Metadata
| Key | Value |
|---|---|
| engine | modal |
| prompt | completion |
| temp | 0.2 |
| top_p | 0.95 |
| max_new_tokens | 1024 |
| n_completions | 10 |
Solutions
typealias JSON = [String: Any]
enum ParsingError: Error {
case invalidInput
case internalError(Error)
}
func parse(string: String) throws -> JSON {
guard let data = string.data(using: .utf8) else {
throw ParsingError.invalidInput
}
do {
let json = try JSONSerialization.jsonObject(with: data, options: []) as? JSON
guard let json = json else {
throw ParsingError.invalidInput
}
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
guard let json = json else {
throw ParsingError.invalidInput
}
return json
} catch {
throw ParsingError.internalError(error)
}
}
// Example usage:
let jsonString = "{\"name\": \"John\", \"age\": 30}"
do {
let json = try parse(string: jsonString)
print(json)
} catch ParsingError.invalidInput {
print("Invalid input provided.")
} catch ParsingError.internalError(let error) {
print("Internal error: \(error)")
} catch {
print("Unexpected error: \(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
guard let json = json else {
throw ParsingError.invalidInput
}
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
guard let json = json else {
throw ParsingError.invalidInput
}
return json
} catch {
throw ParsingError.internalError(error)
}
}
// Example usage:
let jsonString = """
{
"name": "John Doe",
"age": 30,
"is_employee": true
}
"""
do {
let parsedJSON = try parse(string: jsonString)
print(parsedJSON)
} catch ParsingError.invalidInput {
print("Invalid input provided.")
} catch ParsingError.internalError(let error) {
print("Internal error occurred: \(error.localizedDescription)")
} catch {
print("An unexpected error occurred: \(error.localizedDescription)")
}
```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
guard let json = json else {
throw ParsingError.invalidInput
}
return json
} catch {
throw ParsingError.internalError(error)
}
}
func isNumber(_ value: Any) -> Bool {
switch value {
case is Int, is Double:
return true
default:
return false
}
}
func isString(_ value: Any) -> Bool {
return value is String
}
func isBoolean(_ value: Any) -> Bool {
return value is Bool
}
func isNull(_ value: Any) -> Bool {
return value is NSNull
}
func isArray(_ value: Any) -> Bool {
return value is [Any]
}
func isObject(_ value: Any) -> Bool {
return value is [String: Any]
}
func isValidJSONValue(_ value: Any) -> Bool {
return isNumber(value) || isString(value) || isBoolean(value) || isNull(value) || isArray(value) || isObject(value)
}
func main() {
let jsonString = "{\"name\": \"John\", \"age\": 30, \"is_student\": false, \"grades\": [85, 90, 92], \"address\": {\"street\": \"123 Main St\", \"city\": \"Anytown\"}}"
do {
let jsonData = try parse(string: jsonString)
print(jsonData)
} catch ParsingError.invalidInput {
print("Invalid input: The provided string is not a valid JSON.")
} catch ParsingError.internalError(let error) {
print("Internal error: \(error.localizedDescription)")
} catch {
print("An unexpected error occurred: \(error.localizedDescription)")
}
}```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
guard let json = json else {
throw ParsingError.invalidInput
}
return json
} catch {
throw ParsingError.internalError(error)
}
}
// Function to check if a value is a number (Int or Double)
func isNumber(_ value: Any) -> Bool {
switch value {
case is Int, is Double:
return true
default:
return false
}
}
// Function to check if a value is a string
func isString(_ value: Any) -> Bool {
return value is String
}
// Function to check if a value is a boolean
func isBoolean(_ value: Any) -> Bool {
return value is Bool
}
// Function to check if a value is a null
func isNull(_ value: Any) -> Bool {
return value is NSNull
}
// Function to check if a value is an array
func isArray(_ value: Any) -> Bool {
return value is [Any]
}
// Function to check if a value is an object
func isObject(_ value: Any) -> Bool {
return value is [String: Any]
}
// Function to check if a value is a valid JSON value
func isValidJSONValue(_ value: Any) -> Bool {
return isNumber(value) || isString(value) || isBoolean(value) || isNull(value) || isArray(value) || isObject(value)
}
// Main function to test the generated functions
func main() {
let jsonString = "{\"name\": \"John\", \"age\": 30, \"is_student\": false, \"grades\": [85, 90, 92], \"address\": {\"street\": \"123 Main St\", \"city\": \"Anytown\"}}"
do {
let jsonData = try parse(string: jsonString)
print(jsonData)
} catch ParsingError.invalidInput {
print("Invalid input: The provided string is not a valid JSON.")
} catch ParsingError.internalError(let error) {
print("Internal error: \(error.localizedDescription)")
} catch {
print("An unexpected error occurred: \(error.localizedDescription)")
}
}
main()
```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
guard let json = json else {
throw ParsingError.invalidInput
}
return json
} catch {
throw ParsingError.internalError(error)
}
}
func hasNonEmptyValue(forKey key: String, inJSON json: JSON) -> Bool {
guard let value = json[key] else {
return false
}
switch value {
case is String:
return !(value as! String).isEmpty
case is Int, is Double:
return true
case is Bool:
return value as! Bool
case is [String: Any]:
return !(value as! [String: Any]).isEmpty
case is [Any]:
return !(value as! [Any]).isEmpty
default:
return false
}
}
func main() {
let jsonString = """
{
"name": "John Doe",
"age": 30,
"address": {
"street": "123 Main St",
"city": "Anytown"
},
"hobbies": ["reading", "cycling", "hiking"],
"is_employed": true
}
"""
do {
let json = try parse(string: jsonString)
let keyToCheck = "name"
let hasNonEmptyValue = hasNonEmptyValue(forKey: keyToCheck, inJSON: json)
print("Does the JSON object contain a non-empty value for the key '\(keyToCheck)'? \(hasNonEmptyValue)")
} catch {
print("Error: \(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
guard let json = json else {
throw ParsingError.invalidInput
}
return json
} catch {
throw ParsingError.internalError(error)
}
}
// Function to check if a JSON object contains a key with a non-empty value.
func hasNonEmptyValue(forKey key: String, inJSON json: JSON) -> Bool {
guard let value = json[key] else {
return false
}
switch value {
case is String:
return !(value as! String).isEmpty
case is Int, is Double:
return true
case is Bool:
return value as! Bool
case is [String: Any]:
return !(value as! [String: Any]).isEmpty
case is [Any]:
return !(value as! [Any]).isEmpty
default:
return false
}
}
// Main function to test the generated function.
func main() {
let jsonString = """
{
"name": "John Doe",
"age": 30,
"address": {
"street": "123 Main St",
"city": "Anytown"
},
"hobbies": ["reading", "cycling", "hiking"],
"is_employed": true
}
"""
do {
let json = try parse(string: jsonString)
let keyToCheck = "name"
let hasNonEmptyValue = hasNonEmptyValue(forKey: keyToCheck, inJSON: json)
print("Does the JSON object contain a non-empty value for the key '\(keyToCheck)'? \(hasNonEmptyValue)")
} catch {
print("Error: \(error)")
}
}
// Run the main function to perform the test.
main()
```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
guard let json = json else {
throw ParsingError.invalidInput
}
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
guard let json = json else {
throw ParsingError.invalidInput
}
return json
} catch {
throw ParsingError.internalError(error)
}
}
// Example usage:
let jsonString = "{\"name\": \"John\", \"age\": 30}"
do {
let json = try parse(string: jsonString)
print(json)
} catch ParsingError.invalidInput {
print("Invalid input provided.")
} catch ParsingError.internalError(let error) {
print("Internal error: \(error)")
} catch {
print("Unexpected error: \(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
guard let json = json else {
throw ParsingError.invalidInput
}
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
guard let json = json else {
throw ParsingError.invalidInput
}
return json
} catch {
throw ParsingError.internalError(error)
}
}
// Example usage:
let jsonString = "{\"name\": \"John\", \"age\": 30, \"city\": \"New York\"}"
do {
let json = try parse(string: jsonString)
print(json)
} catch ParsingError.invalidInput {
print("Invalid input provided.")
} catch ParsingError.internalError(let error) {
print("Internal error occurred: \(error.localizedDescription)")
} catch {
print("An unexpected error occurred: \(error.localizedDescription)")
}
```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
guard let json = json else {
throw ParsingError.invalidInput
}
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
guard let json = json else {
throw ParsingError.invalidInput
}
return json
} catch {
throw ParsingError.internalError(error)
}
}
// Example usage:
let jsonString = "{\"name\": \"John\", \"age\": 30}"
do {
let parsedJSON = try parse(string: jsonString)
print(parsedJSON)
} catch ParsingError.invalidInput {
print("Invalid input provided.")
} catch ParsingError.internalError(let error) {
print("Internal error occurred: \(error)")
} catch {
print("An unexpected error occurred: \(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
guard let json = json else {
throw ParsingError.invalidInput
}
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
guard let json = json else {
throw ParsingError.invalidInput
}
return json
} catch {
throw ParsingError.internalError(error)
}
}
// Example usage:
let jsonString = """
{
"name": "John Doe",
"age": 30,
"is_employee": true
}
"""
do {
let jsonData = try parse(string: jsonString)
print(jsonData)
} catch ParsingError.invalidInput {
print("Invalid input provided.")
} catch ParsingError.internalError(let error) {
print("Internal error occurred: \(error.localizedDescription)")
} catch {
print("Unexpected error occurred: \(error.localizedDescription)")
}
```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
guard let json = json else {
throw ParsingError.invalidInput
}
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
guard let json = json else {
throw ParsingError.invalidInput
}
return json
} catch {
throw ParsingError.internalError(error)
}
}
// Example usage:
let jsonString = """
{
"name": "John Doe",
"age": 30,
"is_employee": true
}
"""
do {
let json = try parse(string: jsonString)
print(json)
} catch ParsingError.invalidInput {
print("Invalid input provided.")
} catch ParsingError.internalError(let error) {
print("Internal error: \(error.localizedDescription)")
} catch {
print("An unexpected error occurred: \(error.localizedDescription)")
}
```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
guard let json = json else {
throw ParsingError.invalidInput
}
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
guard let json = json else {
throw ParsingError.invalidInput
}
return json
} catch {
throw ParsingError.internalError(error)
}
}
// Example usage:
let jsonString = "{\"name\": \"John\", \"age\": 30}"
do {
let json = try parse(string: jsonString)
print(json)
} catch ParsingError.invalidInput {
print("Invalid input provided.")
} catch ParsingError.internalError(let error) {
print("Internal error: \(error)")
} catch {
print("Unexpected error: \(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 attributeString = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childString = children.map { generate($0) }.joined(separator: "")
return "<" + name + (attributeString.isEmpty ? "" : " " + attributeString) + ">" + childString + "</" + 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 attributeString = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childString = children.map { generate($0) }.joined(separator: "")
return "<" + name + (attributeString.isEmpty ? "" : " " + attributeString) + ">" + childString + "</" + name + ">"
}
}
// Example usage:
let tree = HTMLNode.element("div", children: [
HTMLNode.element("a", attributes: ["href": "swifteval"])
])
print(generate(tree)) // Output: "<div><a href="swifteval"></a></div>"
```indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
var result = "<" + name
for (key, value) in attributes {
result += " \(key)=\"\(value)\""
}
result += ">"
for child in children {
result += generate(child)
}
result += "</\(name)>"
return result
}
}```swift
indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
var result = "<" + name
for (key, value) in attributes {
result += " \(key)=\"\(value)\""
}
result += ">"
for child in children {
result += generate(child)
}
result += "</\(name)>"
return result
}
}
// Example of usage
let tree = HTMLNode.element("div", children: [
HTMLNode.element("a", attributes: ["href": "swifteval"])
])
print(generate(tree))
// Output: "<div><a href="swifteval"></a></div>"
```indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<" + name + (attributesString.isEmpty ? "" : " " + attributesString) + ">" + childrenString + "</" + name + ">"
}
}```swift
indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
// HTML generator from predefined elements tree.
// Output with standart HTML like this "<div><a href="swifteval"></a></div>"
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
let attributesString = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<" + name + (attributesString.isEmpty ? "" : " " + attributesString) + ">" + childrenString + "</" + name + ">"
}
}
// Example of usage:
let tree = HTMLNode.element("div", children: [
HTMLNode.element("a", attributes: ["href": "swifteval"])
])
print(generate(tree)) // Output: "<div><a href="swifteval"></a></div>"
```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.isEmpty ? "" : " " + 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.isEmpty ? "" : " " + attributesString) + ">" + childrenString + "</" + name + ">"
}
}
// Example usage:
let htmlTree = HTMLNode.element("div", children: [
HTMLNode.element("a", attributes: ["href": "swifteval"])
])
print(generate(htmlTree)) // Output: <div><a href="swifteval"></a></div>
```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 attrs = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childNodes = children.map { generate($0) }.joined(separator: "")
return "<" + name + (attrs.isEmpty ? "" : " ") + attrs + ">" + childNodes + "</" + 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 attrs = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childNodes = children.map { generate($0) }.joined(separator: "")
return "<" + name + (attrs.isEmpty ? "" : " ") + attrs + ">" + childNodes + "</" + name + ">"
}
}
// Example of usage
let tree = HTMLNode.element("div", children: [
HTMLNode.element("a", attributes: ["href": "swifteval"])
])
print(generate(tree)) // Output: "<div><a href="swifteval"></a></div>"
```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 attrs = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childs = children.map { generate($0) }.joined(separator: "")
return "<" + name + (attrs.isEmpty ? "" : " ") + attrs + ">" + childs + "</" + 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 attrs = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childs = children.map { generate($0) }.joined(separator: "")
return "<" + name + (attrs.isEmpty ? "" : " ") + attrs + ">" + childs + "</" + name + ">"
}
}
// Example of usage
let tree = HTMLNode.element("div", children: [
HTMLNode.element("a", attributes: ["href": "swifteval"])
])
print(generate(tree)) // <div><a href="swifteval"></a></div>
```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 attributeString = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<" + name + (attributeString.isEmpty ? "" : " " + attributeString) + ">" + 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 attributeString = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<" + name + (attributeString.isEmpty ? "" : " " + attributeString) + ">" + childrenString + "</" + name + ">"
}
}
// Example usage:
let tree = HTMLNode.element("div", children: [
HTMLNode.element("a", attributes: ["href": "swifteval"])
])
print(generate(tree)) // Output: "<div><a href="swifteval"></a></div>"
```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 attrs = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childContent = children.map { generate($0) }.joined(separator: "")
return "<" + name + (attrs.isEmpty ? "" : " " + attrs) + ">" + childContent + "</" + 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 attrs = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childContent = children.map { generate($0) }.joined(separator: "")
return "<" + name + (attrs.isEmpty ? "" : " " + attrs) + ">" + childContent + "</" + name + ">"
}
}
// Example of usage
let tree = HTMLNode.element("div", children: [
HTMLNode.element("a", attributes: ["href": "swifteval"])
])
print(generate(tree))
```indirect enum HTMLNode {
case text(_ content: String)
case element(_ name: String, attributes: [String : String] = [:], children: [Self] = [])
}
func generate(_ tree: HTMLNode) -> String {
switch tree {
case .text(let content):
return content
case .element(let name, let attributes, let children):
let attributeString = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<" + name + (attributeString.isEmpty ? "" : " " + attributeString) + ">" + 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 attributeString = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childrenString = children.map { generate($0) }.joined(separator: "")
return "<" + name + (attributeString.isEmpty ? "" : " " + attributeString) + ">" + childrenString + "</" + name + ">"
}
}
// Example usage:
let tree = HTMLNode.element("div", children: [
HTMLNode.element("a", attributes: ["href": "swifteval"])
])
print(generate(tree)) // Output: "<div><a href="swifteval"></a></div>"
```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 attrs = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childContent = children.map(generate).joined(separator: "")
return "<" + name + (attrs.isEmpty ? "" : " " + attrs) + ">" + childContent + "</" + 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 attrs = attributes.map { "\($0)=\"\($1)\"" }.joined(separator: " ")
let childContent = children.map(generate).joined(separator: "")
return "<" + name + (attrs.isEmpty ? "" : " " + attrs) + ">" + childContent + "</" + name + ">"
}
}
// Example of usage
let tree = HTMLNode.element("div", children: [
HTMLNode.element("a", attributes: ["href": "swifteval"])
])
print(generate(tree))
```enum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
let tokens = string.components(separatedBy: CharacterSet.decimalDigits.inverted).filter { !$0.isEmpty }
var stack: [Double] = []
var currentNumber: Double = 0
var currentOperator: Character? = nil
for token in tokens {
if let number = Double(token) {
currentNumber = number
} else if let operatorSymbol = token.first, ["+", "-", "*", "/"].contains(operatorSymbol) {
if let lastOperator = currentOperator {
if lastOperator == "+" {
stack.append(stack.removeLast() + currentNumber)
} else if lastOperator == "-" {
stack.append(stack.removeLast() - currentNumber)
} else if lastOperator == "*" {
stack.append(stack.removeLast() * currentNumber)
} else if lastOperator == "/" {
stack.append(stack.removeLast() / currentNumber)
}
} else {
stack.append(currentNumber)
}
currentNumber = 0
currentOperator = operatorSymbol
} else if token == "(" {
stack.append(currentNumber)
stack.append(currentOperator ?? "")
currentNumber = 0
currentOperator = nil
} else if token == ")" {
if let lastOperator = currentOperator {
if lastOperator == "+" {
stack.append(stack.removeLast() + currentNumber)
} else if lastOperator == "-" {
stack.append(stack.removeLast() - currentNumber)
} else if lastOperator == "*" {
stack.append(stack.removeLast() * currentNumber)
} else if lastOperator == "/" {
stack.append(stack.removeLast() / currentNumber)
}
} else {
stack.append(currentNumber)
}
currentNumber = stack.removeLast()
currentOperator = stack.removeLast() as? Character
} else {
throw CalculateError.invalidInput
}
}
if let lastOperator = currentOperator {
if lastOperator == "+" {
stack.append(stack.removeLast() + currentNumber)
} else if lastOperator == "-" {
stack.append(stack.removeLast() - currentNumber)
} else if lastOperator == "*" {
stack.append(stack.removeLast() * currentNumber)
} else if lastOperator == "/" {
stack.append(stack.removeLast() / currentNumber)
}
} else {
stack.append(currentNumber)
}
return stack.last ?? 0
}```swift
enum CalculateError: Error {
case invalidInput
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
let tokens = string.components(separatedBy: CharacterSet.decimalDigits.inverted).filter { !$0.isEmpty }
var stack: [Double] = []
var currentNumber: Double = 0
var currentOperator: Character? = nil
for token in tokens {
if let number = Double(token) {
currentNumber = number
} else if let operatorSymbol = token.first, ["+", "-", "*", "/"].contains(operatorSymbol) {
if let lastOperator = currentOperator {
if lastOperator == "+" {
stack.append(stack.removeLast() + currentNumber)
} else if lastOperator == "-" {
stack.append(stack.removeLast() - currentNumber)
} else if lastOperator == "*" {
stack.append(stack.removeLast() * currentNumber)
} else if lastOperator == "/" {
stack.append(stack.removeLast() / currentNumber)
}
} else {
stack.append(currentNumber)
}
currentNumber = 0
currentOperator = operatorSymbol
} else if token == "(" {
stack.append(currentNumber)
stack.append(currentOperator ?? "")
currentNumber = 0
currentOperator = nil
} else if token == ")" {
if let lastOperator = currentOperator {
if lastOperator == "+" {
stack.append(stack.removeLast() + currentNumber)
} else if lastOperator == "-" {
stack.append(stack.removeLast() - currentNumber)
} else if lastOperator == "*" {
stack.append(stack.removeLast() * currentNumber)
} else if lastOperator == "/" {
stack.append(stack.removeLast() / currentNumber)
}
} else {
stack.append(currentNumber)
}
currentNumber = stack.removeLast()
currentOperator = stack.removeLast() as? Character
} else {
throw CalculateError.invalidInput
}
}
if let lastOperator = currentOperator {
if lastOperator == "+" {
stack.append(stack.removeLast() + currentNumber)
} else if lastOperator == "-" {
stack.append(stack.removeLast() - currentNumber)
} else if lastOperator == "*" {
stack.append(stack.removeLast() * currentNumber)
} else if lastOperator == "/" {
stack.append(stack.removeLast() / currentNumber)
}
} else {
stack.append(currentNumber)
}
return stack.last ?? 0
}
// Example usage:
do {
let result = try calculate("2+2*2")
print(result) // Output: 6.0
} catch {
print(error)
}
```stack.append(currentOperator ?? "") // no exact matches in call to instance method 'append'stack.append(currentOperator ?? "") // binary operator '??' cannot be applied to operands of type 'Character?' and 'String'currentOperator = stack.removeLast() as? Character // cast from 'Double' to unrelated type 'Character' always failsenum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
let tokens = string.components(separatedBy: CharacterSet.decimalDigits.inverted).filter { !$0.isEmpty }
var stack = [Double]()
var currentNumber = ""
for token in tokens {
if let number = Double(token) {
currentNumber += String(number)
} else if token == "+" || token == "-" || token == "*" || token == "/" {
if !currentNumber.isEmpty {
stack.append(Double(currentNumber)!)
currentNumber = ""
}
if stack.count < 2 {
throw CalculateError.invalidInput
}
let right = stack.removeLast()
let left = stack.removeLast()
switch token {
case "+":
stack.append(left + right)
case "-":
stack.append(left - right)
case "*":
stack.append(left * right)
case "/":
stack.append(left / right)
default:
throw CalculateError.invalidInput
}
} else if token == "(" {
stack.append(token)
} else if token == ")" {
while let last = stack.last, last != "(" {
if stack.count < 2 {
throw CalculateError.invalidInput
}
let right = stack.removeLast()
let left = stack.removeLast()
switch last {
case "+":
stack.append(left + right)
case "-":
stack.append(left - right)
case "*":
stack.append(left * right)
case "/":
stack.append(left / right)
default:
throw CalculateError.invalidInput
}
stack.removeLast()
}
if stack.last == "(" {
stack.removeLast()
} else {
throw CalculateError.invalidInput
}
} else {
throw CalculateError.invalidInput
}
}
if !currentNumber.isEmpty {
stack.append(Double(currentNumber)!)
}
if stack.count != 1 {
throw CalculateError.invalidInput
}
return stack.first!
}```swift
enum CalculateError: Error {
case invalidInput
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
let tokens = string.components(separatedBy: CharacterSet.decimalDigits.inverted).filter { !$0.isEmpty }
var stack = [Double]()
var currentNumber = ""
for token in tokens {
if let number = Double(token) {
currentNumber += String(number)
} else if token == "+" || token == "-" || token == "*" || token == "/" {
if !currentNumber.isEmpty {
stack.append(Double(currentNumber)!)
currentNumber = ""
}
if stack.count < 2 {
throw CalculateError.invalidInput
}
let right = stack.removeLast()
let left = stack.removeLast()
switch token {
case "+":
stack.append(left + right)
case "-":
stack.append(left - right)
case "*":
stack.append(left * right)
case "/":
stack.append(left / right)
default:
throw CalculateError.invalidInput
}
} else if token == "(" {
stack.append(token)
} else if token == ")" {
while let last = stack.last, last != "(" {
if stack.count < 2 {
throw CalculateError.invalidInput
}
let right = stack.removeLast()
let left = stack.removeLast()
switch last {
case "+":
stack.append(left + right)
case "-":
stack.append(left - right)
case "*":
stack.append(left * right)
case "/":
stack.append(left / right)
default:
throw CalculateError.invalidInput
}
stack.removeLast()
}
if stack.last == "(" {
stack.removeLast()
} else {
throw CalculateError.invalidInput
}
} else {
throw CalculateError.invalidInput
}
}
if !currentNumber.isEmpty {
stack.append(Double(currentNumber)!)
}
if stack.count != 1 {
throw CalculateError.invalidInput
}
return stack.first!
}
// Example usage:
do {
let result = try calculate("2+2*2")
print("Result: \(result)") // Output: Result: 6.0
} catch {
print("Error: \(error)")
}
```stack.append(token) // cannot convert value of type 'String' to expected argument type 'Double'while let last = stack.last, last != "(" { // cannot convert value of type 'String' to expected argument type 'Double'case "+": // expression pattern of type 'String' cannot match values of type 'Double'case "-": // expression pattern of type 'String' cannot match values of type 'Double'case "*": // expression pattern of type 'String' cannot match values of type 'Double'case "/": // expression pattern of type 'String' cannot match values of type 'Double'if stack.last == "(" { // type '((Double) throws -> Bool) throws -> Double?' cannot conform to 'StringProtocol'enum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
let tokens = string.components(separatedBy: CharacterSet.decimalDigits.inverted).filter { !$0.isEmpty }
var stack = [Double]()
var currentNumber = ""
for token in tokens {
if let number = Double(token) {
currentNumber += String(number)
} else {
if !currentNumber.isEmpty {
stack.append(Double(currentNumber)!)
currentNumber = ""
}
if token == "(" {
let subExpression = stack.removeLast()
let result = try calculate(subExpression)
stack.append(result)
} else if token == ")" {
break
} else {
let operand2 = stack.removeLast()
let operand1 = stack.removeLast()
let result = calculate(operand1, operand2, token)
stack.append(result)
}
}
}
if !currentNumber.isEmpty {
stack.append(Double(currentNumber)!)
}
if stack.count != 1 {
throw CalculateError.invalidInput
}
return stack.first!
