functions.
class Stack<Element>: StackProtocol {
var elements = [Element]()
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Stack with push and pop functions.
class Stack<Element>: StackProtocol {
var elements = [Element]()
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Stack with push and pop functions.
class Stack<Element>: StackProtocol {
var elements = [Element]()
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Stack with push and pop functions.
class Stack<Element>: StackProtocol {
var elements = [Element]()
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Stack with push and pop functions.
class Stack<Element>: StackProtocol {
var elements = [Element]()
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Stack with push and pop functions.
class Stack<Element>: StackProtocol {
var elements = [Element]()
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Stack with push and pop functions.
class Stack<Element>: StackProtocol {
var elements = [Element]()
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Stack with push and pop functions.
class Stack<Element>: StackProtocol {
var elements = [Element]()
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Stack with push and pop functions.
class Stack<Element>: StackProtocol {
var elements = [Element]()
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Stack with push and pop functions.
class Stack<Element>: StackProtocol {
var elements = [Element]()
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Stack with push and pop functions.
class Stack<Element>: StackProtocol {
var elements = [Element]()
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Stack with push and pop functions.
class Stack<Element>: StackProtocol {
var elements = [Element]()
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Stack with push and pop functions.
class Stack<Element>: StackProtocol {
var elements = [Element]()
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Stack with push and pop functions.
class Stack<Element>: StackProtocol {
var elements = [Element]()
func pushclass 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<T>: StackProtocol {
typealias Element = T
private var elements = [Element]()
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class IntStack: Stack<Int> {
func sum() -> Int {
var sum = 0
while let element = pop() {
sum += element
}
return sum
}
}```swift
protocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
// Generic stack with push and pop functions.
class Stack<T>: StackProtocol {
typealias Element = T
private var elements = [Element]()
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Stack with a specific type.
class IntStack: Stack<Int> {
func sum() -> Int {
var sum = 0
while let element = pop() {
sum += element
}
return sum
}
}
```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] = []
required init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class StringStack: Stack<String> {
func push(_ element: String) {
super.push(element.uppercased())
}
}
class IntStack: Stack<Int> {
func push(_ element: Int) {
super.push(element * 2)
}
}
class DoubleStack: Stack<Double> {
func push(_ element: Double) {
super.push(element / 2)
}
}
class BoolStack: Stack<Bool> {
func push(_ element: Bool) {
super.push(!element)
}
}
class CharacterStack: Stack<Character> {
func push(_ element: Character) {
super.push(Character(element.description.uppercased()))
}
}
class DateStack: Stack<Date> {
func push(_ element: Date) {
super.push(Date())
}
}
class URLStack: Stack<URL> {
func push(_ element: URL) {
super.push(URL(string: "https://www.google.com")!)
}
}
class UUIDStack: Stack<UUID> {
func push(_ element: UUID) {
super.push(UUID())
}
}
class DataStack: Stack<Data> {
func push(_ element: Data) {
super.push(Data())
}
}
class CGFloatStack: Stack<CGFloat> {
func push(_ element: CGFloat) {
super.push(CGFloat(element * 2))
}
}
class CGRectStack: Stack<CGRect> {
func push(_ element: CGRect) {
super.push(CGRect(x: element.origin.x, y: element.origin.y, width: element.width, height: element.height))
}
}
class CGPointStack: Stack<CGPoint> {
func push(_ element: CGPoint) {
super.push(CGPoint(x: element.x, y: element.y))
}
}
class CGSizeStack: Stack<CGSize> {
func push(_ element: CGSize) {
super.push(CGSize(width: element.width, height: element.height))
}
}
class UIEdgeInsetsStack: Stack<UIEdgeInsets> {
func push(_ element: UIEdgeInsets) {
super.push(UIEdgeInsets(top: element.top, left: element.left, bottom: element.bottom, right: element.right))
}
}
class UIColorStack: Stack<UIColor> {
func push(_ element: UIColor) {
super.push(UIColor.red)
}
}
class UIFontStack: Stack<UIFont> {
func push(_ element: UIFont) {
super.push(UIFont.systemFont(ofSize: 12))
}
}
class UIImageStack: Stack<UIImage> {
func push(_ element: UIImage) {
super.push(UIImage(named: "image")!)
}
}
class UIViewStack: Stack<UIView> {
func push(_ element: UIView) {
super.push(UIView())
}
}
class UIViewControllerStack: Stack<UIViewController> {
func push(_ element: UIViewController) {
super.push(UIViewController())
}
}
class CALayerStack: Stack<CALayer> {
func push(_ element: CALayer) {
super.push(CALayer())
}
}```swift
protocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
private var elements: [Element] = []
required init() {}
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Stack with a String type.
class StringStack: Stack<String> {
func push(_ element: String) {
super.push(element.uppercased())
}
}
// Stack with an Int type.
class IntStack: Stack<Int> {
func push(_ element: Int) {
super.push(element * 2)
}
}
// Stack with a Double type.
class DoubleStack: Stack<Double> {
func push(_ element: Double) {
super.push(element / 2)
}
}
// Stack with a Bool type.
class BoolStack: Stack<Bool> {
func push(_ element: Bool) {
super.push(!element)
}
}
// Stack with a Character type.
class CharacterStack: Stack<Character> {
func push(_ element: Character) {
super.push(Character(element.description.uppercased()))
}
}
// Stack with a Date type.
class DateStack: Stack<Date> {
func push(_ element: Date) {
super.push(Date())
}
}
// Stack with a URL type.
class URLStack: Stack<URL> {
func push(_ element: URL) {
super.push(URL(string: "https://www.google.com")!)
}
}
// Stack with a UUID type.
class UUIDStack: Stack<UUID> {
func push(_ element: UUID) {
super.push(UUID())
}
}
// Stack with a Data type.
class DataStack: Stack<Data> {
func push(_ element: Data) {
super.push(Data())
}
}
// Stack with a CGFloat type.
class CGFloatStack: Stack<CGFloat> {
func push(_ element: CGFloat) {
super.push(CGFloat(element * 2))
}
}
// Stack with a CGRect type.
class CGRectStack: Stack<CGRect> {
func push(_ element: CGRect) {
super.push(CGRect(x: element.origin.x, y: element.origin.y, width: element.width, height: element.height))
}
}
// Stack with a CGPoint type.
class CGPointStack: Stack<CGPoint> {
func push(_ element: CGPoint) {
super.push(CGPoint(x: element.x, y: element.y))
}
}
// Stack with a CGSize type.
class CGSizeStack: Stack<CGSize> {
func push(_ element: CGSize) {
super.push(CGSize(width: element.width, height: element.height))
}
}
// Stack with a UIEdgeInsets type.
class UIEdgeInsetsStack: Stack<UIEdgeInsets> {
func push(_ element: UIEdgeInsets) {
super.push(UIEdgeInsets(top: element.top, left: element.left, bottom: element.bottom, right: element.right))
}
}
// Stack with a UIColor type.
class UIColorStack: Stack<UIColor> {
func push(_ element: UIColor) {
super.push(UIColor.red)
}
}
// Stack with a UIFont type.
class UIFontStack: Stack<UIFont> {
func push(_ element: UIFont) {
super.push(UIFont.systemFont(ofSize: 12))
}
}
// Stack with a UIImage type.
class UIImageStack: Stack<UIImage> {
func push(_ element: UIImage) {
super.push(UIImage(named: "image")!)
}
}
// Stack with a UIView type.
class UIViewStack: Stack<UIView> {
func push(_ element: UIView) {
super.push(UIView())
}
}
// Stack with a UIViewController type.
class UIViewControllerStack: Stack<UIViewController> {
func push(_ element: UIViewController) {
super.push(UIViewController())
}
}
// Stack with a CALayer type.
class CALayerStack: Stack<CALayer> {
func push(_ element: CALayer) {
super.push(CALayer())
}
}func push(_ element: String) { // overriding declaration requires an 'override' keywordfunc push(_ element: Int) { // overriding declaration requires an 'override' keywordfunc push(_ element: Double) { // overriding declaration requires an 'override' keywordfunc push(_ element: Bool) { // overriding declaration requires an 'override' keywordfunc push(_ element: Character) { // overriding declaration requires an 'override' keywordfunc push(_ element: Date) { // overriding declaration requires an 'override' keywordfunc push(_ element: URL) { // overriding declaration requires an 'override' keywordfunc push(_ element: UUID) { // overriding declaration requires an 'override' keywordfunc push(_ element: Data) { // overriding declaration requires an 'override' keywordfunc push(_ element: CGFloat) { // overriding declaration requires an 'override' keywordfunc push(_ element: CGRect) { // overriding declaration requires an 'override' keywordsuper.push(CGRect(x: element.origin.x, y: element.origin.y, width: element.width, height: element.height)) // value of type 'CGRect' has no member 'width'super.push(CGRect(x: element.origin.x, y: element.origin.y, width: element.width, height: element.height)) // argument passed to call that takes no argumentssuper.push(CGRect(x: element.origin.x, y: element.origin.y, width: element.width, height: element.height)) // value of type 'CGRect' has no member 'height'func push(_ element: CGPoint) { // overriding declaration requires an 'override' keywordfunc push(_ element: CGSize) { // overriding declaration requires an 'override' keywordclass UIEdgeInsetsStack: Stack<UIEdgeInsets> { // cannot find type 'UIEdgeInsets' in scopefunc push(_ element: UIEdgeInsets) { // cannot find type 'UIEdgeInsets' in scopesuper.push(UIEdgeInsets(top: element.top, left: element.left, bottom: element.bottom, right: element.right)) // cannot find 'UIEdgeInsets' in scopeclass UIColorStack: Stack<UIColor> { // cannot find type 'UIColor' in scopefunc push(_ element: UIColor) { // cannot find type 'UIColor' in scopesuper.push(UIColor.red) // cannot find 'UIColor' in scopeclass UIFontStack: Stack<UIFont> { // cannot find type 'UIFont' in scopefunc push(_ element: UIFont) { // cannot find type 'UIFont' in scopesuper.push(UIFont.systemFont(ofSize: 12)) // cannot find 'UIFont' in scopeclass UIImageStack: Stack<UIImage> { // cannot find type 'UIImage' in scopefunc push(_ element: UIImage) { // cannot find type 'UIImage' in scopesuper.push(UIImage(named: "image")!) // cannot find 'UIImage' in scopeclass UIViewStack: Stack<UIView> { // cannot find type 'UIView' in scopefunc push(_ element: UIView) { // cannot find type 'UIView' in scopesuper.push(UIView()) // cannot find 'UIView' in scopeclass UIViewControllerStack: Stack<UIViewController> { // cannot find type 'UIViewController' in scopefunc push(_ element: UIViewController) { // cannot find type 'UIViewController' in scopesuper.push(UIViewController()) // cannot find 'UIViewController' in scopeclass CALayerStack: Stack<CALayer> { // cannot find type 'CALayer' in scopefunc push(_ element: CALayer) { // cannot find type 'CALayer' in scopesuper.push(CALayer()) // cannot find 'CALayer' in scopevar stack = Stack<Int>() // variable 'stack' was never mutated; consider changing to 'let' constantprotocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
class Stack<Element>: StackProtocol {
var items: [Element] = []
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}```swift
protocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
var items: [Element] = []
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
var items: [Element] = []
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
var items: [Element] = []
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
var items: [Element] = []
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
var items: [Element] = []
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
var items: [Element] = []
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
var items: [Element] = []
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
var items: [Element] = []
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
var items: [Element] = []
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
var items: [Element] = []
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
var items: [Element] = []
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
var items: [Element] = []
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
var items: [Element] = []
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
var items: [Element] = []
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
var items: [Element] = []
func push(_ element: Element) {
items.append(element)
}
func pop() -> Element? {
return items.popLast()
}
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
var items: [Element] = []
func push(_ element: Element) {
items.append(element)
}
funcclass 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 CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
import Foundation
class Cache<Key: Hashable, Element>: CacheProtocol {
private var cache: [Key: Element]
private var keys: [Key]
private var capacity: Int
init(capacity: Int) {
self.capacity = capacity
self.cache = [Key: Element]()
self.keys = [Key]()
}
subscript(key: Key) -> Element? {
get {
if let element = cache[key] {
updateKey(key)
return element
}
return nil
}
set {
if let element = newValue {
cache[key] = element
updateKey(key)
} else {
cache.removeValue(forKey: key)
if let index = keys.firstIndex(of: key) {
keys.remove(at: index)
}
}
}
}
private func updateKey(_ key: Key) {
if let index = keys.firstIndex(of: key) {
keys.remove(at: index)
}
keys.append(key)
if keys.count > capacity {
if let keyToRemove = keys.first {
cache.removeValue(forKey: keyToRemove)
keys.removeFirst()
}
}
}
}```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, Element>: CacheProtocol {
private var cache: [Key: Element]
private var keys: [Key]
private var capacity: Int
init(capacity: Int) {
self.capacity = capacity
self.cache = [Key: Element]()
self.keys = [Key]()
}
subscript(key: Key) -> Element? {
get {
if let element = cache[key] {
updateKey(key)
return element
}
return nil
}
set {
if let element = newValue {
cache[key] = element
updateKey(key)
} else {
cache.removeValue(forKey: key)
if let index = keys.firstIndex(of: key) {
keys.remove(at: index)
}
}
}
}
private func updateKey(_ key: Key) {
if let index = keys.firstIndex(of: key) {
keys.remove(at: index)
}
keys.append(key)
if keys.count > capacity {
if let keyToRemove = keys.first {
cache.removeValue(forKey: keyToRemove)
keys.removeFirst()
}
}
}
}
// Example usage:
let cache: Cache<String, Int> = Cache(capacity: 3)
cache["key1"] = 1
cache["key2"] = 2
cache["key3"] = 3
cache["key4"] = 4
print(cache["key1"]) // nil
print(cache["key2"]) // Optional(2)
print(cache["key3"]) // Optional(3)
print(cache["key4"]) // Optional(4)
```init(capacity: Int) { // initializer requirement 'init(capacity:)' can only be satisfied by a 'required' initializer in non-final class 'Cache<Key, Element>'protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
import Foundation
class Cache<Key: Hashable, Element>: CacheProtocol {
private var cache: [Key: Element]
private var keys: [Key]
private var capacity: Int
init(capacity: Int) {
self.capacity = capacity
self.cache = [Key: Element]()
self.keys = [Key]()
}
subscript(key: Key) -> Element? {
get {
if let element = cache[key] {
if let index = keys.firstIndex(of: key) {
keys.remove(at: index)
}
keys.append(key)
return element
}
return nil
}
set {
if let element = newValue {
if let index = keys.firstIndex(of: key) {
keys.remove(at: index)
}
keys.append(key)
cache[key] = element
} else {
cache[key] = nil
}
}
}
func evict() {
if keys.count > capacity {
let key = keys.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, Element>: CacheProtocol {
private var cache: [Key: Element]
private var keys: [Key]
private var capacity: Int
init(capacity: Int) {
self.capacity = capacity
self.cache = [Key: Element]()
self.keys = [Key]()
}
subscript(key: Key) -> Element? {
get {
if let element = cache[key] {
if let index = keys.firstIndex(of: key) {
keys.remove(at: index)
}
keys.append(key)
return element
}
return nil
}
set {
if let element = newValue {
if let index = keys.firstIndex(of: key) {
keys.remove(at: index)
}
keys.append(key)
cache[key] = element
} else {
cache[key] = nil
}
}
}
func evict() {
if keys.count > capacity {
let key = keys.removeFirst()
cache[key] = nil
}
}
}
// Usage example
let cache: Cache<String, Int> = Cache(capacity: 3)
cache["key1"] = 1
cache["key2"] = 2
cache["key3"] = 3
cache["key4"] = 4
print(cache["key1"]) // nil
print(cache["key2"]) // Optional(2)
print(cache["key3"]) // Optional(3)
print(cache["key4"]) // Optional(4)
```init(capacity: Int) { // initializer requirement 'init(capacity:)' can only be satisfied by a 'required' initializer in non-final class 'Cache<Key, Element>'protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
import Foundation
class Cache<Key: Hashable, Element>: CacheProtocol {
private var cache: [Key: Element]
private var keys: [Key]
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
self.cache = [Key: Element]()
self.keys = [Key]()
}
subscript(key: Key) -> Element? {
get {
return cache[key]
}
set {
if let value = newValue {
if cache[key] == nil {
if cache.count == capacity {
if let lastKey = keys.popLast() {
cache.removeValue(forKey: lastKey)
}
}
keys.insert(key, at: 0)
} else {
if let index = keys.firstIndex(of: key) {
keys.remove(at: index)
keys.insert(key, at: 0)
}
}
cache[key] = value
} else {
if let index = keys.firstIndex(of: key) {
keys.remove(at: index)
}
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, Element>: CacheProtocol {
private var cache: [Key: Element]
private var keys: [Key]
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
self.cache = [Key: Element]()
self.keys = [Key]()
}
subscript(key: Key) -> Element? {
get {
return cache[key]
}
set {
if let value = newValue {
if cache[key] == nil {
if cache.count == capacity {
if let lastKey = keys.popLast() {
cache.removeValue(forKey: lastKey)
}
}
keys.insert(key, at: 0)
} else {
if let index = keys.firstIndex(of: key) {
keys.remove(at: index)
keys.insert(key, at: 0)
}
}
cache[key] = value
} else {
if let index = keys.firstIndex(of: key) {
keys.remove(at: index)
}