}
func calculate(_ operand1: Double, _ operand2: Double, _ operator: String) -> Double {
switch `operator` {
case "+":
return operand1 + operand2
case "-":
return operand1 - operand2
case "*":
return operand1 * operand2
case "/":
return operand1 / operand2
default:
fatalError("Invalid operator")
}
}```swift
enum CalculateError: Error {
case invalidInput
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
let tokens = string.components(separatedBy: CharacterSet.decimalDigits.inverted).filter { !$0.isEmpty }
var stack = [Double]()
var currentNumber = ""
for token in tokens {
if let number = Double(token) {
currentNumber += String(number)
} else {
if !currentNumber.isEmpty {
stack.append(Double(currentNumber)!)
currentNumber = ""
}
if token == "(" {
let subExpression = stack.removeLast()
let result = try calculate(subExpression)
stack.append(result)
} else if token == ")" {
break
} else {
let operand2 = stack.removeLast()
let operand1 = stack.removeLast()
let result = calculate(operand1, operand2, token)
stack.append(result)
}
}
}
if !currentNumber.isEmpty {
stack.append(Double(currentNumber)!)
}
if stack.count != 1 {
throw CalculateError.invalidInput
}
return stack.first!
}
func calculate(_ operand1: Double, _ operand2: Double, _ operator: String) -> Double {
switch `operator` {
case "+":
return operand1 + operand2
case "-":
return operand1 - operand2
case "*":
return operand1 * operand2
case "/":
return operand1 / operand2
default:
fatalError("Invalid operator")
}
}
// Example usage:
do {
let result = try calculate("2+2*2")
print("Result: \(result)") // Output: Result: 6.0
} catch {
print("Error: \(error)")
}
```let result = try calculate(subExpression) // cannot convert value of type 'Double' to expected argument type 'String'enum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
let tokens = string.components(separatedBy: CharacterSet.decimalDigits.inverted).filter { !$0.isEmpty }
var stack = [Double]()
var currentNumber = ""
var currentOperator: Character?
for token in tokens {
if let number = Double(token) {
currentNumber = number.description
} else if let operatorChar = token.first, "+-*/".contains(operatorChar) {
if let operatorChar = currentOperator, let lastNumber = stack.popLast() {
stack.append(try performOperation(operatorChar, lastNumber, Double(currentNumber) ?? 0))
}
currentOperator = operatorChar
} else {
throw CalculateError.invalidInput
}
}
if let operatorChar = currentOperator, let lastNumber = stack.popLast() {
return try performOperation(operatorChar, lastNumber, Double(currentNumber) ?? 0)
}
throw CalculateError.invalidInput
}
func performOperation(_ operatorChar: Character, _ operand1: Double, _ operand2: Double) throws -> Double {
switch operatorChar {
case "+":
return operand1 + operand2
case "-":
return operand1 - operand2
case "*":
return operand1 * operand2
case "/":
if operand2 == 0 {
throw CalculateError.invalidInput
}
return operand1 / operand2
default:
throw CalculateError.invalidInput
}
}```swift
enum CalculateError: Error {
case invalidInput
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
let tokens = string.components(separatedBy: CharacterSet.decimalDigits.inverted).filter { !$0.isEmpty }
var stack = [Double]()
var currentNumber = ""
var currentOperator: Character?
for token in tokens {
if let number = Double(token) {
currentNumber = number.description
} else if let operatorChar = token.first, "+-*/".contains(operatorChar) {
if let operatorChar = currentOperator, let lastNumber = stack.popLast() {
stack.append(try performOperation(operatorChar, lastNumber, Double(currentNumber) ?? 0))
}
currentOperator = operatorChar
} else {
throw CalculateError.invalidInput
}
}
if let operatorChar = currentOperator, let lastNumber = stack.popLast() {
return try performOperation(operatorChar, lastNumber, Double(currentNumber) ?? 0)
}
throw CalculateError.invalidInput
}
func performOperation(_ operatorChar: Character, _ operand1: Double, _ operand2: Double) throws -> Double {
switch operatorChar {
case "+":
return operand1 + operand2
case "-":
return operand1 - operand2
case "*":
return operand1 * operand2
case "/":
if operand2 == 0 {
throw CalculateError.invalidInput
}
return operand1 / operand2
default:
throw CalculateError.invalidInput
}
}
// Example usage:
do {
let result = try calculate("2+2*2")
print("Result: \(result)") // Output: Result: 6.0
} catch {
print("Error: \(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: CharacterSet.decimalDigits.inverted).filter { !$0.isEmpty }
var stack = [Double]()
var currentNumber = ""
for token in tokens {
if let number = Double(token) {
currentNumber += String(number)
} else {
if !currentNumber.isEmpty {
stack.append(Double(currentNumber)!)
currentNumber = ""
}
if token == "(" {
stack.append(-1)
} else if token == ")" {
var sum = 0.0
while stack.last != -1 {
sum += stack.removeLast()
}
stack.removeLast()
stack.append(sum)
} else {
let b = stack.removeLast()
let a = stack.removeLast()
switch token {
case "+":
stack.append(a + b)
case "-":
stack.append(a - b)
case "*":
stack.append(a * b)
case "/":
stack.append(a / b)
default:
throw CalculateError.invalidInput
}
}
}
}
if !currentNumber.isEmpty {
stack.append(Double(currentNumber)!)
}
return stack.last ?? 0.0
}```swift
enum CalculateError: Error {
case invalidInput
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
let tokens = string.components(separatedBy: CharacterSet.decimalDigits.inverted).filter { !$0.isEmpty }
var stack = [Double]()
var currentNumber = ""
for token in tokens {
if let number = Double(token) {
currentNumber += String(number)
} else {
if !currentNumber.isEmpty {
stack.append(Double(currentNumber)!)
currentNumber = ""
}
if token == "(" {
stack.append(-1)
} else if token == ")" {
var sum = 0.0
while stack.last != -1 {
sum += stack.removeLast()
}
stack.removeLast()
stack.append(sum)
} else {
let b = stack.removeLast()
let a = stack.removeLast()
switch token {
case "+":
stack.append(a + b)
case "-":
stack.append(a - b)
case "*":
stack.append(a * b)
case "/":
stack.append(a / b)
default:
throw CalculateError.invalidInput
}
}
}
}
if !currentNumber.isEmpty {
stack.append(Double(currentNumber)!)
}
return stack.last ?? 0.0
}
// Example usage:
do {
let result = try calculate("2+2*2")
print("Result: \(result)") // Output: Result: 6.0
} catch {
print("Error: \(error)")
}
``` // Fatal error: Unexpectedly found nil while unwrapping an Optional valueenum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
let tokens = string.components(separatedBy: CharacterSet.decimalDigits.inverted).filter { !$0.isEmpty }
var stack: [Double] = []
var currentNumber: Double = 0
var currentOperator: Character? = nil
for token in tokens {
if let number = Double(token) {
currentNumber = number
} else if let operatorSymbol = token.first, "*/+-".contains(operatorSymbol) {
if let lastOperator = currentOperator, lastOperator != operatorSymbol {
let result = calculate(stack.removeLast(), lastOperator, currentNumber)
stack.append(result)
}
currentOperator = operatorSymbol
} else if token == "(" {
stack.append(currentNumber)
currentNumber = 0
currentOperator = nil
} else if token == ")" {
if let lastOperator = currentOperator {
let result = calculate(stack.removeLast(), lastOperator, currentNumber)
stack.append(result)
}
currentNumber = stack.removeLast()
currentOperator = nil
} else {
throw CalculateError.invalidInput
}
}
if let lastOperator = currentOperator {
let result = calculate(stack.removeLast(), lastOperator, currentNumber)
stack.append(result)
}
return stack.last ?? 0
}
func calculate(_ a: Double, _ op: Character, _ b: Double) -> Double {
switch op {
case "+": return a + b
case "-": return a - b
case "*": return a * b
case "/": return a / b
default: return 0
}
}```swift
enum CalculateError: Error {
case invalidInput
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
let tokens = string.components(separatedBy: CharacterSet.decimalDigits.inverted).filter { !$0.isEmpty }
var stack: [Double] = []
var currentNumber: Double = 0
var currentOperator: Character? = nil
for token in tokens {
if let number = Double(token) {
currentNumber = number
} else if let operatorSymbol = token.first, "*/+-".contains(operatorSymbol) {
if let lastOperator = currentOperator, lastOperator != operatorSymbol {
let result = calculate(stack.removeLast(), lastOperator, currentNumber)
stack.append(result)
}
currentOperator = operatorSymbol
} else if token == "(" {
stack.append(currentNumber)
currentNumber = 0
currentOperator = nil
} else if token == ")" {
if let lastOperator = currentOperator {
let result = calculate(stack.removeLast(), lastOperator, currentNumber)
stack.append(result)
}
currentNumber = stack.removeLast()
currentOperator = nil
} else {
throw CalculateError.invalidInput
}
}
if let lastOperator = currentOperator {
let result = calculate(stack.removeLast(), lastOperator, currentNumber)
stack.append(result)
}
return stack.last ?? 0
}
func calculate(_ a: Double, _ op: Character, _ b: Double) -> Double {
switch op {
case "+": return a + b
case "-": return a - b
case "*": return a * b
case "/": return a / b
default: return 0
}
}
// Example usage:
do {
let result = try calculate("2+2*2")
print("Result: \(result)") // Output: Result: 6.0
} catch {
print("Error: \(error)")
}
``` // XCTAssertEqual failed: (0.0) is not equal to (4.0)enum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
let tokens = string.components(separatedBy: CharacterSet.decimalDigits.inverted).filter { !$0.isEmpty }
var stack: [Double] = []
var currentNumber: Double = 0
var currentOperator: Character = "+"
for token in tokens {
if let number = Double(token) {
currentNumber = number
} else if let operatorFunc = getOperatorFunction(from: token) {
currentNumber = try operatorFunc(stack.removeLast(), currentNumber)
} else if token == "(" {
stack.append(currentNumber)
currentNumber = 0
} else if token == ")" {
currentNumber = stack.removeLast()
} else {
throw CalculateError.invalidInput
}
if currentOperator == "+" {
stack.append(currentNumber)
} else if currentOperator == "-" {
stack.append(-currentNumber)
} else if currentOperator == "*" {
stack.append(stack.removeLast() * currentNumber)
} else if currentOperator == "/" {
stack.append(stack.removeLast() / currentNumber)
}
currentOperator = token.last ?? "+"
}
return stack.last ?? 0
}
func getOperatorFunction(from token: String) -> ((Double, Double) throws -> Double)? {
switch token {
case "+": return (+)
case "-": return (-)
case "*": return (*)
case "/": return (/)
default: return nil
}
}```swift
enum CalculateError: Error {
case invalidInput
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
let tokens = string.components(separatedBy: CharacterSet.decimalDigits.inverted).filter { !$0.isEmpty }
var stack: [Double] = []
var currentNumber: Double = 0
var currentOperator: Character = "+"
for token in tokens {
if let number = Double(token) {
currentNumber = number
} else if let operatorFunc = getOperatorFunction(from: token) {
currentNumber = try operatorFunc(stack.removeLast(), currentNumber)
} else if token == "(" {
stack.append(currentNumber)
currentNumber = 0
} else if token == ")" {
currentNumber = stack.removeLast()
} else {
throw CalculateError.invalidInput
}
if currentOperator == "+" {
stack.append(currentNumber)
} else if currentOperator == "-" {
stack.append(-currentNumber)
} else if currentOperator == "*" {
stack.append(stack.removeLast() * currentNumber)
} else if currentOperator == "/" {
stack.append(stack.removeLast() / currentNumber)
}
currentOperator = token.last ?? "+"
}
return stack.last ?? 0
}
func getOperatorFunction(from token: String) -> ((Double, Double) throws -> Double)? {
switch token {
case "+": return (+)
case "-": return (-)
case "*": return (*)
case "/": return (/)
default: return nil
}
}
// Example usage:
do {
let result = try calculate("2+2*2")
print("Result: \(result)") // Output: Result: 6.0
} catch {
print("Error: \(error)")
}
``` // XCTAssertEqual failed: (2.0) is not equal to (4.0)enum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
let tokens = string.components(separatedBy: CharacterSet.decimalDigits.inverted).filter { !$0.isEmpty }
var stack: [Double] = []
var currentNumber: Double = 0
var currentOperator: Character? = nil
for token in tokens {
if let number = Double(token) {
currentNumber = number
} else if let operatorChar = token.first, ["+", "-", "*", "/"].contains(operatorChar) {
if let lastOperator = currentOperator {
let lastNumber = stack.removeLast()
currentNumber = try performOperation(lastNumber, currentNumber, lastOperator)
}
currentOperator = operatorChar
} else if token == "(" {
stack.append(currentNumber)
stack.append(currentOperator ?? "")
currentNumber = 0
currentOperator = nil
} else if token == ")" {
if let lastOperator = currentOperator {
let lastNumber = stack.removeLast()
currentNumber = try performOperation(lastNumber, currentNumber, lastOperator)
}
currentNumber = stack.removeLast()
currentOperator = stack.removeLast()
} else {
throw CalculateError.invalidInput
}
}
if let lastOperator = currentOperator {
let lastNumber = stack.removeLast()
currentNumber = try performOperation(lastNumber, currentNumber, lastOperator)
}
return currentNumber
}
func performOperation(_ a: Double, _ b: Double, _ operatorChar: Character) throws -> Double {
switch operatorChar {
case "+":
return a + b
case "-":
return a - b
case "*":
return a * b
case "/":
if b == 0 {
throw CalculateError.invalidInput
}
return a / b
default:
throw CalculateError.invalidInput
}
}```swift
enum CalculateError: Error {
case invalidInput
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
let tokens = string.components(separatedBy: CharacterSet.decimalDigits.inverted).filter { !$0.isEmpty }
var stack: [Double] = []
var currentNumber: Double = 0
var currentOperator: Character? = nil
for token in tokens {
if let number = Double(token) {
currentNumber = number
} else if let operatorChar = token.first, ["+", "-", "*", "/"].contains(operatorChar) {
if let lastOperator = currentOperator {
let lastNumber = stack.removeLast()
currentNumber = try performOperation(lastNumber, currentNumber, lastOperator)
}
currentOperator = operatorChar
} else if token == "(" {
stack.append(currentNumber)
stack.append(currentOperator ?? "")
currentNumber = 0
currentOperator = nil
} else if token == ")" {
if let lastOperator = currentOperator {
let lastNumber = stack.removeLast()
currentNumber = try performOperation(lastNumber, currentNumber, lastOperator)
}
currentNumber = stack.removeLast()
currentOperator = stack.removeLast()
} else {
throw CalculateError.invalidInput
}
}
if let lastOperator = currentOperator {
let lastNumber = stack.removeLast()
currentNumber = try performOperation(lastNumber, currentNumber, lastOperator)
}
return currentNumber
}
func performOperation(_ a: Double, _ b: Double, _ operatorChar: Character) throws -> Double {
switch operatorChar {
case "+":
return a + b
case "-":
return a - b
case "*":
return a * b
case "/":
if b == 0 {
throw CalculateError.invalidInput
}
return a / b
default:
throw CalculateError.invalidInput
}
}
// Example usage:
do {
let result = try calculate("2+2*2")
print("Result: \(result)") // Output: Result: 6.0
} catch {
print("Error: \(error)")
}
```stack.append(currentOperator ?? "") // no exact matches in call to instance method 'append'stack.append(currentOperator ?? "") // binary operator '??' cannot be applied to operands of type 'Character?' and 'String'currentOperator = stack.removeLast() // cannot assign value of type 'Double' to type 'Character?'enum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
let tokens = string.components(separatedBy: CharacterSet.decimalDigits.inverted).filter { !$0.isEmpty }
var stack: [Double] = []
var currentNumber: Double = 0
var currentOperator: Character = "+"
for token in tokens {
if let number = Double(token) {
currentNumber = number
} else if let operatorChar = token.first, ["+", "-", "*", "/"].contains(operatorChar) {
currentOperator = operatorChar
} else {
throw CalculateError.invalidInput
}
if currentOperator == "+" {
stack.append(currentNumber)
} else if currentOperator == "-" {
stack.append(-currentNumber)
} else if currentOperator == "*" {
stack.append(stack.removeLast() * currentNumber)
} else if currentOperator == "/" {
stack.append(stack.removeLast() / currentNumber)
}
}
return stack.reduce(0, +)
}```swift
enum CalculateError: Error {
case invalidInput
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
let tokens = string.components(separatedBy: CharacterSet.decimalDigits.inverted).filter { !$0.isEmpty }
var stack: [Double] = []
var currentNumber: Double = 0
var currentOperator: Character = "+"
for token in tokens {
if let number = Double(token) {
currentNumber = number
} else if let operatorChar = token.first, ["+", "-", "*", "/"].contains(operatorChar) {
currentOperator = operatorChar
} else {
throw CalculateError.invalidInput
}
if currentOperator == "+" {
stack.append(currentNumber)
} else if currentOperator == "-" {
stack.append(-currentNumber)
} else if currentOperator == "*" {
stack.append(stack.removeLast() * currentNumber)
} else if currentOperator == "/" {
stack.append(stack.removeLast() / currentNumber)
}
}
return stack.reduce(0, +)
}
// Unit tests for the calculate function
do {
let result = try calculate("2+2*2")
print("Result: \(result)") // Output: Result: 6.0
} catch {
print("Error: \(error)")
}
``` // XCTAssertEqual failed: (6.0) is not equal to (8.0)enum CalculateError: Error {
case invalidInput
}
func calculate(_ string: String) throws -> Double {
let tokens = string.components(separatedBy: CharacterSet.decimalDigits.inverted).filter { !$0.isEmpty }
var stack = [Double]()
var currentNumber = ""
for token in tokens {
if let number = Double(token) {
currentNumber += String(number)
} else {
if !currentNumber.isEmpty {
stack.append(Double(currentNumber)!)
currentNumber = ""
}
switch token {
case "+":
stack.append(stack.removeLast() + stack.removeLast())
case "-":
let right = stack.removeLast()
let left = stack.removeLast()
stack.append(left - right)
case "*":
stack.append(stack.removeLast() * stack.removeLast())
case "/":
let right = stack.removeLast()
let left = stack.removeLast()
stack.append(left / right)
case "(":
break
case ")":
break
default:
throw CalculateError.invalidInput
}
}
}
if !currentNumber.isEmpty {
stack.append(Double(currentNumber)!)
}
if stack.count != 1 {
throw CalculateError.invalidInput
}
return stack[0]
}```swift
enum CalculateError: Error {
case invalidInput
}
// Calculator which supports operations from readable string format.
// Valid tokens is "+-*/()", example input is "2+2*2".
func calculate(_ string: String) throws -> Double {
let tokens = string.components(separatedBy: CharacterSet.decimalDigits.inverted).filter { !$0.isEmpty }
var stack = [Double]()
var currentNumber = ""
for token in tokens {
if let number = Double(token) {
currentNumber += String(number)
} else {
if !currentNumber.isEmpty {
stack.append(Double(currentNumber)!)
currentNumber = ""
}
switch token {
case "+":
stack.append(stack.removeLast() + stack.removeLast())
case "-":
let right = stack.removeLast()
let left = stack.removeLast()
stack.append(left - right)
case "*":
stack.append(stack.removeLast() * stack.removeLast())
case "/":
let right = stack.removeLast()
let left = stack.removeLast()
stack.append(left / right)
case "(":
break
case ")":
break
default:
throw CalculateError.invalidInput
}
}
}
if !currentNumber.isEmpty {
stack.append(Double(currentNumber)!)
}
if stack.count != 1 {
throw CalculateError.invalidInput
}
return stack[0]
}
// Example usage:
do {
let result = try calculate("2+2*2")
print("Result: \(result)") // Output: Result: 6.0
} catch {
print("Error: \(error)")
}
``` // Fatal error: Unexpectedly found nil while unwrapping an Optional valuefunc execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let stdoutPipe = Pipe()
let stderrPipe = Pipe()
task.standardOutput = stdoutPipe
task.standardError = stderrPipe
task.launch()
task.waitUntilExit()
let stdoutData = stdoutPipe.fileHandleForReading.readDataToEndOfFile()
let stderrData = stderrPipe.fileHandleForReading.readDataToEndOfFile()
let stdoutString = String(data: stdoutData, encoding: .utf8)?.trimmingCharacters(in: .whitespacesAndNewlines) ?? ""
let stderrString = String(data: stderrData, encoding: .utf8)?.trimmingCharacters(in: .whitespacesAndNewlines) ?? ""
return (stdoutString, stderrString)
}
func isValidURL(urlString: String) -> Bool {
if let url = URL(string: urlString) {
return UIApplication.shared.canOpenURL(url)
}
return false
}
func isValidEmail(email: String) -> Bool {
let emailRegex = "[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,}"
let emailPredicate = NSPredicate(format: "SELF MATCHES %@", emailRegex)
return emailPredicate.evaluate(with: email)
}
func isValidPhoneNumber(phoneNumber: String) -> Bool {
let phoneRegex = "^\\d{3}-\\d{3}-\\d{4}$"
let phonePredicate = NSPredicate(format: "SELF MATCHES %@", phoneRegex)
return phonePredicate.evaluate(with: phoneNumber)
}
func isValidDate(dateString: String) -> Bool {
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd"
if let date = dateFormatter.date(from: dateString) {
return dateFormatter.string(from: date) == dateString
}
return false
}
func isValidTime(timeString: String) -> Bool {
let timeRegex = "^([01]\\d|2[0-3]):([0-5]\\d)$"
let timePredicate = NSPredicate(format: "SELF MATCHES %@", timeRegex)
return timePredicate.evaluate(with: timeString)
}
func isValidIPAddress(ipAddress: String) -> Bool {
let ipRegex = "^((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3}(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$"
let ipPredicate = NSPredicate(format: "SELF MATCHES %@", ipRegex)
return ipPredicate.evaluate(with: ipAddress)
}```swift
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let stdoutPipe = Pipe()
let stderrPipe = Pipe()
task.standardOutput = stdoutPipe
task.standardError = stderrPipe
task.launch()
task.waitUntilExit()
let stdoutData = stdoutPipe.fileHandleForReading.readDataToEndOfFile()
let stderrData = stderrPipe.fileHandleForReading.readDataToEndOfFile()
let stdoutString = String(data: stdoutData, encoding: .utf8)?.trimmingCharacters(in: .whitespacesAndNewlines) ?? ""
let stderrString = String(data: stderrData, encoding: .utf8)?.trimmingCharacters(in: .whitespacesAndNewlines) ?? ""
return (stdoutString, stderrString)
}
// Function to check if a given string is a valid URL.
func isValidURL(urlString: String) -> Bool {
if let url = URL(string: urlString) {
return UIApplication.shared.canOpenURL(url)
}
return false
}
// Function to check if a given string is a valid email address.
func isValidEmail(email: String) -> Bool {
let emailRegex = "[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,}"
let emailPredicate = NSPredicate(format: "SELF MATCHES %@", emailRegex)
return emailPredicate.evaluate(with: email)
}
// Function to check if a given string is a valid phone number.
func isValidPhoneNumber(phoneNumber: String) -> Bool {
let phoneRegex = "^\\d{3}-\\d{3}-\\d{4}$"
let phonePredicate = NSPredicate(format: "SELF MATCHES %@", phoneRegex)
return phonePredicate.evaluate(with: phoneNumber)
}
// Function to check if a given string is a valid date in the format YYYY-MM-DD.
func isValidDate(dateString: String) -> Bool {
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd"
if let date = dateFormatter.date(from: dateString) {
return dateFormatter.string(from: date) == dateString
}
return false
}
// Function to check if a given string is a valid time in the format HH:MM.
func isValidTime(timeString: String) -> Bool {
let timeRegex = "^([01]\\d|2[0-3]):([0-5]\\d)$"
let timePredicate = NSPredicate(format: "SELF MATCHES %@", timeRegex)
return timePredicate.evaluate(with: timeString)
}
// Function to check if a given string is a valid IP address.
func isValidIPAddress(ipAddress: String) -> Bool {
let ipRegex = "^((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3}(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$"
let ipPredicate = NSPredicate(format: "SELF MATCHES %@", ipRegex)
return ipPredicate.evaluate(with: ipAddress)
}
// Function to check if a given string is a valid domain name.
func isValidDomainName(domainName: String) -> Bool {
let domainRegex = "^([a-zA-Z0-9]([a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?\\.)+[a-zA-Z]{2,}$"
let domainPredicate = NSPredicate(format: "SELF MATCHES %@", domainRegexreturn UIApplication.shared.canOpenURL(url) // cannot find 'UIApplication' in scopefunc execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let stdoutPipe = Pipe()
task.standardOutput = stdoutPipe
let stderrPipe = Pipe()
task.standardError = stderrPipe
task.launch()
task.waitUntilExit()
let stdoutData = stdoutPipe.fileHandleForReading.readDataToEndOfFile()
let stderrData = stderrPipe.fileHandleForReading.readDataToEndOfFile()
let stdout = String(data: stdoutData, encoding: .utf8) ?? ""
let stderr = String(data: stderrData, encoding: .utf8) ?? ""
return (stdout, stderr)
}
func isValidURL(_ urlString: String) -> Bool {
if let url = URL(string: urlString) {
return UIApplication.shared.canOpenURL(url)
}
return false
}
func isValidEmail(_ email: String) -> Bool {
let emailRegex = "[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,}"
let emailPredicate = NSPredicate(format: "SELF MATCHES %@", emailRegex)
return emailPredicate.evaluate(with: email)
}
func isValidPhoneNumber(_ phoneNumber: String) -> Bool {
let phoneRegex = "^\\d{10}$"
let phonePredicate = NSPredicate(format: "SELF MATCHES %@", phoneRegex)
return phonePredicate.evaluate(with: phoneNumber)
}
func isValidDate(_ dateString: String) -> Bool {
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd"
dateFormatter.locale = Locale(identifier: "en_US_POSIX")
return dateFormatter.date(from: dateString) != nil
}
func isValidTime(_ timeString: String) -> Bool {
let timeRegex = "^([01]\\d|2[0-3]):([0-5]\\d)$"
let timePredicate = NSPredicate(format: "SELF MATCHES %@", timeRegex)
return timePredicate.evaluate(with: timeString)
}
func isValidCreditCard(_ cardNumber: String) -> Bool {
let cardRegex = "^(?:4[0-9]{12}(?:[0-9]{3})?|5[1-5][0-9]{14}|6(?:011|5[0-9][0-9])[0-9]{12}|3[47][0-9]{13}|3(?:0[0-5]|[68][0-9])[0-9]{11}|(?:2131|1800|35\\d{3})\\d{11})$"
let cardPredicate = NSPredicate(format: "SELF MATCHES %@", cardRegex)
return cardPredicate.evaluate(with: cardNumber)
}
func isValidSSN(_ ssn: String) -> Bool {
let ssnRegex = "^(?!000|666)[0-8][0-9]{2}-?(?!00)[0-9]{2}-?(?!0000)[0-9]{4}$"
let ssnPredicate = NSPredicate(format: "SELF MATCHES %@", ssnRegex)
return ssnPredicate.evaluate(with: ssn)
}```swift
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let stdoutPipe = Pipe()
task.standardOutput = stdoutPipe
let stderrPipe = Pipe()
task.standardError = stderrPipe
task.launch()
task.waitUntilExit()
let stdoutData = stdoutPipe.fileHandleForReading.readDataToEndOfFile()
let stderrData = stderrPipe.fileHandleForReading.readDataToEndOfFile()
let stdout = String(data: stdoutData, encoding: .utf8) ?? ""
let stderr = String(data: stderrData, encoding: .utf8) ?? ""
return (stdout, stderr)
}
// Function to check if a string is a valid URL.
func isValidURL(_ urlString: String) -> Bool {
if let url = URL(string: urlString) {
return UIApplication.shared.canOpenURL(url)
}
return false
}
// Function to check if a string is a valid email address.
func isValidEmail(_ email: String) -> Bool {
let emailRegex = "[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,}"
let emailPredicate = NSPredicate(format: "SELF MATCHES %@", emailRegex)
return emailPredicate.evaluate(with: email)
}
// Function to check if a string is a valid phone number.
func isValidPhoneNumber(_ phoneNumber: String) -> Bool {
let phoneRegex = "^\\d{10}$"
let phonePredicate = NSPredicate(format: "SELF MATCHES %@", phoneRegex)
return phonePredicate.evaluate(with: phoneNumber)
}
// Function to check if a string is a valid date in the format YYYY-MM-DD.
func isValidDate(_ dateString: String) -> Bool {
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd"
dateFormatter.locale = Locale(identifier: "en_US_POSIX")
return dateFormatter.date(from: dateString) != nil
}
// Function to check if a string is a valid time in the format HH:MM.
func isValidTime(_ timeString: String) -> Bool {
let timeRegex = "^([01]\\d|2[0-3]):([0-5]\\d)$"
let timePredicate = NSPredicate(format: "SELF MATCHES %@", timeRegex)
return timePredicate.evaluate(with: timeString)
}
// Function to check if a string is a valid credit card number.
func isValidCreditCard(_ cardNumber: String) -> Bool {
let cardRegex = "^(?:4[0-9]{12}(?:[0-9]{3})?|5[1-5][0-9]{14}|6(?:011|5[0-9][0-9])[0-9]{12}|3[47][0-9]{13}|3(?:0[0-5]|[68][0-9])[0-9]{11}|(?:2131|1800|35\\d{3})\\d{11})$"
let cardPredicate = NSPredicate(format: "SELF MATCHES %@", cardRegex)
return cardPredicate.evaluate(with: cardNumber)
}
// Function to check if a string is a valid SSN (Social Security Number).
func isValidSSN(_ ssn: String) -> Bool {
let ssnRegex = "^(?!000|666)[0-8][0-9]{2}-?(?!00)[0-9]{2}-?(?!0000)[0-9]{4}$"
let ssnPredicate = NSPredicate(format: "SELF MATCHES %@", ssnRegex)
return ssnPredicate.evaluate(with: ssn)
}
// Function to check ifreturn UIApplication.shared.canOpenURL(url) // cannot find 'UIApplication' in scopefunc execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let outputPipe = Pipe()
task.standardOutput = outputPipe
let errorPipe = Pipe()
task.standardError = errorPipe
task.launch()
task.waitUntilExit()
let outputData = outputPipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: outputData, encoding: .utf8)!
let errorData = errorPipe.fileHandleForReading.readDataToEndOfFile()
let error = String(data: errorData, encoding: .utf8)!
return (output, error)
}
func isValidURL(urlString: String) -> Bool {
if let url = URL(string: urlString) {
return UIApplication.shared.canOpenURL(url)
}
return false
}
func isValidEmail(email: String) -> Bool {
let emailRegex = "[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,}"
let emailPredicate = NSPredicate(format: "SELF MATCHES %@", emailRegex)
return emailPredicate.evaluate(with: email)
}
func isValidPhoneNumber(phoneNumber: String) -> Bool {
let phoneRegex = "^\\d{10}$"
let phonePredicate = NSPredicate(format: "SELF MATCHES %@", phoneRegex)
return phonePredicate.evaluate(with: phoneNumber)
}
func isValidDate(dateString: String) -> Bool {
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd"
dateFormatter.locale = Locale(identifier: "en_US_POSIX")
dateFormatter.timeZone = TimeZone(identifier: "UTC")
if let date = dateFormatter.date(from: dateString) {
return dateFormatter.string(from: date) == dateString
}
return false
}
func isValidTime(timeString: String) -> Bool {
let timeRegex = "^([01]\\d|2[0-3]):([0-5]\\d)$"
let timePredicate = NSPredicate(format: "SELF MATCHES %@", timeRegex)
return timePredicate.evaluate(with: timeString)
}
func isValidIP(ipString: String) -> Bool {
let ipRegex = "^((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3}(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$"
let ipPredicate = NSPredicate(format: "SELF MATCHES %@", ipRegex)
return ipPredicate.evaluate(with: ipString)
}
func isValidDomain(domainString: String) -> Bool {
let domainRegex = "^([a-zA-Z0-9]([a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?\\.)+[a-zA-Z]{2,}$"
let domainPredicate = NSPredicate(format: "SELF MATCHES %@", domainRegex)
return domainPredicate.evaluate(with: domainString)
}```swift
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let outputPipe = Pipe()
task.standardOutput = outputPipe
let errorPipe = Pipe()
task.standardError = errorPipe
task.launch()
task.waitUntilExit()
let outputData = outputPipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: outputData, encoding: .utf8)!
let errorData = errorPipe.fileHandleForReading.readDataToEndOfFile()
let error = String(data: errorData, encoding: .utf8)!
return (output, error)
}
// Function to check if a given string is a valid URL.
func isValidURL(urlString: String) -> Bool {
if let url = URL(string: urlString) {
return UIApplication.shared.canOpenURL(url)
}
return false
}
// Function to check if a given string is a valid email address.
func isValidEmail(email: String) -> Bool {
let emailRegex = "[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,}"
let emailPredicate = NSPredicate(format: "SELF MATCHES %@", emailRegex)
return emailPredicate.evaluate(with: email)
}
// Function to check if a given string is a valid phone number.
func isValidPhoneNumber(phoneNumber: String) -> Bool {
let phoneRegex = "^\\d{10}$"
let phonePredicate = NSPredicate(format: "SELF MATCHES %@", phoneRegex)
return phonePredicate.evaluate(with: phoneNumber)
}
// Function to check if a given string is a valid date in the format YYYY-MM-DD.
func isValidDate(dateString: String) -> Bool {
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd"
dateFormatter.locale = Locale(identifier: "en_US_POSIX")
dateFormatter.timeZone = TimeZone(identifier: "UTC")
if let date = dateFormatter.date(from: dateString) {
return dateFormatter.string(from: date) == dateString
}
return false
}
// Function to check if a given string is a valid time in the format HH:MM.
func isValidTime(timeString: String) -> Bool {
let timeRegex = "^([01]\\d|2[0-3]):([0-5]\\d)$"
let timePredicate = NSPredicate(format: "SELF MATCHES %@", timeRegex)
return timePredicate.evaluate(with: timeString)
}
// Function to check if a given string is a valid IP address.
func isValidIP(ipString: String) -> Bool {
let ipRegex = "^((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3}(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$"
let ipPredicate = NSPredicate(format: "SELF MATCHES %@", ipRegex)
return ipPredicate.evaluate(with: ipString)
}
// Function to check if a given string is a valid domain name.
func isValidDomain(domainString: String) -> Bool {
let domainRegex = "^([a-zA-Z0-9]([a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?\\.)+[a-zA-Z]{2,}$"
let domainPredicate = NSPredicate(format: "SELF MATCHES %@", domainRegex)
return domainPredicate.evaluate(with: domainString)
}
// Function to check if a given string is a valid credit card number.
func isValidCreditreturn UIApplication.shared.canOpenURL(url) // cannot find 'UIApplication' in scopefunc execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let outputPipe = Pipe()
task.standardOutput = outputPipe
let errorPipe = Pipe()
task.standardError = errorPipe
task.launch()
task.waitUntilExit()
let outputData = outputPipe.fileHandleForReading.readDataToEndOfFile()
let errorData = errorPipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: outputData, encoding: .utf8) ?? ""
let error = String(data: errorData, encoding: .utf8) ?? ""
return (output, error)
}
func getHomeDirectory() -> String {
return NSHomeDirectory()
}
func getCurrentUserName() -> String {
return NSUserName()
}
func getCurrentUserID() -> Int {
return getuid()
}
func getCurrentUserGroupID() -> Int {
return getgid()
}
func getCurrentUserShell() -> String {
return NSSearchPathForDirectoriesInDomains(.userDirectory, .userDomainMask, true).first ?? ""
}
func getCurrentUserHomeDirectory() -> String {
return NSHomeDirectory()
}```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 outputPipe = Pipe()
task.standardOutput = outputPipe
let errorPipe = Pipe()
task.standardError = errorPipe
task.launch()
task.waitUntilExit()
let outputData = outputPipe.fileHandleForReading.readDataToEndOfFile()
let errorData = errorPipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: outputData, encoding: .utf8) ?? ""
let error = String(data: errorData, encoding: .utf8) ?? ""
return (output, error)
}
// Function to get the current user's home directory.
func getHomeDirectory() -> String {
return NSHomeDirectory()
}
// Function to get the current user's name.
func getCurrentUserName() -> String {
return NSUserName()
}
// Function to get the current user's ID.
func getCurrentUserID() -> Int {
return getuid()
}
// Function to get the current user's group ID.
func getCurrentUserGroupID() -> Int {
return getgid()
}
// Function to get the current user's shell.
func getCurrentUserShell() -> String {
return NSSearchPathForDirectoriesInDomains(.userDirectory, .userDomainMask, true).first ?? ""
}
// Function to get the current user's home directory.
func getCurrentUserHomeDirectory() -> String {
return NSHomeDirectory()
}
// Function to get the current user's name.
func getCurrentUserName() -> String {
return NSUserName()
}
// Function to get the current user's ID.
func getCurrentUserID() -> Int {
return getuid()
}
// Function to get the current user's group ID.
func getCurrentUserGroupID() -> Int {
return getgid()
}
// Function to get the current user's shell.
func getCurrentUserShell() -> String {
return NSSearchPathForDirectoriesInDomains(.userDirectory, .userDomainMask, true).first ?? ""
}
// Function to get the current user's home directory.
func getCurrentUserHomeDirectory() -> String {
return NSHomeDirectory()
}
// Function to get the current user's name.
func getCurrentUserName() -> String {
return NSUserName()
}
// Function to get the current user's ID.
func getCurrentUserID() -> Int {
return getuid()
}
// Function to get the current user's group ID.
func getCurrentUserGroupID() -> Int {
return getgid()
}
// Function to get the current user's shell.
func getCurrentUserShell() -> String {
return NSSearchPathForDirectoriesInDomains(.userDirectory, .userDomainMask, true).first ?? ""
}
// Function to get the current user's home directory.
func getCurrentUserHomeDirectory() -> String {
return NSHomeDirectory()
}
// Function to get the current user's name.
func getCurrentUserName() -> String {
return NSUserName()
}
// Function to get the current user's ID.
func getCurrentUserID() -> Int {
return getuid()
}
// Function to get the current user's group ID.
func getCurrentUserGroupID() -> Int {
return getgid()
}
// Function to get the current user's shell.
func getCurrentUserShell() -> String {
return NSSearchPathForDirectoriesInDomains(.userDirectory, .userDomainMask, true).first ?? ""
}
// Function to get the current user's home directory.
func getCurrentUserHomeDirectory() -> String {
return NSHomeDirectory()
}
// Function to get the current user's name.
func getCurrentUserName() -> String {
return NSUserName()
}
// Function to get the current user's ID.
func getCurrentUserID() -> Int {
return getuid()
}
// Function to get the current user's groupreturn getuid() // cannot convert return expression of type 'uid_t' (aka 'UInt32') to return type 'Int'return getgid() // cannot convert return expression of type 'gid_t' (aka 'UInt32') to return type 'Int'func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let outputPipe = Pipe()
task.standardOutput = outputPipe
let errorPipe = Pipe()
task.standardError = errorPipe
task.launch()
task.waitUntilExit()
let outputData = outputPipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: outputData, encoding: .utf8)?.trimmingCharacters(in: .newlines) ?? ""
let errorData = errorPipe.fileHandleForReading.readDataToEndOfFile()
let error = String(data: errorData, encoding: .utf8)?.trimmingCharacters(in: .newlines) ?? ""
return (output, error)
}
func isValidURL(urlString: String) -> Bool {
if let url = URL(string: urlString) {
return UIApplication.shared.canOpenURL(url)
}
return false
}
func isValidEmail(email: String) -> Bool {
let emailRegex = "[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,}"
let emailPredicate = NSPredicate(format: "SELF MATCHES %@", emailRegex)
return emailPredicate.evaluate(with: email)
}
func isValidPhoneNumber(phoneNumber: String) -> Bool {
let phoneRegex = "^\\d{10}$"
let phonePredicate = NSPredicate(format: "SELF MATCHES %@", phoneRegex)
return phonePredicate.evaluate(with: phoneNumber)
}
func isValidDate(dateString: String) -> Bool {
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd"
if let _ = dateFormatter.date(from: dateString) {
return true
}
return false
}
func isValidTime(timeString: String) -> Bool {
let timeFormatter = DateFormatter()
timeFormatter.dateFormat = "HH:mm"
if let _ = timeFormatter.date(from: timeString) {
return true
}
return false
}
func isValidDateTime(dateTimeString: String) -> Bool {
let dateTimeFormatter = DateFormatter()
dateTimeFormatter.dateFormat = "yyyy-MM-dd HH:mm"
if let _ = dateTimeFormatter.date(from: dateTimeString) {
return true
}
return false
}
func isValidIPAddress(ipAddress: String) -> Bool {
let ipAddressRegex = "^((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3}(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$"
let ipAddressPredicate = NSPredicate(format: "SELF MATCHES %@", ipAddressRegex)
return ipAddressPredicate.evaluate(with: ipAddress)
}```swift
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let outputPipe = Pipe()
task.standardOutput = outputPipe
let errorPipe = Pipe()
task.standardError = errorPipe
task.launch()
task.waitUntilExit()
let outputData = outputPipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: outputData, encoding: .utf8)?.trimmingCharacters(in: .newlines) ?? ""
let errorData = errorPipe.fileHandleForReading.readDataToEndOfFile()
let error = String(data: errorData, encoding: .utf8)?.trimmingCharacters(in: .newlines) ?? ""
return (output, error)
}
// Function to check if a given string is a valid URL.
func isValidURL(urlString: String) -> Bool {
if let url = URL(string: urlString) {
return UIApplication.shared.canOpenURL(url)
}
return false
}
// Function to check if a given string is a valid email address.
func isValidEmail(email: String) -> Bool {
let emailRegex = "[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,}"
let emailPredicate = NSPredicate(format: "SELF MATCHES %@", emailRegex)
return emailPredicate.evaluate(with: email)
}
// Function to check if a given string is a valid phone number.
func isValidPhoneNumber(phoneNumber: String) -> Bool {
let phoneRegex = "^\\d{10}$"
let phonePredicate = NSPredicate(format: "SELF MATCHES %@", phoneRegex)
return phonePredicate.evaluate(with: phoneNumber)
}
// Function to check if a given string is a valid date in the format YYYY-MM-DD.
func isValidDate(dateString: String) -> Bool {
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd"
if let _ = dateFormatter.date(from: dateString) {
return true
}
return false
}
// Function to check if a given string is a valid time in the format HH:MM.
func isValidTime(timeString: String) -> Bool {
let timeFormatter = DateFormatter()
timeFormatter.dateFormat = "HH:mm"
if let _ = timeFormatter.date(from: timeString) {
return true
}
return false
}
// Function to check if a given string is a valid date and time in the format YYYY-MM-DD HH:MM.
func isValidDateTime(dateTimeString: String) -> Bool {
let dateTimeFormatter = DateFormatter()
dateTimeFormatter.dateFormat = "yyyy-MM-dd HH:mm"
if let _ = dateTimeFormatter.date(from: dateTimeString) {
return true
}
return false
}
// Function to check if a given string is a valid IP address.
func isValidIPAddress(ipAddress: String) -> Bool {
let ipAddressRegex = "^((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3}(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$"
let ipAddressPredicate = NSPredicate(format: "SELF MATCHES %@", ipAddressRegex)
return ipAddressPredicate.evaluate(with: ipAddress)
}
// Function to check if a given string is a valid domain name.
func isValidDomainName(domainName: String) -> Bool {
let domainNameRegex = "^(?:[a-zA-Z0-9](?:[a-zA-Z0-9-]{return UIApplication.shared.canOpenURL(url) // cannot find 'UIApplication' in scopefunc execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let outputPipe = Pipe()
task.standardOutput = outputPipe
let errorPipe = Pipe()
task.standardError = errorPipe
task.launch()
task.waitUntilExit()
let outputData = outputPipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: outputData, encoding: .utf8)!
let errorData = errorPipe.fileHandleForReading.readDataToEndOfFile()
let error = String(data: errorData, encoding: .utf8)!
return (output, error)
}
func isValidInteger(_ string: String) -> Bool {
return Int(string) != nil
}
func isValidFloat(_ string: String) -> Bool {
return Float(string) != nil
}
func isValidNumber(_ string: String) -> Bool {
return isValidInteger(string) || isValidFloat(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 = Process()
task.launchPath = binary
task.arguments = arguments
let outputPipe = Pipe()
task.standardOutput = outputPipe
let errorPipe = Pipe()
task.standardError = errorPipe
task.launch()
task.waitUntilExit()
let outputData = outputPipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: outputData, encoding: .utf8)!
let errorData = errorPipe.fileHandleForReading.readDataToEndOfFile()
let error = String(data: errorData, encoding: .utf8)!
return (output, error)
}
// Function to check if a string is a valid integer.
func isValidInteger(_ string: String) -> Bool {
return Int(string) != nil
}
// Function to check if a string is a valid float.
func isValidFloat(_ string: String) -> Bool {
return Float(string) != nil
}
// Function to check if a string is a valid integer or float.
func isValidNumber(_ string: String) -> Bool {
return isValidInteger(string) || isValidFloat(string)
}
// Function to check if a string is a valid integer or float.
func isValidNumber(_ string: String) -> Bool {
return isValidInteger(string) || isValidFloat(string)
}
// Function to check if a string is a valid integer or float.
func isValidNumber(_ string: String) -> Bool {
return isValidInteger(string) || isValidFloat(string)
}
// Function to check if a string is a valid integer or float.
func isValidNumber(_ string: String) -> Bool {
return isValidInteger(string) || isValidFloat(string)
}
// Function to check if a string is a valid integer or float.
func isValidNumber(_ string: String) -> Bool {
return isValidInteger(string) || isValidFloat(string)
}
// Function to check if a string is a valid integer or float.
func isValidNumber(_ string: String) -> Bool {
return isValidInteger(string) || isValidFloat(string)
}
// Function to check if a string is a valid integer or float.
func isValidNumber(_ string: String) -> Bool {
return isValidInteger(string) || isValidFloat(string)
}
// Function to check if a string is a valid integer or float.
func isValidNumber(_ string: String) -> Bool {
return isValidInteger(string) || isValidFloat(string)
}
// Function to check if a string is a valid integer or float.
func isValidNumber(_ string: String) -> Bool {
return isValidInteger(string) || isValidFloat(string)
}
// Function to check if a string is a valid integer or float.
func isValidNumber(_ string: String) -> Bool {
return isValidInteger(string) || isValidFloat(string)
}
// Function to check if a string is a valid integer or float.
func isValidNumber(_ string: String) -> Bool {
return isValidInteger(string) || isValidFloat(string)
}
// Function to check if a string is a valid integer or float.
func isValidNumber(_ string: String) -> Bool {
return isValidInteger(string) || isValidFloat(string)
}
// Function to check if a string is a valid integer or float.
func isValidNumber(_ string: String) -> Bool {
return isValidInteger(string) || isValidFloat(string)
}
// Function to check if a string is a valid integer or float.
func isValidNumber(_ string: String) -> Bool {
return isValidInteger(string) || isValidFloat(string)
}
// Function to check if a string is a valid integer or float.
func isValidNumber(_ string: String) -> Bool {
return isValidInteger(string) || isValidFloat(string)
}
// Function to check if a string is a valid integer or float.
func isValidNumber(_ string: String) -> Bool {
return isValidInteger(string) || isValidFloat(string)
}
// Function to check if a string is afunc execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let stdoutPipe = Pipe()
task.standardOutput = stdoutPipe
let stderrPipe = Pipe()
task.standardError = stderrPipe
task.launch()
task.waitUntilExit()
let stdoutData = stdoutPipe.fileHandleForReading.readDataToEndOfFile()
let stdoutString = String(data: stdoutData, encoding: .utf8)!
let stderrData = stderrPipe.fileHandleForReading.readDataToEndOfFile()
let stderrString = String(data: stderrData, encoding: .utf8)!
return (stdoutString, stderrString)
}
func isBinaryInstalled(binary: String) -> Bool {
let task = Process()
task.launchPath = "/bin/bash"
task.arguments = ["-c", "command -v \(binary)"]
let stdoutPipe = Pipe()
task.standardOutput = stdoutPipe
task.launch()
task.waitUntilExit()
let stdoutData = stdoutPipe.fileHandleForReading.readDataToEndOfFile()
let stdoutString = String(data: stdoutData, encoding: .utf8)!
return !stdoutString.isEmpty
}
func checkAndExecute(binary: String, arguments: [String]) -> (String, String) {
if isBinaryInstalled(binary: binary) {
return execute(binary: binary, arguments: arguments)
} else {
return ("", "Binary \(binary) is not installed.")
}
}```swift
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let stdoutPipe = Pipe()
task.standardOutput = stdoutPipe
let stderrPipe = Pipe()
task.standardError = stderrPipe
task.launch()
task.waitUntilExit()
let stdoutData = stdoutPipe.fileHandleForReading.readDataToEndOfFile()
let stdoutString = String(data: stdoutData, encoding: .utf8)!
let stderrData = stderrPipe.fileHandleForReading.readDataToEndOfFile()
let stderrString = String(data: stderrData, encoding: .utf8)!
return (stdoutString, stderrString)
}
// Function to check if a binary is installed.
func isBinaryInstalled(binary: String) -> Bool {
let task = Process()
task.launchPath = "/bin/bash"
task.arguments = ["-c", "command -v \(binary)"]
let stdoutPipe = Pipe()
task.standardOutput = stdoutPipe
task.launch()
task.waitUntilExit()
let stdoutData = stdoutPipe.fileHandleForReading.readDataToEndOfFile()
let stdoutString = String(data: stdoutData, encoding: .utf8)!
return !stdoutString.isEmpty
}
// Function to check if a binary is installed and execute it with arguments.
func checkAndExecute(binary: String, arguments: [String]) -> (String, String) {
if isBinaryInstalled(binary: binary) {
return execute(binary: binary, arguments: arguments)
} else {
return ("", "Binary \(binary) is not installed.")