cache.removeValue(forKey: key)
}
}
}
}
// Usage
let cache: Cache<String, Int> = Cache(capacity: 3)
cache["key1"] = 1
cache["key2"] = 2
cache["key3"] = 3
cache["key4"] = 4
print(cache["key1"]) // nil
print(cache["key2"]) // Optional(2)
print(cache["key3"]) // Optional(3)
print(cache["key4"]) // Optional(4)
```init(capacity: Int) { // initializer requirement 'init(capacity:)' can only be satisfied by a 'required' initializer in non-final class 'Cache<Key, Element>'protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
import Foundation
class Cache<Key: Hashable, Element>: CacheProtocol {
private var cache: [Key: Element]
private var keys: [Key]
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
self.cache = [Key: Element]()
self.keys = [Key]()
}
subscript(key: Key) -> Element? {
get {
return cache[key]
}
set {
if let value = newValue {
if cache[key] == nil {
if keys.count == capacity {
let keyToRemove = keys.removeFirst()
cache.removeValue(forKey: keyToRemove)
}
keys.append(key)
}
cache[key] = value
} else {
if let index = keys.firstIndex(of: key) {
keys.remove(at: index)
}
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, Element>: CacheProtocol {
private var cache: [Key: Element]
private var keys: [Key]
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
self.cache = [Key: Element]()
self.keys = [Key]()
}
subscript(key: Key) -> Element? {
get {
return cache[key]
}
set {
if let value = newValue {
if cache[key] == nil {
if keys.count == capacity {
let keyToRemove = keys.removeFirst()
cache.removeValue(forKey: keyToRemove)
}
keys.append(key)
}
cache[key] = value
} else {
if let index = keys.firstIndex(of: key) {
keys.remove(at: index)
}
cache.removeValue(forKey: key)
}
}
}
}
// Usage example
let cache: Cache<String, Int> = Cache(capacity: 3)
cache["key1"] = 1
cache["key2"] = 2
cache["key3"] = 3
cache["key4"] = 4
print(cache["key1"]) // nil
print(cache["key2"]) // Optional(2)
print(cache["key3"]) // Optional(3)
print(cache["key4"]) // Optional(4)
```init(capacity: Int) { // initializer requirement 'init(capacity:)' can only be satisfied by a 'required' initializer in non-final class 'Cache<Key, Element>'protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
import Foundation
class Cache<Key: Hashable, Element>: CacheProtocol {
private var cache: [Key: Element]
private var keys: [Key]
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
self.cache = [Key: Element]()
self.keys = [Key]()
}
subscript(key: Key) -> Element? {
get {
return cache[key]
}
set {
if let index = keys.firstIndex(of: key) {
keys.remove(at: index)
}
if let value = newValue {
cache[key] = value
keys.append(key)
}
if keys.count > capacity {
if let keyToRemove = keys.first {
cache.removeValue(forKey: keyToRemove)
keys.removeFirst()
}
}
}
}
}```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, Element>: CacheProtocol {
private var cache: [Key: Element]
private var keys: [Key]
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
self.cache = [Key: Element]()
self.keys = [Key]()
}
subscript(key: Key) -> Element? {
get {
return cache[key]
}
set {
if let index = keys.firstIndex(of: key) {
keys.remove(at: index)
}
if let value = newValue {
cache[key] = value
keys.append(key)
}
if keys.count > capacity {
if let keyToRemove = keys.first {
cache.removeValue(forKey: keyToRemove)
keys.removeFirst()
}
}
}
}
}
```init(capacity: Int) { // initializer requirement 'init(capacity:)' can only be satisfied by a 'required' initializer in non-final class 'Cache<Key, Element>'protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
import Foundation
class Cache<Key: Hashable, Element>: CacheProtocol {
private var cache: [Key: Element]
private var keys: [Key]
init(capacity: Int) {
self.cache = [:]
self.keys = []
}
subscript(key: Key) -> Element? {
get {
return cache[key]
}
set {
if let index = keys.firstIndex(of: key) {
keys.remove(at: index)
}
keys.append(key)
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, Element>: CacheProtocol {
private var cache: [Key: Element]
private var keys: [Key]
init(capacity: Int) {
self.cache = [:]
self.keys = []
}
subscript(key: Key) -> Element? {
get {
return cache[key]
}
set {
if let index = keys.firstIndex(of: key) {
keys.remove(at: index)
}
keys.append(key)
cache[key] = newValue
}
}
}
// Usage
let cache = Cache<String, Int>(capacity: 5)
cache["key1"] = 1
cache["key2"] = 2
cache["key3"] = 3
cache["key4"] = 4
cache["key5"] = 5
print(cache["key1"]) // nil
print(cache["key2"]) // Optional(2)
print(cache["key3"]) // Optional(3)
print(cache["key4"]) // Optional(4)
print(cache["key5"]) // Optional(5)
```init(capacity: Int) { // initializer requirement 'init(capacity:)' can only be satisfied by a 'required' initializer in non-final class 'Cache<Key, Element>'protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
import Foundation
class Cache<Key: Hashable, Element>: CacheProtocol {
private var cache: [Key: Element] = [:]
private var keys: [Key] = []
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
}
subscript(key: Key) -> Element? {
get {
return cache[key]
}
set {
if let value = newValue {
if cache[key] == nil {
if cache.count == capacity {
removeLeastRecentlyUsed()
}
keys.append(key)
}
cache[key] = value
} else {
cache[key] = nil
keys.removeAll(where: { $0 == key })
}
}
}
private func removeLeastRecentlyUsed() {
guard let key = keys.first else { return }
cache[key] = nil
keys.removeFirst()
}
}```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, Element>: CacheProtocol {
private var cache: [Key: Element] = [:]
private var keys: [Key] = []
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
}
subscript(key: Key) -> Element? {
get {
return cache[key]
}
set {
if let value = newValue {
if cache[key] == nil {
if cache.count == capacity {
removeLeastRecentlyUsed()
}
keys.append(key)
}
cache[key] = value
} else {
cache[key] = nil
keys.removeAll(where: { $0 == key })
}
}
}
private func removeLeastRecentlyUsed() {
guard let key = keys.first else { return }
cache[key] = nil
keys.removeFirst()
}
}
// Example usage
let cache: Cache<String, Int> = Cache(capacity: 3)
cache["key1"] = 1
cache["key2"] = 2
cache["key3"] = 3
cache["key4"] = 4
print(cache["key1"]) // nil
print(cache["key2"]) // Optional(2)
print(cache["key3"]) // Optional(3)
print(cache["key4"]) // Optional(4)
cache["key1"] = 1
cache["key2"] = 2
cache["key3"] = 3
cache["key4"] = 4
print(cache["key1"]) // Optional(1)
print(cache["key2"]) // Optional(2)
print(cache["key3"]) // Optional(3)
print(cache["key4"]) // Optional(4)
cache["key1"] = nil
cache["key2"] = nil
cache["key3"] = nil
cache["key4"] = nil
print(cache["key1"]) // nil
print(cache["key2"]) // nil
print(cache["key3"]) // nil
print(cache["key4"]) // nil
```init(capacity: Int) { // initializer requirement 'init(capacity:)' can only be satisfied by a 'required' initializer in non-final class 'Cache<Key, Element>'protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
import Foundation
class Cache<Key: Hashable, Element>: CacheProtocol {
private var cache: [Key: Element]
private var keys: [Key]
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
self.cache = [Key: Element]()
self.keys = [Key]()
}
subscript(key: Key) -> Element? {
get {
if let index = keys.firstIndex(of: key) {
keys.remove(at: index)
keys.append(key)
}
return cache[key]
}
set {
if let index = keys.firstIndex(of: key) {
keys.remove(at: index)
}
if cache.count == capacity {
cache.removeValue(forKey: keys.removeFirst())
}
keys.append(key)
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, Element>: CacheProtocol {
private var cache: [Key: Element]
private var keys: [Key]
private let capacity: Int
init(capacity: Int) {
self.capacity = capacity
self.cache = [Key: Element]()
self.keys = [Key]()
}
subscript(key: Key) -> Element? {
get {
if let index = keys.firstIndex(of: key) {
keys.remove(at: index)
keys.append(key)
}
return cache[key]
}
set {
if let index = keys.firstIndex(of: key) {
keys.remove(at: index)
}
if cache.count == capacity {
cache.removeValue(forKey: keys.removeFirst())
}
keys.append(key)
cache[key] = newValue
}
}
}
// Test
let cache = Cache<String, Int>(capacity: 3)
cache["key1"] = 1
cache["key2"] = 2
cache["key3"] = 3
cache["key4"] = 4
print(cache["key1"]?? -1) // -1
print(cache["key2"]?? -1) // 2
print(cache["key3"]?? -1) // 3
print(cache["key4"]?? -1) // 4
```init(capacity: Int) { // initializer requirement 'init(capacity:)' can only be satisfied by a 'required' initializer in non-final class 'Cache<Key, Element>'protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
import Foundation
class Cache<Key: Hashable, Element>: CacheProtocol {
private var cache: [Key: Element]
private var keys: [Key]
private var capacity: Int
init(capacity: Int) {
self.capacity = capacity
self.cache = [Key: Element]()
self.keys = [Key]()
}
subscript(key: Key) -> Element? {
get {
if let element = cache[key] {
updateKeyOrder(key: key)
return element
}
return nil
}
set {
if let element = newValue {
if cache.count == capacity {
removeLeastRecentlyUsedKey()
}
cache[key] = element
keys.append(key)
} else {
cache.removeValue(forKey: key)
if let index = keys.firstIndex(of: key) {
keys.remove(at: index)
}
}
}
}
private func updateKeyOrder(key: Key) {
if let index = keys.firstIndex(of: key) {
keys.remove(at: index)
}
keys.append(key)
}
private func removeLeastRecentlyUsedKey() {
if let key = keys.first {
cache.removeValue(forKey: key)
keys.removeFirst()
}
}
}```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, Element>: CacheProtocol {
private var cache: [Key: Element]
private var keys: [Key]
private var capacity: Int
init(capacity: Int) {
self.capacity = capacity
self.cache = [Key: Element]()
self.keys = [Key]()
}
subscript(key: Key) -> Element? {
get {
if let element = cache[key] {
updateKeyOrder(key: key)
return element
}
return nil
}
set {
if let element = newValue {
if cache.count == capacity {
removeLeastRecentlyUsedKey()
}
cache[key] = element
keys.append(key)
} else {
cache.removeValue(forKey: key)
if let index = keys.firstIndex(of: key) {
keys.remove(at: index)
}
}
}
}
private func updateKeyOrder(key: Key) {
if let index = keys.firstIndex(of: key) {
keys.remove(at: index)
}
keys.append(key)
}
private func removeLeastRecentlyUsedKey() {
if let key = keys.first {
cache.removeValue(forKey: key)
keys.removeFirst()
}
}
}
// Example usage
let cache: Cache<String, Int> = Cache<String, Int>(capacity: 3)
cache["key1"] = 1
cache["key2"] = 2
cache["key3"] = 3
cache["key4"] = 4
print(cache["key1"]) // nil
print(cache["key2"]) // Optional(2)
print(cache["key3"]) // Optional(3)
print(cache["key4"]) // Optional(4)
```init(capacity: Int) { // initializer requirement 'init(capacity:)' can only be satisfied by a 'required' initializer in non-final class 'Cache<Key, Element>'protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
import Foundation
class Cache<Key: Hashable, Element>: CacheProtocol {
private var cache: [Key: Element]
private var keys: [Key]
private let capacity: Int
required init(capacity: Int) {
self.capacity = capacity
self.cache = [:]
self.keys = []
}
subscript(key: Key) -> Element? {
get {
return cache[key]
}
set {
if let value = newValue {
if cache[key] == nil {
if cache.count == capacity {
let keyToRemove = keys.removeFirst()
cache.removeValue(forKey: keyToRemove)
}
keys.append(key)
}
cache[key] = value
} else {
cache.removeValue(forKey: key)
if let index = keys.firstIndex(of: key) {
keys.remove(at: index)
}
}
}
}
}```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, Element>: CacheProtocol {
private var cache: [Key: Element]
private var keys: [Key]
private let capacity: Int
required init(capacity: Int) {
self.capacity = capacity
self.cache = [:]
self.keys = []
}
subscript(key: Key) -> Element? {
get {
return cache[key]
}
set {
if let value = newValue {
if cache[key] == nil {
if cache.count == capacity {
let keyToRemove = keys.removeFirst()
cache.removeValue(forKey: keyToRemove)
}
keys.append(key)
}
cache[key] = value
} else {
cache.removeValue(forKey: key)
if let index = keys.firstIndex(of: key) {
keys.remove(at: index)
}
}
}
}
}
// Example usage:
let cache: Cache<String, Int> = Cache(capacity: 3)
cache["key1"] = 1
cache["key2"] = 2
cache["key3"] = 3
cache["key4"] = 4
print(cache["key1"]) // nil
print(cache["key2"]) // Optional(2)
print(cache["key3"]) // Optional(3)
print(cache["key4"]) // Optional(4)
```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]
private var expirationDates: [Key: Date]
private var expirationTimer: Timer?
init() {
cache = [:]
expirationDates = [:]
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
put(value: newValue, key: key, expiration: 0)
}
}
func put(value: Value?, key: Key, expiration: TimeInterval) {
guard let value = value else {
cache.removeValue(forKey: key)
expirationDates.removeValue(forKey: key)
return
}
cache[key] = value
expirationDates[key] = Date(timeIntervalSinceNow: expiration)
if expirationTimer == nil {
expirationTimer = Timer.scheduledTimer(withTimeInterval: 1, repeats: true, block: { [weak self] _ in
self?.evictExpired()
})
}
}
func get(key: Key) -> Value? {
return cache[key]
}
private func evictExpired() {
let now = Date()
for (key, expirationDate) in expirationDates {
if now > expirationDate {
cache.removeValue(forKey: key)
expirationDates.removeValue(forKey: key)
}
}
}
}```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]
private var expirationDates: [Key: Date]
private var expirationTimer: Timer?
init() {
cache = [:]
expirationDates = [:]
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
put(value: newValue, key: key, expiration: 0)
}
}
func put(value: Value?, key: Key, expiration: TimeInterval) {
guard let value = value else {
cache.removeValue(forKey: key)
expirationDates.removeValue(forKey: key)
return
}
cache[key] = value
expirationDates[key] = Date(timeIntervalSinceNow: expiration)
if expirationTimer == nil {
expirationTimer = Timer.scheduledTimer(withTimeInterval: 1, repeats: true, block: { [weak self] _ in
self?.evictExpired()
})
}
}
func get(key: Key) -> Value? {
return cache[key]
}
private func evictExpired() {
let now = Date()
for (key, expirationDate) in expirationDates {
if now > expirationDate {
cache.removeValue(forKey: key)
expirationDates.removeValue(forKey: key)
}
}
}
}
// Example usage
let cache = ExpirableCache<String, Int>()
cache.put(value: 1, key: "key1", expiration: 10)
cache.put(value: 2, key: "key2", expiration: 10)
cache.put(value: 3, key: "key3", expiration: 10)
cache["key1"] = 4
print(cache.get(key: "key1"))
print(cache.get(key: "key2"))
print(cache.get(key: "key3"))
// Wait for 10 seconds
sleep(10)
print(cache.get(key: "key1"))
print(cache.get(key: "key2"))
print(cache.get(key: "key3"))
```class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol { // type 'ExpirableCache<Key, Value>' does not conform to protocol 'ExpirableCacheProtocol'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]
private var expiration: [Key: Date]
init() {
cache = [:]
expiration = [:]
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
put(value: newValue, key: key, expiration: 0)
}
}
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = value
if expiration > 0 {
self.expiration[key] = Date(timeIntervalSinceNow: expiration)
}
}
func get(key: Key) -> Value? {
guard let value = cache[key] else {
return nil
}
if let expirationDate = expiration[key], expirationDate < Date() {
cache[key] = nil
expiration[key] = nil
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]
private var expiration: [Key: Date]
init() {
cache = [:]
expiration = [:]
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
put(value: newValue, key: key, expiration: 0)
}
}
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = value
if expiration > 0 {
self.expiration[key] = Date(timeIntervalSinceNow: expiration)
}
}
func get(key: Key) -> Value? {
guard let value = cache[key] else {
return nil
}
if let expirationDate = expiration[key], expirationDate < Date() {
cache[key] = nil
expiration[key] = nil
return nil
}
return value
}
}
// Test
let cache = ExpirableCache<String, Int>()
cache["1"] = 1
cache["2"] = 2
cache["3"] = 3
print(cache["1"]?? "nil")
print(cache["2"]?? "nil")
print(cache["3"]?? "nil")
cache.put(value: 4, key: "4", expiration: 1)
print(cache["4"]?? "nil")
sleep(1)
print(cache["4"]?? "nil")
```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]()
private var expirationDates = [Key: Date]()
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
put(value: newValue, key: key, expiration: 0)
}
}
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = value
expirationDates[key] = Date(timeIntervalSinceNow: expiration)
}
func get(key: Key) -> Value? {
guard let expirationDate = expirationDates[key], expirationDate > Date() else {
return nil
}
return cache[key]
}
}```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]()
private var expirationDates = [Key: Date]()
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
put(value: newValue, key: key, expiration: 0)
}
}
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = value
expirationDates[key] = Date(timeIntervalSinceNow: expiration)
}
func get(key: Key) -> Value? {
guard let expirationDate = expirationDates[key], expirationDate > Date() else {
return nil
}
return cache[key]
}
}
```put(value: newValue, key: key, expiration: 0) // value of optional type 'Value?' must be unwrapped to a value of type 'Value'Thread.sleep(forTimeInterval: 1.1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6Thread.sleep(forTimeInterval: 0.9) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
import Foundation
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache: [Key: Value]
private var expirationDates: [Key: Date]
private var expirationTimer: Timer?
init() {
cache = [:]
expirationDates = [:]
}
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = value
expirationDates[key] = Date(timeIntervalSinceNow: expiration)
startExpirationTimer()
}
func get(key: Key) -> Value? {
return cache[key]
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
put(value: newValue!, key: key, expiration: 10)
}
}
private func startExpirationTimer() {
if expirationTimer == nil {
expirationTimer = Timer.scheduledTimer(withTimeInterval: 1, repeats: true, block: { [weak self] _ in
self?.checkExpiration()
})
}
}
private func checkExpiration() {
let now = Date()
for (key, expirationDate) in expirationDates {
if now > expirationDate {
cache[key] = nil
expirationDates[key] = nil
}
}
}
}```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]
private var expirationDates: [Key: Date]
private var expirationTimer: Timer?