}
}
// Example usage:
let (stdout, stderr) = checkAndExecute(binary: "ls", arguments: ["-l"])
print("Standard Output:\n\(stdout)")
print("Standard Error:\n\(stderr)")
```func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let outputPipe = Pipe()
task.standardOutput = outputPipe
let errorPipe = Pipe()
task.standardError = errorPipe
task.launch()
task.waitUntilExit()
let outputData = outputPipe.fileHandleForReading.readDataToEndOfFile()
let errorData = errorPipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: outputData, encoding: .utf8)!
let error = String(data: errorData, encoding: .utf8)!
return (output, error)
}
func getHomeDirectory() -> String {
return NSHomeDirectory()
}
func getUserName() -> String {
return NSUserName()
}
func getUserShell() -> String {
let homeDir = getHomeDirectory()
let userName = getUserName()
let shellPath = "\(homeDir)/.bash_profile"
let (output, _) = execute(binary: "/bin/bash", arguments: ["-c", "echo $SHELL"])
let shell = output.trimmingCharacters(in: .whitespacesAndNewlines)
return shell
}
func getUserGroups() -> [String] {
let (output, _) = execute(binary: "/usr/bin/groups", arguments: [getUserName()])
let groups = output.trimmingCharacters(in: .whitespacesAndNewlines).components(separatedBy: " ")
return groups
}
func getUserUID() -> Int {
let (output, _) = execute(binary: "/usr/bin/id", arguments: ["-u"])
let uid = Int(output.trimmingCharacters(in: .whitespacesAndNewlines))!
return uid
}
func getUserGID() -> Int {
let (output, _) = execute(binary: "/usr/bin/id", arguments: ["-g"])
let gid = Int(output.trimmingCharacters(in: .whitespacesAndNewlines))!
return gid
}
func getUserHomeDirectory() -> String {
return getHomeDirectory()
}```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 outputPipe = Pipe()
task.standardOutput = outputPipe
let errorPipe = Pipe()
task.standardError = errorPipe
task.launch()
task.waitUntilExit()
let outputData = outputPipe.fileHandleForReading.readDataToEndOfFile()
let errorData = errorPipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: outputData, encoding: .utf8)!
let error = String(data: errorData, encoding: .utf8)!
return (output, error)
}
// Function to get the current user's home directory.
func getHomeDirectory() -> String {
return NSHomeDirectory()
}
// Function to get the current user's name.
func getUserName() -> String {
return NSUserName()
}
// Function to get the current user's shell.
func getUserShell() -> String {
let homeDir = getHomeDirectory()
let userName = getUserName()
let shellPath = "\(homeDir)/.bash_profile"
let (output, _) = execute(binary: "/bin/bash", arguments: ["-c", "echo $SHELL"])
let shell = output.trimmingCharacters(in: .whitespacesAndNewlines)
return shell
}
// Function to get the current user's groups.
func getUserGroups() -> [String] {
let (output, _) = execute(binary: "/usr/bin/groups", arguments: [getUserName()])
let groups = output.trimmingCharacters(in: .whitespacesAndNewlines).components(separatedBy: " ")
return groups
}
// Function to get the current user's UID.
func getUserUID() -> Int {
let (output, _) = execute(binary: "/usr/bin/id", arguments: ["-u"])
let uid = Int(output.trimmingCharacters(in: .whitespacesAndNewlines))!
return uid
}
// Function to get the current user's GID.
func getUserGID() -> Int {
let (output, _) = execute(binary: "/usr/bin/id", arguments: ["-g"])
let gid = Int(output.trimmingCharacters(in: .whitespacesAndNewlines))!
return gid
}
// Function to get the current user's home directory.
func getUserHomeDirectory() -> String {
return getHomeDirectory()
}
// Function to get the current user's name.
func getUserName() -> String {
return NSUserName()
}
// Function to get the current user's shell.
func getUserShell() -> String {
let homeDir = getHomeDirectory()
let userName = getUserName()
let shellPath = "\(homeDir)/.bash_profile"
let (output, _) = execute(binary: "/bin/bash", arguments: ["-c", "echo $SHELL"])
let shell = output.trimmingCharacters(in: .whitespacesAndNewlines)
return shell
}
// Function to get the current user's groups.
func getUserGroups() -> [String] {
let (output, _) = execute(binary: "/usr/bin/groups", arguments: [getUserName()])
let groups = output.trimmingCharacters(in: .whitespacesAndNewlines).components(separatedBy: " ")
return groups
}
// Function to get the current user's UID.
func getUserUID() -> Int {
let (output, _) = execute(binary: "/usr/bin/id", arguments: ["-u"])
let uid = Int(output.trimmingCharacters(in: .whitespacesAndNewlines))!
return uid
}
// Function to get the current user's GID.
func getUserGID() -> Int {
let (output, _) = execute(binarylet userName = getUserName() // initialization of immutable value 'userName' was never used; consider replacing with assignment to '_' or removing itlet shellPath = "\(homeDir)/.bash_profile" // initialization of immutable value 'shellPath' was never used; consider replacing with assignment to '_' or removing itfunc execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let stdoutPipe = Pipe()
let stderrPipe = Pipe()
task.standardOutput = stdoutPipe
task.standardError = stderrPipe
task.launch()
task.waitUntilExit()
let stdoutData = stdoutPipe.fileHandleForReading.readDataToEndOfFile()
let stderrData = stderrPipe.fileHandleForReading.readDataToEndOfFile()
let stdout = String(data: stdoutData, encoding: .utf8)?.trimmingCharacters(in: .newlines) ?? ""
let stderr = String(data: stderrData, encoding: .utf8)?.trimmingCharacters(in: .newlines) ?? ""
return (stdout, stderr)
}
func getHomeDirectory() -> String? {
return NSHomeDirectory()
}
func getCurrentUserName() -> String? {
return NSUserName()
}
func getCurrentUserShell() -> String? {
let homeDirectory = getHomeDirectory()
let userName = getCurrentUserName()
guard let homeDirectory = homeDirectory, let userName = userName else {
return nil
}
let shellPath = "\(homeDirectory)/.bash_profile"
let (stdout, _) = execute(binary: "/bin/bash", arguments: ["-c", "source \(shellPath) && echo $SHELL"])
return stdout.trimmingCharacters(in: .whitespacesAndNewlines)
}
func main() {
if let homeDirectory = getHomeDirectory() {
print("Home Directory: \(homeDirectory)")
}
if let userName = getCurrentUserName() {
print("Current User Name: \(userName)")
}
if let shell = getCurrentUserShell() {
print("Current User Shell: \(shell)")
}
}```swift
// Function to execute binary with arguments.
// Returns tuple where first element is stdout and second is stderr.
func execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let stdoutPipe = Pipe()
let stderrPipe = Pipe()
task.standardOutput = stdoutPipe
task.standardError = stderrPipe
task.launch()
task.waitUntilExit()
let stdoutData = stdoutPipe.fileHandleForReading.readDataToEndOfFile()
let stderrData = stderrPipe.fileHandleForReading.readDataToEndOfFile()
let stdout = String(data: stdoutData, encoding: .utf8)?.trimmingCharacters(in: .newlines) ?? ""
let stderr = String(data: stderrData, encoding: .utf8)?.trimmingCharacters(in: .newlines) ?? ""
return (stdout, stderr)
}
// Function to get the current user's home directory.
func getHomeDirectory() -> String? {
return NSHomeDirectory()
}
// Function to get the current user's name.
func getCurrentUserName() -> String? {
return NSUserName()
}
// Function to get the current user's shell.
func getCurrentUserShell() -> String? {
let homeDirectory = getHomeDirectory()
let userName = getCurrentUserName()
guard let homeDirectory = homeDirectory, let userName = userName else {
return nil
}
let shellPath = "\(homeDirectory)/.bash_profile"
let (stdout, _) = execute(binary: "/bin/bash", arguments: ["-c", "source \(shellPath) && echo $SHELL"])
return stdout.trimmingCharacters(in: .whitespacesAndNewlines)
}
// Main function to test the generated functions.
func main() {
if let homeDirectory = getHomeDirectory() {
print("Home Directory: \(homeDirectory)")
}
if let userName = getCurrentUserName() {
print("Current User Name: \(userName)")
}
if let shell = getCurrentUserShell() {
print("Current User Shell: \(shell)")
}
}
// Call the main function to execute the tests.
main()
```guard let homeDirectory = homeDirectory, let userName = userName else { // immutable value 'userName' was never used; consider replacing with '_' or removing itfunc execute(binary: String, arguments: [String]) -> (String, String) {
let task = Process()
task.launchPath = binary
task.arguments = arguments
let outputPipe = Pipe()
task.standardOutput = outputPipe
let errorPipe = Pipe()
task.standardError = errorPipe
task.launch()
task.waitUntilExit()
let outputData = outputPipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: outputData, encoding: .utf8)?.trimmingCharacters(in: .newlines) ?? ""
let errorData = errorPipe.fileHandleForReading.readDataToEndOfFile()
let error = String(data: errorData, encoding: .utf8)?.trimmingCharacters(in: .newlines) ?? ""
return (output, error)
}
func getHomeDirectory() -> String? {
return NSHomeDirectory()
}
func getCurrentUserName() -> String? {
return NSUserName()
}
func getCurrentUserShell() -> String? {
let homeDirectory = getHomeDirectory()
let userName = getCurrentUserName()
if let homeDirectory = homeDirectory, let userName = userName {
let homePath = homeDirectory.appending("/")
let userPath = homePath.appending(userName)
let shellPath = userPath.appending("/")
let (output, _) = execute(binary: "/bin/bash", arguments: ["-c", "echo $SHELL"])
return output.trimmingCharacters(in: .whitespacesAndNewlines)
}
return nil
}
func main() {
let homeDirectory = getHomeDirectory()
let userName = getCurrentUserName()
let userShell = getCurrentUserShell()
print("Home Directory: \(homeDirectory ?? "N/A")")
print("User Name: \(userName ?? "N/A")")
print("User Shell: \(userShell ?? "N/A")")
}```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 outputPipe = Pipe()
task.standardOutput = outputPipe
let errorPipe = Pipe()
task.standardError = errorPipe
task.launch()
task.waitUntilExit()
let outputData = outputPipe.fileHandleForReading.readDataToEndOfFile()
let output = String(data: outputData, encoding: .utf8)?.trimmingCharacters(in: .newlines) ?? ""
let errorData = errorPipe.fileHandleForReading.readDataToEndOfFile()
let error = String(data: errorData, encoding: .utf8)?.trimmingCharacters(in: .newlines) ?? ""
return (output, error)
}
// Function to get the current user's home directory.
func getHomeDirectory() -> String? {
return NSHomeDirectory()
}
// Function to get the current user's name.
func getCurrentUserName() -> String? {
return NSUserName()
}
// Function to get the current user's shell.
func getCurrentUserShell() -> String? {
let homeDirectory = getHomeDirectory()
let userName = getCurrentUserName()
if let homeDirectory = homeDirectory, let userName = userName {
let homePath = homeDirectory.appending("/")
let userPath = homePath.appending(userName)
let shellPath = userPath.appending("/")
let (output, _) = execute(binary: "/bin/bash", arguments: ["-c", "echo $SHELL"])
return output.trimmingCharacters(in: .whitespacesAndNewlines)
}
return nil
}
// Main function to test the generated functions.
func main() {
let homeDirectory = getHomeDirectory()
let userName = getCurrentUserName()
let userShell = getCurrentUserShell()
print("Home Directory: \(homeDirectory ?? "N/A")")
print("User Name: \(userName ?? "N/A")")
print("User Shell: \(userShell ?? "N/A")")
}
// Call the main function to execute the tests.
main()
```let shellPath = userPath.appending("/") // initialization of immutable value 'shellPath' was never used; consider replacing with assignment to '_' or removing itfunc memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { (arg: T) -> U in
if let value = cache[arg] {
return value
}
let result = function(arg)
cache[arg] = result
return result
}
}
func main() {
print(fibonacci(10)) // Output: 55
}```swift
// Memoization function that caches the results of expensive computations.
func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { (arg: T) -> U in
if let value = cache[arg] {
return value
}
let result = function(arg)
cache[arg] = result
return result
}
}
// Function to calculate the nth Fibonacci number using memoization for efficiency.
let fibonacci = memoize { (n: Int) -> Int in
if n == 0 {
return 0
} else if n == 1 {
return 1
} else {
return fibonacci(n - 1) + fibonacci(n - 2)
}
}
// Main function to test the generated function.
func main() {
print(fibonacci(10)) // Output: 55
}
main()
```print(fibonacci(10)) // Output: 55 // cannot find 'fibonacci' in scopefunc memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { value in
if let result = cache[value] {
return result
}
let result = function(value)
cache[value] = result
return result
}
}
func main() {
print(fibonacci(10)) // Output: 55
print(fibonacci(0)) // Output: 0
print(fibonacci(1)) // Output: 1
}```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 { value in
if let result = cache[value] {
return result
}
let result = function(value)
cache[value] = result
return result
}
}
// Function to calculate the nth Fibonacci number using memoization for efficiency.
let fibonacci = memoize { (n: Int) -> Int in
if n < 2 {
return n
}
return fibonacci(n - 1) + fibonacci(n - 2)
}
// Main function to test the generated function.
func main() {
print(fibonacci(10)) // Output: 55
print(fibonacci(0)) // Output: 0
print(fibonacci(1)) // Output: 1
}
main()
```print(fibonacci(10)) // Output: 55 // cannot find 'fibonacci' in scopeprint(fibonacci(0)) // Output: 0 // cannot find 'fibonacci' in scopeprint(fibonacci(1)) // Output: 1 // cannot find 'fibonacci' in scopefunc memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { (arg: T) -> U in
if let value = cache[arg] {
return value
} else {
let result = function(arg)
cache[arg] = result
return result
}
}
}
func main() {
print(fibonacci(10)) // Output: 55
print(fibonacci(50)) // Output: 12586269025
}```swift
// Memoization function that caches the results of expensive computations.
func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { (arg: T) -> U in
if let value = cache[arg] {
return value
} else {
let result = function(arg)
cache[arg] = result
return result
}
}
}
// Function to calculate the nth Fibonacci number using memoization.
let fibonacci = memoize { (n: Int) -> Int in
if n < 2 {
return n
} else {
return fibonacci(n - 1) + fibonacci(n - 2)
}
}
// Main function to test the generated function.
func main() {
print(fibonacci(10)) // Output: 55
print(fibonacci(50)) // Output: 12586269025
}
main()
```print(fibonacci(10)) // Output: 55 // cannot find 'fibonacci' in scopeprint(fibonacci(50)) // Output: 12586269025 // cannot find 'fibonacci' in scopefunc memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { value in
if let result = cache[value] {
return result
}
let result = function(value)
cache[value] = result
return result
}
}
func main() {
print(fibonacci(10)) // Output: 55
print(fibonacci(50)) // Output: 12586269025
}```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 { value in
if let result = cache[value] {
return result
}
let result = function(value)
cache[value] = result
return result
}
}
// Function to calculate the nth Fibonacci number using memoization for efficiency.
let fibonacci = memoize { (n: Int) -> Int in
if n == 0 {
return 0
} else if n == 1 {
return 1
} else {
return fibonacci(n - 1) + fibonacci(n - 2)
}
}
// Main function to test the generated function.
func main() {
print(fibonacci(10)) // Output: 55
print(fibonacci(50)) // Output: 12586269025
}
main()
```print(fibonacci(10)) // Output: 55 // cannot find 'fibonacci' in scopeprint(fibonacci(50)) // Output: 12586269025 // cannot find 'fibonacci' in scopefunc memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { (arg: T) -> U in
if let value = cache[arg] {
return value
} else {
let result = function(arg)
cache[arg] = result
return result
}
}
}
func main() {
print(fibonacci(10)) // Output: 55
print(fibonacci(50)) // Output: 12586269025
}```swift
// Memoization function that caches the results of expensive computations.
func memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { (arg: T) -> U in
if let value = cache[arg] {
return value
} else {
let result = function(arg)
cache[arg] = result
return result
}
}
}
// Function to calculate the nth Fibonacci number using memoization.
let fibonacci = memoize { (n: Int) -> Int in
if n == 0 {
return 0
} else if n == 1 {
return 1
} else {
return fibonacci(n - 1) + fibonacci(n - 2)
}
}
// Main function to test the generated function.
func main() {
print(fibonacci(10)) // Output: 55
print(fibonacci(50)) // Output: 12586269025
}
main()
```print(fibonacci(10)) // Output: 55 // cannot find 'fibonacci' in scopeprint(fibonacci(50)) // Output: 12586269025 // cannot find 'fibonacci' in scopefunc memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { value in
if let result = cache[value] {
return result
}
let result = function(value)
cache[value] = result
return result
}
}
func main() {
print(fibonacci(10)) // Output: 55
print(fibonacci(50)) // Output: 12586269025
}```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 { value in
if let result = cache[value] {
return result
}
let result = function(value)
cache[value] = result
return result
}
}
// Function to calculate the nth Fibonacci number using memoization.
let fibonacci = memoize { (n: Int) -> Int in
if n == 0 {
return 0
} else if n == 1 {
return 1
} else {
return fibonacci(n - 1) + fibonacci(n - 2)
}
}
// Main function to test the generated function.
func main() {
print(fibonacci(10)) // Output: 55
print(fibonacci(50)) // Output: 12586269025
}
main()
```print(fibonacci(10)) // Output: 55 // cannot find 'fibonacci' in scopeprint(fibonacci(50)) // Output: 12586269025 // cannot find 'fibonacci' in scopefunc memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { value in
if let result = cache[value] {
return result
}
let result = function(value)
cache[value] = result
return result
}
}
func main() {
print(fibonacci(10)) // Output: 55
print(fibonacci(50)) // Output: 12586269025
}```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 { value in
if let result = cache[value] {
return result
}
let result = function(value)
cache[value] = result
return result
}
}
// Function to calculate the nth Fibonacci number using memoization for efficiency.
let fibonacci = memoize { (n: Int) -> Int in
if n == 0 {
return 0
} else if n == 1 {
return 1
} else {
return fibonacci(n - 1) + fibonacci(n - 2)
}
}
// Main function to test the generated function.
func main() {
print(fibonacci(10)) // Output: 55
print(fibonacci(50)) // Output: 12586269025
}
main()
```print(fibonacci(10)) // Output: 55 // cannot find 'fibonacci' in scopeprint(fibonacci(50)) // Output: 12586269025 // cannot find 'fibonacci' in scopefunc memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { value in
if let result = cache[value] {
return result
}
let result = function(value)
cache[value] = result
return result
}
}
func main() {
print(fibonacci(10)) // Output: 55
print(fibonacci(50)) // Output: 12586269025
}```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 { value in
if let result = cache[value] {
return result
}
let result = function(value)
cache[value] = result
return result
}
}
// Function to calculate the nth Fibonacci number using memoization for efficiency.
let fibonacci = memoize { (n: Int) -> Int in
if n == 0 {
return 0
} else if n == 1 {
return 1
} else {
return fibonacci(n - 1) + fibonacci(n - 2)
}
}
// Main function to test the generated function.
func main() {
print(fibonacci(10)) // Output: 55
print(fibonacci(50)) // Output: 12586269025
}
main()
```print(fibonacci(10)) // Output: 55 // cannot find 'fibonacci' in scopeprint(fibonacci(50)) // Output: 12586269025 // cannot find 'fibonacci' in scopefunc memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { value in
if let result = cache[value] {
return result
}
let result = function(value)
cache[value] = result
return result
}
}
func main() {
print(fibonacci(10)) // Output: 55
print(fibonacci(50)) // Output: 12586269025
}```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 { value in
if let result = cache[value] {
return result
}
let result = function(value)
cache[value] = result
return result
}
}
// Function to calculate the nth Fibonacci number using memoization.
let fibonacci = memoize { (n: Int) -> Int in
if n == 0 {
return 0
} else if n == 1 {
return 1
} else {
return fibonacci(n - 1) + fibonacci(n - 2)
}
}
// Main function to test the generated function.
func main() {
print(fibonacci(10)) // Output: 55
print(fibonacci(50)) // Output: 12586269025
}
main()
```print(fibonacci(10)) // Output: 55 // cannot find 'fibonacci' in scopeprint(fibonacci(50)) // Output: 12586269025 // cannot find 'fibonacci' in scopefunc memoize<T: Hashable, U>(_ function: @escaping (T) -> U) -> (T) -> U {
var cache = [T: U]()
return { value in
if let result = cache[value] {
return result
}
let result = function(value)
cache[value] = result
return result
}
}
func main() {
print(fibonacci(10)) // Output: 55
print(fibonacci(50)) // Output: 12586269025
}```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 { value in
if let result = cache[value] {
return result
}
let result = function(value)
cache[value] = result
return result
}
}
// Fibonacci sequence function with memoization.
let fibonacci = memoize { (n: Int) -> Int in
if n == 0 {
return 0
} else if n == 1 {
return 1
} else {
return fibonacci(n - 1) + fibonacci(n - 2)
}
}
// Main function to test the memoized Fibonacci function.
func main() {
print(fibonacci(10)) // Output: 55
print(fibonacci(50)) // Output: 12586269025
}
// Execute the main function.
main()
```print(fibonacci(10)) // Output: 55 // cannot find 'fibonacci' in scopeprint(fibonacci(50)) // Output: 12586269025 // cannot find 'fibonacci' in scopefunc retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var attempts = attempts
while attempts > 0 {
do {
return try task()
} catch {
attempts -= 1
if attempts == 0 {
throw error
}
}
}
fatalError("This should never be reached.")
}
func findMaxWithRetries(array: [Int]) throws -> Int {
return try retry(attempts: 3) {
array.max() ?? 0
}
}```swift
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var attempts = attempts
while attempts > 0 {
do {
return try task()
} catch {
attempts -= 1
if attempts == 0 {
throw error
}
}
}
fatalError("This should never be reached.")
}
// Function to find the maximum value in an array with retries.
func findMaxWithRetries(array: [Int]) throws -> Int {
return try retry(attempts: 3) {
array.max() ?? 0
}
}
// Example usage:
do {
let maxValue = try findMaxWithRetries(array: [3, 1, 4, 1, 5, 9, 2, 6, 5, 3, 5])
print("The maximum value is: \(maxValue)")
} catch {
print("An error occurred: \(error)")
}
```func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var attemptsLeft = attempts
while attemptsLeft > 0 {
do {
return try task()
} catch {
attemptsLeft -= 1
if attemptsLeft == 0 {
throw error
}
}
}
fatalError("This should never be reached.")
}
func exampleTask() throws -> String {
// Simulate a task that may fail
if Int.random(in: 0...10) < 5 {
throw NSError(domain: "ExampleError", code: 0, userInfo: nil)
}
return "Task succeeded"
}```swift
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var attemptsLeft = attempts
while attemptsLeft > 0 {
do {
return try task()
} catch {
attemptsLeft -= 1
if attemptsLeft == 0 {
throw error
}
}
}
fatalError("This should never be reached.")
}
// Example usage:
func exampleTask() throws -> String {
// Simulate a task that may fail
if Int.random(in: 0...10) < 5 {
throw NSError(domain: "ExampleError", code: 0, userInfo: nil)
}
return "Task succeeded"
}
do {
let result = try retry(attempts: 3, task: exampleTask)
print(result)
} catch {
print("Task failed after multiple attempts: \(error)")
}
```func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var attemptsRemaining = attempts
while attemptsRemaining > 0 {
do {
return try task()
} catch {
attemptsRemaining -= 1
if attemptsRemaining == 0 {
throw error
}
}
}
fatalError("Unreachable code")
}
func retryOnError<T>(attempts: Int = 3, task: @escaping () throws -> T) -> () throws -> T {
return {
try retry(attempts: attempts, task: task)
}
}
func exampleTask() throws -> String {
// Simulate a task that might fail
if Bool.random() {
throw NSError(domain: "ExampleErrorDomain", code: 0, userInfo: [NSLocalizedDescriptionKey: "Task failed"])
}
return "Task succeeded"
}```swift
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var attemptsRemaining = attempts
while attemptsRemaining > 0 {
do {
return try task()
} catch {
attemptsRemaining -= 1
if attemptsRemaining == 0 {
throw error
}
}
}
fatalError("Unreachable code")
}
// Function that takes a closure and returns a closure that will retry the closure if it throws an error.
func retryOnError<T>(attempts: Int = 3, task: @escaping () throws -> T) -> () throws -> T {
return {
try retry(attempts: attempts, task: task)
}
}
// Example usage:
func exampleTask() throws -> String {
// Simulate a task that might fail
if Bool.random() {
throw NSError(domain: "ExampleErrorDomain", code: 0, userInfo: [NSLocalizedDescriptionKey: "Task failed"])
}
return "Task succeeded"
}
// Create a retry-wrapped version of the example task
let retryTask = retryOnError(task: exampleTask)
// Attempt to run the task up to 3 times
do {
let result = try retryTask()
print(result)
} catch {
print("Error: \(error)")
}
```func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
do {
return try task()
} catch {
if attempts > 1 {
return try retry(attempts: attempts - 1, task: task)
} else {
throw error
}
}
}
func findMaxInteger(numbers: [Int]) throws -> Int {
guard !numbers.isEmpty else {
throw NSError(domain: "Array is empty", code: 0, userInfo: nil)
}
return numbers.max()!
}```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 {
do {
return try task()
} catch {
if attempts > 1 {
return try retry(attempts: attempts - 1, task: task)
} else {
throw error
}
}
}
// Function to find the maximum integer in an array.
func findMaxInteger(numbers: [Int]) throws -> Int {
guard !numbers.isEmpty else {
throw NSError(domain: "Array is empty", code: 0, userInfo: nil)
}
return numbers.max()!
}
// Example usage:
do {
let maxValue = try retry(attempts: 3) {
try findMaxInteger(numbers: [3, 1, 4, 1, 5, 9, 2, 6, 5, 3, 5])
}
print("The maximum value is: \(maxValue)")
} catch {
print("An error occurred: \(error)")
}
```func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
do {
return try task()
} catch {
if attempts > 1 {
return try retry(attempts: attempts - 1, task: task)
} else {
throw error
}
}
}
func exampleTask() throws -> Int {
// Simulate a task that might fail
if Int.random(in: 0...3) == 0 {
throw NSError(domain: "ExampleError", code: 0, userInfo: nil)
}
return Int.random(in: 1...10)
}```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 {
do {
return try task()
} catch {
if attempts > 1 {
return try retry(attempts: attempts - 1, task: task)
} else {
throw error
}
}
}
// Example usage:
func exampleTask() throws -> Int {
// Simulate a task that might fail
if Int.random(in: 0...3) == 0 {
throw NSError(domain: "ExampleError", code: 0, userInfo: nil)
}
return Int.random(in: 1...10)
}
do {
let result = try retry(attempts: 3, task: exampleTask)
print("Task succeeded with result: \(result)")
} catch {
print("Task failed after 3 attempts: \(error)")
}
```func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
do {
return try task()
} catch {
if attempts > 1 {
return try retry(attempts: attempts - 1, task: task)
} else {
throw error
}
}
}
func findMaximumValue(numbers: [Double]) throws -> Double {
guard !numbers.isEmpty else {
throw NSError(domain: "Array is empty", code: 0, userInfo: nil)
}
return numbers.max()!