init() {
cache = [:]
expirationDates = [:]
}
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = value
expirationDates[key] = Date(timeIntervalSinceNow: expiration)
startExpirationTimer()
}
func get(key: Key) -> Value? {
return cache[key]
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
put(value: newValue!, key: key, expiration: 10)
}
}
private func startExpirationTimer() {
if expirationTimer == nil {
expirationTimer = Timer.scheduledTimer(withTimeInterval: 1, repeats: true, block: { [weak self] _ in
self?.checkExpiration()
})
}
}
private func checkExpiration() {
let now = Date()
for (key, expirationDate) in expirationDates {
if now > expirationDate {
cache[key] = nil
expirationDates[key] = nil
}
}
}
}
// Usage example
let cache = ExpirableCache<String, String>()
cache["key"] = "value"
cache["key"] // "value"
// Expiration
Thread.sleep(forTimeInterval: 11)
cache["key"] // nil
```Thread.sleep(forTimeInterval: 1.1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6Thread.sleep(forTimeInterval: 0.9) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6 // XCTAssertNil failed: expression is not nilprotocol 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]
private var expirationDates: [Key: Date]
init() {
cache = [:]
expirationDates = [:]
}
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = value
expirationDates[key] = Date(timeIntervalSinceNow: expiration)
}
func get(key: Key) -> Value? {
guard let expirationDate = expirationDates[key], expirationDate > Date() else {
return nil
}
return cache[key]
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
guard let value = newValue else {
cache[key] = nil
expirationDates[key] = nil
return
}
put(value: value, key: key, expiration: 10)
}
}
}```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]
private var expirationDates: [Key: Date]
init() {
cache = [:]
expirationDates = [:]
}
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = value
expirationDates[key] = Date(timeIntervalSinceNow: expiration)
}
func get(key: Key) -> Value? {
guard let expirationDate = expirationDates[key], expirationDate > Date() else {
return nil
}
return cache[key]
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
guard let value = newValue else {
cache[key] = nil
expirationDates[key] = nil
return
}
put(value: value, key: key, expiration: 10)
}
}
}
// Test
let cache = ExpirableCache<String, Int>()
cache["1"] = 1
cache["2"] = 2
cache["3"] = 3
cache["4"] = 4
cache["5"] = 5
print(cache["1"]) // Optional(1)
print(cache["2"]) // Optional(2)
print(cache["3"]) // Optional(3)
print(cache["4"]) // Optional(4)
print(cache["5"]) // Optional(5)
// Wait for expiration
sleep(11)
print(cache["1"]) // nil
print(cache["2"]) // nil
print(cache["3"]) // nil
print(cache["4"]) // nil
print(cache["5"]) // nil
```Thread.sleep(forTimeInterval: 1.1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6Thread.sleep(forTimeInterval: 0.9) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
import Foundation
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache: [Key: Value]
private var expiration: [Key: Date]
init() {
cache = [:]
expiration = [:]
}
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = value
self.expiration[key] = Date(timeIntervalSinceNow: expiration)
}
func get(key: Key) -> Value? {
guard let expirationDate = expiration[key], expirationDate > Date() else {
return nil
}
return cache[key]
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
guard let value = newValue else {
return
}
put(value: value, key: key, expiration: 10)
}
}
}```swift
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]
private var expiration: [Key: Date]
init() {
cache = [:]
expiration = [:]
}
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = value
self.expiration[key] = Date(timeIntervalSinceNow: expiration)
}
func get(key: Key) -> Value? {
guard let expirationDate = expiration[key], expirationDate > Date() else {
return nil
}
return cache[key]
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
guard let value = newValue else {
return
}
put(value: value, key: key, expiration: 10)
}
}
}
// Usage
let cache = ExpirableCache<String, String>()
cache["key"] = "value"
cache["key"] // "value"
// Expired value
cache["key"] = "value"
sleep(11)
cache["key"] // nil
```Thread.sleep(forTimeInterval: 1.1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6Thread.sleep(forTimeInterval: 0.9) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
import Foundation
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache: [Key: Value]
private var expiration: [Key: Date]
init() {
self.cache = [:]
self.expiration = [:]
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
if let value = newValue {
put(value: value, key: key, expiration: 10)
}
}
}
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = value
self.expiration[key] = Date(timeIntervalSinceNow: expiration)
}
func get(key: Key) -> Value? {
guard let expirationDate = expiration[key], expirationDate > Date() else {
return nil
}
return cache[key]
}
}```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]
private var expiration: [Key: Date]
init() {
self.cache = [:]
self.expiration = [:]
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
if let value = newValue {
put(value: value, key: key, expiration: 10)
}
}
}
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = value
self.expiration[key] = Date(timeIntervalSinceNow: expiration)
}
func get(key: Key) -> Value? {
guard let expirationDate = expiration[key], expirationDate > Date() else {
return nil
}
return cache[key]
}
}
// Usage
let cache = ExpirableCache<String, Int>()
cache["key"] = 1
print(cache["key"])
```Thread.sleep(forTimeInterval: 1.1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6Thread.sleep(forTimeInterval: 0.9) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 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]
private var expirationDates: [Key: Date]
init() {
cache = [:]
expirationDates = [:]
}
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = value
expirationDates[key] = Date().addingTimeInterval(expiration)
}
func get(key: Key) -> Value? {
guard let expirationDate = expirationDates[key], expirationDate > Date() else {
return nil
}
return cache[key]
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
put(value: newValue!, key: key, expiration: 10)
}
}
}```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]
private var expirationDates: [Key: Date]
init() {
cache = [:]
expirationDates = [:]
}
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = value
expirationDates[key] = Date().addingTimeInterval(expiration)
}
func get(key: Key) -> Value? {
guard let expirationDate = expirationDates[key], expirationDate > Date() else {
return nil
}
return cache[key]
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
put(value: newValue!, key: key, expiration: 10)
}
}
}
```Thread.sleep(forTimeInterval: 1.1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6Thread.sleep(forTimeInterval: 0.9) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
import Foundation
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache: [Key: Value]
private var expiration: [Key: Date]
init() {
cache = [:]
expiration = [:]
}
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = value
self.expiration[key] = Date().addingTimeInterval(expiration)
}
func get(key: Key) -> Value? {
guard let expirationDate = expiration[key], expirationDate > Date() else {
return nil
}
return cache[key]
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
put(value: newValue!, key: key, expiration: 10)
}
}
}```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]
private var expiration: [Key: Date]
init() {
cache = [:]
expiration = [:]
}
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = value
self.expiration[key] = Date().addingTimeInterval(expiration)
}
func get(key: Key) -> Value? {
guard let expirationDate = expiration[key], expirationDate > Date() else {
return nil
}
return cache[key]
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
put(value: newValue!, key: key, expiration: 10)
}
}
}
// Usage
let cache = ExpirableCache<String, String>()
cache["key"] = "value"
cache["key"] // "value"
// Expiration
Thread.sleep(forTimeInterval: 11)
cache["key"] // nil
```Thread.sleep(forTimeInterval: 1.1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6Thread.sleep(forTimeInterval: 0.9) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
import Foundation
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache: [Key: Value] = [:]
private var expirationDates: [Key: Date] = [:]
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = value
expirationDates[key] = Date(timeIntervalSinceNow: expiration)
}
func get(key: Key) -> Value? {
guard let expirationDate = expirationDates[key], expirationDate > Date() else {
return nil
}
return cache[key]
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
guard let value = newValue else {
cache[key] = nil
expirationDates[key] = nil
return
}
put(value: value, key: key, expiration: 10)
}
}
}```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] = [:]
private var expirationDates: [Key: Date] = [:]
func put(value: Value, key: Key, expiration: TimeInterval) {
cache[key] = value
expirationDates[key] = Date(timeIntervalSinceNow: expiration)
}
func get(key: Key) -> Value? {
guard let expirationDate = expirationDates[key], expirationDate > Date() else {
return nil
}
return cache[key]
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
guard let value = newValue else {
cache[key] = nil
expirationDates[key] = nil
return
}
put(value: value, key: key, expiration: 10)
}
}
}
// Usage
let cache = ExpirableCache<String, Int>()
cache["key"] = 1
cache["key"] // 1
// Expiration
Thread.sleep(forTimeInterval: 10)
cache["key"] // nil
```Thread.sleep(forTimeInterval: 1.1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6Thread.sleep(forTimeInterval: 0.9) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let keyData = key.data(using:.utf8)!
let stringData = string.data(using:.utf8)!
let encryptedData = stringData.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return Data(encryptedData)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using:.utf8)!
let decryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return String(data: Data(decryptedData), encoding:.utf8)!
}
}```swift
protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
// Simple XOR encryptor and decryptor that converts plain text into encrypted text by applying the binary 'Exclusive OR' operator implemented according to the protocol.
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let keyData = key.data(using:.utf8)!
let stringData = string.data(using:.utf8)!
let encryptedData = stringData.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return Data(encryptedData)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using:.utf8)!
let decryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return String(data: Data(decryptedData), encoding:.utf8)!
}
}
```protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let keyData = key.data(using:.utf8)!
let stringData = string.data(using:.utf8)!
let encryptedData = stringData.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return Data(encryptedData)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using:.utf8)!
let decryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return String(data: Data(decryptedData), encoding:.utf8)!
}
}```swift
protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
// Simple XOR encryptor and decryptor that converts plain text into encrypted text by applying the binary 'Exclusive OR' operator implemented according to the protocol.
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let keyData = key.data(using:.utf8)!
let stringData = string.data(using:.utf8)!
let encryptedData = stringData.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return Data(encryptedData)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using:.utf8)!
let decryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return String(data: Data(decryptedData), encoding:.utf8)!
}
}
```protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let keyData = key.data(using:.utf8)!
let stringData = string.data(using:.utf8)!
let encryptedData = stringData.enumerated().map {
$0.element ^ keyData[$0.offset % keyData.count]
}
return Data(encryptedData)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using:.utf8)!
let decryptedData = data.enumerated().map {
$0.element ^ keyData[$0.offset % keyData.count]
}
return String(data: Data(decryptedData), encoding:.utf8)!
}
}```swift
protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
// Simple XOR encryptor and decryptor that converts plain text into encrypted text by applying the binary 'Exclusive OR' operator implemented according to the protocol.
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let keyData = key.data(using:.utf8)!
let stringData = string.data(using:.utf8)!
let encryptedData = stringData.enumerated().map {
$0.element ^ keyData[$0.offset % keyData.count]
}
return Data(encryptedData)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using:.utf8)!
let decryptedData = data.enumerated().map {
$0.element ^ keyData[$0.offset % keyData.count]
}
return String(data: Data(decryptedData), encoding:.utf8)!
}
}
```protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let data = string.data(using:.utf8)!
let keyData = key.data(using:.utf8)!
let encryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return Data(encryptedData)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using:.utf8)!
let decryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return String(data: Data(decryptedData), encoding:.utf8)!
}
}```swift
protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
// Simple XOR encryptor and decryptor that converts plain text into encrypted text by applying the binary 'Exclusive OR' operator implemented according to the protocol.
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let data = string.data(using:.utf8)!
let keyData = key.data(using:.utf8)!
let encryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return Data(encryptedData)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using:.utf8)!
let decryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return String(data: Data(decryptedData), encoding:.utf8)!
}
}
```protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let data = string.data(using:.utf8)!
let keyData = key.data(using:.utf8)!
let encryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return Data(encryptedData)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using:.utf8)!
let decryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return String(data: Data(decryptedData), encoding:.utf8)!
}
}```swift
protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
// Simple XOR encryptor and decryptor that converts plain text into encrypted text by applying the binary 'Exclusive OR' operator implemented according to the protocol.
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let data = string.data(using:.utf8)!
let keyData = key.data(using:.utf8)!
let encryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return Data(encryptedData)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using:.utf8)!
let decryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return String(data: Data(decryptedData), encoding:.utf8)!
}
}
// Simple XOR encryptor and decryptor that converts plain text into encrypted text by applying the binary 'Exclusive OR' operator implemented according to the protocol.
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let data = string.data(using:.utf8)!
let keyData = key.data(using:.utf8)!
let encryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return Data(encryptedData)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using:.utf8)!
let decryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return String(data: Data(decryptedData), encoding:.utf8)!
}
}
// Simple XOR encryptor and decryptor that converts plain text into encrypted text by applying the binary 'Exclusive OR' operator implemented according to the protocol.
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let data = string.data(using:.utf8)!
let keyData = key.data(using:.utf8)!
let encryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return Data(encryptedData)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using:.utf8)!
let decryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return String(data: Data(decryptedData), encoding:.utf8)!
}
}
// Simple XOR encryptor and decryptor that converts plain text into encrypted text by applying the binary 'Exclusive OR' operator implemented according to the protocol.
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let data = string.data(using:.utf8)!
let keyData = key.data(using:.utf8)!
let encryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return Data(encryptedData)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using:.utf8)!
let decryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return String(data: Data(decryptedData), encoding:.utf8)!
}
}
// Simple XOR encryptor and decryptor that converts plain text into encrypted text by applying the binary 'Exclusive OR' operator implemented according to the protocol.
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let data = string.data(using:.utf8)!
let keyData = key.data(using:.utf8)!
let encryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return Data(encryptedData)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using:.utf8)!
let decryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return String(data: Data(decryptedData), encoding:.utf8protocol 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 = Data(key.utf8)
let stringData = Data(string.utf8)
let encryptedData = stringData.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return Data(encryptedData)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = Data(key.utf8)
let decryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return String(data: Data(decryptedData), encoding:.utf8)!
}
}```swift
protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
// Simple XOR encryptor and decryptor that converts plain text into encrypted text by applying the binary 'Exclusive OR' operator implemented according to the protocol.
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let keyData = Data(key.utf8)
let stringData = Data(string.utf8)
let encryptedData = stringData.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return Data(encryptedData)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = Data(key.utf8)
let decryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return String(data: Data(decryptedData), encoding:.utf8)!
}
}
```protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let keyData = key.data(using:.utf8)!
let stringData = string.data(using:.utf8)!
let encryptedData = stringData.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return Data(encryptedData)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using:.utf8)!
let decryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return String(data: Data(decryptedData), encoding:.utf8)!
}
}```swift
protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
// Simple XOR encryptor and decryptor that converts plain text into encrypted text by applying the binary 'Exclusive OR' operator implemented according to the protocol.
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let keyData = key.data(using:.utf8)!
let stringData = string.data(using:.utf8)!
let encryptedData = stringData.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return Data(encryptedData)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using:.utf8)!
let decryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return String(data: Data(decryptedData), encoding:.utf8)!
}
}
```protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let data = string.data(using:.utf8)!
let keyData = key.data(using:.utf8)!
let encryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return Data(encryptedData)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using:.utf8)!
let decryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return String(data: Data(decryptedData), encoding:.utf8)!
}
}```swift
protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
// Simple XOR encryptor and decryptor that converts plain text into encrypted text by applying the binary 'Exclusive OR' operator implemented according to the protocol.
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let data = string.data(using:.utf8)!
let keyData = key.data(using:.utf8)!
let encryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return Data(encryptedData)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using:.utf8)!
let decryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return String(data: Data(decryptedData), encoding:.utf8)!
}
}
```protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let keyData = key.data(using:.utf8)!
let stringData = string.data(using:.utf8)!
let encryptedData = stringData.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return Data(encryptedData)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using:.utf8)!
let decryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return String(data: Data(decryptedData), encoding:.utf8)!
}
}```swift
protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
// Simple XOR encryptor and decryptor that converts plain text into encrypted text by applying the binary 'Exclusive OR' operator implemented according to the protocol.
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let keyData = key.data(using:.utf8)!
let stringData = string.data(using:.utf8)!
let encryptedData = stringData.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return Data(encryptedData)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using:.utf8)!
let decryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return String(data: Data(decryptedData), encoding:.utf8)!
}
}
```protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let data = string.data(using:.utf8)!
let keyData = key.data(using:.utf8)!
let encryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return Data(encryptedData)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using:.utf8)!
let decryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return String(data: Data(decryptedData), encoding:.utf8)!
}
}```swift
protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
// Simple XOR encryptor and decryptor that converts plain text into encrypted text by applying the binary 'Exclusive OR' operator implemented according to the protocol.
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let data = string.data(using:.utf8)!
let keyData = key.data(using:.utf8)!
let encryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return Data(encryptedData)
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using:.utf8)!
let decryptedData = data.enumerated().map { (index, element) in
element ^ keyData[index % keyData.count]
}
return String(data: Data(decryptedData), encoding:.utf8)!
}
}
```protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
class RateLimiter: RateLimiterProtocol {
private let maxRequests: Int
private let timeInterval: TimeInterval
private var requestCount = 0
private var lastRequestTime: Date?
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
guard let lastRequestTime = lastRequestTime else {
self.lastRequestTime = Date()
requestCount += 1
return true
}
let elapsedTime = Date().timeIntervalSince(lastRequestTime)
if elapsedTime > timeInterval {
self.lastRequestTime = Date()
requestCount = 1
return true
}
if requestCount < maxRequests {
requestCount += 1
return true
}
return false
}
}```swift
protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter: RateLimiterProtocol {
private let maxRequests: Int
private let timeInterval: TimeInterval
private var requestCount = 0
private var lastRequestTime: Date?
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
guard let lastRequestTime = lastRequestTime else {
self.lastRequestTime = Date()
requestCount += 1
return true
}
let elapsedTime = Date().timeIntervalSince(lastRequestTime)
if elapsedTime > timeInterval {
self.lastRequestTime = Date()
requestCount = 1
return true
}
if requestCount < maxRequests {
requestCount += 1
return true
}
return false
}
}
// Usage
let rateLimiter = RateLimiter(maxRequests: 10, timeInterval: 60)
for _ in 1...15 {
if rateLimiter.allowRequest() {
print("Request allowed")
} else {
print("Request denied")
}
}
```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 requestCount = 0
private var lastRequestTime: Date?
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
guard let lastRequestTime = lastRequestTime else {
self.lastRequestTime = Date()
requestCount += 1
return true
}
let elapsedTime = Date().timeIntervalSince(lastRequestTime)
if elapsedTime > timeInterval {
self.lastRequestTime = Date()
requestCount = 1
return true
}
if requestCount < maxRequests {
requestCount += 1
return true
}
return false
}
}```swift
protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter: RateLimiterProtocol {
private let maxRequests: Int
private let timeInterval: TimeInterval
private var requestCount = 0
private var lastRequestTime: Date?
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
guard let lastRequestTime = lastRequestTime else {
self.lastRequestTime = Date()
requestCount += 1
return true
}
let elapsedTime = Date().timeIntervalSince(lastRequestTime)
if elapsedTime > timeInterval {
self.lastRequestTime = Date()
requestCount = 1
return true
}
if requestCount < maxRequests {
requestCount += 1
return true
}
return false
}
}
```Thread.sleep(forTimeInterval: 1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
class RateLimiter: RateLimiterProtocol {
private let maxRequests: Int
private let timeInterval: TimeInterval
private var requestCount = 0
private var lastRequestTime: Date?
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
guard let lastRequestTime = lastRequestTime else {
self.lastRequestTime = Date()
requestCount += 1
return true
}
let elapsedTime = Date().timeIntervalSince(lastRequestTime)
if elapsedTime > timeInterval {
self.lastRequestTime = Date()
requestCount = 1
return true
}
if requestCount < maxRequests {
requestCount += 1
return true
}
return false
}
}```swift
protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter: RateLimiterProtocol {
private let maxRequests: Int
private let timeInterval: TimeInterval
private var requestCount = 0
private var lastRequestTime: Date?
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
guard let lastRequestTime = lastRequestTime else {
self.lastRequestTime = Date()
requestCount += 1
return true
}
let elapsedTime = Date().timeIntervalSince(lastRequestTime)
if elapsedTime > timeInterval {
self.lastRequestTime = Date()
requestCount = 1
return true
}
if requestCount < maxRequests {
requestCount += 1
return true
}
return false
}
}
```Thread.sleep(forTimeInterval: 1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
class RateLimiter: RateLimiterProtocol {
private let maxRequests: Int
private let timeInterval: TimeInterval
private var requestCount: Int = 0
private var lastRequestTime: Date?
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
guard let lastRequestTime = lastRequestTime else {
self.lastRequestTime = Date()
return true
}
let elapsedTime = Date().timeIntervalSince(lastRequestTime)
if elapsedTime > timeInterval {
self.lastRequestTime = Date()
requestCount = 1
return true
}
if requestCount < maxRequests {
requestCount += 1
return true
}
return false
}
}```swift
protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter: RateLimiterProtocol {
private let maxRequests: Int
private let timeInterval: TimeInterval
private var requestCount: Int = 0
private var lastRequestTime: Date?
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
guard let lastRequestTime = lastRequestTime else {
self.lastRequestTime = Date()
return true
}
let elapsedTime = Date().timeIntervalSince(lastRequestTime)
if elapsedTime > timeInterval {
self.lastRequestTime = Date()
requestCount = 1
return true
}
if requestCount < maxRequests {
requestCount += 1
return true
}
return false
}
}
```Thread.sleep(forTimeInterval: 1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6 // XCTAssertFalse failedprotocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
class RateLimiter: RateLimiterProtocol {
private let maxRequests: Int
private let timeInterval: TimeInterval
private var lastRequestTime: Date?
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
guard let lastRequestTime = lastRequestTime else {
self.lastRequestTime = Date()
return true
}
let elapsedTime = Date().timeIntervalSince(lastRequestTime)
if elapsedTime > timeInterval {
self.lastRequestTime = Date()
return true
}
return false
}
}```swift
protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter: RateLimiterProtocol {
private let maxRequests: Int
private let timeInterval: TimeInterval
private var lastRequestTime: Date?
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
guard let lastRequestTime = lastRequestTime else {
self.lastRequestTime = Date()
return true
}
let elapsedTime = Date().timeIntervalSince(lastRequestTime)
if elapsedTime > timeInterval {
self.lastRequestTime = Date()
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: Date?
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
guard let lastRequestTime = lastRequestTime else {
self.lastRequestTime = Date()
return true
}
let elapsedTime = Date().timeIntervalSince(lastRequestTime)
if elapsedTime > timeInterval {
self.lastRequestTime = Date()
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: Date?
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
guard let lastRequestTime = lastRequestTime else {
self.lastRequestTime = Date()
return true
}
let elapsedTime = Date().timeIntervalSince(lastRequestTime)
if elapsedTime > timeInterval {
self.lastRequestTime = Date()
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: Date?
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
guard let lastRequestTime = lastRequestTime else {
self.lastRequestTime = Date()
return true
}
let elapsedTime = Date().timeIntervalSince(lastRequestTime)
if elapsedTime > timeInterval {
self.lastRequestTime = Date()
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: Date?
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
guard let lastRequestTime = lastRequestTime else {
self.lastRequestTime = Date()
return true
}
let elapsedTime = Date().timeIntervalSince(lastRequestTime)
if elapsedTime > timeInterval {
self.lastRequestTime = Date()
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: Date?
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> BoolThread.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 requestCount = 0
private var lastRequestTime: Date?
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
guard let lastRequestTime = lastRequestTime else {
self.lastRequestTime = Date()
return true
}
let elapsedTime = Date().timeIntervalSince(lastRequestTime)
if elapsedTime > timeInterval {
self.lastRequestTime = Date()
requestCount = 1
return true
}
if requestCount < maxRequests {
requestCount += 1
return true
}
return false
}
}```swift
protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter: RateLimiterProtocol {
private let maxRequests: Int
private let timeInterval: TimeInterval
private var requestCount = 0
private var lastRequestTime: Date?
init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
guard let lastRequestTime = lastRequestTime else {
self.lastRequestTime = Date()
return true
}
let elapsedTime = Date().timeIntervalSince(lastRequestTime)
if elapsedTime > timeInterval {
self.lastRequestTime = Date()
requestCount = 1
return true
}
if requestCount < maxRequests {
requestCount += 1
return true
}
return false
}
}
```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 requestCount = 0
private var lastRequestTime: Date?
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
guard let lastRequestTime = lastRequestTime else {
self.lastRequestTime = Date()
requestCount += 1
return true
}
let elapsedTime = Date().timeIntervalSince(lastRequestTime)
if elapsedTime > timeInterval {
self.lastRequestTime = Date()
requestCount = 1
return true
}
if requestCount < maxRequests {
requestCount += 1
return true
}
return false
}
}```swift
protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter: RateLimiterProtocol {
private let maxRequests: Int
private let timeInterval: TimeInterval
private var requestCount = 0
private var lastRequestTime: Date?
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
guard let lastRequestTime = lastRequestTime else {
self.lastRequestTime = Date()
requestCount += 1
return true
}
let elapsedTime = Date().timeIntervalSince(lastRequestTime)
if elapsedTime > timeInterval {
self.lastRequestTime = Date()
requestCount = 1
return true
}
if requestCount < maxRequests {
requestCount += 1
return true
}
return false
}
}
```Thread.sleep(forTimeInterval: 1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
class RateLimiter: RateLimiterProtocol {
private let maxRequests: Int
private let timeInterval: TimeInterval
private var requestCount: Int = 0
private var lastRequestTime: Date = Date()
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let now = Date()
let timeSinceLastRequest = now.timeIntervalSince(lastRequestTime)
// Check if the time since the last request is within the time interval
if timeSinceLastRequest < timeInterval {
// Check if the request count has reached the maximum
if requestCount >= maxRequests {
return false
} else {
// Increment the request count and return true
requestCount += 1
return true
}
} else {
// Reset the request count and last request time
requestCount = 1
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 let maxRequests: Int
private let timeInterval: TimeInterval
private var requestCount: Int = 0
private var lastRequestTime: Date = Date()
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let now = Date()
let timeSinceLastRequest = now.timeIntervalSince(lastRequestTime)
// Check if the time since the last request is within the time interval
if timeSinceLastRequest < timeInterval {
// Check if the request count has reached the maximum
if requestCount >= maxRequests {
return false
} else {
// Increment the request count and return true
requestCount += 1
return true
}
} else {
// Reset the request count and last request time
requestCount = 1
lastRequestTime = now
return true
}
}
}
// Usage
let rateLimiter = RateLimiter(maxRequests: 10, timeInterval: 60)
// Make requests
let canMakeRequest = rateLimiter.allowRequest()
```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 requestCount = 0
private var lastRequestTime: Date?
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
guard let lastRequestTime = lastRequestTime else {
self.lastRequestTime = Date()
requestCount += 1
return true
}
let elapsedTime = Date().timeIntervalSince(lastRequestTime)
if elapsedTime > timeInterval {
self.lastRequestTime = Date()
requestCount = 1
return true
}
if requestCount < maxRequests {
requestCount += 1
return true
}
return false
}
}```swift
protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter: RateLimiterProtocol {
private let maxRequests: Int
private let timeInterval: TimeInterval
private var requestCount = 0
private var lastRequestTime: Date?
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
guard let lastRequestTime = lastRequestTime else {
self.lastRequestTime = Date()
requestCount += 1
return true
}
let elapsedTime = Date().timeIntervalSince(lastRequestTime)
if elapsedTime > timeInterval {
self.lastRequestTime = Date()
requestCount = 1
return true
}
if requestCount < maxRequests {
requestCount += 1
return true
}
return false
}
}
```Thread.sleep(forTimeInterval: 1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
class RateLimiter: RateLimiterProtocol {
private let maxRequests: Int
private let timeInterval: TimeInterval
private var requestCount = 0
private var lastRequestTime: Date?
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
guard let lastRequestTime = lastRequestTime else {
self.lastRequestTime = Date()
requestCount += 1
return true
}
let elapsedTime = Date().timeIntervalSince(lastRequestTime)
if elapsedTime > timeInterval {
self.lastRequestTime = Date()
requestCount = 1
return true
}
if requestCount < maxRequests {
requestCount += 1
return true
}
return false
}
}```swift
protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter: RateLimiterProtocol {
private let maxRequests: Int
private let timeInterval: TimeInterval
private var requestCount = 0
private var lastRequestTime: Date?
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
guard let lastRequestTime = lastRequestTime else {
self.lastRequestTime = Date()
requestCount += 1
return true
}
let elapsedTime = Date().timeIntervalSince(lastRequestTime)
if elapsedTime > timeInterval {
self.lastRequestTime = Date()
requestCount = 1
return true
}
if requestCount < maxRequests {
requestCount += 1
return true
}
return false
}
}
```Thread.sleep(forTimeInterval: 1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let lock = NSLock()
required init(value: Int) {
self.value = value
}
func increment() {
lock.lock()
defer { lock.unlock() }
value += 1
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return value
}
}```swift
protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let lock = NSLock()
required init(value: Int) {
self.value = value
}
func increment() {
lock.lock()
defer { lock.unlock() }
value += 1
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return value
}
}
```protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let lock = NSLock()
required init(value: Int) {
self.value = value
}
func increment() {
lock.lock()
defer { lock.unlock() }
value += 1
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return value
}
}```swift
protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let lock = NSLock()
required init(value: Int) {
self.value = value
}
func increment() {
lock.lock()
defer { lock.unlock() }
value += 1
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return value
}
}
```protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var counter: Int
private let lock = NSLock()
required init(value: Int) {
self.counter = value
}
func increment() {
lock.lock()
counter += 1
lock.unlock()
}
func currentValue() -> Int {
lock.lock()
let value = counter
lock.unlock()
return value
}
}```swift
protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var counter: Int
private let lock = NSLock()
required init(value: Int) {
self.counter = value
}
func increment() {
lock.lock()
counter += 1
lock.unlock()
}
func currentValue() -> Int {
lock.lock()
let value = counter
lock.unlock()
return value
}
}
```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() {
self.lock.lock()
self.counter += 1
self.lock.unlock()
}
func currentValue() -> Int {
self.lock.lock()
let currentValue = self.counter
self.lock.unlock()
return currentValue
}
}```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() {
self.lock.lock()
self.counter += 1
self.lock.unlock()
}
func currentValue() -> Int {
self.lock.lock()
let currentValue = self.counter
self.lock.unlock()
return currentValue
}
}
```protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let lock = NSLock()
required init(value: Int) {
self.value = value
}
func increment() {
lock.lock()
defer { lock.unlock() }
value += 1
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return value
}
}```swift
protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let lock = NSLock()
required init(value: Int) {
self.value = value
}
func increment() {
lock.lock()
defer { lock.unlock() }
value += 1
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return value
}
}
```protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let lock = NSLock()
required init(value: Int) {
self.value = value
}
func increment() {
lock.lock()
defer { lock.unlock() }
value += 1
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return value
}
}```swift
protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let lock = NSLock()
required init(value: Int) {
self.value = value
}
func increment() {
lock.lock()
defer { lock.unlock() }
value += 1
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return value
}
}
```protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let lock = NSLock()
required init(value: Int) {
self.value = value
}
func increment() {
lock.lock()
defer { lock.unlock() }
value += 1
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return value
}
}```swift
protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let lock = NSLock()
required init(value: Int) {
self.value = value
}
func increment() {
lock.lock()
defer { lock.unlock() }
value += 1
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return value
}
}
```protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let lock = NSLock()
required init(value: Int) {
self.value = value
}
func increment() {
lock.lock()
value += 1
lock.unlock()
}
func currentValue() -> Int {
lock.lock()
let currentValue = value
lock.unlock()
return currentValue
}
}```swift
protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let lock = NSLock()
required init(value: Int) {
self.value = value
}
func increment() {
lock.lock()
value += 1
lock.unlock()
}
func currentValue() -> Int {
lock.lock()
let currentValue = value
lock.unlock()
return currentValue
}
}
```protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let lock = NSLock()
required init(value: Int) {
self.value = value
}
func increment() {
lock.lock()
defer { lock.unlock() }
value += 1
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return value
}
}```swift
protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let lock = NSLock()
required init(value: Int) {
self.value = value
}
func increment() {
lock.lock()
defer { lock.unlock() }
value += 1
}
func currentValue() -> Int {
lock.lock()
defer { lock.unlock() }
return value
}
}
```protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var counter: Int
private let lock = NSLock()
required init(value: Int) {
self.counter = value
}
func increment() {
self.lock.lock()
self.counter += 1
self.lock.unlock()
}
func currentValue() -> Int {
self.lock.lock()
let currentValue = self.counter
self.lock.unlock()
return currentValue
}
}```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() {
self.lock.lock()
self.counter += 1
self.lock.unlock()
}
func currentValue() -> Int {
self.lock.lock()
let currentValue = self.counter
self.lock.unlock()
return currentValue
}
}
```protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<T>: PipelineProtocol {
typealias Output = T
private var value: T
init(value: T) {
self.value = value
}
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
return Pipeline<U>(value: transform(value))
}
func execute() -> T {
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
private var value: T
init(value: T) {
self.value = value
}
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
return Pipeline<U>(value: transform(value))
}
func execute() -> T {
return value
}
}
```init(value: T) { // 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 var value: T
init(value: T) {
self.value = value
}
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
return Pipeline<U>(value: transform(value))
}
func execute() -> T {
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
private var value: T
init(value: T) {
self.value = value
}
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
return Pipeline<U>(value: transform(value))
}
func execute() -> T {
return value
}
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes.
// Ensure the final output is produced by sequentially applying transformations starting from an initial value.
class Pipeline<T>: PipelineProtocol {
typealias Output = T
private var value: T
init(value: T) {
self.value = value
}
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
return Pipeline<U>(value: transform(value))
}
func execute() -> T {
return value
}
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes.
// Ensure the final output is produced by sequentially applying transformations starting from an initial value.
class Pipeline<T>: PipelineProtocol {
typealias Output = T
private var value: T
init(value: T) {
self.value = value
}
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
return Pipeline<U>(value: transform(value))
}
func execute() -> T {
return value
}
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes.
// Ensure the final output is produced by sequentially applying transformations starting from an initial value.
class Pipeline<T>: PipelineProtocol {
typealias Output = T
private var value: T
init(value: T) {
self.value = value
}
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
return Pipeline<U>(value: transform(value))
}
func execute() -> T {
return value
}
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes.
// Ensure the final output is produced by sequentially applying transformations starting from an initial value.
class Pipeline<T>: PipelineProtocol {
typealias Output = T
private var value: T
init(value: T) {
self.value = value
}
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
return Pipeline<U>(value: transform(value))
}
func execute() -> T {
return value
}
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes.
// Ensure the final output is produced by sequentially applying transformations starting from an initial value.
class Pipeline<T>: PipelineProtocol {
typealias Output = T
private var value: T
init(value: T) {
self.value = value
}
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
return Pipeline<U>(value: transform(value))
}
func execute() -> T {
return value
}
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes.
// Ensure the final output is produced by sequentially applying transformations starting from an initial value.
class Pipeline<T>: PipelineProtocol {
typealias Output = T
private var value: T
init(value: T) {
self.value = value
}
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
return Pipeline<U>(value: transform(value))
}
func execute() -> T {
return value
}
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes.
// Ensure the final output is produced by sequentially applying transformations starting from an initial value.
class Pipeline<T>: PipelineProtocol {
typealias Output = T
private var value: T
init(value: T) {
self.value = value
}
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
return Pipeline<U>(value: transform(value))
}
func execute() -> T {
return value
}
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes.
// Ensure the final output is producedinit(value: T) { // 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 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
private 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
}
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes.
// Ensure the final output is produced by sequentially applying transformations starting from an initial value.
class Pipeline<T>: PipelineProtocol {
typealias Output = T
private var value: Output
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
}
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes.
// Ensure the final output is produced by sequentially applying transformations starting from an initial value.
class Pipeline<T>: PipelineProtocol {
typealias Output = T
private var value: Output
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
}
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes.
// Ensure the final output is produced by sequentially applying transformations starting from an initial value.
class Pipeline<T>: PipelineProtocol {
typealias Output = T
private var value: Output
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
}
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes.
// Ensure the final output is produced by sequentially applying transformations starting from an initial value.
class Pipeline<T>: PipelineProtocol {
typealias Output = T
private var value: Output
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
}
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes.
// Ensure the final output is produced by sequentially applying transformations starting from an initial value.
class Pipeline<T>: PipelineProtocol {
typealias Output = T
private var value: Output
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
}
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes.
// Ensure the final output is produced by sequentially applying transformations starting from an initial value.
class Pipeline<T>: PipelineProtocol {
typealias Output = T
private var value: Output
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
}
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes.
// Ensure the final output is produced by sequentially applying transformations starting from an initial value.
class Pipeline<T>: PipelineProtocol {
typealias Output = T
private var value: Output
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
}
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes.
// Ensure the final output is producedinit(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 var value: T
init(value: T) {
self.value = value
}
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
return Pipeline<U>(value: transform(value))
}
func execute() -> T {
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
private var value: T
init(value: T) {
self.value = value
}
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
return Pipeline<U>(value: transform(value))
}
func execute() -> T {
return value
}
}
```init(value: T) { // 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 var value: T
required init(value: T) {
self.value = value
}
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
return Pipeline<U>(value: transform(value))
}
func execute() -> T {
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
private var value: T
required init(value: T) {
self.value = value
}
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
return Pipeline<U>(value: transform(value))
}
func execute() -> T {
return value
}
}
// MARK: - Usage
let pipeline = Pipeline(value: 1)
.pipe { $0 * 2 }
.pipe { $0 + 1 }
.pipe { String(describing: $0) }
.pipe { $0 + "!" }
.execute()
print(pipeline) // "3!"
```protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<T>: PipelineProtocol {
typealias Output = T
private var value: T
required init(value: T) {
self.value = value
}
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
return Pipeline<U>(value: transform(value))
}
func execute() -> T {
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
private var value: T
required init(value: T) {
self.value = value
}
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
return Pipeline<U>(value: transform(value))
}
func execute() -> T {
return value
}
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes.
// Ensure the final output is produced by sequentially applying transformations starting from an initial value.
class Pipeline<T>: PipelineProtocol {
typealias Output = T
private var value: T
required init(value: T) {
self.value = value
}
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
return Pipeline<U>(value: transform(value))
}
func execute() -> T {
return value
}
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes.
// Ensure the final output is produced by sequentially applying transformations starting from an initial value.
class Pipeline<T>: PipelineProtocol {
typealias Output = T
private var value: T
required init(value: T) {
self.value = value
}
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
return Pipeline<U>(value: transform(value))
}
func execute() -> T {
return value
}
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes.
// Ensure the final output is produced by sequentially applying transformations starting from an initial value.
class Pipeline<T>: PipelineProtocol {
typealias Output = T
private var value: T
required init(value: T) {
self.value = value
}
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
return Pipeline<U>(value: transform(value))
}
func execute() -> T {
return value
}
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes.
// Ensure the final output is produced by sequentially applying transformations starting from an initial value.
class Pipeline<T>: PipelineProtocol {
typealias Output = T
private var value: T
required init(value: T) {
self.value = value
}
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
return Pipeline<U>(value: transform(value))
}
func execute() -> T {
return value
}
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes.
// Ensure the final output is produced by sequentially applying transformations starting from an initial value.
class Pipeline<T>: PipelineProtocol {
typealias Output = T
private var value: T
required init(value: T) {
self.value = value
}
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
return Pipeline<U>(value: transform(value))
}
func execute() -> T {
return value
}
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes.
// Ensure the final output is produced by sequentially applying transformations starting from an initial value.
class Pipeline<T>: PipelineProtocol {
typealias Output = T
private var value: T
required init(value: T) {
self.value = value
}
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
return Pipeline<U>(value: transform(value))
}
func execute() -> T {
return value
}
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes.