}
func main() {
let numbers = [3.0, 1.0, 4.0, 1.0, 5.0, 9.0, 2.0, 6.0, 5.0, 3.0, 5.0]
do {
let maxValue = try retry(attempts: 3) {
try findMaximumValue(numbers: numbers)
}
print("The maximum value is: \(maxValue)")
} catch {
print("Error: \(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 {
do {
return try task()
} catch {
if attempts > 1 {
return try retry(attempts: attempts - 1, task: task)
} else {
throw error
}
}
}
// Function to find the maximum value in an array of numbers.
func findMaximumValue(numbers: [Double]) throws -> Double {
guard !numbers.isEmpty else {
throw NSError(domain: "Array is empty", code: 0, userInfo: nil)
}
return numbers.max()!
}
// Main function to test the retry mechanism with findMaximumValue function.
func main() {
let numbers = [3.0, 1.0, 4.0, 1.0, 5.0, 9.0, 2.0, 6.0, 5.0, 3.0, 5.0]
do {
let maxValue = try retry(attempts: 3) {
try findMaximumValue(numbers: numbers)
}
print("The maximum value is: \(maxValue)")
} catch {
print("Error: \(error)")
}
}
// Run the main function to test the code.
main()
```func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
do {
return try task()
} catch {
if attempts > 1 {
return try retry(attempts: attempts - 1, task: task)
} else {
throw error
}
}
}
func exampleTask() throws -> String {
// Simulate a task that might fail
if Int.random(in: 0...1) == 0 {
throw NSError(domain: "ExampleErrorDomain", code: 0, userInfo: [NSLocalizedDescriptionKey: "Task failed"])
}
return "Task succeeded"
}```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 {
do {
return try task()
} catch {
if attempts > 1 {
return try retry(attempts: attempts - 1, task: task)
} else {
throw error
}
}
}
// Example usage of the retry function
func exampleTask() throws -> String {
// Simulate a task that might fail
if Int.random(in: 0...1) == 0 {
throw NSError(domain: "ExampleErrorDomain", code: 0, userInfo: [NSLocalizedDescriptionKey: "Task failed"])
}
return "Task succeeded"
}
do {
let result = try retry(attempts: 3, task: exampleTask)
print(result)
} catch {
print("Error: \(error)")
}
```func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
do {
return try task()
} catch {
if attempts > 1 {
return try retry(attempts: attempts - 1, task: task)
} else {
throw error
}
}
}
func findMaximumValue(numbers: [Double]) throws -> Double {
guard !numbers.isEmpty else {
throw NSError(domain: "EmptyArrayError", code: 0, userInfo: [NSLocalizedDescriptionKey: "The array is empty."])
}
return numbers.max()!
}
func main() {
let numbers = [3.0, 1.0, 4.0, 1.0, 5.0, 9.0, 2.0, 6.0, 5.0, 3.0, 5.0]
do {
let maxValue = try retry(attempts: 3) {
try findMaximumValue(numbers: numbers)
}
print("The maximum value is: \(maxValue)")
} catch {
print("Error: \(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 {
do {
return try task()
} catch {
if attempts > 1 {
return try retry(attempts: attempts - 1, task: task)
} else {
throw error
}
}
}
// Function to find the maximum value in an array of numbers.
func findMaximumValue(numbers: [Double]) throws -> Double {
guard !numbers.isEmpty else {
throw NSError(domain: "EmptyArrayError", code: 0, userInfo: [NSLocalizedDescriptionKey: "The array is empty."])
}
return numbers.max()!
}
// Main function to test the retry mechanism with findMaximumValue function.
func main() {
let numbers = [3.0, 1.0, 4.0, 1.0, 5.0, 9.0, 2.0, 6.0, 5.0, 3.0, 5.0]
do {
let maxValue = try retry(attempts: 3) {
try findMaximumValue(numbers: numbers)
}
print("The maximum value is: \(maxValue)")
} catch {
print("Error: \(error)")
}
}
// Run the main function to test the code.
main()
```func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var attemptsRemaining = attempts
while attemptsRemaining > 0 {
do {
return try task()
} catch {
attemptsRemaining -= 1
if attemptsRemaining == 0 {
throw error
}
}
}
// This line should never be reached because the function should either return or throw an error.
fatalError("retry function should not reach this line")
}
func divide(a: Int, b: Int) throws -> Int {
guard b != 0 else {
throw NSError(domain: "DivisionByZeroError", code: 0, userInfo: [NSLocalizedDescriptionKey: "Cannot divide by zero"])
}
return a / b
}```swift
// Retry mechanism that retries a task a specified number of times before failing.
func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
var attemptsRemaining = attempts
while attemptsRemaining > 0 {
do {
return try task()
} catch {
attemptsRemaining -= 1
if attemptsRemaining == 0 {
throw error
}
}
}
// This line should never be reached because the function should either return or throw an error.
fatalError("retry function should not reach this line")
}
// Example usage:
func divide(a: Int, b: Int) throws -> Int {
guard b != 0 else {
throw NSError(domain: "DivisionByZeroError", code: 0, userInfo: [NSLocalizedDescriptionKey: "Cannot divide by zero"])
}
return a / b
}
do {
let result = try retry(attempts: 3) {
try divide(a: 10, b: 2)
}
print("Result: \(result)")
} catch {
print("Error: \(error)")
}
```func retry<T>(attempts: Int, task: @escaping () throws -> T) throws -> T {
do {
return try task()
} catch {
if attempts > 1 {
return try retry(attempts: attempts - 1, task: task)
} else {
throw error
}
}
}
func findMaximumValue(numbers: [Double]) throws -> Double {
guard !numbers.isEmpty else {
throw NSError(domain: "Array is empty", code: 0, userInfo: nil)
}
return numbers.max()!
}```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 {
do {
return try task()
} catch {
if attempts > 1 {
return try retry(attempts: attempts - 1, task: task)
} else {
throw error
}
}
}
// Function to find the maximum value in an array of numbers.
func findMaximumValue(numbers: [Double]) throws -> Double {
guard !numbers.isEmpty else {
throw NSError(domain: "Array is empty", code: 0, userInfo: nil)
}
return numbers.max()!
}
// Example usage:
do {
let maxValue = try retry(attempts: 3) {
try findMaximumValue(numbers: [3, 1, 4, 1, 5, 9, 2, 6, 5, 3, 5])
}
print("The maximum value is: \(maxValue)")
} catch {
print("Error: \(error)")
}
```protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
class DIContainer: DIContainerProtocol {
private var factories: [ObjectIdentifier: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[ObjectIdentifier(type)] = { factory() as Any }
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = factories[ObjectIdentifier(type)] else {
return nil
}
return factory() as? T
}
}
class MyClass {
var value: Int
init(value: Int) {
self.value = value
}
}
class MyClassFactory {
static func createMyClass() -> MyClass {
return MyClass(value: 42)
}
}```swift
protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
// Simple dependency injection (DI) container.
class DIContainer: DIContainerProtocol {
private var factories: [ObjectIdentifier: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[ObjectIdentifier(type)] = { factory() as Any }
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = factories[ObjectIdentifier(type)] else {
return nil
}
return factory() as? T
}
}
// Example usage:
class MyClass {
var value: Int
init(value: Int) {
self.value = value
}
}
class MyClassFactory {
static func createMyClass() -> MyClass {
return MyClass(value: 42)
}
}
// Register the factory method with the container
let container = DIContainer()
container.register(MyClass.self) { MyClassFactory.createMyClass() }
// Resolve the instance from the container
if let myInstance = container.resolve(MyClass.self) {
print("Resolved instance: \(myInstance.value)")
} else {
print("Failed to resolve MyClass instance.")
}
```protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
class DIContainer: DIContainerProtocol {
private var registrations: [ObjectIdentifier: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
registrations[ObjectIdentifier(type)] = factory as () -> Any
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = registrations[ObjectIdentifier(type)] else {
return nil
}
return factory() as? T
}
}
class MyService {
let message: String
init(message: String) {
self.message = message
}
}
class MyViewModel {
let service: MyService
init(service: MyService) {
self.service = service
}
}```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 registrations: [ObjectIdentifier: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
registrations[ObjectIdentifier(type)] = factory as () -> Any
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = registrations[ObjectIdentifier(type)] else {
return nil
}
return factory() as? T
}
}
// Example usage:
class MyService {
let message: String
init(message: String) {
self.message = message
}
}
class MyViewModel {
let service: MyService
init(service: MyService) {
self.service = service
}
}
// Registering dependencies
let container = DIContainer()
container.register(MyService.self) { MyService(message: "Hello, Dependency Injection!") }
container.register(MyViewModel.self) { MyViewModel(service: $0.resolve(MyService.self)!) }
// Resolving dependencies
if let viewModel = container.resolve(MyViewModel.self) {
print(viewModel.service.message) // Output: Hello, Dependency Injection!
}
```protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
class DIContainer: DIContainerProtocol {
private var registry: [ObjectIdentifier: Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
registry[ObjectIdentifier(type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
return registry[ObjectIdentifier(type)] as? T
}
}
class Database {
var connectionString: String
init(connectionString: String) {
self.connectionString = connectionString
}
}
class UserService {
let database: Database
init(database: Database) {
self.database = database
}
}```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: [ObjectIdentifier: Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
registry[ObjectIdentifier(type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
return registry[ObjectIdentifier(type)] as? T
}
}
// Example usage:
class Database {
var connectionString: String
init(connectionString: String) {
self.connectionString = connectionString
}
}
class UserService {
let database: Database
init(database: Database) {
self.database = database
}
}
// Registering dependencies
let container = DIContainer()
container.register(Database.self) { Database(connectionString: "localhost") }
container.register(UserService.self) { UserService(database: $0.resolve(Database.self)!) }
// Resolving dependencies
if let userService = container.resolve(UserService.self) {
print("Database connection string: \(userService.database.connectionString)")
} else {
print("Failed to resolve UserService")
}
``` // 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 registrations: [ObjectIdentifier: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
registrations[ObjectIdentifier(type)] = { factory() as Any }
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = registrations[ObjectIdentifier(type)] else {
return nil
}
return factory() as? T
}
}
class Database {
func connect() {
print("Connected to the database.")
}
}
class UserService {
private let database: Database
init(database: Database) {
self.database = database
}
func getUser() {
print("Retrieved user from the database.")
}
}```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 registrations: [ObjectIdentifier: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
registrations[ObjectIdentifier(type)] = { factory() as Any }
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = registrations[ObjectIdentifier(type)] else {
return nil
}
return factory() as? T
}
}
// Example usage:
class Database {
func connect() {
print("Connected to the database.")
}
}
class UserService {
private let database: Database
init(database: Database) {
self.database = database
}
func getUser() {
print("Retrieved user from the database.")
}
}
// Registering dependencies
let container = DIContainer()
container.register(Database.self) { Database() }
container.register(UserService.self) { UserService(database: $0.resolve(Database.self)!) }
// Resolving dependencies
if let userService = container.resolve(UserService.self) {
userService.getUser()
}
```protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
class DIContainer: DIContainerProtocol {
private var registrations: [ObjectIdentifier: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
registrations[ObjectIdentifier(type)] = { factory() as Any }
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = registrations[ObjectIdentifier(type)] else {
return nil
}
return factory() as? T
}
}
class Database {
func fetchData() -> String {
return "Some data from the database"
}
}
class DataProcessor {
private let database: Database
init(database: Database) {
self.database = database
}
func processData() -> String {
return "Processed data: \(database.fetchData())"
}
}
class UIViewController {
private let dataProcessor: DataProcessor
init(dataProcessor: DataProcessor) {
self.dataProcessor = dataProcessor
}
func displayData() {
print(dataProcessor.processData())
}
}```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 registrations: [ObjectIdentifier: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
registrations[ObjectIdentifier(type)] = { factory() as Any }
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = registrations[ObjectIdentifier(type)] else {
return nil
}
return factory() as? T
}
}
// Example usage:
class Database {
func fetchData() -> String {
return "Some data from the database"
}
}
class DataProcessor {
private let database: Database
init(database: Database) {
self.database = database
}
func processData() -> String {
return "Processed data: \(database.fetchData())"
}
}
class UIViewController {
private let dataProcessor: DataProcessor
init(dataProcessor: DataProcessor) {
self.dataProcessor = dataProcessor
}
func displayData() {
print(dataProcessor.processData())
}
}
// Registering dependencies
let container = DIContainer()
container.register(Database.self) { Database() }
container.register(DataProcessor.self) { DataProcessor(database: $0.resolve(Database.self)!) }
container.register(UIViewController.self) { UIViewController(dataProcessor: $0.resolve(DataProcessor.self)!) }
// Resolving dependencies
if let viewController = container.resolve(UIViewController.self) {
viewController.displayData()
}
```protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
class DIContainer: DIContainerProtocol {
private var registrations: [String: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
let key = String(describing: type)
registrations[key] = { factory() as Any }
}
func resolve<T>(_ type: T.Type) -> T? {
let key = String(describing: type)
guard let factory = registrations[key] else {
return nil
}
return factory() as? T
}
}
class MyClass {
var value: Int
init(value: Int) {
self.value = value
}
}```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 registrations: [String: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
let key = String(describing: type)
registrations[key] = { factory() as Any }
}
func resolve<T>(_ type: T.Type) -> T? {
let key = String(describing: type)
guard let factory = registrations[key] else {
return nil
}
return factory() as? T
}
}
// Example usage:
class MyClass {
var value: Int
init(value: Int) {
self.value = value
}
}
let container = DIContainer()
container.register(MyClass.self) { MyClass(value: 42) }
if let myInstance = container.resolve(MyClass.self) {
print(myInstance.value) // Output: 42
} else {
print("Instance not found.")
}
```protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
class DIContainer: DIContainerProtocol {
private var factories: [ObjectIdentifier: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[ObjectIdentifier(type)] = { factory() as Any }
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = factories[ObjectIdentifier(type)] else {
return nil
}
return factory() as? T
}
}
class MyService {
let message: String
init(message: String) {
self.message = message
}
}
class MyViewModel {
let service: MyService
init(service: MyService) {
self.service = service
}
}```swift
protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
// Simple dependency injection (DI) container.
class DIContainer: DIContainerProtocol {
private var factories: [ObjectIdentifier: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
factories[ObjectIdentifier(type)] = { factory() as Any }
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = factories[ObjectIdentifier(type)] else {
return nil
}
return factory() as? T
}
}
// Example usage:
class MyService {
let message: String
init(message: String) {
self.message = message
}
}
class MyViewModel {
let service: MyService
init(service: MyService) {
self.service = service
}
}
// Registering dependencies
let container = DIContainer()
container.register(MyService.self) { MyService(message: "Hello, DI!") }
container.register(MyViewModel.self) { MyViewModel(service: $0.resolve(MyService.self)!) }
// Resolving dependencies
if let viewModel = container.resolve(MyViewModel.self) {
print(viewModel.service.message) // Output: Hello, DI!
}
```protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
class DIContainer: DIContainerProtocol {
private var registry: [ObjectIdentifier: Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
registry[ObjectIdentifier(type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
return registry[ObjectIdentifier(type)] as? T
}
}
class DatabaseManager {
let url: String
init(url: String) {
self.url = url
}
}
class UserService {
let databaseManager: DatabaseManager
init(databaseManager: DatabaseManager) {
self.databaseManager = databaseManager
}
}
class App {
let userService: UserService
init(userService: UserService) {
self.userService = userService
}
}```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: [ObjectIdentifier: Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
registry[ObjectIdentifier(type)] = factory
}
func resolve<T>(_ type: T.Type) -> T? {
return registry[ObjectIdentifier(type)] as? T
}
}
// Example usage:
class DatabaseManager {
let url: String
init(url: String) {
self.url = url
}
}
class UserService {
let databaseManager: DatabaseManager
init(databaseManager: DatabaseManager) {
self.databaseManager = databaseManager
}
}
class App {
let userService: UserService
init(userService: UserService) {
self.userService = userService
}
}
// Register dependencies in the container
let container = DIContainer()
container.register(DatabaseManager.self) {
DatabaseManager(url: "example.com")
}
container.register(UserService.self) {
UserService(databaseManager: container.resolve(DatabaseManager.self)!)
}
container.register(App.self) {
App(userService: container.resolve(UserService.self)!)
}
// Resolve dependencies
let app = container.resolve(App.self)!
print(app.userService.databaseManager.url) // Output: example.com
``` // 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 registrations: [ObjectIdentifier: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
registrations[ObjectIdentifier(type)] = { factory() as Any }
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = registrations[ObjectIdentifier(type)] else {
return nil
}
return factory() as? T
}
}
class User {
let name: String
init(name: String) {
self.name = name
}
}
class UserService {
let user: User
init(user: User) {
self.user = user
}
}```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 registrations: [ObjectIdentifier: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
registrations[ObjectIdentifier(type)] = { factory() as Any }
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = registrations[ObjectIdentifier(type)] else {
return nil
}
return factory() as? T
}
}
// Example usage:
class User {
let name: String
init(name: String) {
self.name = name
}
}
class UserService {
let user: User
init(user: User) {
self.user = user
}
}
// Registering dependencies
let container = DIContainer()
container.register(User.self) { User(name: "John Doe") }
container.register(UserService.self) { UserService(user: $0.resolve(User.self)!) }
// Resolving dependencies
if let userService = container.resolve(UserService.self) {
print("User name: \(userService.user.name)")
} else {
print("Failed to resolve UserService")
}
```protocol DIContainerProtocol {
func register<T>(_ type: T.Type, factory: @escaping () -> T)
func resolve<T>(_ type: T.Type) -> T?
}
class DIContainer: DIContainerProtocol {
private var registrations: [ObjectIdentifier: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
registrations[ObjectIdentifier(type)] = { factory() as Any }
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = registrations[ObjectIdentifier(type)] else {
return nil
}
return factory() as? T
}
}
class User {
let name: String
init(name: String) {
self.name = name
}
}
class UserService {
private let user: User
init(user: User) {
self.user = user
}
func getUserName() -> String {
return user.name
}
}```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 registrations: [ObjectIdentifier: () -> Any] = [:]
func register<T>(_ type: T.Type, factory: @escaping () -> T) {
registrations[ObjectIdentifier(type)] = { factory() as Any }
}
func resolve<T>(_ type: T.Type) -> T? {
guard let factory = registrations[ObjectIdentifier(type)] else {
return nil
}
return factory() as? T
}
}
// Example usage:
class User {
let name: String
init(name: String) {
self.name = name
}
}
class UserService {
private let user: User
init(user: User) {
self.user = user
}
func getUserName() -> String {
return user.name
}
}
// Registering dependencies
let container = DIContainer()
container.register(User.self) { User(name: "John Doe") }
container.register(UserService.self) { UserService(user: $0.resolve(User.self)!) }
// Resolving dependencies
if let userService = container.resolve(UserService.self) {
print(userService.getUserName()) // Output: John Doe
}
```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 {
print("No transition defined for event \(event) from state \(state)")
return
}
state = nextState
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}
class TrafficLightStateMachine: StateMachine<TrafficLightState, TrafficLightEvent> {
enum TrafficLightState: Hashable {
case green, yellow, red
}
enum TrafficLightEvent: Hashable {
case switchToYellow, switchToRed
}
override init(state: TrafficLightState) {
super.init(state: state)
registerTransition(from: .green, to: .yellow, event: .switchToYellow)
registerTransition(from: .yellow, to: .red, event: .switchToRed)
}
}```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 {
print("No transition defined for event \(event) from state \(state)")
return
}
state = nextState
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}
// Example usage:
class TrafficLightStateMachine: StateMachine<TrafficLightState, TrafficLightEvent> {
enum TrafficLightState: Hashable {
case green, yellow, red
}
enum TrafficLightEvent: Hashable {
case switchToYellow, switchToRed
}
override init(state: TrafficLightState) {
super.init(state: state)
registerTransition(from: .green, to: .yellow, event: .switchToYellow)
registerTransition(from: .yellow, to: .red, event: .switchToRed)
}
}
let trafficLight = TrafficLightStateMachine(state: .green)
trafficLight.trigger(event: .switchToYellow)
print(trafficLight.state) // Output: yellow
trafficLight.trigger(event: .switchToRed)
print(trafficLight.state) // Output: red
```private var state: State // property 'state' must be declared internal because it matches a requirement in internal protocol 'StateMachineProtocol'class TrafficLightStateMachine: StateMachine<TrafficLightState, TrafficLightEvent> { // cannot find type 'TrafficLightState' in scopeoverride init(state: TrafficLightState) { // initializer does not override a designated initializer from its superclassregisterTransition(from: .green, to: .yellow, event: .switchToYellow) // type of expression is ambiguous without a type annotationregisterTransition(from: .yellow, to: .red, event: .switchToRed) // type of expression is ambiguous without a type annotationprotocol 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 {
print("No transition defined for event \(event) from state \(state)")
return
}
state = nextState
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}
class TrafficLightStateMachine: StateMachine<String, String> {
override init(state: String) {
super.init(state: state)
registerTransition(from: "red", to: "yellow", event: "change")
registerTransition(from: "yellow", to: "green", event: "change")
registerTransition(from: "green", to: "red", event: "change")
}
}```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 {
print("No transition defined for event \(event) from state \(state)")
return
}
state = nextState
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}
// Example usage:
class TrafficLightStateMachine: StateMachine<String, String> {
override init(state: String) {
super.init(state: state)
registerTransition(from: "red", to: "yellow", event: "change")
registerTransition(from: "yellow", to: "green", event: "change")
registerTransition(from: "green", to: "red", event: "change")
}
}
let trafficLight = TrafficLightStateMachine(state: "red")
print(trafficLight.state) // Output: red
trafficLight.trigger(event: "change")
print(trafficLight.state) // Output: yellow
trafficLight.trigger(event: "change")
print(trafficLight.state) // Output: green
trafficLight.trigger(event: "change")
print(trafficLight.state) // Output: red
```private var state: State // property 'state' must be declared internal because it matches a requirement in internal protocol 'StateMachineProtocol'override init(state: String) { // 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 nextState = transitions[state]?[event] else {
print("No transition found for event \(event) from state \(state)")
return
}
state = nextState
print("Transitioned from state \(state) to 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 {
print("No transition found for event \(event) from state \(state)")
return
}
state = nextState
print("Transitioned from state \(state) to state \(nextState)")
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}
// Example usage:
let stateMachine = StateMachine<String, String>(state: "initial")
stateMachine.registerTransition(from: "initial", to: "state1", event: "event1")
stateMachine.registerTransition(from: "state1", to: "state2", event: "event2")
stateMachine.trigger(event: "event1") // Transitioned from state initial to state state1
stateMachine.trigger(event: "event2") // Transitioned from state state1 to state state2
```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 {
print("No transition defined for event \(event) from state \(state)")
return
}
state = nextState
print("Transitioned from \(state) to \(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 {
print("No transition defined for event \(event) from state \(state)")
return
}
state = nextState
print("Transitioned from \(state) to \(nextState)")
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}
// Example usage:
let machine = StateMachine<String, String>(state: "A")
machine.registerTransition(from: "A", to: "B", event: "e1")
machine.registerTransition(from: "B", to: "C", event: "e2")
machine.trigger(event: "e1") // Transitioned from A to B
machine.trigger(event: "e2") // Transitioned from B to C
```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 {
print("No transition defined for event \(event) from state \(state)")
return
}
state = nextState
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}
class TrafficLightStateMachine: StateMachine<TrafficLightState, TrafficLightEvent> {
enum TrafficLightState: Hashable {
case green, yellow, red
}
enum TrafficLightEvent: Hashable {
case change
}
override init(state: TrafficLightState) {
super.init(state: state)
registerTransition(from: .green, to: .yellow, event: .change)
registerTransition(from: .yellow, to: .red, event: .change)
registerTransition(from: .red, to: .green, event: .change)
}
}```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 {
print("No transition defined for event \(event) from state \(state)")
return
}
state = nextState
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}
// Example usage:
class TrafficLightStateMachine: StateMachine<TrafficLightState, TrafficLightEvent> {
enum TrafficLightState: Hashable {
case green, yellow, red
}
enum TrafficLightEvent: Hashable {
case change
}
override init(state: TrafficLightState) {
super.init(state: state)
registerTransition(from: .green, to: .yellow, event: .change)
registerTransition(from: .yellow, to: .red, event: .change)
registerTransition(from: .red, to: .green, event: .change)
}
}
let trafficLight = TrafficLightStateMachine(state: .green)
trafficLight.trigger(event: .change) // Transition from green to yellow
trafficLight.trigger(event: .change) // Transition from yellow to red
trafficLight.trigger(event: .change) // Transition from red to green
```private var state: State // property 'state' must be declared internal because it matches a requirement in internal protocol 'StateMachineProtocol'class TrafficLightStateMachine: StateMachine<TrafficLightState, TrafficLightEvent> { // cannot find type 'TrafficLightState' in scopeoverride init(state: TrafficLightState) { // initializer does not override a designated initializer from its superclassregisterTransition(from: .green, to: .yellow, event: .change) // type of expression is ambiguous without a type annotationregisterTransition(from: .yellow, to: .red, event: .change) // type of expression is ambiguous without a type annotationregisterTransition(from: .red, to: .green, event: .change) // type of expression is ambiguous without a type annotationprotocol 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 currentState: State
private var transitions: [State: [Event: State]] = [:]
required init(state: State) {
self.currentState = state
}
var state: State {
return currentState
}
func trigger(event: Event) {
guard let nextState = transitions[currentState]?[event] else {
print("No transition defined for event \(event) in state \(currentState)")
return
}
currentState = nextState
print("Transitioned from \(currentState) to \(nextState)")
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}
class TrafficLightStateMachine: StateMachine<String, String> {
override init(state: String) {
super.init(state: state)
registerTransition(from: "red", to: "green", event: "change")
registerTransition(from: "green", to: "yellow", event: "change")
registerTransition(from: "yellow", to: "red", event: "change")
}
}```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 currentState: State
private var transitions: [State: [Event: State]] = [:]
required init(state: State) {
self.currentState = state
}
var state: State {
return currentState
}
func trigger(event: Event) {
guard let nextState = transitions[currentState]?[event] else {
print("No transition defined for event \(event) in state \(currentState)")
return
}
currentState = nextState
print("Transitioned from \(currentState) to \(nextState)")
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}
// Example usage:
class TrafficLightStateMachine: StateMachine<String, String> {
override init(state: String) {
super.init(state: state)
registerTransition(from: "red", to: "green", event: "change")
registerTransition(from: "green", to: "yellow", event: "change")
registerTransition(from: "yellow", to: "red", event: "change")
}
}
let trafficLight = TrafficLightStateMachine(state: "red")
trafficLight.trigger(event: "change") // Transitioned from red to green
trafficLight.trigger(event: "change") // Transitioned from green to yellow
trafficLight.trigger(event: "change") // Transitioned from yellow to red
```override init(state: String) { // 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 currentState: State
private var transitions: [State: [Event: State]] = [:]
required init(state: State) {
self.currentState = state
}
var state: State {
return currentState
}
func trigger(event: Event) {
guard let nextState = transitions[currentState]?[event] else {
print("No transition defined for event \(event) from state \(currentState)")
return
}
currentState = nextState
print("Transitioned from \(currentState) to \(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 currentState: State
private var transitions: [State: [Event: State]] = [:]
required init(state: State) {
self.currentState = state
}
var state: State {
return currentState
}
func trigger(event: Event) {
guard let nextState = transitions[currentState]?[event] else {
print("No transition defined for event \(event) from state \(currentState)")
return
}
currentState = nextState
print("Transitioned from \(currentState) to \(nextState)")
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}
// Example usage:
let stateMachine = StateMachine<String, String>(state: "A")
stateMachine.registerTransition(from: "A", to: "B", event: "E1")
stateMachine.registerTransition(from: "B", to: "C", event: "E2")
stateMachine.trigger(event: "E1") // Transitioned from A to B
stateMachine.trigger(event: "E2") // Transitioned from B to C
```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 {
print("No transition defined for event \(event) from state \(state)")
return
}
state = nextState
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}```swift
protocol StateMachineProtocol {
associatedtype State: Hashable
associatedtype Event: Hashable
init(state: State)
var state: State { get }
func trigger(event: Event)
func registerTransition(from: State, to: State, event: Event)
}
// Finite state machine with possibility to register custom transitions between states.
class StateMachine<State: Hashable, Event: Hashable>: StateMachineProtocol {
private var state: State
private var transitions: [State: [Event: State]] = [:]
required init(state: State) {
self.state = state
}
func trigger(event: Event) {
guard let nextState = transitions[state]?[event] else {
print("No transition defined for event \(event) from state \(state)")
return
}
state = nextState
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}
// Example usage:
let stateMachine = StateMachine<String, String>(state: "A")
stateMachine.registerTransition(from: "A", to: "B", event: "E1")
stateMachine.registerTransition(from: "B", to: "C", event: "E2")
stateMachine.trigger(event: "E1")
print(stateMachine.state) // Output: B
stateMachine.trigger(event: "E2")
print(stateMachine.state) // Output: C
```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 currentState: State
private var transitions: [State: [Event: State]] = [:]
required init(state: State) {
self.currentState = state
}
var state: State {
return currentState
}
func trigger(event: Event) {
guard let nextState = transitions[currentState]?[event] else {
fatalError("No transition defined for state \(currentState) and event \(event)")
}
currentState = 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 currentState: State
private var transitions: [State: [Event: State]] = [:]
required init(state: State) {
self.currentState = state
}
var state: State {
return currentState
}
func trigger(event: Event) {
guard let nextState = transitions[currentState]?[event] else {
fatalError("No transition defined for state \(currentState) and event \(event)")
}
currentState = nextState
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}
// Example usage:
let stateMachine = StateMachine<String, String>(state: "A")
stateMachine.registerTransition(from: "A", to: "B", event: "1")
stateMachine.registerTransition(from: "B", to: "C", event: "2")
stateMachine.registerTransition(from: "C", to: "D", event: "3")
print(stateMachine.state) // Output: A
stateMachine.trigger(event: "1")
print(stateMachine.state) // Output: B
stateMachine.trigger(event: "2")
print(stateMachine.state) // Output: C
stateMachine.trigger(event: "3")
print(stateMachine.state) // Output: D
```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 currentState: State
private var transitions: [State: [Event: State]] = [:]
required init(state: State) {
self.currentState = state
}
var state: State {
return currentState
}
func trigger(event: Event) {
guard let nextState = transitions[currentState]?[event] else {
print("No transition defined for event \(event) from state \(currentState)")
return
}
currentState = nextState
print("Transitioned from state \(currentState) to 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 currentState: State
private var transitions: [State: [Event: State]] = [:]
required init(state: State) {
self.currentState = state
}
var state: State {
return currentState
}
func trigger(event: Event) {
guard let nextState = transitions[currentState]?[event] else {
print("No transition defined for event \(event) from state \(currentState)")
return
}
currentState = nextState
print("Transitioned from state \(currentState) to state \(nextState)")
}
func registerTransition(from: State, to: State, event: Event) {
transitions[from, default: [:]][event] = to
}
}
// Example usage:
let machine = StateMachine<String, String>(state: "A")
machine.registerTransition(from: "A", to: "B", event: "E")
machine.trigger(event: "E") // Output: Transitioned from state A to state B
```indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(_, let size):
return size
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file:
return 0
case .directory(_, let contents):
return 1 + contents.map { $0.treeDepth }.max()!
}
}
}```swift
indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(_, let size):
return size
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file:
return 0
case .directory(_, let contents):
return 1 + contents.map { $0.treeDepth }.max()!
}
}
}
// Example usage:
let fileSystem = FileSystemNode.directory(name: "/", contents: [
.file(name: "file1.txt", size: 100),
.directory(name: "subdir", contents: [
.file(name: "file2.txt", size: 200),
.directory(name: "subsubdir", contents: [
.file(name: "file3.txt", size: 300)
])
])
])
print("Total size: \(fileSystem.totalSize)")
print("Files count: \(fileSystem.filesCount)")
print("Tree depth: \(fileSystem.treeDepth)")
``` // Fatal error: Unexpectedly found nil while unwrapping an Optional valueindirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(_, let size):
return size
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file:
return 1
case .directory(_, let contents):
return 1 + contents.map { $0.treeDepth }.max()!
}
}
}```swift
indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(_, let size):
return size
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file:
return 1
case .directory(_, let contents):
return 1 + contents.map { $0.treeDepth }.max()!
}
}
}
// Example usage:
let fileSystem = FileSystemNode.directory(name: "/", contents: [
.file(name: "file1.txt", size: 100),
.directory(name: "subdir", contents: [
.file(name: "file2.txt", size: 200),
.directory(name: "subsubdir", contents: [
.file(name: "file3.txt", size: 300)
])
])
])
print("Total size: \(fileSystem.totalSize)")
print("Files count: \(fileSystem.filesCount)")
print("Tree depth: \(fileSystem.treeDepth)")
``` // Fatal error: Unexpectedly found nil while unwrapping an Optional valueindirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(_, let size):
return size
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file:
return 1
case .directory(_, let contents):
return 1 + contents.map { $0.treeDepth }.max()!
}
}
}```swift
indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(_, let size):
return size
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file:
return 1
case .directory(_, let contents):
return 1 + contents.map { $0.treeDepth }.max()!
}
}
}
// Example usage:
let fileSystem = FileSystemNode.directory(name: "/", contents: [
FileSystemNode.directory(name: "bin", contents: []),
FileSystemNode.file(name: "readme.txt", size: 1024),
FileSystemNode.directory(name: "lib", contents: [
FileSystemNode.file(name: "lib1.so", size: 2048),
FileSystemNode.file(name: "lib2.so", size: 4096)
])
])
print("Total size of all files: \(fileSystem.totalSize)")
print("Files count: \(fileSystem.filesCount)")
print("File system tree depth: \(fileSystem.treeDepth)")
``` // Fatal error: Unexpectedly found nil while unwrapping an Optional valueindirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(_, let size):
return size
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file:
return 1
case .directory(_, let contents):
return 1 + contents.map { $0.treeDepth }.max()!
}
}
}```swift
indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(_, let size):
return size
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file:
return 1
case .directory(_, let contents):
return 1 + contents.map { $0.treeDepth }.max()!
}
}
}
// Example usage:
let fileSystem = FileSystemNode.directory(name: "/", contents: [
.file(name: "file1.txt", size: 100),
.directory(name: "subdir", contents: [
.file(name: "file2.txt", size: 200),
.directory(name: "subsubdir", contents: [
.file(name: "file3.txt", size: 300)
])
])
])
print("Total size: \(fileSystem.totalSize)")
print("Files count: \(fileSystem.filesCount)")
print("Tree depth: \(fileSystem.treeDepth)")
``` // Fatal error: Unexpectedly found nil while unwrapping an Optional valueindirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(_, let size):
return size
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file:
return 1
case .directory(_, let contents):
return 1 + contents.map { $0.treeDepth }.max()!
}
}
}```swift
indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(_, let size):
return size
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file:
return 1
case .directory(_, let contents):
return 1 + contents.map { $0.treeDepth }.max()!
}
}
}
// Example usage:
let fileSystem = FileSystemNode.directory(name: "/", contents: [
FileSystemNode.directory(name: "bin", contents: []),
FileSystemNode.directory(name: "etc", contents: []),
FileSystemNode.directory(name: "home", contents: [
FileSystemNode.directory(name: "user1", contents: [
FileSystemNode.file(name: "file1.txt", size: 100),
FileSystemNode.file(name: "file2.txt", size: 200)
]),
FileSystemNode.directory(name: "user2", contents: [
FileSystemNode.file(name: "file3.txt", size: 300),
FileSystemNode.file(name: "file4.txt", size: 400)
])
]),
FileSystemNode.directory(name: "var", contents: [
FileSystemNode.directory(name: "log", contents: [
FileSystemNode.file(name: "log1.txt", size: 50),
FileSystemNode.file(name: "log2.txt", size: 60)
])
])
])
let totalSize = fileSystem.totalSize
let filesCount = fileSystem.filesCount
let treeDepth = fileSystem.treeDepth
print("Total size: \(totalSize)")
print("Files count: \(filesCount)")
print("Tree depth: \(treeDepth)")
``` // Fatal error: Unexpectedly found nil while unwrapping an Optional valueindirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(_, let size):
return size
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file:
return 0
case .directory(_, let contents):
return 1 + contents.map { $0.treeDepth }.max()!
}
}
}```swift
indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(_, let size):
return size
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file:
return 0
case .directory(_, let contents):
return 1 + contents.map { $0.treeDepth }.max()!
}
}
}
// Example usage:
let fileSystem = FileSystemNode.directory(name: "/", contents: [
FileSystemNode.directory(name: "bin", contents: []),
FileSystemNode.directory(name: "etc", contents: []),
FileSystemNode.file(name: "hello.txt", size: 100),
FileSystemNode.file(name: "world.txt", size: 200)
])
print("Total size: \(fileSystem.totalSize)")
print("Files count: \(fileSystem.filesCount)")
print("Tree depth: \(fileSystem.treeDepth)")
``` // Fatal error: Unexpectedly found nil while unwrapping an Optional valueindirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(_, let size):
return size
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file:
return 1
case .directory(_, let contents):
return 1 + contents.map { $0.treeDepth }.max()!
}
}
}```swift
indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(_, let size):
return size
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file:
return 1
case .directory(_, let contents):
return 1 + contents.map { $0.treeDepth }.max()!
}
}
}
// Example usage:
let fileSystem = FileSystemNode.directory(name: "/", contents: [
.file(name: "file1.txt", size: 100),
.directory(name: "subdir1", contents: [
.file(name: "file2.txt", size: 200),
.directory(name: "subsubdir1", contents: [
.file(name: "file3.txt", size: 300)
])
]),
.directory(name: "subdir2", contents: [
.file(name: "file4.txt", size: 400)
])
])
print("Total size: \(fileSystem.totalSize)")
print("Files count: \(fileSystem.filesCount)")
print("Tree depth: \(fileSystem.treeDepth)")
``` // Fatal error: Unexpectedly found nil while unwrapping an Optional valueindirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(_, let size):
return size
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file:
return 1
case .directory(_, let contents):
return 1 + contents.map { $0.treeDepth }.max()!
}
}
}```swift
indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(_, let size):
return size
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file:
return 1
case .directory(_, let contents):
return 1 + contents.map { $0.treeDepth }.max()!
}
}
}
// Example usage:
let fileSystem = FileSystemNode.directory(name: "/", contents: [
.file(name: "file1.txt", size: 100),
.directory(name: "subdir1", contents: [
.file(name: "file2.txt", size: 200),
.directory(name: "subsubdir1", contents: [
.file(name: "file3.txt", size: 300)
])
]),
.directory(name: "subdir2", contents: [
.file(name: "file4.txt", size: 400)
])
])
print("Total size: \(fileSystem.totalSize)")
print("Files count: \(fileSystem.filesCount)")
print("Tree depth: \(fileSystem.treeDepth)")
``` // Fatal error: Unexpectedly found nil while unwrapping an Optional valueindirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(_, let size):
return size
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file:
return 0
case .directory(_, let contents):
return 1 + contents.map { $0.treeDepth }.max()!
}
}
}```swift
indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(_, let size):
return size
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file:
return 0
case .directory(_, let contents):
return 1 + contents.map { $0.treeDepth }.max()!
}
}
}
// Example usage:
let fileSystem = FileSystemNode.directory(name: "/", contents: [
FileSystemNode.directory(name: "bin", contents: []),
FileSystemNode.file(name: "hello.txt", size: 100),
FileSystemNode.directory(name: "lib", contents: [
FileSystemNode.file(name: "lib1.a", size: 200),
FileSystemNode.file(name: "lib2.a", size: 300)
])
])
print("Total size: \(fileSystem.totalSize)")
print("Files count: \(fileSystem.filesCount)")
print("Tree depth: \(fileSystem.treeDepth)")
``` // Fatal error: Unexpectedly found nil while unwrapping an Optional valueindirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(_, let size):
return size
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file:
return 1
case .directory(_, let contents):
return 1 + contents.map { $0.treeDepth }.max()!
}
}
}```swift
indirect enum FileSystemNode {
case file(name: String, size: Int)
case directory(name: String, contents: [FileSystemNode])
}
protocol FileSystemInfo {
var totalSize: Int { get }
var filesCount: Int { get }
var treeDepth: Int { get }
}
// Abstract file system manager and metadata calculation.
// Used to calculate total size of all files in file system, files count and file system tree depth.
extension FileSystemNode: FileSystemInfo {
var totalSize: Int {
switch self {
case .file(_, let size):
return size
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.totalSize }
}
}
var filesCount: Int {
switch self {
case .file:
return 1
case .directory(_, let contents):
return contents.reduce(0) { $0 + $1.filesCount }
}
}
var treeDepth: Int {
switch self {
case .file:
return 1
case .directory(_, let contents):
return 1 + contents.map { $0.treeDepth }.max()!
}
}
}
// Example usage:
let fileSystem = FileSystemNode.directory(name: "/", contents: [
.file(name: "file1.txt", size: 100),
.directory(name: "subdir", contents: [
.file(name: "file2.txt", size: 200),
.directory(name: "subsubdir", contents: [
.file(name: "file3.txt", size: 300)
])
])
])
print("Total size: \(fileSystem.totalSize)")
print("Files count: \(fileSystem.filesCount)")
print("Tree depth: \(fileSystem.treeDepth)")
``` // Fatal error: Unexpectedly found nil while unwrapping an Optional valueprotocol 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()
}
}
func areBracketsMatched(_ input: String) -> Bool {
let bracketPairs: [Character: Character] = [")": "(", "]": "[", "}": "{"]
let stack = Stack<Character>()
for char in input {
if bracketPairs.values.contains(char) {
stack.push(char)
} else if bracketPairs.keys.contains(char) {
if stack.pop() != bracketPairs[char] {
return false
}
}
}
return stack.elements.isEmpty
}```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()
}
}
// Function to check if the brackets in the given string are properly nested and matched.
func areBracketsMatched(_ input: String) -> Bool {
let bracketPairs: [Character: Character] = [")": "(", "]": "[", "}": "{"]
let stack = Stack<Character>()
for char in input {
if bracketPairs.values.contains(char) {
stack.push(char)
} else if bracketPairs.keys.contains(char) {
if stack.pop() != bracketPairs[char] {
return false
}
}
}
return stack.elements.isEmpty
}
// Example usage:
let testString = "{[()()]}"
print(areBracketsMatched(testString)) // Output: true
let testStringWithMismatch = "{[(])}"
print(areBracketsMatched(testStringWithMismatch)) // Output: false
```return stack.elements.isEmpty // 'elements' is inaccessible due to 'private' protection levelvar 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()
}
}
func areBracketsBalanced(_ input: String) -> Bool {
let bracketPairs: [Character: Character] = [")": "(", "}": "{", "]": "["]
let stack = Stack<Character>()
for char in input {
if let openingBracket = bracketPairs[char] {
if stack.pop() != openingBracket {
return false
}
} else if char == "(" || char == "{" || char == "[" {
stack.push(char)
}
}
return stack.elements.isEmpty
}```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()
}
}
// Function to check if the brackets in the given string are balanced.
func areBracketsBalanced(_ input: String) -> Bool {
let bracketPairs: [Character: Character] = [")": "(", "}": "{", "]": "["]
let stack = Stack<Character>()
for char in input {
if let openingBracket = bracketPairs[char] {
if stack.pop() != openingBracket {
return false
}
} else if char == "(" || char == "{" || char == "[" {
stack.push(char)
}
}
return stack.elements.isEmpty
}
// Example usage:
let balancedString = "{[()()]}"
let unbalancedString = "{[(])}"
print(areBracketsBalanced(balancedString)) // Output: true
print(areBracketsBalanced(unbalancedString)) // Output: false
```return stack.elements.isEmpty // 'elements' is inaccessible due to 'private' protection levelvar stack = Stack<Int>() // variable 'stack' was never mutated; consider changing to 'let' constantprotocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
class Stack<Element>: StackProtocol {
private var elements: [Element] = []
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
class StringReverser {
func reverse(_ inputString: String) -> String {
var stack = Stack<Character>()
for char in inputString {
stack.push(char)
}
var reversedString = ""
while let char = stack.pop() {
reversedString.append(char)
}
return reversedString
}
}```swift
protocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
private var elements: [Element] = []
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// A class that uses a stack to reverse a string.
class StringReverser {
func reverse(_ inputString: String) -> String {
var stack = Stack<Character>()
for char in inputString {
stack.push(char)
}
var reversedString = ""
while let char = stack.pop() {
reversedString.append(char)
}
return reversedString
}
}
// Example usage:
let stringReverser = StringReverser()
let originalString = "hello"
let reversedString = stringReverser.reverse(originalString)
print("Original: \(originalString)")
print("Reversed: \(reversedString)")
```class Stack<Element>: StackProtocol { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack<Element>'var stack = Stack<Character>() // variable 'stack' was never mutated; consider changing to 'let' constantvar stack = Stack<Int>() // variable 'stack' was never mutated; consider changing to 'let' constantprotocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
class Stack<T>: StackProtocol {
private var elements: [T] = []
func push(_ element: T) {
elements.append(element)
}
func pop() -> T? {
return elements.popLast()
}
}
class ParenthesesChecker {
static func isBalanced(_ input: String) -> Bool {
let stack = Stack<Character>()
let openingParentheses: Set<Character> = ["(", "[", "{"]
let closingParentheses: Set<Character> = [")", "]", "}"]
for char in input {
if openingParentheses.contains(char) {
stack.push(char)
} else if closingParentheses.contains(char) {
guard let lastOpen = stack.pop() else {
return false
}
if !matches(lastOpen, char) {
return false
}
}
}
return stack.elements.isEmpty
}
private static func matches(_ open: Character, _ close: Character) -> Bool {
let pairs: [Character: Character] = ["(": ")", "[": "]", "{": "}"]
return pairs[open] == close
}
}```swift
protocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
// Generic stack with push and pop functions.
class Stack<T>: StackProtocol {
private var elements: [T] = []
func push(_ element: T) {
elements.append(element)
}
func pop() -> T? {
return elements.popLast()
}
}
// A class that uses a stack to check for balanced parentheses.
class ParenthesesChecker {
static func isBalanced(_ input: String) -> Bool {
let stack = Stack<Character>()
let openingParentheses: Set<Character> = ["(", "[", "{"]
let closingParentheses: Set<Character> = [")", "]", "}"]
for char in input {
if openingParentheses.contains(char) {
stack.push(char)
} else if closingParentheses.contains(char) {
guard let lastOpen = stack.pop() else {
return false
}
if !matches(lastOpen, char) {
return false
}
}
}
return stack.elements.isEmpty
}
private static func matches(_ open: Character, _ close: Character) -> Bool {
let pairs: [Character: Character] = ["(": ")", "[": "]", "{": "}"]
return pairs[open] == close
}
}
// Example usage:
let inputString = "{[()()]}"
print(ParenthesesChecker.isBalanced(inputString)) // Output: true
```class Stack<T>: StackProtocol { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack<T>'return stack.elements.isEmpty // 'elements' is inaccessible due to 'private' protection levelvar 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: [T] = []
func push(_ element: T) {
elements.append(element)
}
func pop() -> T? {
return elements.popLast()
}
}
func isPalindrome(_ input: String) -> Bool {
let stack = Stack<Character>()
for char in input {
stack.push(char)
}
var reversedString = ""
while let char = stack.pop() {
reversedString.append(char)
}
return input == reversedString
}
func main() {
let testString = "racecar"
print("The string '\(testString)' is a palindrome: \(isPalindrome(testString))")
}```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: [T] = []
func push(_ element: T) {
elements.append(element)
}
func pop() -> T? {
return elements.popLast()
}
}
// Function to check if a string is a palindrome using a stack.
func isPalindrome(_ input: String) -> Bool {
let stack = Stack<Character>()
for char in input {
stack.push(char)
}
var reversedString = ""
while let char = stack.pop() {
reversedString.append(char)
}
return input == reversedString
}
// Main function to test the isPalindrome function.
func main() {
let testString = "racecar"
print("The string '\(testString)' is a palindrome: \(isPalindrome(testString))")
}
main() // Run the test function
```class Stack<T>: StackProtocol { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack<T>'var stack = Stack<Int>() // variable 'stack' was never mutated; consider changing to 'let' constantprotocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
class Stack<Element>: StackProtocol {
private var elements: [Element] = []
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
func isPalindrome(_ input: String) -> Bool {
let stack = Stack<Character>()
for character in input {
stack.push(character)
}
var reversedString = ""
while let poppedCharacter = stack.pop() {
reversedString.append(poppedCharacter)
}
return input == reversedString
}
func main() {
let testString = "racecar"
print("The string '\(testString)' is a palindrome: \(isPalindrome(testString))")
}```swift
protocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
// Generic stack with push and pop functions.
class Stack<Element>: StackProtocol {
private var elements: [Element] = []
func push(_ element: Element) {
elements.append(element)
}
func pop() -> Element? {
return elements.popLast()
}
}
// Function to check if a string is a palindrome using a stack.
func isPalindrome(_ input: String) -> Bool {
let stack = Stack<Character>()
for character in input {
stack.push(character)
}
var reversedString = ""
while let poppedCharacter = stack.pop() {
reversedString.append(poppedCharacter)
}
return input == reversedString
}
// Main function to test the isPalindrome function.
func main() {
let testString = "racecar"
print("The string '\(testString)' is a palindrome: \(isPalindrome(testString))")
}
main() // Run the main function to test.
```class Stack<Element>: StackProtocol { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack<Element>'var stack = Stack<Int>() // variable 'stack' was never mutated; consider changing to 'let' constantprotocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
class Stack<T>: StackProtocol {
private var elements: [T] = []
func push(_ element: T) {
elements.append(element)
}
func pop() -> T? {
return elements.popLast()
}
}
func isPalindrome(_ input: String) -> Bool {
let stack = Stack<Character>()
for char in input {
stack.push(char)
}
var reversedString = ""
while let char = stack.pop() {
reversedString.append(char)
}
return input == reversedString
}
func main() {
let testString = "racecar"
print("The string '\(testString)' is a palindrome: \(isPalindrome(testString))")
}```swift
protocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
// Generic stack with push and pop functions.
class Stack<T>: StackProtocol {
private var elements: [T] = []
func push(_ element: T) {
elements.append(element)
}
func pop() -> T? {
return elements.popLast()
}
}
// Function to check if a string is a palindrome using a stack.
func isPalindrome(_ input: String) -> Bool {
let stack = Stack<Character>()
for char in input {
stack.push(char)
}
var reversedString = ""
while let char = stack.pop() {
reversedString.append(char)
}
return input == reversedString
}
// Main function to test the isPalindrome function.
func main() {
let testString = "racecar"
print("The string '\(testString)' is a palindrome: \(isPalindrome(testString))")
}
main() // Run the main function to test the isPalindrome function.