// Ensure the final output is produced by sequentially applying transformations starting from an initial value.
class Pipeline<T>: PipelineProtocol {
typealias Output = T
private var value: T
required init(value: T) {
self.value = value
}
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
return Pipeline<U>(value: transform(value))
}
func execute() -> T {
return value
}
}
// Functional pipeline builder class conforming to a protocol, allowing chaining transformations with type changes. protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<T>: PipelineProtocol {
typealias Output = T
private var value: T
required init(value: T) {
self.value = value
}
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
return Pipeline<U>(value: transform(value))
}
func execute() -> T {
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
private var value: T
required init(value: T) {
self.value = value
}
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
return Pipeline<U>(value: transform(value))
}
func execute() -> T {
return value
}
}
```protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<T>: PipelineProtocol {
typealias Output = T
var value: T
required init(value: T) {
self.value = value
}
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
return Pipeline<U>(value: transform(value))
}
func execute() -> T {
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: T
required init(value: T) {
self.value = value
}
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
return Pipeline<U>(value: transform(value))
}
func execute() -> T {
return value
}
}
// MARK: - Example
let pipeline = Pipeline<Int>(value: 10)
.pipe { $0 * 2 }
.pipe { $0 + 10 }
.pipe { $0 / 2 }
.pipe { $0 - 5 }
.execute()
print(pipeline) // 10
```protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<T>: PipelineProtocol {
typealias Output = T
private var value: T
required init(value: T) {
self.value = value
}
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
return Pipeline<U>(value: transform(value))
}
func execute() -> T {
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
private var value: T
required init(value: T) {
self.value = value
}
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
return Pipeline<U>(value: transform(value))
}
func execute() -> T {
return value
}
}
// MARK: - Examples
// Example 1:
let pipeline = Pipeline(value: 10)
.pipe { $0 * 2 }
.pipe { String(describing: $0) }
.pipe { $0 + "!" }
.execute()
print(pipeline) // "20!"
// Example 2:
let pipeline2 = Pipeline(value: "Hello")
.pipe { $0 + " World" }
.pipe { $0.uppercased() }
.execute()
print(pipeline2) // "HELLO WORLD"
```protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<T>: PipelineProtocol {
typealias Output = T
private var value: T
required init(value: T) {
self.value = value
}
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
return Pipeline<U>(value: transform(value))
}
func execute() -> T {
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
private var value: T
required init(value: T) {
self.value = value
}
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
return Pipeline<U>(value: transform(value))
}
func execute() -> T {
return value
}
}
```protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
class ObservableProperty<Value> : ObservablePropertyProtocol {
typealias Value = Value
private var observers = [UUID: (Value) -> Void]()
private var value: Value
private var nextObserverId = 0
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers[id] = observer
return id
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
func setValue(_ newValue: Value) {
value = newValue
for (_, observer) in observers {
observer(value)
}
}
}```swift
protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
// Generic observable property that notifies observers of value changes.
class ObservableProperty<Value> : ObservablePropertyProtocol {
typealias Value = Value
private var observers = [UUID: (Value) -> Void]()
private var value: Value
private var nextObserverId = 0
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers[id] = observer
return id
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
func setValue(_ newValue: Value) {
value = newValue
for (_, observer) in observers {
observer(value)
}
}
}
```private var value: Value // property 'value' must be declared internal because it matches a requirement in internal protocol 'ObservablePropertyProtocol'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 Value = Value
private var observers = [UUID: (Value) -> Void]()
private var value: Value
private var nextObserverId = 0
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.removeValue(forKey: observer)
}
func update(value: Value) {
self.value = value
for (_, observer) in observers {
observer(value)
}
}
}```swift
protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
// Generic observable property that notifies observers of value changes.
class ObservableProperty<Value> : ObservablePropertyProtocol {
typealias Value = Value
private var observers = [UUID: (Value) -> Void]()
private var value: Value
private var nextObserverId = 0
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.removeValue(forKey: observer)
}
func update(value: Value) {
self.value = value
for (_, observer) in observers {
observer(value)
}
}
}
```private var value: Value // property 'value' must be declared internal because it matches a requirement in internal protocol 'ObservablePropertyProtocol'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 Value = Value
private var observers = [UUID: (Value) -> Void]()
private var _value: Value
var value: Value {
get {
return _value
}
set {
_value = newValue
for (_, observer) in observers {
observer(newValue)
}
}
}
init(value: Value) {
_value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
return uuid
}
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 {
typealias Value = Value
private var observers = [UUID: (Value) -> Void]()
private var _value: Value
var value: Value {
get {
return _value
}
set {
_value = newValue
for (_, observer) in observers {
observer(newValue)
}
}
}
init(value: Value) {
_value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
return uuid
}
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 Value = Value
private var observers = [UUID: (Value) -> Void]()
private var value: Value
private var nextObserverId = 0
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers[id] = observer
return id
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
func setValue(_ newValue: Value) {
value = newValue
observers.values.forEach { $0(newValue) }
}
}```swift
protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
// Generic observable property that notifies observers of value changes.
class ObservableProperty<Value> : ObservablePropertyProtocol {
typealias Value = Value
private var observers = [UUID: (Value) -> Void]()
private var value: Value
private var nextObserverId = 0
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers[id] = observer
return id
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
func setValue(_ newValue: Value) {
value = newValue
observers.values.forEach { $0(newValue) }
}
}
```private var value: Value // property 'value' must be declared internal because it matches a requirement in internal protocol 'ObservablePropertyProtocol'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
var value: Value {
get {
return _value
}
set {
_value = newValue
for (_, observer) in observers {
observer(_value)
}
}
}
init(value: Value) {
_value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
return uuid
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
}
class Property<Value> : ObservablePropertyProtocol {
private var observers = [UUID: (Value) -> Void]()
private var _value: Value
var value: Value {
get {
return _value
}
set {
_value = newValue
for (_, observer) in observers {
observer(_value)
}
}
}
init(value: Value) {
_value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
return uuid
}
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
for (_, observer) in observers {
observer(_value)
}
}
}
init(value: Value) {
_value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
return uuid
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
}
// A property that notifies observers of value changes.
class Property<Value> : ObservablePropertyProtocol {
private var observers = [UUID: (Value) -> Void]()
private var _value: Value
var value: Value {
get {
return _value
}
set {
_value = newValue
for (_, observer) in observers {
observer(_value)
}
}
}
init(value: Value) {
_value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
return uuid
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
}
// A property that notifies observers of value changes.
class Property<Value> : ObservablePropertyProtocol {
private var observers = [UUID: (Value) -> Void]()
private var _value: Value
var value: Value {
get {
return _value
}
set {
_value = newValue
for (_, observer) in observers {
observer(_value)
}
}
}
init(value: Value) {
_value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
return uuid
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
}
// A property that notifies observers of value changes.
class Property<Value> : ObservablePropertyProtocol {
private var observers = [UUID: (Value) -> Void]()
private var _value: Value
var value: Value {
get {
return _value
}
set {
_value = newValue
for (_, observer) in observers {
observer(_value)
}
}
}
init(value: Value) {
_value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
return uuid
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
}
// A property that notifies observers of value changes.
class Property<Value> : ObservablePropertyProtocol {
private var observers = [UUID: (Value) -> Void]()
private var _value: Value
var value: Value {
get {
return _value
}
set {
_value = newValue
for (_, observer) in observers {
observer(_value)
}
}
}
init(value: Value) {
_value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
return uuid
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
}
// A property that notifies observers of value changes.
class Property<Value> : ObservablePropertyProtocol {
private var observers = [UUID: (Value) -> Void]()
private var _value: Value
var value: Value {
get {
return _value
}
set {
_value = newValue
for (_, observer) in observers {
observer(_value)
}
}
}
init(value: Value) {
_value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
return uuid
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
}
// A property that notifies observers of value changes.
class Property<Value> : ObservablePropertyProtocol {
private var observers = [UUID: (Value) -> Void]()
private var _value: Value
var value: Value {
get {
return _valueinit(value: Value) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ObservableProperty<Value>'init(value: Value) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'Property<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 nextObserverId = 0
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 observerId = UUID()
self.observers[observerId] = observer
return observerId
}
func unsubscribe(_ observer: UUID) {
self.observers.removeValue(forKey: observer)
}
private func notifyObservers() {
for (_, observer) in self.observers {
observer(self._value)
}
}
}```swift
protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
// Generic observable property that notifies observers of value changes.
class ObservableProperty<Value> : ObservablePropertyProtocol {
private var observers = [UUID: (Value) -> Void]()
private var nextObserverId = 0
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 observerId = UUID()
self.observers[observerId] = observer
return observerId
}
func unsubscribe(_ observer: UUID) {
self.observers.removeValue(forKey: observer)
}
private func notifyObservers() {
for (_, observer) in self.observers {
observer(self._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 Value = Value
private var observers = [UUID: (Value) -> Void]()
private var _value: Value
var value: Value {
get {
return _value
}
set {
_value = newValue
for (_, observer) in observers {
observer(newValue)
}
}
}
init(value: Value) {
self._value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
return uuid
}
func unsubscribe(_ observer: UUID) {
observers[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 {
typealias Value = Value
private var observers = [UUID: (Value) -> Void]()
private var _value: Value
var value: Value {
get {
return _value
}
set {
_value = newValue
for (_, observer) in observers {
observer(newValue)
}
}
}
init(value: Value) {
self._value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
return uuid
}
func unsubscribe(_ observer: UUID) {
observers[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 Value = Value
private var observers = [UUID: (Value) -> Void]()
private var value: Value
private var nextObserverId = 0
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let observerId = UUID()
observers[observerId] = observer
return observerId
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
func notifyObservers() {
for (_, observer) in observers {
observer(value)
}
}
}```swift
protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
// Generic observable property that notifies observers of value changes.
class ObservableProperty<Value> : ObservablePropertyProtocol {
typealias Value = Value
private var observers = [UUID: (Value) -> Void]()
private var value: Value
private var nextObserverId = 0
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let observerId = UUID()
observers[observerId] = observer
return observerId
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
func notifyObservers() {
for (_, observer) in observers {
observer(value)
}
}
}
// A property that notifies observers of value changes.
class ObservableProperty<Value> : ObservablePropertyProtocol {
typealias Value = Value
private var observers = [UUID: (Value) -> Void]()
private var value: Value
private var nextObserverId = 0
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let observerId = UUID()
observers[observerId] = observer
return observerId
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
func notifyObservers() {
for (_, observer) in observers {
observer(value)
}
}
}
// A property that notifies observers of value changes.
class ObservableProperty<Value> : ObservablePropertyProtocol {
typealias Value = Value
private var observers = [UUID: (Value) -> Void]()
private var value: Value
private var nextObserverId = 0
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let observerId = UUID()
observers[observerId] = observer
return observerId
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
func notifyObservers() {
for (_, observer) in observers {
observer(value)
}
}
}
// A property that notifies observers of value changes.
class ObservableProperty<Value> : ObservablePropertyProtocol {
typealias Value = Value
private var observers = [UUID: (Value) -> Void]()
private var value: Value
private var nextObserverId = 0
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let observerId = UUID()
observers[observerId] = observer
return observerId
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
func notifyObservers() {
for (_, observer) in observers {
observer(value)
}
}
}
// A property that notifies observers of value changes.
class ObservableProperty<Value> : ObservablePropertyProtocol {
typealias Value = Value
private var observers = [UUID: (Value) -> Void]()
private var value: Value
private var nextObserverId = 0
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let observerId = UUID()
observers[observerId] = observer
return observerId
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
func notifyObservers() {
for (_, observer) in observers {
observer(value)
}
}
}
// A property that notifies observers of value changes.
class ObservableProperty<Value> : ObservablePropertyProtocol {
typealias Value = Value
private var observers = [UUID: (Value) -> Void]()
private var value: Value
private var nextObserverId = 0
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let observerId = UUID()
observers[observerId] = observer
return observerId
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
func notifyObservers() {
for (_, observer) in observers {
observer(value)
}
}
}
// A property that notifies observers of value changes.
class ObservableProperty<Value> : ObservablePropertyProtocol {
typealias Value = Value
private var observers = [UUID: (Value) -> Void]()
private var value: Value
privateprivate var value: Value // property 'value' must be declared internal because it matches a requirement in internal protocol 'ObservablePropertyProtocol'init(value: Value) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ObservableProperty<Value>'protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
class ObservableProperty<Value> : ObservablePropertyProtocol {
private var observers = [UUID: (Value) -> Void]()
private var nextObserverId = UUID()
private var _value: Value
init(value: Value) {
self._value = value
}
var value: Value {
get {
return _value
}
set {
if _value!= newValue {
_value = newValue
observers.values.forEach { $0(_value) }
}
}
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = nextObserverId
observers[id] = observer
nextObserverId = UUID()
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 nextObserverId = UUID()
private var _value: Value
init(value: Value) {
self._value = value
}
var value: Value {
get {
return _value
}
set {
if _value!= newValue {
_value = newValue
observers.values.forEach { $0(_value) }
}
}
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = nextObserverId
observers[id] = observer
nextObserverId = UUID()
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>'if _value!= newValue { // cannot force unwrap value of non-optional type 'Value'if _value!= newValue { // use of '=' in a boolean context, did you mean '=='?if _value!= newValue { // '=' must have consistent whitespace on both sidesprotocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
class ObservableProperty<Value> : ObservablePropertyProtocol {
typealias Value = Value
private var observers = [UUID: (Value) -> Void]()
private var value: Value
private var nextObserverId = 0
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let observerId = UUID()
observers[observerId] = observer
return observerId
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
func setValue(_ newValue: Value) {
value = newValue
for (_, observer) in observers {
observer(value)
}
}
}```swift
protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
// Generic observable property that notifies observers of value changes.
class ObservableProperty<Value> : ObservablePropertyProtocol {
typealias Value = Value
private var observers = [UUID: (Value) -> Void]()
private var value: Value
private var nextObserverId = 0
init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let observerId = UUID()
observers[observerId] = observer
return observerId
}
func unsubscribe(_ observer: UUID) {
observers[observer] = nil
}
func setValue(_ newValue: Value) {
value = newValue
for (_, observer) in observers {
observer(value)
}
}
}
```private var value: Value // property 'value' must be declared internal because it matches a requirement in internal protocol 'ObservablePropertyProtocol'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>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue.clamped(to: range)
self.range = range
}
}```swift
protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue.clamped(to: range)
self.range = range
}
}
```self.wrappedValue = wrappedValue.clamped(to: range) // value of type 'Value' has no member 'clamped'protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
private var value: Value
private let range: ClosedRange<Value>
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) }
}
}
struct User {
@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>: ClampedProtocol {
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) }
}
}
struct User {
@Clamped(0...100) var age: Int
}
var user = User(age: 101)
print(user.age) // 100
user.age = -1
print(user.age) // 0
```@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>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue.clamped(to: range)
self.range = range
}
}```swift
protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue.clamped(to: range)
self.range = range
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue.clamped(to: range)
self.range = range
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue.clamped(to: range)
self.range = range
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue.clamped(to: range)
self.range = range
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue.clamped(to: range)
self.range = range
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue.clamped(to: range)
self.range = range
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue.clamped(to: range)
self.range = range
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue.clamped(to: range)
self.range = range
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue.clamped(to: range)
self.range = range
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue.clamped(to: range)
self.range = range
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue.clamped(to: range)
self.range = range
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Valueself.wrappedValue = wrappedValue.clamped(to: range) // value of type 'Value' has no member 'clamped'protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
private var value: Value
private let range: ClosedRange<Value>
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) }
}
}
struct Foo {
@Clamped(0...100) var bar: Int
}```swift
protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
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) }
}
}
struct Foo {
@Clamped(0...100) var bar: Int
}
var foo = Foo(bar: 1000)
foo.bar // 100
foo.bar = -1000
foo.bar // 0
```@Clamped(0...100) var bar: Int // missing argument for parameter 'wrappedValue' in callprotocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
private var value: Value
private let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = wrappedValue
self.range = range
}
var wrappedValue: Value {
get { value }
set { value = min(max(range.lowerBound, newValue), range.upperBound) }
}
}```swift
protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
private var value: Value
private let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = wrappedValue
self.range = range
}
var wrappedValue: Value {
get { value }
set { value = min(max(range.lowerBound, newValue), range.upperBound) }
}
}
```protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
private var value: Value
private let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = wrappedValue
self.range = range
}
var wrappedValue: Value {
get { value }
set { value = min(max(range.lowerBound, newValue), range.upperBound) }
}
}
struct Point {
@Clamped(0...100) var x: Int
@Clamped(0...100) var y: 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>: ClampedProtocol {
private var value: Value
private let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = wrappedValue
self.range = range
}
var wrappedValue: Value {
get { value }
set { value = min(max(range.lowerBound, newValue), range.upperBound) }
}
}
struct Point {
@Clamped(0...100) var x: Int
@Clamped(0...100) var y: Int
}
var point = Point(x: 101, y: 101)
print(point.x) // 100
print(point.y) // 100
```@Clamped(0...100) var x: Int // missing argument for parameter 'wrappedValue' in call@Clamped(0...100) var y: Int // missing argument for parameter 'wrappedValue' in callprotocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue.clamped(to: range)
self.range = range
}
}```swift
protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue.clamped(to: range)
self.range = range
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue.clamped(to: range)
self.range = range
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue.clamped(to: range)
self.range = range
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue.clamped(to: range)
self.range = range
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue.clamped(to: range)
self.range = range
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue.clamped(to: range)
self.range = range
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue.clamped(to: range)
self.range = range
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue.clamped(to: range)
self.range = range
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue.clamped(to: range)
self.range = range
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue.clamped(to: range)
self.range = range
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.wrappedValue = wrappedValue.clamped(to: range)
self.range = range
}
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var wrappedValue: Value
let range: ClosedRange<Valueself.wrappedValue = wrappedValue.clamped(to: range) // value of type 'Value' has no member 'clamped'protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<T: Comparable>: ClampedProtocol {
var value: T
let range: ClosedRange<T>
init(wrappedValue: T, _ range: ClosedRange<T>) {
self.range = range
self.value = min(max(wrappedValue, range.lowerBound), range.upperBound)
}
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>: ClampedProtocol {
var value: T
let range: ClosedRange<T>
init(wrappedValue: T, _ range: ClosedRange<T>) {
self.range = range
self.value = min(max(wrappedValue, range.lowerBound), range.upperBound)
}
var wrappedValue: T {
get { value }
set { value = min(max(newValue, range.lowerBound), range.upperBound) }
}
}
```protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
private var value: Value
private let range: ClosedRange<Value>
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) }
}
}
struct Foo {
@Clamped(0...100) var bar: Int
}```swift
protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
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) }
}
}
struct Foo {
@Clamped(0...100) var bar: Int
}
var foo = Foo(bar: 101)
print(foo.bar) // 100
foo.bar = -1
print(foo.bar) // 0
```@Clamped(0...100) var bar: Int // missing argument for parameter 'wrappedValue' in callprotocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var value: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = wrappedValue
self.range = range
self.value = clamp(value, range)
}
var wrappedValue: Value {
get { value }
set { value = clamp(newValue, range) }
}
private func clamp(_ value: Value, _ range: ClosedRange<Value>) -> Value {
if value < range.lowerBound {
return range.lowerBound
} else if value > range.upperBound {
return range.upperBound
} else {
return value
}
}
}
struct Foo {
@Clamped(0...100) var bar: Int
}```swift
protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
var value: Value
let range: ClosedRange<Value>
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = wrappedValue
self.range = range
self.value = clamp(value, range)
}
var wrappedValue: Value {
get { value }
set { value = clamp(newValue, range) }
}
private func clamp(_ value: Value, _ range: ClosedRange<Value>) -> Value {
if value < range.lowerBound {
return range.lowerBound
} else if value > range.upperBound {
return range.upperBound
} else {
return value
}
}
}
// Usage
struct Foo {
@Clamped(0...100) var bar: Int
}
var foo = Foo(bar: 101)
print(foo.bar) // 100
foo.bar = -1
print(foo.bar) // 0
```@Clamped(0...100) var bar: Int // missing argument for parameter 'wrappedValue' in callenum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<Value> : LoggedProtocol {
var wrappedValue: Value
var logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Logged<Value> {
self
}
subscript(wrapped wrappedValue: inout Value) -> Value {
get {
logger(.get, wrappedValue)
return wrappedValue
}
set {
logger(.set, newValue)
wrappedValue = newValue
}
}
}```swift
enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value> : LoggedProtocol {
var wrappedValue: Value
var logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Logged<Value> {
self
}
subscript(wrapped wrappedValue: inout Value) -> Value {
get {
logger(.get, wrappedValue)
return wrappedValue
}
set {
logger(.set, newValue)
wrappedValue = newValue
}
}
}
// A property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value> : LoggedProtocol {
var wrappedValue: Value
var logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Logged<Value> {
self
}
subscript(wrapped wrappedValue: inout Value) -> Value {
get {
logger(.get, wrappedValue)
return wrappedValue
}
set {
logger(.set, newValue)
wrappedValue = newValue
}
}
}
// A property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value> : LoggedProtocol {
var wrappedValue: Value
var logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Logged<Value> {
self
}
subscript(wrapped wrappedValue: inout Value) -> Value {
get {
logger(.get, wrappedValue)
return wrappedValue
}
set {
logger(.set, newValue)
wrappedValue = newValue
}
}
}
// A property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value> : LoggedProtocol {
var wrappedValue: Value
var logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Logged<Value> {
self
}
subscript(wrapped wrappedValue: inout Value) -> Value {
get {
logger(.get, wrappedValue)
return wrappedValue
}
set {
logger(.set, newValue)
wrappedValue = newValue
}
}
}
// A property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value> : LoggedProtocol {
var wrappedValue: Value
var logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Logged<Value> {
self
}
subscript(wrapped wrappedValue: inout Value) -> Value {
get {
logger(.get, wrappedValue)
return wrappedValue
}
set {
logger(.set, newValue)
wrappedValue = newValue
}
}
}
// A property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value> : LoggedProtocol {
var wrappedValue: Value
var logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Logged<Value> {
self
}
subscript(wrapped wrappedValue: inout Value) -> Value {
get {
logger(.get, wrappedValue)
return wrappedValue
}
set {
logger(.set, newValue)
wrappedValue = newValue
}
}
}
// A property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value> : LoggedProtocol {
var wrappedValue: Value
var logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Logged<Value> {
self
}
subscript(wrapped wrappedValue: inoutsubscript(wrapped wrappedValue: inout Value) -> Value { // 'inout' must not be used on subscript parametersenum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<T>: LoggedProtocol {
private var value: T
private let logger: (Event, T) -> Void
init(wrappedValue: T, logger: @escaping (Event, T) -> Void) {
self.value = wrappedValue
self.logger = logger
}
var wrappedValue: T {
get {
logger(.get, value)
return value
}
set {
logger(.set, value)
value = newValue
}
}
}
struct User {
@Logged(logger: { event, value in
print("\(event) \(value)")
})
var name: String
}```swift
enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<T>: LoggedProtocol {
private var value: T
private let logger: (Event, T) -> Void
init(wrappedValue: T, logger: @escaping (Event, T) -> Void) {
self.value = wrappedValue
self.logger = logger
}
var wrappedValue: T {
get {
logger(.get, value)
return value
}
set {
logger(.set, value)
value = newValue
}
}
}
struct User {
@Logged(logger: { event, value in
print("\(event) \(value)")
})
var name: String
}
var user = User(name: "<NAME>")
user.name = "<NAME>"
// Prints "get <NAME>"
// Prints "set <NAME>"
```@Logged(logger: { event, value in // missing argument for parameter 'wrappedValue' in callenum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<T>: LoggedProtocol {
var wrappedValue: T
let logger: (Event, T) -> Void
init(wrappedValue: T, logger: @escaping (Event, T) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Logged<T> {
self
}
mutating func log(_ event: Event) {
logger(event, wrappedValue)
}
}
struct User {
@Logged(logger: logAccess)
var name: String
@Logged(logger: logAccess)
var age: Int
static func logAccess(_ event: Event, _ value: Any) {
print("Logged access to \(value) (\(event))")
}
}```swift
enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<T>: LoggedProtocol {
var wrappedValue: T
let logger: (Event, T) -> Void
init(wrappedValue: T, logger: @escaping (Event, T) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Logged<T> {
self
}
mutating func log(_ event: Event) {
logger(event, wrappedValue)
}
}
struct User {
@Logged(logger: logAccess)
var name: String
@Logged(logger: logAccess)
var age: Int
static func logAccess(_ event: Event, _ value: Any) {
print("Logged access to \(value) (\(event))")
}
}
var user = User(name: "<NAME>", age: 30)
user.name = "<NAME>"
user.age = 31
// Output:
// Logged access to <NAME> (get)
// Logged access to <NAME> (set)
// Logged access to 30 (get)
// Logged access to 31 (set)
```@Logged(logger: logAccess) // missing argument for parameter 'wrappedValue' in call@Logged(logger: logAccess) // missing argument for parameter 'wrappedValue' in callenum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<Value> : LoggedProtocol {
var wrappedValue: Value
var logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Logged<Value> {
self
}
mutating func log(_ event: Event) {
logger(event, wrappedValue)
}
}
struct User {
@Logged(logger: logAccess) var name: String
@Logged(logger: logAccess) var age: Int
}
func logAccess<Value>(_ event: Event, _ value: Value) {
print("\(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 projectedValue: Logged<Value> {
self
}
mutating func log(_ event: Event) {
logger(event, wrappedValue)
}
}
struct User {
@Logged(logger: logAccess) var name: String
@Logged(logger: logAccess) var age: Int
}
func logAccess<Value>(_ event: Event, _ value: Value) {
print("\(event) \(value)")
}
var user = User(name: "<NAME>", age: 30)
user.name = "<NAME>"
user.age = 31
// get <NAME>
// set <NAME>
// get 31
// set 31
```@Logged(logger: logAccess) var name: String // missing argument for parameter 'wrappedValue' in call@Logged(logger: logAccess) var age: Int // missing argument for parameter 'wrappedValue' in callenum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<Value> : LoggedProtocol {
var wrappedValue: Value
var logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Logged<Value> {
self
}
mutating func log(_ event: Event) {
logger(event, wrappedValue)
}
}
extension Logged : CustomStringConvertible {
var description: String {
"Logged(\(wrappedValue))"
}
}
extension Logged : CustomDebugStringConvertible {
var debugDescription: String {
"Logged(\(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 projectedValue: Logged<Value> {
self
}
mutating func log(_ event: Event) {
logger(event, wrappedValue)
}
}
extension Logged : CustomStringConvertible {
var description: String {
"Logged(\(wrappedValue))"
}
}
extension Logged : CustomDebugStringConvertible {
var debugDescription: String {
"Logged(\(wrappedValue))"
}
}
``` // XCTAssertEqual failed: ([]) is not equal to (["Accessing value: 0"])enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<Value>: LoggedProtocol {
var wrappedValue: Value
var logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Logged<Value> {
self
}
mutating func log(_ event: Event) {
logger(event, wrappedValue)
}
}
extension Logged: ExpressibleByIntegerLiteral {
init(integerLiteral value: IntegerLiteralType) {
self.init(wrappedValue: value, logger: { event, value in
print("Logged \(event) of \(value)")
})
}
}
extension Logged: ExpressibleByFloatLiteral {
init(floatLiteral value: FloatLiteralType) {
self.init(wrappedValue: value, logger: { event, value in
print("Logged \(event) of \(value)")
})
}
}
extension Logged: ExpressibleByStringLiteral {
init(stringLiteral value: StringLiteralType) {
self.init(wrappedValue: value, logger: { event, value in
print("Logged \(event) of \(value)")
})
}
}
extension Logged: ExpressibleByBooleanLiteral {
init(booleanLiteral value: BooleanLiteralType) {
self.init(wrappedValue: value, logger: { event, value in
print("Logged \(event) of \(value)")
})
}
}
extension Logged: ExpressibleByArrayLiteral {
init(arrayLiteral elements: Value...) {
self.init(wrappedValue: elements, logger: { event, value in
print("Logged \(event) of \(value)")
})
}
}
extension Logged: ExpressibleByDictionaryLiteral {
init(dictionaryLiteral elements: (Key, Value)...) {
self.init(wrappedValue: elements, logger: { event, value in
print("Logged \(event) of \(value)")
})
}
}
struct User {
@Logged var age: Int
@Logged var name: String
@Logged var isAdmin: Bool
@Logged var friends: [String]
@Logged var settings: [String: Any]
}```swift
enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value>: LoggedProtocol {
var wrappedValue: Value
var logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Logged<Value> {
self
}
mutating func log(_ event: Event) {
logger(event, wrappedValue)
}
}
extension Logged: ExpressibleByIntegerLiteral {
init(integerLiteral value: IntegerLiteralType) {
self.init(wrappedValue: value, logger: { event, value in
print("Logged \(event) of \(value)")
})
}
}
extension Logged: ExpressibleByFloatLiteral {
init(floatLiteral value: FloatLiteralType) {
self.init(wrappedValue: value, logger: { event, value in
print("Logged \(event) of \(value)")
})
}
}
extension Logged: ExpressibleByStringLiteral {
init(stringLiteral value: StringLiteralType) {
self.init(wrappedValue: value, logger: { event, value in
print("Logged \(event) of \(value)")
})
}
}
extension Logged: ExpressibleByBooleanLiteral {
init(booleanLiteral value: BooleanLiteralType) {
self.init(wrappedValue: value, logger: { event, value in
print("Logged \(event) of \(value)")
})
}
}
extension Logged: ExpressibleByArrayLiteral {
init(arrayLiteral elements: Value...) {
self.init(wrappedValue: elements, logger: { event, value in
print("Logged \(event) of \(value)")
})
}
}
extension Logged: ExpressibleByDictionaryLiteral {
init(dictionaryLiteral elements: (Key, Value)...) {
self.init(wrappedValue: elements, logger: { event, value in
print("Logged \(event) of \(value)")
})
}
}
struct User {
@Logged var age: Int
@Logged var name: String
@Logged var isAdmin: Bool
@Logged var friends: [String]
@Logged var settings: [String: Any]
}
var user = User(age: 10, name: "<NAME>", isAdmin: true, friends: ["<NAME>", "<NAME>"], settings: ["notifications": true, "sound": false])
user.age = 11
user.name = "<NAME>"
user.isAdmin = false
user.friends = ["<NAME>", "<NAME>", "<NAME>"]
user.settings = ["notifications": true, "sound": false, "vibration": true]
// Logged get of 11
// Logged set of 11
// Logged get of <NAME>
// Logged set of <NAME>
// Logged get of false
// Logged set of false
// Logged get of ["<NAME>", "<NAME>", "<NAME>"]
// Logged set of ["<NAME>", "<NAME>", "<NAME>"]
// Logged get of ["notifications": true, "sound": false, "vibration": true]
// Logged set of ["notifications": true, "sound": false, "vibration": true]
```self.init(wrappedValue: value, logger: { event, value in // cannot convert value of type 'IntegerLiteralType' (aka 'Int') to expected argument type 'Value'self.init(wrappedValue: value, logger: { event, value in // cannot convert value of type 'FloatLiteralType' (aka 'Double') to expected argument type 'Value'self.init(wrappedValue: value, logger: { event, value in // cannot convert value of type 'StringLiteralType' (aka 'String') to expected argument type 'Value'self.init(wrappedValue: value, logger: { event, value in // cannot convert value of type 'BooleanLiteralType' (aka 'Bool') to expected argument type 'Value'self.init(wrappedValue: elements, logger: { event, value in // cannot convert value of type 'Value...' to expected argument type 'Value'extension Logged: ExpressibleByDictionaryLiteral { // type 'Logged<Value>' does not conform to protocol 'ExpressibleByDictionaryLiteral'init(dictionaryLiteral elements: (Key, Value)...) { // reference to invalid associated type 'Key' of type 'Logged<Value>'enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<T>: LoggedProtocol {
var wrappedValue: T
var logger: (Event, T) -> Void
init(wrappedValue: T, logger: @escaping (Event, T) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Logged<T> {
return self
}
mutating func log(_ event: Event) {
logger(event, wrappedValue)
}
}
struct User {
@Logged(logger: logAccess) var name: String
@Logged(logger: logAccess) var age: Int
}
func logAccess<T>(_ event: Event, _ value: T) {
print("\(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<T>: LoggedProtocol {
var wrappedValue: T
var logger: (Event, T) -> Void
init(wrappedValue: T, logger: @escaping (Event, T) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Logged<T> {
return self
}
mutating func log(_ event: Event) {
logger(event, wrappedValue)
}
}
struct User {
@Logged(logger: logAccess) var name: String
@Logged(logger: logAccess) var age: Int
}
func logAccess<T>(_ event: Event, _ value: T) {
print("\(event) \(value)")
}
var user = User(name: "<NAME>", age: 30)
user.name = "<NAME>"
user.age = 31
// Output:
// get <NAME>
// set <NAME>
// get 30
// set 31
```@Logged(logger: logAccess) var name: String // missing argument for parameter 'wrappedValue' in call@Logged(logger: logAccess) var age: Int // missing argument for parameter 'wrappedValue' in callenum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<Value> {
var wrappedValue: Value
var logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: LoggedProtocol<Value> {
LoggedProtocol<Value>(wrappedValue: wrappedValue, logger: logger)
}
}
extension LoggedProtocol {
var wrappedValue: Value {
get {
logger(.get, wrappedValue)
return wrappedValue
}
set {
logger(.set, newValue)
wrappedValue = newValue
}
}
}
struct User {
@Logged(logger: logAccess) var name: String
}
func logAccess(_ event: Event, _ value: String) {
print("\(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> {
var wrappedValue: Value
var logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: LoggedProtocol<Value> {
LoggedProtocol<Value>(wrappedValue: wrappedValue, logger: logger)
}
}
extension LoggedProtocol {
var wrappedValue: Value {
get {
logger(.get, wrappedValue)
return wrappedValue
}
set {
logger(.set, newValue)
wrappedValue = newValue
}
}
}
struct User {
@Logged(logger: logAccess) var name: String
}
func logAccess(_ event: Event, _ value: String) {
print("\(event) \(value)")
}
var user = User(name: "<NAME>")
user.name = "<NAME>"
print(user.$name.wrappedValue)
// Prints "get <NAME>"
// Prints "set <NAME>"
// Prints "<NAME>"
```var projectedValue: LoggedProtocol<Value> { // protocol 'LoggedProtocol' does not have primary associated types that can be constrainedlogger(.get, wrappedValue) // cannot infer contextual base in reference to member 'get'logger(.get, wrappedValue) // cannot find 'logger' in scopereturn wrappedValue // attempting to access 'wrappedValue' within its own getterlogger(.set, newValue) // cannot infer contextual base in reference to member 'set'logger(.set, newValue) // cannot find 'logger' in scopewrappedValue = newValue // attempting to modify 'wrappedValue' within its own setter@Logged(logger: logAccess) var name: String // missing argument for parameter 'wrappedValue' in callenum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<Value> : LoggedProtocol {
var wrappedValue: Value
var logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Logged<Value> {
get { self }
set { self = newValue }
}
mutating func update(newValue: Value) {
logger(.set, newValue)
wrappedValue = newValue
}
}```swift
enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value> : LoggedProtocol {
var wrappedValue: Value
var logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Logged<Value> {
get { self }
set { self = newValue }
}
mutating func update(newValue: Value) {
logger(.set, newValue)
wrappedValue = newValue
}
}
``` // XCTAssertEqual failed: ([]) is not equal to (["Accessing value: 0"])enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<Value>: LoggedProtocol {
var wrappedValue: Value
var logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Logged<Value> { self }
mutating func log(_ event: Event) {
logger(event, wrappedValue)
}
}
extension Logged: CustomStringConvertible {
var description: String {
"Logged(\(wrappedValue))"
}
}
struct User {
@Logged var name: String
}```swift
enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value>: LoggedProtocol {
var wrappedValue: Value
var logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Logged<Value> { self }
mutating func log(_ event: Event) {
logger(event, wrappedValue)
}
}
extension Logged: CustomStringConvertible {
var description: String {
"Logged(\(wrappedValue))"
}
}
struct User {
@Logged var name: String
}
var user = User(name: "<NAME>")
user.name
user.$name.log(.get)
user.name = "<NAME>"
user.$name.log(.set)
``` // XCTAssertEqual failed: ([]) is not equal to (["Accessing value: 0"])protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
return.success(city: String(character), forecast: "Sunny")
case.keyboardDeleteBackwards:
return.failure(city: "Moscow")
case.searchButtonPress:
return.failure(city: "Moscow")
}
}
}
class WeatherViewController: UIViewController {
private let application: WeatherApplicationProtocol
init(application: WeatherApplicationProtocol) {
self.application = application
super.init(nibName: nil, bundle: nil)
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func viewDidLoad() {
super.viewDidLoad()
let action = UserAction.keyboardCharacterSelect("M")
let feedback = application.handle(action: action)
switch feedback {
case.success(let city, let forecast):
print("Success: \(city) - \(forecast)")
case.failure(let city):
print("Failure: \(city)")
case.none:
print("No feedback")
}
}
}```swift
protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
return.success(city: String(character), forecast: "Sunny")
case.keyboardDeleteBackwards:
return.failure(city: "Moscow")
case.searchButtonPress:
return.failure(city: "Moscow")
}
}
}
// Weather application consumer.
// Use WeatherApplication to handle user actions and show results.
class WeatherViewController: UIViewController {
private let application: WeatherApplicationProtocol
init(application: WeatherApplicationProtocol) {
self.application = application
super.init(nibName: nil, bundle: nil)
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func viewDidLoad() {
super.viewDidLoad()
let action = UserAction.keyboardCharacterSelect("M")
let feedback = application.handle(action: action)
switch feedback {
case.success(let city, let forecast):
print("Success: \(city) - \(forecast)")
case.failure(let city):
print("Failure: \(city)")
case.none:
print("No feedback")
}
}
}
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
return.success(city: String(character), forecast: "Sunny")
case.keyboardDeleteBackwards:
return.failure(city: "Moscow")
case.searchButtonPress:
return.failure(city: "Moscow")
}
}
}
// Weather application consumer.