```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<T>: StackProtocol {
typealias Element = T
private var elements: [T] = []
func push(_ element: T) {
elements.append(element)
}
func pop() -> T? {
return elements.popLast()
}
}
func areBracketsBalanced(_ input: String) -> Bool {
let bracketPairs: [Character: Character] = [")": "(", "}": "{", "]": "["]
let stack = Stack<Character>()
for char in input {
if bracketPairs.values.contains(char) {
stack.push(char)
} else if bracketPairs.keys.contains(char) {
if stack.pop() != bracketPairs[char] {
return false
}
}
}
return stack.elements.isEmpty
}```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: [T] = []
func push(_ element: T) {
elements.append(element)
}
func pop() -> T? {
return elements.popLast()
}
}
// Function to check if the brackets in the input string are balanced.
func areBracketsBalanced(_ input: String) -> Bool {
let bracketPairs: [Character: Character] = [")": "(", "}": "{", "]": "["]
let stack = Stack<Character>()
for char in input {
if bracketPairs.values.contains(char) {
stack.push(char)
} else if bracketPairs.keys.contains(char) {
if stack.pop() != bracketPairs[char] {
return false
}
}
}
return stack.elements.isEmpty
}
// Example usage:
let balancedString = "{[()()]}"
let unbalancedString = "{[(])}"
print(areBracketsBalanced(balancedString)) // Output: true
print(areBracketsBalanced(unbalancedString)) // Output: false
```class Stack<T>: StackProtocol { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack<T>'return stack.elements.isEmpty // 'elements' is inaccessible due to 'private' protection levelvar stack = Stack<Int>() // variable 'stack' was never mutated; consider changing to 'let' constantprotocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
class Stack<T>: StackProtocol {
private var elements: [T] = []
func push(_ element: T) {
elements.append(element)
}
func pop() -> T? {
return elements.popLast()
}
}
func areBracketsMatched(_ input: String) -> Bool {
let bracketPairs: [Character: Character] = [")": "(", "]": "[", "}": "{"]
let stack = Stack<Character>()
for char in input {
if bracketPairs.values.contains(char) {
stack.push(char)
} else if bracketPairs.keys.contains(char) {
if stack.pop() != bracketPairs[char] {
return false
}
}
}
return stack.elements.isEmpty
}```swift
protocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
// Generic stack with push and pop functions.
class Stack<T>: StackProtocol {
private var elements: [T] = []
func push(_ element: T) {
elements.append(element)
}
func pop() -> T? {
return elements.popLast()
}
}
// Function to check if the brackets in the given string are properly nested and matched.
func areBracketsMatched(_ input: String) -> Bool {
let bracketPairs: [Character: Character] = [")": "(", "]": "[", "}": "{"]
let stack = Stack<Character>()
for char in input {
if bracketPairs.values.contains(char) {
stack.push(char)
} else if bracketPairs.keys.contains(char) {
if stack.pop() != bracketPairs[char] {
return false
}
}
}
return stack.elements.isEmpty
}
// Example usage:
let testString = "{[()()]}"
print(areBracketsMatched(testString)) // Output: true
let testStringWithMismatch = "{[(])}"
print(areBracketsMatched(testStringWithMismatch)) // Output: false
```class Stack<T>: StackProtocol { // initializer requirement 'init()' can only be satisfied by a 'required' initializer in non-final class 'Stack<T>'return stack.elements.isEmpty // 'elements' is inaccessible due to 'private' protection levelvar stack = Stack<Int>() // variable 'stack' was never mutated; consider changing to 'let' constantprotocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
class Stack<T>: StackProtocol {
private var elements: [T] = []
func push(_ element: T) {
elements.append(element)
}
func pop() -> T? {
return elements.popLast()
}
}
class StringReverser {
func reverseString(_ inputString: String) -> String {
let stack = Stack<Character>()
// Push all characters of the string onto the stack
for character in inputString {
stack.push(character)
}
// Pop all characters from the stack and append to the result
var reversedString = ""
while let character = stack.pop() {
reversedString.append(character)
}
return reversedString
}
}```swift
protocol StackProtocol {
associatedtype Element
init()
func push(_ element: Element)
func pop() -> Element?
}
// Generic stack with push and pop functions.
class Stack<T>: StackProtocol {
private var elements: [T] = []
func push(_ element: T) {
elements.append(element)
}
func pop() -> T? {
return elements.popLast()
}
}
// A class that uses a stack to reverse a string.
class StringReverser {
func reverseString(_ inputString: String) -> String {
let stack = Stack<Character>()
// Push all characters of the string onto the stack
for character in inputString {
stack.push(character)
}
// Pop all characters from the stack and append to the result
var reversedString = ""
while let character = stack.pop() {
reversedString.append(character)
}
return reversedString
}
}
// Example usage:
let stringReverser = StringReverser()
let originalString = "hello"
let reversedString = stringReverser.reverseString(originalString)
print("Original: \(originalString)")
print("Reversed: \(reversedString)")
```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 CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
class Cache<Key: Hashable, Element>: CacheProtocol {
private var capacity: Int
private var cache: [Key: Element]
private var accessOrder: [Key]
init(capacity: Int) {
self.capacity = capacity
self.cache = [:]
self.accessOrder = []
}
subscript(key: Key) -> Element? {
get {
if let value = cache[key] {
accessOrder.removeAll(where: { $0 == key })
accessOrder.append(key)
return value
}
return nil
}
set {
if let value = newValue {
cache[key] = value
accessOrder.removeAll(where: { $0 == key })
accessOrder.append(key)
if cache.count > capacity {
if let leastRecentlyUsedKey = accessOrder.first {
cache.removeValue(forKey: leastRecentlyUsedKey)
accessOrder.removeFirst()
}
}
} else {
cache.removeValue(forKey: key)
accessOrder.removeAll(where: { $0 == key })
}
}
}
}```swift
protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
// Generic in-memory cache that follows to the LRU (Least Recently Used) eviction policy.
// The cache should have a specified capacity limit, and when this limit is reached, it should remove the least recently used item to make space for new entries.
class Cache<Key: Hashable, Element>: CacheProtocol {
private var capacity: Int
private var cache: [Key: Element]
private var accessOrder: [Key]
init(capacity: Int) {
self.capacity = capacity
self.cache = [:]
self.accessOrder = []
}
subscript(key: Key) -> Element? {
get {
if let value = cache[key] {
accessOrder.removeAll(where: { $0 == key })
accessOrder.append(key)
return value
}
return nil
}
set {
if let value = newValue {
cache[key] = value
accessOrder.removeAll(where: { $0 == key })
accessOrder.append(key)
if cache.count > capacity {
if let leastRecentlyUsedKey = accessOrder.first {
cache.removeValue(forKey: leastRecentlyUsedKey)
accessOrder.removeFirst()
}
}
} else {
cache.removeValue(forKey: key)
accessOrder.removeAll(where: { $0 == key })
}
}
}
}
// Example usage:
let cache = Cache<String, Int>(capacity: 3)
cache["a"] = 1
cache["b"] = 2
cache["c"] = 3
print(cache["a"]) // Output: Optional(1)
print(cache["b"]) // Output: Optional(2)
print(cache["c"]) // Output: Optional(3)
cache["d"] = 4 // "a" is evicted
print(cache["a"]) // Output: nil
print(cache["b"]) // Output: Optional(2)
print(cache["c"]) // Output: Optional(3)
print(cache["d"]) // Output: 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 }
}
class Cache<Key: Hashable, Element>: CacheProtocol {
private var capacity: Int
private var cache: [Key: Element]
private var accessOrder: [Key]
init(capacity: Int) {
self.capacity = capacity
self.cache = [:]
self.accessOrder = []
}
subscript(key: Key) -> Element? {
get {
if let value = cache[key] {
updateAccessOrder(for: key)
return value
}
return nil
}
set {
if let value = newValue {
cache[key] = value
updateAccessOrder(for: key)
if cache.count > capacity {
removeLeastRecentlyUsed()
}
} else {
cache.removeValue(forKey: key)
accessOrder.removeAll(where: { $0 == key })
}
}
}
private func updateAccessOrder(for key: Key) {
if let index = accessOrder.firstIndex(of: key) {
accessOrder.remove(at: index)
}
accessOrder.append(key)
}
private func removeLeastRecentlyUsed() {
if let leastRecentlyUsedKey = accessOrder.first {
cache.removeValue(forKey: leastRecentlyUsedKey)
accessOrder.removeFirst()
}
}
}```swift
protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
// Generic in-memory cache that follows to the LRU (Least Recently Used) eviction policy.
// The cache should have a specified capacity limit, and when this limit is reached, it should remove the least recently used item to make space for new entries.
class Cache<Key: Hashable, Element>: CacheProtocol {
private var capacity: Int
private var cache: [Key: Element]
private var accessOrder: [Key]
init(capacity: Int) {
self.capacity = capacity
self.cache = [:]
self.accessOrder = []
}
subscript(key: Key) -> Element? {
get {
if let value = cache[key] {
updateAccessOrder(for: key)
return value
}
return nil
}
set {
if let value = newValue {
cache[key] = value
updateAccessOrder(for: key)
if cache.count > capacity {
removeLeastRecentlyUsed()
}
} else {
cache.removeValue(forKey: key)
accessOrder.removeAll(where: { $0 == key })
}
}
}
private func updateAccessOrder(for key: Key) {
if let index = accessOrder.firstIndex(of: key) {
accessOrder.remove(at: index)
}
accessOrder.append(key)
}
private func removeLeastRecentlyUsed() {
if let leastRecentlyUsedKey = accessOrder.first {
cache.removeValue(forKey: leastRecentlyUsedKey)
accessOrder.removeFirst()
}
}
}
// Example usage:
let cache = Cache<String, Int>(capacity: 3)
cache["a"] = 1
cache["b"] = 2
cache["c"] = 3
print(cache["a"]) // Output: Optional(1)
print(cache["b"]) // Output: Optional(2)
print(cache["c"]) // Output: Optional(3)
cache["d"] = 4 // "a" is evicted
print(cache["a"]) // Output: nil
print(cache["b"]) // Output: Optional(2)
print(cache["c"]) // Output: Optional(3)
print(cache["d"]) // Output: 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 }
}
class Cache<Key: Hashable, Element>: CacheProtocol {
private var capacity: Int
private var cache: [Key: Element]
private var accessOrder: [Key]
init(capacity: Int) {
self.capacity = capacity
self.cache = [:]
self.accessOrder = []
}
subscript(key: Key) -> Element? {
get {
if let element = cache[key] {
updateAccessOrder(for: key)
return element
}
return nil
}
set {
if let newValue = newValue {
cache[key] = newValue
updateAccessOrder(for: key)
if cache.count > capacity {
removeLeastRecentlyUsed()
}
} else {
cache.removeValue(forKey: key)
accessOrder.removeAll(where: { $0 == key })
}
}
}
private func updateAccessOrder(for key: Key) {
if let index = accessOrder.firstIndex(of: key) {
accessOrder.remove(at: index)
}
accessOrder.append(key)
}
private func removeLeastRecentlyUsed() {
if let leastRecentlyUsedKey = accessOrder.first {
cache.removeValue(forKey: leastRecentlyUsedKey)
accessOrder.removeFirst()
}
}
}```swift
protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
// Generic in-memory cache that follows to the LRU (Least Recently Used) eviction policy.
// The cache should have a specified capacity limit, and when this limit is reached, it should remove the least recently used item to make space for new entries.
class Cache<Key: Hashable, Element>: CacheProtocol {
private var capacity: Int
private var cache: [Key: Element]
private var accessOrder: [Key]
init(capacity: Int) {
self.capacity = capacity
self.cache = [:]
self.accessOrder = []
}
subscript(key: Key) -> Element? {
get {
if let element = cache[key] {
updateAccessOrder(for: key)
return element
}
return nil
}
set {
if let newValue = newValue {
cache[key] = newValue
updateAccessOrder(for: key)
if cache.count > capacity {
removeLeastRecentlyUsed()
}
} else {
cache.removeValue(forKey: key)
accessOrder.removeAll(where: { $0 == key })
}
}
}
private func updateAccessOrder(for key: Key) {
if let index = accessOrder.firstIndex(of: key) {
accessOrder.remove(at: index)
}
accessOrder.append(key)
}
private func removeLeastRecentlyUsed() {
if let leastRecentlyUsedKey = accessOrder.first {
cache.removeValue(forKey: leastRecentlyUsedKey)
accessOrder.removeFirst()
}
}
}
// Example usage:
let cache = Cache<String, Int>(capacity: 3)
cache["a"] = 1
cache["b"] = 2
cache["c"] = 3
print(cache["a"]) // Output: Optional(1)
print(cache["b"]) // Output: Optional(2)
print(cache["c"]) // Output: Optional(3)
cache["d"] = 4 // "a" is evicted
print(cache["a"]) // Output: nil
print(cache["b"]) // Output: Optional(2)
print(cache["c"]) // Output: Optional(3)
print(cache["d"]) // Output: 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 }
}
class Cache<Key: Hashable, Element>: CacheProtocol {
private var capacity: Int
private var cache: [Key: Element]
private var accessOrder: [Key]
init(capacity: Int) {
self.capacity = capacity
self.cache = [:]
self.accessOrder = []
}
subscript(key: Key) -> Element? {
get {
if let value = cache[key] {
updateAccessOrder(for: key)
return value
}
return nil
}
set {
if let value = newValue {
cache[key] = value
updateAccessOrder(for: key)
if cache.count > capacity {
removeLeastRecentlyUsed()
}
} else {
cache.removeValue(forKey: key)
accessOrder.removeAll { $0 == key }
}
}
}
private func updateAccessOrder(for key: Key) {
if let index = accessOrder.firstIndex(of: key) {
accessOrder.remove(at: index)
}
accessOrder.append(key)
}
private func removeLeastRecentlyUsed() {
if let leastRecentlyUsedKey = accessOrder.first {
cache.removeValue(forKey: leastRecentlyUsedKey)
accessOrder.removeFirst()
}
}
}```swift
protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
// Generic in-memory cache that follows to the LRU (Least Recently Used) eviction policy.
// The cache should have a specified capacity limit, and when this limit is reached, it should remove the least recently used item to make space for new entries.
class Cache<Key: Hashable, Element>: CacheProtocol {
private var capacity: Int
private var cache: [Key: Element]
private var accessOrder: [Key]
init(capacity: Int) {
self.capacity = capacity
self.cache = [:]
self.accessOrder = []
}
subscript(key: Key) -> Element? {
get {
if let value = cache[key] {
updateAccessOrder(for: key)
return value
}
return nil
}
set {
if let value = newValue {
cache[key] = value
updateAccessOrder(for: key)
if cache.count > capacity {
removeLeastRecentlyUsed()
}
} else {
cache.removeValue(forKey: key)
accessOrder.removeAll { $0 == key }
}
}
}
private func updateAccessOrder(for key: Key) {
if let index = accessOrder.firstIndex(of: key) {
accessOrder.remove(at: index)
}
accessOrder.append(key)
}
private func removeLeastRecentlyUsed() {
if let leastRecentlyUsedKey = accessOrder.first {
cache.removeValue(forKey: leastRecentlyUsedKey)
accessOrder.removeFirst()
}
}
}
// Example usage:
let cache = Cache<String, Int>(capacity: 3)
cache["a"] = 1
cache["b"] = 2
cache["c"] = 3
print(cache["a"]) // Output: Optional(1)
print(cache["b"]) // Output: Optional(2)
print(cache["c"]) // Output: Optional(3)
cache["d"] = 4 // "a" is evicted because it's the least recently used
print(cache["a"]) // Output: nil
print(cache["b"]) // Output: Optional(2)
print(cache["c"]) // Output: Optional(3)
print(cache["d"]) // Output: 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 }
}
class Cache<Key: Hashable, Element>: CacheProtocol {
private var capacity: Int
private var cache: [Key: Element]
private var accessOrder: [Key]
init(capacity: Int) {
self.capacity = capacity
self.cache = [:]
self.accessOrder = []
}
subscript(key: Key) -> Element? {
get {
if let value = cache[key] {
updateAccessOrder(for: key)
return value
}
return nil
}
set {
if let value = newValue {
cache[key] = value
updateAccessOrder(for: key)
if cache.count > capacity {
removeLeastRecentlyUsed()
}
} else {
cache.removeValue(forKey: key)
accessOrder.removeAll(where: { $0 == key })
}
}
}
private func updateAccessOrder(for key: Key) {
if let index = accessOrder.firstIndex(of: key) {
accessOrder.remove(at: index)
}
accessOrder.append(key)
}
private func removeLeastRecentlyUsed() {
if let leastRecentlyUsedKey = accessOrder.first {
cache.removeValue(forKey: leastRecentlyUsedKey)
accessOrder.removeFirst()
}
}
}```swift
protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
// Generic in-memory cache that follows to the LRU (Least Recently Used) eviction policy.
// The cache should have a specified capacity limit, and when this limit is reached, it should remove the least recently used item to make space for new entries.
class Cache<Key: Hashable, Element>: CacheProtocol {
private var capacity: Int
private var cache: [Key: Element]
private var accessOrder: [Key]
init(capacity: Int) {
self.capacity = capacity
self.cache = [:]
self.accessOrder = []
}
subscript(key: Key) -> Element? {
get {
if let value = cache[key] {
updateAccessOrder(for: key)
return value
}
return nil
}
set {
if let value = newValue {
cache[key] = value
updateAccessOrder(for: key)
if cache.count > capacity {
removeLeastRecentlyUsed()
}
} else {
cache.removeValue(forKey: key)
accessOrder.removeAll(where: { $0 == key })
}
}
}
private func updateAccessOrder(for key: Key) {
if let index = accessOrder.firstIndex(of: key) {
accessOrder.remove(at: index)
}
accessOrder.append(key)
}
private func removeLeastRecentlyUsed() {
if let leastRecentlyUsedKey = accessOrder.first {
cache.removeValue(forKey: leastRecentlyUsedKey)
accessOrder.removeFirst()
}
}
}
// Example usage:
let cache = Cache<String, Int>(capacity: 3)
cache["a"] = 1
cache["b"] = 2
cache["c"] = 3
print(cache["a"]) // Output: Optional(1)
print(cache["b"]) // Output: Optional(2)
print(cache["c"]) // Output: Optional(3)
cache["d"] = 4 // "a" is removed because it's the least recently used
print(cache["a"]) // Output: nil
print(cache["b"]) // Output: Optional(2)
print(cache["c"]) // Output: Optional(3)
print(cache["d"]) // Output: 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 }
}
class Cache<Key: Hashable, Element>: CacheProtocol {
private var capacity: Int
private var cache: [Key: Element]
private var accessOrder: [Key]
required init(capacity: Int) {
self.capacity = capacity
self.cache = [:]
self.accessOrder = []
}
subscript(key: Key) -> Element? {
get {
if let value = cache[key] {
updateAccessOrder(key)
return value
}
return nil
}
set {
if let value = newValue {
cache[key] = value
updateAccessOrder(key)
if cache.count > capacity {
removeLeastRecentlyUsed()
}
} else {
cache.removeValue(forKey: key)
accessOrder.removeAll(where: { $0 == key })
}
}
}
private func updateAccessOrder(_ key: Key) {
if let index = accessOrder.firstIndex(of: key) {
accessOrder.remove(at: index)
}
accessOrder.append(key)
}
private func removeLeastRecentlyUsed() {
if let leastRecentlyUsedKey = accessOrder.first {
cache.removeValue(forKey: leastRecentlyUsedKey)
accessOrder.removeFirst()
}
}
}```swift
protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
// Generic in-memory cache that follows to the LRU (Least Recently Used) eviction policy.
// The cache should have a specified capacity limit, and when this limit is reached, it should remove the least recently used item to make space for new entries.
class Cache<Key: Hashable, Element>: CacheProtocol {
private var capacity: Int
private var cache: [Key: Element]
private var accessOrder: [Key]
required init(capacity: Int) {
self.capacity = capacity
self.cache = [:]
self.accessOrder = []
}
subscript(key: Key) -> Element? {
get {
if let value = cache[key] {
updateAccessOrder(key)
return value
}
return nil
}
set {
if let value = newValue {
cache[key] = value
updateAccessOrder(key)
if cache.count > capacity {
removeLeastRecentlyUsed()
}
} else {
cache.removeValue(forKey: key)
accessOrder.removeAll(where: { $0 == key })
}
}
}
private func updateAccessOrder(_ key: Key) {
if let index = accessOrder.firstIndex(of: key) {
accessOrder.remove(at: index)
}
accessOrder.append(key)
}
private func removeLeastRecentlyUsed() {
if let leastRecentlyUsedKey = accessOrder.first {
cache.removeValue(forKey: leastRecentlyUsedKey)
accessOrder.removeFirst()
}
}
}
// Example usage:
let cache = Cache<String, Int>(capacity: 3)
cache["a"] = 1
cache["b"] = 2
cache["c"] = 3
print(cache["a"]) // Output: Optional(1)
print(cache["b"]) // Output: Optional(2)
print(cache["c"]) // Output: Optional(3)
cache["d"] = 4 // "a" is the least recently used and will be removed
print(cache["a"]) // Output: nil
print(cache["b"]) // Output: Optional(2)
print(cache["c"]) // Output: Optional(3)
print(cache["d"]) // Output: Optional(4)
```protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
class Cache<Key: Hashable, Element>: CacheProtocol {
private var capacity: Int
private var cache: [Key: Element]
private var usageOrder: [Key]
required init(capacity: Int) {
self.capacity = capacity
self.cache = [:]
self.usageOrder = []
}
subscript(key: Key) -> Element? {
get {
if let value = cache[key] {
updateUsage(key)
return value
}
return nil
}
set {
if let value = newValue {
cache[key] = value
updateUsage(key)
if cache.count > capacity {
removeLeastRecentlyUsed()
}
} else {
cache.removeValue(forKey: key)
usageOrder.removeAll(where: { $0 == key })
}
}
}
private func updateUsage(_ key: Key) {
if let index = usageOrder.firstIndex(of: key) {
usageOrder.remove(at: index)
}
usageOrder.append(key)
}
private func removeLeastRecentlyUsed() {
if let leastUsedKey = usageOrder.first {
cache.removeValue(forKey: leastUsedKey)
usageOrder.removeFirst()
}
}
}```swift
protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
// Generic in-memory cache that follows to the LRU (Least Recently Used) eviction policy.
// The cache should have a specified capacity limit, and when this limit is reached, it should remove the least recently used item to make space for new entries.
class Cache<Key: Hashable, Element>: CacheProtocol {
private var capacity: Int
private var cache: [Key: Element]
private var usageOrder: [Key]
required init(capacity: Int) {
self.capacity = capacity
self.cache = [:]
self.usageOrder = []
}
subscript(key: Key) -> Element? {
get {
if let value = cache[key] {
updateUsage(key)
return value
}
return nil
}
set {
if let value = newValue {
cache[key] = value
updateUsage(key)
if cache.count > capacity {
removeLeastRecentlyUsed()
}
} else {
cache.removeValue(forKey: key)
usageOrder.removeAll(where: { $0 == key })
}
}
}
private func updateUsage(_ key: Key) {
if let index = usageOrder.firstIndex(of: key) {
usageOrder.remove(at: index)
}
usageOrder.append(key)
}
private func removeLeastRecentlyUsed() {
if let leastUsedKey = usageOrder.first {
cache.removeValue(forKey: leastUsedKey)
usageOrder.removeFirst()
}
}
}
// Example usage:
let cache = Cache<String, Int>(capacity: 3)
cache["a"] = 1
cache["b"] = 2
cache["c"] = 3
print(cache["a"]) // Output: Optional(1)
print(cache["b"]) // Output: Optional(2)
print(cache["c"]) // Output: Optional(3)
cache["d"] = 4 // "a" is evicted
print(cache["a"]) // Output: nil
print(cache["b"]) // Output: Optional(2)
print(cache["c"]) // Output: Optional(3)
print(cache["d"]) // Output: Optional(4)
```protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
class Cache<Key: Hashable, Element>: CacheProtocol {
private var capacity: Int
private var cache: [Key: Element]
private var accessOrder: [Key]
required init(capacity: Int) {
self.capacity = capacity
self.cache = [:]
self.accessOrder = []
}
subscript(key: Key) -> Element? {
get {
if let value = cache[key] {
updateAccessOrder(for: key)
return value
}
return nil
}
set {
if let value = newValue {
cache[key] = value
updateAccessOrder(for: key)
if cache.count > capacity {
removeLeastRecentlyUsed()
}
} else {
cache.removeValue(forKey: key)
accessOrder.removeAll(where: { $0 == key })
}
}
}
private func updateAccessOrder(for key: Key) {
if let index = accessOrder.firstIndex(of: key) {
accessOrder.remove(at: index)
}
accessOrder.append(key)
}
private func removeLeastRecentlyUsed() {
if let leastRecentlyUsedKey = accessOrder.first {
cache.removeValue(forKey: leastRecentlyUsedKey)
accessOrder.removeFirst()
}
}
}```swift
protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
// Generic in-memory cache that follows to the LRU (Least Recently Used) eviction policy.