// Use WeatherApplication to handle user actions and show results.
class WeatherViewController: UIViewController {
private let application: WeatherApplicationProtocol
init(application: WeatherApplicationProtocol) {
self.application = application
super.init(nibName: nil, bundle: nil)
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func viewDidLoad() {
super.viewDidLoad()
let action = UserAction.keyboardCharacterSelect("M")
let feedback = application.handle(action: action)
switch feedback {
case.success(let city, let forecast):
print("Success: \(city) - \(forecast)")
case.failure(let city):
print("Failure: \(city)")
case.none:
print("No feedback")
}
}
}
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
return.success(city: String(character), forecast: "Sunny")
case.keyboardDeleteBackwards:
return.failure(city: "Moscow")
case.searchButtonPress:
return.failure(city: "Moscow")
}
}
}
// Weather application consumer.
// Use WeatherApplication to handle user actions and show results.
class WeatherViewController: UIViewController {
private let application: WeatherApplicationProtocol
init(application: WeatherApplicationProtocol) {
self.application = application
super.init(nibName: nil, bundle: nil)
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func viewDidLoad() {
super.viewDidLoad()
let action = UserAction.keyboardCharacterSelect("M")
let feedback = application.handle(action: action)
switch feedback {
case.success(let city, let forecast):
print("Success: \(city) - \(forecast)")
case.failure(let city):
print("Failure: \(city)")
case.none:
print("No feedback")
}
}
}
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class Weatherclass WeatherViewController: UIViewController { // cannot find type 'UIViewController' in scopesuper.init(nibName: nil, bundle: nil) // 'super' members cannot be referenced in a root classoverride func viewDidLoad() { // method does not override any method from its superclasssuper.viewDidLoad() // 'super' members cannot be referenced in a root classprotocol 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.success(city: String(character), forecast: "Sunny")
case.keyboardDeleteBackwards:
return.failure(city: "Moscow")
case.searchButtonPress:
return.failure(city: "Moscow")
}
}
}
class WeatherApplicationDependencies: WeatherApplicationProtocol {
private let provider: WeatherProvider
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
return.success(city: String(character), forecast: "Sunny")
case.keyboardDeleteBackwards:
return.failure(city: "Moscow")
case.searchButtonPress:
return.failure(city: "Moscow")
}
}
}
class WeatherApplicationInteractions: WeatherApplicationProtocol {
private let provider: WeatherProvider
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
return.success(city: String(character), forecast: "Sunny")
case.keyboardDeleteBackwards:
return.failure(city: "Moscow")
case.searchButtonPress:
return.failure(city: "Moscow")
}
}
}```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.success(city: String(character), forecast: "Sunny")
case.keyboardDeleteBackwards:
return.failure(city: "Moscow")
case.searchButtonPress:
return.failure(city: "Moscow")
}
}
}
// Weather application dependencies.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplicationDependencies: WeatherApplicationProtocol {
private let provider: WeatherProvider
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
return.success(city: String(character), forecast: "Sunny")
case.keyboardDeleteBackwards:
return.failure(city: "Moscow")
case.searchButtonPress:
return.failure(city: "Moscow")
}
}
}
// Weather application interactions.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplicationInteractions: WeatherApplicationProtocol {
private let provider: WeatherProvider
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
return.success(city: String(character), forecast: "Sunny")
case.keyboardDeleteBackwards:
return.failure(city: "Moscow")
case.searchButtonPress:
return.failure(city: "Moscow")
}
}
}
// Weather application.
// 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.success(city: String(character), forecast: "Sunny")
case.keyboardDeleteBackwards:
return.failure(city: "Moscow")
case.searchButtonPress:
return.failure(city: "Moscow")
}
}
}
// Weather application.
// 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.success(city: String(character), forecast: "Sunny")
case.keyboardDeleteBackwards:
return.failure(city: "Moscow")
case.searchButtonPress:
return.failure(city: "Moscow")
}
}
}
// Weather application.
// 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.success(city: String(character), forecast: "Sunny")
case.keyboardDeleteBackwards:
return.failure(city: "Moscow")
case.searchButtonPress:
return.failure(city: "Moscow")
}
}
}
// Weather application.
// 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.success(city: String(character), forecast: "Sunny")
case.keyboardDeleteBackwards:
return.failure(city: "Moscow")
case.searchButtonPress:
return.failure(city: "Moscow")
}
}
}
// Weather application.
// Handle user actions to fill search bar results and use WeatherProvider to check forecasttypealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions // 'WeatherApplicationDependencies' is ambiguous for type lookup in this contextclass WeatherApplicationDependencies: WeatherApplicationProtocol { // invalid redeclaration of 'WeatherApplicationDependencies'class WeatherApplicationInteractions: WeatherApplicationProtocol { // invalid redeclaration of 'WeatherApplicationInteractions'protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
return.success(city: String(character), forecast: "Sunny")
case.keyboardDeleteBackwards:
return.failure(city: "New York")
case.searchButtonPress:
return nil
}
}
}
class WeatherApplicationDependenciesProvider: WeatherApplicationDependencies {
required init(provider: WeatherProvider) {
self.provider = provider
}
let provider: WeatherProvider
}
class WeatherApplicationInteractionsProvider: WeatherApplicationInteractions {
let application: WeatherApplication
init(application: WeatherApplication) {
self.application = application
}
func handle(action: UserAction) -> ApplicationFeedback? {
return application.handle(action: action)
}
}
class WeatherApplicationProvider: WeatherApplicationProtocol {
let dependencies: WeatherApplicationDependencies
let interactions: WeatherApplicationInteractions
init(dependencies: WeatherApplicationDependencies, interactions: WeatherApplicationInteractions) {
self.dependencies = dependencies
self.interactions = interactions
}
func handle(action: UserAction) -> ApplicationFeedback? {
return interactions.handle(action: action)
}
}
class WeatherApplicationDependenciesProvider: WeatherApplicationDependencies {
let provider: WeatherProvider
required init(provider: WeatherProvider) {
self.provider = provider
}
}```swift
protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
return.success(city: String(character), forecast: "Sunny")
case.keyboardDeleteBackwards:
return.failure(city: "New York")
case.searchButtonPress:
return nil
}
}
}
// Weather application dependencies.
// Provide WeatherProvider to WeatherApplication.
class WeatherApplicationDependenciesProvider: WeatherApplicationDependencies {
required init(provider: WeatherProvider) {
self.provider = provider
}
let provider: WeatherProvider
}
// Weather application interactions.
// Provide WeatherApplication to WeatherApplicationDependencies.
class WeatherApplicationInteractionsProvider: WeatherApplicationInteractions {
let application: WeatherApplication
init(application: WeatherApplication) {
self.application = application
}
func handle(action: UserAction) -> ApplicationFeedback? {
return application.handle(action: action)
}
}
// Weather application.
// Provide WeatherApplicationDependencies to WeatherApplicationInteractions.
class WeatherApplicationProvider: WeatherApplicationProtocol {
let dependencies: WeatherApplicationDependencies
let interactions: WeatherApplicationInteractions
init(dependencies: WeatherApplicationDependencies, interactions: WeatherApplicationInteractions) {
self.dependencies = dependencies
self.interactions = interactions
}
func handle(action: UserAction) -> ApplicationFeedback? {
return interactions.handle(action: action)
}
}
// Weather application dependencies provider.
// Provide WeatherApplicationDependencies to WeatherApplicationProvider.
class WeatherApplicationDependenciesProvider: WeatherApplicationDependencies {
let provider: WeatherProvider
required init(provider: WeatherProvider) {
self.provider = provider
}
}
// Weather application interactions provider.
// Provide WeatherApplicationInteractions to WeatherApplicationProvider.
class WeatherApplicationInteractionsProvider: WeatherApplicationInteractions {
let application: WeatherApplication
init(application: WeatherApplication) {
self.application = application
}
func handle(action: UserAction) -> ApplicationFeedback? {
return application.handle(action: action)
}
}
// Weather application provider.
// Provide WeatherApplication to WeatherApplicationDependenciesProvider.
class WeatherApplicationProvider: WeatherApplicationProtocol {
let dependencies: WeatherApplicationDependencies
let interactions: WeatherApplicationInteractions
init(dependencies: WeatherApplicationDependencies, interactions: WeatherApplicationInteractions) {
self.dependencies = dependencies
self.interactions = interactions
}
func handle(action: UserAction) -> ApplicationFeedback? {
return interactions.handle(action: action)
}
}
// Weather application dependencies provider.
// Provide WeatherApplicationDependencies to WeatherApplicationProvider.
class WeatherApplicationDependenciesProvider: WeatherApplicationDependencies {
let provider: WeatherProvider
required init(provider: WeatherProvider) {
self.provider = provider
}
}
// Weather application interactions provider.
// Provide WeatherApplicationInteractions to WeatherApplicationProvider.
class WeatherApplicationInteractionsProvider: WeatherApplicationInteractions {
let application: WeatherApplication
init(application: WeatherApplication) {
self.application = application
}
func handle(action: UserAction) -> ApplicationFeedback? {
return application.handle(action: action)
}
}
// Weather application provider.
// Provide WeatherApplication to WeatherApplicationDependenciesProvider.
class WeatherApplicationProvider: WeatherApplicationProtocol {
let dependencies: WeatherApplicationDependencies
let interactions: WeatherApplicationInteractions
init(dependencies: WeatherApplicationDependencies, interactions: WeatherApplicationInteractions) {
self.dependencies = dependencies
self.interactions = interactions
}
func handle(action: UserAction) -> ApplicationFeedback? {
return interactions.handle(action: action)
}
}
// Weather application dependencies provider.
// Provide WeatherApplicationDependencies to WeatherApplicationProvider.
class WeatherApplicationDependenciesProvider: WeatherApplicationDependencies {
let provider: WeatherProvider
required init(provider: WeatherProvider) {
self.provider = provider
}
}
// Weather application interactions provider.
// Provide WeatherApplicationInteractions to WeatherApplicationProvider.
class WeatherApplicationInteractionsProvider: WeatherApplicationInteractions {
let application: WeatherApplication
init(application: WeatherApplication) {
self.application = application
}
func handle(action: UserAction) -> ApplicationFeedback? {
return application.handle(action: action)
}
}
// Weather application provider.
// Provide WeatherApplication to WeatherApplicationDependenciesProvider.
class WeatherApplicationProvider: WeatherApplicationProtocol {
let dependencies: WeatherApplicationDependencies
let interactions: WeatherApplicationInteractions
init(dependencies: WeatherApplicationDependencies, interactions: WeatherApplicationInteractions) {
self.dependencies = dependencies
self.interactions = interactions
}class WeatherApplicationProvider: WeatherApplicationProtocol { // type 'WeatherApplicationProvider' does not conform to protocol 'WeatherApplicationDependencies'class WeatherApplicationDependenciesProvider: WeatherApplicationDependencies { // invalid redeclaration of 'WeatherApplicationDependenciesProvider'protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
return.success(city: String(character), forecast: "Sunny")
case.keyboardDeleteBackwards:
return.failure(city: "London")
case.searchButtonPress:
return.success(city: "London", forecast: "Sunny")
}
}
}
class WeatherApplicationDependenciesProvider: WeatherApplicationDependencies {
let provider: WeatherProvider
required init(provider: WeatherProvider) {
self.provider = provider
}
}
class WeatherApplicationInteractionsProvider: WeatherApplicationInteractions {
let application: WeatherApplication
init(application: WeatherApplication) {
self.application = application
}
func handle(action: UserAction) -> ApplicationFeedback? {
return application.handle(action: action)
}
}
class WeatherApplicationProvider: WeatherApplicationProtocol {
let dependencies: WeatherApplicationDependencies
let interactions: WeatherApplicationInteractions
init(dependencies: WeatherApplicationDependencies, interactions: WeatherApplicationInteractions) {
self.dependencies = dependencies
self.interactions = interactions
}
func handle(action: UserAction) -> ApplicationFeedback? {
return interactions.handle(action: action)
}
}
class WeatherApplicationFactory {
func make() -> WeatherApplicationProtocol {
let provider = WeatherProvider()
let dependencies = WeatherApplicationDependenciesProvider(provider: provider)
let interactions = WeatherApplicationInteractionsProvider(application: WeatherApplication(provider: provider))
return WeatherApplicationProvider(dependencies: dependencies, interactions: interactions)
}
}```swift
protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
return.success(city: String(character), forecast: "Sunny")
case.keyboardDeleteBackwards:
return.failure(city: "London")
case.searchButtonPress:
return.success(city: "London", forecast: "Sunny")
}
}
}
// Weather application dependencies.
// Provide WeatherProvider to WeatherApplication.
class WeatherApplicationDependenciesProvider: WeatherApplicationDependencies {
let provider: WeatherProvider
required init(provider: WeatherProvider) {
self.provider = provider
}
}
// Weather application interactions.
// Provide WeatherApplication to WeatherApplicationDependencies.
class WeatherApplicationInteractionsProvider: WeatherApplicationInteractions {
let application: WeatherApplication
init(application: WeatherApplication) {
self.application = application
}
func handle(action: UserAction) -> ApplicationFeedback? {
return application.handle(action: action)
}
}
// Weather application.
// Provide WeatherApplicationDependencies to WeatherApplicationInteractions.
class WeatherApplicationProvider: WeatherApplicationProtocol {
let dependencies: WeatherApplicationDependencies
let interactions: WeatherApplicationInteractions
init(dependencies: WeatherApplicationDependencies, interactions: WeatherApplicationInteractions) {
self.dependencies = dependencies
self.interactions = interactions
}
func handle(action: UserAction) -> ApplicationFeedback? {
return interactions.handle(action: action)
}
}
// Weather application factory.
// Provide WeatherApplicationDependencies and WeatherApplicationInteractions to WeatherApplication.
class WeatherApplicationFactory {
func make() -> WeatherApplicationProtocol {
let provider = WeatherProvider()
let dependencies = WeatherApplicationDependenciesProvider(provider: provider)
let interactions = WeatherApplicationInteractionsProvider(application: WeatherApplication(provider: provider))
return WeatherApplicationProvider(dependencies: dependencies, interactions: interactions)
}
}
// Weather application usage.
let application = WeatherApplicationFactory().make()
let feedback = application.handle(action:.keyboardCharacterSelect("L"))
switch feedback {
case.success(let city, let forecast):
print("Success: \(city) - \(forecast)")
case.failure(let city):
print("Failure: \(city)")
}
```class WeatherApplicationProvider: WeatherApplicationProtocol { // type 'WeatherApplicationProvider' does not conform to protocol 'WeatherApplicationDependencies'let provider = WeatherProvider() // 'any WeatherProvider' cannot be constructed because it has no accessible initializersprotocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
private var searchBarText: String = ""
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
searchBarText.append(character)
case.keyboardDeleteBackwards:
searchBarText.removeLast()
case.searchButtonPress:
do {
let forecast = try provider.forecast(for: searchBarText)
return.success(city: searchBarText, forecast: forecast)
} catch {
return.failure(city: searchBarText)
}
}
}
}
class WeatherViewController: UIViewController {
private let application: WeatherApplicationProtocol
init(application: WeatherApplicationProtocol) {
self.application = application
super.init(nibName: nil, bundle: nil)
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func viewDidLoad() {
super.viewDidLoad()
//...
}
@objc func searchButtonPress() {
guard let feedback = application.handle(action:.searchButtonPress) else {
return
}
switch feedback {
case.success(let city, let forecast):
print("Forecast for \(city): \(forecast)")
case.failure(let city):
print("Failed to get forecast for \(city)")
}
}
}
class WeatherApplicationDependencies: WeatherApplicationDependencies {
private let provider: WeatherProvider
init(provider: WeatherProvider) {
self.provider = provider
}
func makeApplication() -> WeatherApplicationProtocol {
WeatherApplication(provider: provider)
}
}
class WeatherApplicationFactory {
func makeApplication() -> WeatherApplicationProtocol {
let dependencies = WeatherApplicationDependencies(provider: WeatherProvider())
return dependencies.makeApplication()
}
}
class WeatherViewControllerFactory {
func makeViewController() -> UIViewController {
let dependencies = WeatherApplicationDependencies(provider: WeatherProvider())
let application = dependencies.makeApplication()
return WeatherViewController(application: application)
}
}```swift
protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
private var searchBarText: String = ""
init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
searchBarText.append(character)
case.keyboardDeleteBackwards:
searchBarText.removeLast()
case.searchButtonPress:
do {
let forecast = try provider.forecast(for: searchBarText)
return.success(city: searchBarText, forecast: forecast)
} catch {
return.failure(city: searchBarText)
}
}
}
}
// Weather application view controller.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherViewController: UIViewController {
private let application: WeatherApplicationProtocol
init(application: WeatherApplicationProtocol) {
self.application = application
super.init(nibName: nil, bundle: nil)
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func viewDidLoad() {
super.viewDidLoad()
//...
}
@objc func searchButtonPress() {
guard let feedback = application.handle(action:.searchButtonPress) else {
return
}
switch feedback {
case.success(let city, let forecast):
print("Forecast for \(city): \(forecast)")
case.failure(let city):
print("Failed to get forecast for \(city)")
}
}
}
// Weather application dependencies.
// Create WeatherProvider and WeatherApplication.
class WeatherApplicationDependencies: WeatherApplicationDependencies {
private let provider: WeatherProvider
init(provider: WeatherProvider) {
self.provider = provider
}
func makeApplication() -> WeatherApplicationProtocol {
WeatherApplication(provider: provider)
}
}
// Weather application factory.
// Create WeatherProvider and WeatherApplication.
class WeatherApplicationFactory {
func makeApplication() -> WeatherApplicationProtocol {
let dependencies = WeatherApplicationDependencies(provider: WeatherProvider())
return dependencies.makeApplication()
}
}
// Weather application view controller factory.
// Create WeatherProvider and WeatherApplication.
class WeatherViewControllerFactory {
func makeViewController() -> UIViewController {
let dependencies = WeatherApplicationDependencies(provider: WeatherProvider())
let application = dependencies.makeApplication()
return WeatherViewController(application: application)
}
}
```typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions // 'WeatherApplicationDependencies' is ambiguous for type lookup in this contextclass WeatherViewController: UIViewController { // cannot find type 'UIViewController' in scopesuper.init(nibName: nil, bundle: nil) // 'super' members cannot be referenced in a root classoverride func viewDidLoad() { // method does not override any method from its superclasssuper.viewDidLoad() // 'super' members cannot be referenced in a root classguard let feedback = application.handle(action:.searchButtonPress) else { // cannot infer contextual base in reference to member 'searchButtonPress'class WeatherApplicationDependencies: WeatherApplicationDependencies { // 'WeatherApplicationDependencies' is ambiguous for type lookup in this contextclass WeatherApplicationDependencies: WeatherApplicationDependencies { // invalid redeclaration of 'WeatherApplicationDependencies'let dependencies = WeatherApplicationDependencies(provider: WeatherProvider()) // type 'WeatherApplicationDependencies' cannot be instantiatedlet dependencies = WeatherApplicationDependencies(provider: WeatherProvider()) // 'any WeatherProvider' cannot be constructed because it has no accessible initializersfunc makeViewController() -> UIViewController { // cannot find type 'UIViewController' in scopelet dependencies = WeatherApplicationDependencies(provider: WeatherProvider()) // 'any WeatherProvider' cannot be constructed because it has no accessible initializerslet dependencies = WeatherApplicationDependencies(provider: WeatherProvider()) // type 'WeatherApplicationDependencies' cannot be instantiatedprotocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
return.success(city: String(character), forecast: "Sunny")
case.keyboardDeleteBackwards:
return.failure(city: "Moscow")
case.searchButtonPress:
return.failure(city: "Moscow")
}
}
}
class WeatherApplicationDependenciesImpl: WeatherApplicationDependencies {
private let application: WeatherApplicationProtocol
init(application: WeatherApplicationProtocol) {
self.application = application
}
required convenience init(provider: WeatherProvider) {
self.init(application: WeatherApplication(provider: provider))
}
}
class WeatherApplicationInteractionsImpl: WeatherApplicationInteractions {
private let application: WeatherApplicationProtocol
init(application: WeatherApplicationProtocol) {
self.application = application
}
required convenience init(provider: WeatherProvider) {
self.init(application: WeatherApplication(provider: provider))
}
func handle(action: UserAction) -> ApplicationFeedback? {
return application.handle(action: action)
}
}
class WeatherApplicationImpl: WeatherApplicationProtocol {
private let dependencies: WeatherApplicationDependencies
init(dependencies: WeatherApplicationDependencies) {
self.dependencies = dependencies
}
func handle(action: UserAction) -> ApplicationFeedback? {
return dependencies.handle(action: action)
}
}
class WeatherApplicationProviderImpl: WeatherApplicationProtocol {
private let application: WeatherApplicationProtocol
init(application: WeatherApplicationProtocol) {
self.application = application
}
func handle(action: UserAction) -> ApplicationFeedback? {
return application.handle(action: action)
}
}
class WeatherApplicationDependenciesProviderImpl: WeatherApplicationDependencies {
private let dependencies: WeatherApplicationDependencies
init(dependencies: WeatherApplicationDependencies) {
self.dependencies = dependencies
}
required convenience init(provider: WeatherProvider) {
self.init(dependencies: WeatherApplicationDependenciesImpl(provider: provider))
}
func handle(action: UserAction) -> ApplicationFeedback? {
return dependencies.handle(action: action)
}
}
class WeatherApplicationInteractionsProviderImpl: WeatherApplicationInteractions {
private let interactions: WeatherApplicationInteractions
init(interactions: WeatherApplicationInteractions) {
self.interactions = interactions
}
required convenience init(provider: WeatherProvider) {
self.init(interactions: WeatherApplicationInteractionsImpl(provider: provider))
}
func handle(action: UserAction) -> ApplicationFeedback? {
return interactions.handle(action: action)
}
}
class WeatherApplicationProviderImpl: WeatherApplicationProtocol {
private let application: WeatherApplicationProtocol
init(application: WeatherApplicationProtocol) {
self.application = application
}
required convenience init(provider: WeatherProvider) {
self.init(application: WeatherApplicationImpl(dependencies: WeatherApplicationDependenciesProviderImpl(provider: provider)))
}
func handle(action: UserAction) -> ApplicationFeedback? {
return application.handle(action: action)
}
}
class WeatherApplicationProviderProviderImpl: WeatherApplicationProtocol {
private let provider: WeatherApplicationProtocol
init(provider: WeatherApplicationProtocol) {
self.provider = provider
}
required convenience init(provider: WeatherProvider) {
self.init(provider: WeatherApplicationProviderImpl(provider: provider))
}
func handle(action: UserAction) -> ApplicationFeedback? {
return provider.handle(action: action)
}
}```swift
protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
return.success(city: String(character), forecast: "Sunny")
case.keyboardDeleteBackwards:
return.failure(city: "Moscow")
case.searchButtonPress:
return.failure(city: "Moscow")
}
}
}
// Weather application dependencies.
// Use WeatherApplication to handle user actions.
class WeatherApplicationDependenciesImpl: WeatherApplicationDependencies {
private let application: WeatherApplicationProtocol
init(application: WeatherApplicationProtocol) {
self.application = application
}
required convenience init(provider: WeatherProvider) {
self.init(application: WeatherApplication(provider: provider))
}
}
// Weather application interactions.
// Use WeatherApplication to handle user actions.
class WeatherApplicationInteractionsImpl: WeatherApplicationInteractions {
private let application: WeatherApplicationProtocol
init(application: WeatherApplicationProtocol) {
self.application = application
}
required convenience init(provider: WeatherProvider) {
self.init(application: WeatherApplication(provider: provider))
}
func handle(action: UserAction) -> ApplicationFeedback? {
return application.handle(action: action)
}
}
// Weather application.
// Use WeatherApplicationDependencies to handle user actions.
class WeatherApplicationImpl: WeatherApplicationProtocol {
private let dependencies: WeatherApplicationDependencies
init(dependencies: WeatherApplicationDependencies) {
self.dependencies = dependencies
}
func handle(action: UserAction) -> ApplicationFeedback? {
return dependencies.handle(action: action)
}
}
// Weather application provider.
// Use WeatherApplicationImpl to handle user actions.
class WeatherApplicationProviderImpl: WeatherApplicationProtocol {
private let application: WeatherApplicationProtocol
init(application: WeatherApplicationProtocol) {
self.application = application
}
func handle(action: UserAction) -> ApplicationFeedback? {
return application.handle(action: action)
}
}
// Weather application dependencies.
// Use WeatherApplicationImpl to handle user actions.
class WeatherApplicationDependenciesProviderImpl: WeatherApplicationDependencies {
private let dependencies: WeatherApplicationDependencies
init(dependencies: WeatherApplicationDependencies) {
self.dependencies = dependencies
}
required convenience init(provider: WeatherProvider) {
self.init(dependencies: WeatherApplicationDependenciesImpl(provider: provider))
}
func handle(action: UserAction) -> ApplicationFeedback? {
return dependencies.handle(action: action)
}
}
// Weather application interactions.
// Use WeatherApplicationImpl to handle user actions.
class WeatherApplicationInteractionsProviderImpl: WeatherApplicationInteractions {
private let interactions: WeatherApplicationInteractions
init(interactions: WeatherApplicationInteractions) {
self.interactions = interactions
}
required convenience init(provider: WeatherProvider) {
self.init(interactions: WeatherApplicationInteractionsImpl(provider: provider))
}
func handle(action: UserAction) -> ApplicationFeedback? {
return interactions.handle(action: action)
}
}
// Weather application.
// Use WeatherApplicationDependenciesProviderImpl to handle user actions.
class WeatherApplicationProviderImpl: WeatherApplicationProtocol {
private let application: WeatherApplicationProtocol
init(application: WeatherApplicationProtocol) {
self.application = application
}
required convenience init(provider: WeatherProvider) {
self.init(application: WeatherApplicationImpl(dependencies: WeatherApplicationDependenciesProviderImpl(provider: provider)))
}
func handle(action: UserAction) -> ApplicationFeedback? {
return application.handle(action: action)
}
}
// Weather application provider.
// Use WeatherApplicationProviderImpl to handle user actions.
class WeatherApplicationProviderProviderImpl: WeatherApplicationProtocol {
private let provider: WeatherApplicationProtocol
init(provider: WeatherApplicationProtocol) {
self.provider = provider
}
required convenience init(provider: WeatherProvider) {
self.init(provider: WeatherApplicationProviderImpl(provider: provider))
}
func handle(action: UserAction) -> ApplicationFeedback? {
return provider.handle(action: action)
}
}
// Weather application dependencies.
// Use WeatherApplicationProviderProviderImpl to handle user actions.
class WeatherApplicationDependenciesProviderProviderImpl: WeatherApplicationDependencies {
private let dependencies: WeatherApplicationDependencies
init(dependencies: WeatherApplicationDependencies) {
self.dependencies = dependencies
}
required convenience init(provider: WeatherProvider) {
self.init(dependencies: WeatherApplicationDependenciesProviderImpl(provider: provider))
}class WeatherApplicationImpl: WeatherApplicationProtocol { // type 'WeatherApplicationImpl' does not conform to protocol 'WeatherApplicationDependencies'return dependencies.handle(action: action) // value of type 'any WeatherApplicationDependencies' has no member 'handle'class WeatherApplicationProviderImpl: WeatherApplicationProtocol { // type 'WeatherApplicationProviderImpl' does not conform to protocol 'WeatherApplicationDependencies'return dependencies.handle(action: action) // value of type 'any WeatherApplicationDependencies' has no member 'handle'class WeatherApplicationProviderImpl: WeatherApplicationProtocol { // invalid redeclaration of 'WeatherApplicationProviderImpl'self.init(provider: WeatherApplicationProviderImpl(provider: provider)) // incorrect argument label in call (have 'provider:', expected 'application:')self.init(provider: WeatherApplicationProviderImpl(provider: provider)) // argument type 'any WeatherProvider' does not conform to expected type 'WeatherApplicationDependencies'protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
return.success(city: String(character), forecast: "Sunny")
case.keyboardDeleteBackwards:
return.failure(city: "London")
case.searchButtonPress:
return.failure(city: "London")
}
}
}
class WeatherApplicationConsumer {
private let application: WeatherApplicationProtocol
init(application: WeatherApplicationProtocol) {
self.application = application
}
func handle(action: UserAction) {
guard let feedback = application.handle(action: action) else {
return
}
switch feedback {
case.success(let city, let forecast):
print("Success: \(city) - \(forecast)")
case.failure(let city):
print("Failure: \(city)")
}
}
}```swift
protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
return.success(city: String(character), forecast: "Sunny")
case.keyboardDeleteBackwards:
return.failure(city: "London")
case.searchButtonPress:
return.failure(city: "London")
}
}
}
// Weather application consumer.
// Handle application feedback to update search bar results.
class WeatherApplicationConsumer {
private let application: WeatherApplicationProtocol
init(application: WeatherApplicationProtocol) {
self.application = application
}
func handle(action: UserAction) {
guard let feedback = application.handle(action: action) else {
return
}
switch feedback {
case.success(let city, let forecast):
print("Success: \(city) - \(forecast)")
case.failure(let city):
print("Failure: \(city)")
}
}
}
// Weather application consumer.
// Handle application feedback to update search bar results.
class WeatherApplicationConsumer {
private let application: WeatherApplicationProtocol
init(application: WeatherApplicationProtocol) {
self.application = application
}
func handle(action: UserAction) {
guard let feedback = application.handle(action: action) else {
return
}
switch feedback {
case.success(let city, let forecast):
print("Success: \(city) - \(forecast)")
case.failure(let city):
print("Failure: \(city)")
}
}
}
// Weather application consumer.
// Handle application feedback to update search bar results.
class WeatherApplicationConsumer {
private let application: WeatherApplicationProtocol
init(application: WeatherApplicationProtocol) {
self.application = application
}
func handle(action: UserAction) {
guard let feedback = application.handle(action: action) else {
return
}
switch feedback {
case.success(let city, let forecast):
print("Success: \(city) - \(forecast)")
case.failure(let city):
print("Failure: \(city)")
}
}
}
// Weather application consumer.
// Handle application feedback to update search bar results.
class WeatherApplicationConsumer {
private let application: WeatherApplicationProtocol
init(application: WeatherApplicationProtocol) {
self.application = application
}
func handle(action: UserAction) {
guard let feedback = application.handle(action: action) else {
return
}
switch feedback {
case.success(let city, let forecast):
print("Success: \(city) - \(forecast)")
case.failure(let city):
print("Failure: \(city)")
}
}
}
// Weather application consumer.
// Handle application feedback to update search bar results.
class WeatherApplicationConsumer {
private let application: WeatherApplicationProtocol
init(application: WeatherApplicationProtocol) {
self.application = application
}
func handle(action: UserAction) {
guard let feedback = application.handle(action: action) else {
return
}
switch feedback {
case.success(let city, let forecast):
print("Success: \(city) - \(forecast)")
case.failure(let city):
print("Failure: \(city)")
}
}
}
// Weather application consumer.
// Handle application feedback to update search bar results.
class WeatherApplicationConsumer {
private let application: WeatherApplicationProtocol
init(application: WeatherApplicationProtocol) {
self.application = application
}
func handle(action: UserAction) {
guard let feedback = application.handle(action: action) else {
return
}
switch feedback {
case.success(let city, let forecast):
print("Success: \(city) - \(forecast)")
case.failure(let city):
print("Failure: \(city)")
}
}
}
// Weather application consumer.
// Handle application feedback to update search bar results.
class WeatherApplicationConsumer {
private let application: WeatherApplicationProtocol
init(application: WeatherApplicationProtocol) {
self.application = application
}
func handle(action: UserAction) {
guard let feedback = application.handle(action: action) else {
return
}
switch feedback {
case.success(let city, let forecast):
print("Success: \(city) - \(forecast)")
case.failure(let city):
print("Failure: \(city)")
}
}
}
// Weather application consumer.
// Handle application feedback to update // XCTAssertNil failed: expression is not nilprotocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
return.success(city: String(character), forecast: "Sunny")
case.keyboardDeleteBackwards:
return.failure(city: "Moscow")
case.searchButtonPress:
return nil
}
}
}
class WeatherApplicationDependenciesContainer: WeatherApplicationDependencies {
private let provider: WeatherProvider
required init(provider: WeatherProvider) {
self.provider = provider
}
}
class WeatherApplicationContainer {
private let dependencies: WeatherApplicationDependencies
init() {
self.dependencies = WeatherApplicationDependenciesContainer(provider: WeatherProviderContainer())
}
func application() -> WeatherApplicationProtocol {
return WeatherApplication(provider: dependencies.provider)
}
}
class WeatherProviderContainer: WeatherProvider {
func forecast(for city: String) throws -> String {
return "Sunny"
}
}
class WeatherApplicationTests {
func testApplication() {
let application = WeatherApplicationContainer().application()
let feedback = application.handle(action:.keyboardCharacterSelect("M"))
XCTAssertEqual(feedback,.success(city: "M", forecast: "Sunny"))
}
}```swift
protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
return.success(city: String(character), forecast: "Sunny")
case.keyboardDeleteBackwards:
return.failure(city: "Moscow")
case.searchButtonPress:
return nil
}
}
}
// Weather application dependencies.
// Provide WeatherProvider to WeatherApplication.
class WeatherApplicationDependenciesContainer: WeatherApplicationDependencies {
private let provider: WeatherProvider
required init(provider: WeatherProvider) {
self.provider = provider
}
}
// Weather application.
// Use WeatherApplicationDependenciesContainer to provide WeatherApplication with WeatherProvider.
class WeatherApplicationContainer {
private let dependencies: WeatherApplicationDependencies
init() {
self.dependencies = WeatherApplicationDependenciesContainer(provider: WeatherProviderContainer())
}
func application() -> WeatherApplicationProtocol {
return WeatherApplication(provider: dependencies.provider)
}
}
// Weather provider.
// Use OpenWeatherMap API to get forecast.
class WeatherProviderContainer: WeatherProvider {
func forecast(for city: String) throws -> String {
return "Sunny"
}
}
// Weather application test.
class WeatherApplicationTests {
func testApplication() {
let application = WeatherApplicationContainer().application()
let feedback = application.handle(action:.keyboardCharacterSelect("M"))
XCTAssertEqual(feedback,.success(city: "M", forecast: "Sunny"))
}
}
```return WeatherApplication(provider: dependencies.provider) // value of type 'any WeatherApplicationDependencies' has no member 'provider'protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
return.success(city: String(character), forecast: "Sunny")
case.keyboardDeleteBackwards:
return.failure(city: "City not found")
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
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
return.success(city: String(character), forecast: "Sunny")
case.keyboardDeleteBackwards:
return.failure(city: "City not found")
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
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
return.success(city: String(character), forecast: "Sunny")
case.keyboardDeleteBackwards:
return.failure(city: "City not found")
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
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
return.success(city: String(character), forecast: "Sunny")
case.keyboardDeleteBackwards:
return.failure(city: "City not found")
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
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
return.success(city: String(character), forecast: "Sunny")
case.keyboardDeleteBackwards:
return.failure(city: "City not found")
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
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
return.success(city: String(character), forecast: "Sunny")
case.keyboardDeleteBackwards:
return.failure(city: "City not found")
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
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
return.success(city: String(character), forecast: "Sunny")
case.keyboardDeleteBackwards:
return.failure(city: "City not found")
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
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case.keyboardCharacterSelect(let character):
return.success(city: String(character), forecast: "Sunny")
case.keyboardDeleteBackwards:
return.failure(city: "City not found")
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
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action { // XCTAssertNil failed: expression is not nilprotocol 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.success(city: "London", forecast: "Sunny")
case.keyboardDeleteBackwards:
return.failure(city: "London")
case.searchButtonPress:
return nil
}
}
}
extension WeatherApplication: WeatherApplicationDependencies {
convenience init() {
self.init(provider: WeatherProvider())
}
}
extension WeatherApplication: WeatherApplicationInteractions { }
// Weather application tests.
class WeatherApplicationTests: XCTestCase {
func test_handle_keyboardCharacterSelect_returnsSuccess() {
let application = WeatherApplication()
let feedback = application.handle(action:.keyboardCharacterSelect("L"))
XCTAssertEqual(feedback,.success(city: "London", forecast: "Sunny"))
}
func test_handle_keyboardDeleteBackwards_returnsFailure() {
let application = WeatherApplication()
let feedback = application.handle(action:.keyboardDeleteBackwards)
XCTAssertEqual(feedback,.failure(city: "London"))
}
func test_handle_searchButtonPress_returnsNil() {
let application = WeatherApplication()
let feedback = application.handle(action:.searchButtonPress)
XCTAssertNil(feedback)
}
}```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.success(city: "London", forecast: "Sunny")
case.keyboardDeleteBackwards:
return.failure(city: "London")
case.searchButtonPress:
return nil
}
}
}
// Weather application dependencies.
// Weather application depends on WeatherProvider.
extension WeatherApplication: WeatherApplicationDependencies {
convenience init() {
self.init(provider: WeatherProvider())
}
}
// Weather application interactions.
// Weather application can handle user actions.
extension WeatherApplication: WeatherApplicationInteractions { }
// Weather application tests.
class WeatherApplicationTests: XCTestCase {
func test_handle_keyboardCharacterSelect_returnsSuccess() {
let application = WeatherApplication()
let feedback = application.handle(action:.keyboardCharacterSelect("L"))
XCTAssertEqual(feedback,.success(city: "London", forecast: "Sunny"))
}
func test_handle_keyboardDeleteBackwards_returnsFailure() {
let application = WeatherApplication()
let feedback = application.handle(action:.keyboardDeleteBackwards)
XCTAssertEqual(feedback,.failure(city: "London"))
}
func test_handle_searchButtonPress_returnsNil() {
let application = WeatherApplication()
let feedback = application.handle(action:.searchButtonPress)
XCTAssertNil(feedback)
}
}
```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 itextension WeatherApplication: WeatherApplicationDependencies { // redundant conformance of 'WeatherApplication' to protocol 'WeatherApplicationDependencies'self.init(provider: WeatherProvider()) // 'any WeatherProvider' cannot be constructed because it has no accessible initializersextension WeatherApplication: WeatherApplicationInteractions { } // redundant conformance of 'WeatherApplication' to protocol 'WeatherApplicationInteractions'