// The cache should have a specified capacity limit, and when this limit is reached, it should remove the least recently used item to make space for new entries.
class Cache<Key: Hashable, Element>: CacheProtocol {
private var capacity: Int
private var cache: [Key: Element]
private var accessOrder: [Key]
required init(capacity: Int) {
self.capacity = capacity
self.cache = [:]
self.accessOrder = []
}
subscript(key: Key) -> Element? {
get {
if let value = cache[key] {
updateAccessOrder(for: key)
return value
}
return nil
}
set {
if let value = newValue {
cache[key] = value
updateAccessOrder(for: key)
if cache.count > capacity {
removeLeastRecentlyUsed()
}
} else {
cache.removeValue(forKey: key)
accessOrder.removeAll(where: { $0 == key })
}
}
}
private func updateAccessOrder(for key: Key) {
if let index = accessOrder.firstIndex(of: key) {
accessOrder.remove(at: index)
}
accessOrder.append(key)
}
private func removeLeastRecentlyUsed() {
if let leastRecentlyUsedKey = accessOrder.first {
cache.removeValue(forKey: leastRecentlyUsedKey)
accessOrder.removeFirst()
}
}
}
// Example usage:
let cache = Cache<String, Int>(capacity: 3)
cache["a"] = 1
cache["b"] = 2
cache["c"] = 3
print(cache["a"]) // Output: Optional(1)
print(cache["b"]) // Output: Optional(2)
print(cache["c"]) // Output: Optional(3)
cache["d"] = 4 // "a" is evicted
print(cache["a"]) // Output: nil
print(cache["b"]) // Output: Optional(2)
print(cache["c"]) // Output: Optional(3)
print(cache["d"]) // Output: Optional(4)
```protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
class Cache<Key: Hashable, Element>: CacheProtocol {
private var capacity: Int
private var cache: [Key: Element]
private var accessOrder: [Key]
required init(capacity: Int) {
self.capacity = capacity
self.cache = [:]
self.accessOrder = []
}
subscript(key: Key) -> Element? {
get {
if let value = cache[key] {
accessOrder.removeAll(where: { $0 == key })
accessOrder.append(key)
return value
}
return nil
}
set {
if let value = newValue {
cache[key] = value
accessOrder.removeAll(where: { $0 == key })
accessOrder.append(key)
if cache.count > capacity {
let leastRecentlyUsed = accessOrder.removeFirst()
cache.removeValue(forKey: leastRecentlyUsed)
}
} else {
cache.removeValue(forKey: key)
accessOrder.removeAll(where: { $0 == key })
}
}
}
}```swift
protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
// Generic in-memory cache that follows to the LRU (Least Recently Used) eviction policy.
// The cache should have a specified capacity limit, and when this limit is reached, it should remove the least recently used item to make space for new entries.
class Cache<Key: Hashable, Element>: CacheProtocol {
private var capacity: Int
private var cache: [Key: Element]
private var accessOrder: [Key]
required init(capacity: Int) {
self.capacity = capacity
self.cache = [:]
self.accessOrder = []
}
subscript(key: Key) -> Element? {
get {
if let value = cache[key] {
accessOrder.removeAll(where: { $0 == key })
accessOrder.append(key)
return value
}
return nil
}
set {
if let value = newValue {
cache[key] = value
accessOrder.removeAll(where: { $0 == key })
accessOrder.append(key)
if cache.count > capacity {
let leastRecentlyUsed = accessOrder.removeFirst()
cache.removeValue(forKey: leastRecentlyUsed)
}
} else {
cache.removeValue(forKey: key)
accessOrder.removeAll(where: { $0 == key })
}
}
}
}
// Example usage:
let cache = Cache<String, Int>(capacity: 3)
cache["a"] = 1
cache["b"] = 2
cache["c"] = 3
print(cache["a"]) // Output: Optional(1)
print(cache["b"]) // Output: Optional(2)
print(cache["c"]) // Output: Optional(3)
cache["d"] = 4 // "a" is evicted
print(cache["a"]) // Output: nil
print(cache["b"]) // Output: Optional(2)
print(cache["c"]) // Output: Optional(3)
print(cache["d"]) // Output: Optional(4)
```protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
class Cache<Key: Hashable, Element>: CacheProtocol {
private var capacity: Int
private var cache: [Key: Element]
private var accessOrder: [Key]
required init(capacity: Int) {
self.capacity = capacity
self.cache = [:]
self.accessOrder = []
}
subscript(key: Key) -> Element? {
get {
if let value = cache[key] {
updateAccessOrder(for: key)
return value
}
return nil
}
set {
if let value = newValue {
cache[key] = value
updateAccessOrder(for: key)
if cache.count > capacity {
removeLeastRecentlyUsed()
}
} else {
cache.removeValue(forKey: key)
accessOrder.removeAll(where: { $0 == key })
}
}
}
private func updateAccessOrder(for key: Key) {
if let index = accessOrder.firstIndex(of: key) {
accessOrder.remove(at: index)
}
accessOrder.append(key)
}
private func removeLeastRecentlyUsed() {
if let leastRecentlyUsed = accessOrder.first {
cache.removeValue(forKey: leastRecentlyUsed)
accessOrder.removeFirst()
}
}
}```swift
protocol CacheProtocol {
associatedtype Key: Hashable
associatedtype Element
init(capacity: Int)
subscript(key: Key) -> Element? { get set }
}
// Generic in-memory cache that follows to the LRU (Least Recently Used) eviction policy.
// The cache should have a specified capacity limit, and when this limit is reached, it should remove the least recently used item to make space for new entries.
class Cache<Key: Hashable, Element>: CacheProtocol {
private var capacity: Int
private var cache: [Key: Element]
private var accessOrder: [Key]
required init(capacity: Int) {
self.capacity = capacity
self.cache = [:]
self.accessOrder = []
}
subscript(key: Key) -> Element? {
get {
if let value = cache[key] {
updateAccessOrder(for: key)
return value
}
return nil
}
set {
if let value = newValue {
cache[key] = value
updateAccessOrder(for: key)
if cache.count > capacity {
removeLeastRecentlyUsed()
}
} else {
cache.removeValue(forKey: key)
accessOrder.removeAll(where: { $0 == key })
}
}
}
private func updateAccessOrder(for key: Key) {
if let index = accessOrder.firstIndex(of: key) {
accessOrder.remove(at: index)
}
accessOrder.append(key)
}
private func removeLeastRecentlyUsed() {
if let leastRecentlyUsed = accessOrder.first {
cache.removeValue(forKey: leastRecentlyUsed)
accessOrder.removeFirst()
}
}
}
// Example usage:
let cache = Cache<String, Int>(capacity: 3)
cache["a"] = 1
cache["b"] = 2
cache["c"] = 3
print(cache["a"]) // Output: Optional(1)
print(cache["b"]) // Output: Optional(2)
print(cache["c"]) // Output: Optional(3)
cache["d"] = 4 // "a" is removed because it's the least recently used
print(cache["a"]) // Output: nil
print(cache["b"]) // Output: Optional(2)
print(cache["c"]) // Output: Optional(3)
print(cache["d"]) // Output: Optional(4)
```protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache = [Key: (Value, Date)]()
func put(value: Value, key: Key, expiration: TimeInterval) {
let expirationDate = Date(timeIntervalSinceNow: expiration)
cache[key] = (value, expirationDate)
}
func get(key: Key) -> Value? {
guard let (value, expirationDate) = cache[key], Date() < expirationDate else {
cache.removeValue(forKey: key)
return nil
}
return value
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
if let value = newValue {
put(value: value, key: key, expiration: 0)
} else {
cache.removeValue(forKey: key)
}
}
}
}```swift
protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
// Caching mechanism with expiration eviction policy.
// Subscript methods used for convenient access.
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache = [Key: (Value, Date)]()
func put(value: Value, key: Key, expiration: TimeInterval) {
let expirationDate = Date(timeIntervalSinceNow: expiration)
cache[key] = (value, expirationDate)
}
func get(key: Key) -> Value? {
guard let (value, expirationDate) = cache[key], Date() < expirationDate else {
cache.removeValue(forKey: key)
return nil
}
return value
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
if let value = newValue {
put(value: value, key: key, expiration: 0)
} else {
cache.removeValue(forKey: key)
}
}
}
}
// Example usage:
let cache = ExpirableCache<String, Int>()
cache["apple"] = 5 // Set the value with no expiration
cache["banana"] = 3 // Set the value with no expiration
cache["cherry"] = 2 // Set the value with no expiration
print(cache["apple"]) // Output: Optional(5)
print(cache["banana"]) // Output: Optional(3)
print(cache["cherry"]) // Output: Optional(2)
sleep(2) // Wait for 2 seconds
print(cache["apple"]) // Output: nil (expired)
print(cache["banana"]) // Output: nil (expired)
print(cache["cherry"]) // Output: Optional(2)
```Thread.sleep(forTimeInterval: 1.1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6Thread.sleep(forTimeInterval: 0.9) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache = [Key: (value: Value, expiration: Date)]()
func put(value: Value, key: Key, expiration: TimeInterval) {
let expirationDate = Date(timeIntervalSinceNow: expiration)
cache[key] = (value, expirationDate)
}
func get(key: Key) -> Value? {
guard let (value, expiration) = cache[key], expiration > Date() else {
cache.removeValue(forKey: key)
return nil
}
return value
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
if let value = newValue {
put(value: value, key: key, expiration: 0)
} else {
cache.removeValue(forKey: key)
}
}
}
}```swift
protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
// Caching mechanism with expiration eviction policy.
// Subscript methods used for convenient access.
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache = [Key: (value: Value, expiration: Date)]()
func put(value: Value, key: Key, expiration: TimeInterval) {
let expirationDate = Date(timeIntervalSinceNow: expiration)
cache[key] = (value, expirationDate)
}
func get(key: Key) -> Value? {
guard let (value, expiration) = cache[key], expiration > Date() else {
cache.removeValue(forKey: key)
return nil
}
return value
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
if let value = newValue {
put(value: value, key: key, expiration: 0)
} else {
cache.removeValue(forKey: key)
}
}
}
}
// Example usage:
let cache = ExpirableCache<String, String>()
cache["apple"] = "fruit"
cache["carrot"] = "vegetable"
cache.put(value: "meat", key: "pork", expiration: 10)
print(cache["apple"]) // Output: Optional("fruit")
print(cache["carrot"]) // Output: Optional("vegetable")
print(cache["pork"]) // Output: Optional("meat")
sleep(11) // Wait for 11 seconds to simulate expiration
print(cache["apple"]) // Output: Optional("fruit")
print(cache["carrot"]) // Output: Optional("vegetable")
print(cache["pork"]) // Output: nil
```Thread.sleep(forTimeInterval: 1.1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6Thread.sleep(forTimeInterval: 0.9) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache: [Key: (value: Value, expiration: Date)] = [:]
func put(value: Value, key: Key, expiration: TimeInterval) {
let expirationDate = Date(timeIntervalSinceNow: expiration)
cache[key] = (value, expirationDate)
}
func get(key: Key) -> Value? {
guard let (value, expiration) = cache[key], Date() < expiration else {
cache.removeValue(forKey: key)
return nil
}
return value
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
if let value = newValue {
put(value: value, key: key, expiration: 0)
} else {
cache.removeValue(forKey: key)
}
}
}
}```swift
protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
// Caching mechanism with expiration eviction policy.
// Subscript methods used for convenient access.
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache: [Key: (value: Value, expiration: Date)] = [:]
func put(value: Value, key: Key, expiration: TimeInterval) {
let expirationDate = Date(timeIntervalSinceNow: expiration)
cache[key] = (value, expirationDate)
}
func get(key: Key) -> Value? {
guard let (value, expiration) = cache[key], Date() < expiration else {
cache.removeValue(forKey: key)
return nil
}
return value
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
if let value = newValue {
put(value: value, key: key, expiration: 0)
} else {
cache.removeValue(forKey: key)
}
}
}
}
// Example usage:
let cache = ExpirableCache<String, String>()
cache["key1"] = "value1"
cache["key2"] = "value2"
cache.put(value: "value3", key: "key3", expiration: 1)
print(cache["key1"]) // Output: Optional("value1")
print(cache["key2"]) // Output: Optional("value2")
print(cache["key3"]) // Output: Optional("value3")
sleep(2) // Wait for 2 seconds to simulate expiration
print(cache["key1"]) // Output: nil
print(cache["key2"]) // Output: nil
print(cache["key3"]) // Output: nil
```Thread.sleep(forTimeInterval: 1.1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6Thread.sleep(forTimeInterval: 0.9) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache: [Key: (value: Value, expiration: Date)] = [:]
func put(value: Value, key: Key, expiration: TimeInterval) {
let expirationDate = Date(timeIntervalSinceNow: expiration)
cache[key] = (value, expirationDate)
}
func get(key: Key) -> Value? {
guard let (value, expiration) = cache[key], Date() < expiration else {
cache.removeValue(forKey: key)
return nil
}
return value
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
if let value = newValue {
put(value: value, key: key, expiration: 0)
} else {
cache.removeValue(forKey: key)
}
}
}
}```swift
protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
// Caching mechanism with expiration eviction policy.
// Subscript methods used for convenient access.
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache: [Key: (value: Value, expiration: Date)] = [:]
func put(value: Value, key: Key, expiration: TimeInterval) {
let expirationDate = Date(timeIntervalSinceNow: expiration)
cache[key] = (value, expirationDate)
}
func get(key: Key) -> Value? {
guard let (value, expiration) = cache[key], Date() < expiration else {
cache.removeValue(forKey: key)
return nil
}
return value
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
if let value = newValue {
put(value: value, key: key, expiration: 0)
} else {
cache.removeValue(forKey: key)
}
}
}
}
// Example usage:
let cache = ExpirableCache<String, String>()
cache["key1"] = "value1"
cache["key2"] = "value2"
cache.put(value: "value3", key: "key3", expiration: 5)
print(cache["key1"]) // Output: Optional("value1")
print(cache["key2"]) // Output: Optional("value2")
print(cache["key3"]) // Output: Optional("value3")
sleep(6) // Wait for 6 seconds to simulate expiration
print(cache["key1"]) // Output: nil
print(cache["key2"]) // Output: nil
print(cache["key3"]) // Output: nil
```Thread.sleep(forTimeInterval: 1.1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6Thread.sleep(forTimeInterval: 0.9) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache = [Key: (value: Value, expiration: Date)]()
func put(value: Value, key: Key, expiration: TimeInterval) {
let expirationDate = Date(timeIntervalSinceNow: expiration)
cache[key] = (value, expirationDate)
}
func get(key: Key) -> Value? {
guard let (value, expiration) = cache[key], Date() < expiration else {
cache.removeValue(forKey: key)
return nil
}
return value
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
if let newValue = newValue {
put(value: newValue, key: key, expiration: 0)
} else {
cache.removeValue(forKey: key)
}
}
}
}```swift
protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
// Caching mechanism with expiration eviction policy.
// Subscript methods used for convenient access.
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache = [Key: (value: Value, expiration: Date)]()
func put(value: Value, key: Key, expiration: TimeInterval) {
let expirationDate = Date(timeIntervalSinceNow: expiration)
cache[key] = (value, expirationDate)
}
func get(key: Key) -> Value? {
guard let (value, expiration) = cache[key], Date() < expiration else {
cache.removeValue(forKey: key)
return nil
}
return value
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
if let newValue = newValue {
put(value: newValue, key: key, expiration: 0)
} else {
cache.removeValue(forKey: key)
}
}
}
}
// Example usage:
let cache = ExpirableCache<String, String>()
cache["key1"] = "value1"
cache["key2"] = "value2"
cache.put(value: "value3", key: "key3", expiration: 1)
print(cache["key1"]) // Output: Optional("value1")
print(cache["key2"]) // Output: Optional("value2")
print(cache["key3"]) // Output: Optional("value3")
sleep(2) // Wait for 2 seconds to simulate expiration
print(cache["key1"]) // Output: nil
print(cache["key2"]) // Output: nil
print(cache["key3"]) // Output: nil
```Thread.sleep(forTimeInterval: 1.1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6Thread.sleep(forTimeInterval: 0.9) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache: [Key: (value: Value, expiration: Date)] = [:]
func put(value: Value, key: Key, expiration: TimeInterval) {
let expirationDate = Date(timeIntervalSinceNow: expiration)
cache[key] = (value, expirationDate)
}
func get(key: Key) -> Value? {
guard let (value, expiration) = cache[key], Date() < expiration else {
cache.removeValue(forKey: key)
return nil
}
return value
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
if let newValue = newValue {
put(value: newValue, key: key, expiration: 0)
} else {
cache.removeValue(forKey: key)
}
}
}
}```swift
protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
// Caching mechanism with expiration eviction policy.
// Subscript methods used for convenient access.
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache: [Key: (value: Value, expiration: Date)] = [:]
func put(value: Value, key: Key, expiration: TimeInterval) {
let expirationDate = Date(timeIntervalSinceNow: expiration)
cache[key] = (value, expirationDate)
}
func get(key: Key) -> Value? {
guard let (value, expiration) = cache[key], Date() < expiration else {
cache.removeValue(forKey: key)
return nil
}
return value
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
if let newValue = newValue {
put(value: newValue, key: key, expiration: 0)
} else {
cache.removeValue(forKey: key)
}
}
}
}
// Example usage:
let cache = ExpirableCache<String, String>()
cache["key1"] = "value1"
cache.put(value: "value2", key: "key2", expiration: 5)
print(cache["key1"]) // Output: Optional("value1")
print(cache["key2"]) // Output: Optional("value2")
sleep(6) // Wait for 6 seconds to simulate expiration
print(cache["key1"]) // Output: nil
print(cache["key2"]) // Output: nil
```Thread.sleep(forTimeInterval: 1.1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6Thread.sleep(forTimeInterval: 0.9) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache = [Key: (value: Value, expiration: Date)]()
func put(value: Value, key: Key, expiration: TimeInterval) {
let expirationDate = Date(timeIntervalSinceNow: expiration)
cache[key] = (value, expirationDate)
}
func get(key: Key) -> Value? {
guard let (value, expiration) = cache[key], Date() < expiration else {
cache.removeValue(forKey: key)
return nil
}
return value
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
if let newValue = newValue {
put(value: newValue, key: key, expiration: 0)
} else {
cache.removeValue(forKey: key)
}
}
}
}```swift
protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
// Caching mechanism with expiration eviction policy.
// Subscript methods used for convenient access.
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache = [Key: (value: Value, expiration: Date)]()
func put(value: Value, key: Key, expiration: TimeInterval) {
let expirationDate = Date(timeIntervalSinceNow: expiration)
cache[key] = (value, expirationDate)
}
func get(key: Key) -> Value? {
guard let (value, expiration) = cache[key], Date() < expiration else {
cache.removeValue(forKey: key)
return nil
}
return value
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
if let newValue = newValue {
put(value: newValue, key: key, expiration: 0)
} else {
cache.removeValue(forKey: key)
}
}
}
}
// Example usage:
let cache = ExpirableCache<String, Int>()
cache["a"] = 1
cache["b"] = 2
cache["c"] = 3
print(cache["a"]) // Output: Optional(1)
print(cache["b"]) // Output: Optional(2)
print(cache["c"]) // Output: Optional(3)
sleep(2) // Wait for 2 seconds
print(cache["a"]) // Output: nil
print(cache["b"]) // Output: nil
print(cache["c"]) // Output: Optional(3)
```Thread.sleep(forTimeInterval: 1.1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6Thread.sleep(forTimeInterval: 0.9) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache: [Key: (value: Value, expiration: Date)] = [:]
func put(value: Value, key: Key, expiration: TimeInterval) {
let expirationDate = Date(timeIntervalSinceNow: expiration)
cache[key] = (value, expirationDate)
}
func get(key: Key) -> Value? {
guard let (value, expiration) = cache[key], Date() < expiration else {
cache.removeValue(forKey: key)
return nil
}
return value
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
if let value = newValue {
put(value: value, key: key, expiration: 3600) // Default expiration is 1 hour
} else {
cache.removeValue(forKey: key)
}
}
}
}```swift
protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
// Caching mechanism with expiration eviction policy.
// Subscript methods used for convenient access.
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache: [Key: (value: Value, expiration: Date)] = [:]
func put(value: Value, key: Key, expiration: TimeInterval) {
let expirationDate = Date(timeIntervalSinceNow: expiration)
cache[key] = (value, expirationDate)
}
func get(key: Key) -> Value? {
guard let (value, expiration) = cache[key], Date() < expiration else {
cache.removeValue(forKey: key)
return nil
}
return value
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
if let value = newValue {
put(value: value, key: key, expiration: 3600) // Default expiration is 1 hour
} else {
cache.removeValue(forKey: key)
}
}
}
}
// Example usage:
let cache = ExpirableCache<String, String>()
cache["example_key"] = "example_value" // Sets the value with default expiration
print(cache["example_key"] ?? "nil") // Retrieves the value, should print "example_value"
sleep(2) // Sleep for 2 seconds to allow the value to expire
print(cache["example_key"] ?? "nil") // Retrieves the value after expiration, should print "nil"
```Thread.sleep(forTimeInterval: 1.1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6Thread.sleep(forTimeInterval: 0.9) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache = [Key: (Value, Date)]()
func put(value: Value, key: Key, expiration: TimeInterval) {
let expirationDate = Date(timeIntervalSinceNow: expiration)
cache[key] = (value, expirationDate)
}
func get(key: Key) -> Value? {
guard let (value, expirationDate) = cache[key], Date() < expirationDate else {
cache.removeValue(forKey: key)
return nil
}
return value
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
if let newValue = newValue {
put(value: newValue, key: key, expiration: 0)
} else {
cache.removeValue(forKey: key)
}
}
}
}```swift
protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
// Caching mechanism with expiration eviction policy.
// Subscript methods used for convenient access.
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache = [Key: (Value, Date)]()
func put(value: Value, key: Key, expiration: TimeInterval) {
let expirationDate = Date(timeIntervalSinceNow: expiration)
cache[key] = (value, expirationDate)
}
func get(key: Key) -> Value? {
guard let (value, expirationDate) = cache[key], Date() < expirationDate else {
cache.removeValue(forKey: key)
return nil
}
return value
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
if let newValue = newValue {
put(value: newValue, key: key, expiration: 0)
} else {
cache.removeValue(forKey: key)
}
}
}
}
// Example usage:
let cache = ExpirableCache<String, String>()
cache["key1"] = "value1" // Set value with no expiration
cache["key2"] = "value2", expiration: 1.0 // Set value with expiration of 1 second
sleep(2) // Wait for 2 seconds
print(cache["key2"]) // Output: nil, because the value has expired
```Thread.sleep(forTimeInterval: 1.1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6Thread.sleep(forTimeInterval: 0.9) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache: [Key: (value: Value, expiration: Date)] = [:]
func put(value: Value, key: Key, expiration: TimeInterval) {
let expirationDate = Date(timeIntervalSinceNow: expiration)
cache[key] = (value, expirationDate)
}
func get(key: Key) -> Value? {
guard let (value, expiration) = cache[key], expiration > Date() else {
cache.removeValue(forKey: key)
return nil
}
return value
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
if let value = newValue {
put(value: value, key: key, expiration: 0)
} else {
cache.removeValue(forKey: key)
}
}
}
}```swift
protocol ExpirableCacheProtocol {
associatedtype Key: Hashable
associatedtype Value
func put(value: Value, key: Key, expiration: TimeInterval)
func get(key: Key) -> Value?
}
// Caching mechanism with expiration eviction policy.
// Subscript methods used for convenient access.
class ExpirableCache<Key: Hashable, Value>: ExpirableCacheProtocol {
private var cache: [Key: (value: Value, expiration: Date)] = [:]
func put(value: Value, key: Key, expiration: TimeInterval) {
let expirationDate = Date(timeIntervalSinceNow: expiration)
cache[key] = (value, expirationDate)
}
func get(key: Key) -> Value? {
guard let (value, expiration) = cache[key], expiration > Date() else {
cache.removeValue(forKey: key)
return nil
}
return value
}
subscript(key: Key) -> Value? {
get {
return get(key: key)
}
set {
if let value = newValue {
put(value: value, key: key, expiration: 0)
} else {
cache.removeValue(forKey: key)
}
}
}
}
// Example usage:
let cache = ExpirableCache<String, String>()
cache["apple"] = "fruit"
cache["carrot"] = "vegetable"
cache.put(value: "meat", key: "pork", expiration: 10)
print(cache["apple"]) // Output: Optional("fruit")
print(cache["carrot"]) // Output: Optional("vegetable")
print(cache["pork"]) // Output: Optional("meat")
sleep(11) // Wait for 11 seconds to simulate expiration
print(cache["apple"]) // Output: nil
print(cache["carrot"]) // Output: nil
print(cache["pork"]) // Output: 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)!
var encryptedData = Data()
for (index, char) in string.enumerated() {
let keyChar = keyData[index % keyData.count]
let encryptedChar = char.unicodeScalars.first!.value ^ keyChar.unicodeScalars.first!.value
encryptedData.append(Data(from: UnicodeScalar(encryptedChar)!))
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)!
var decryptedString = ""
for (index, byte) in data.enumerated() {
let keyChar = keyData[index % keyData.count]
let decryptedChar = byte ^ keyChar
decryptedString.append(String(data: Data(from: UnicodeScalar(decryptedChar)!), encoding: .utf8)!)
}
return decryptedString
}
}```swift
protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
// Simple XOR encryptor and decryptor that converts plain text into encrypted text by applying the binary 'Exclusive OR' operator implemented according to the protocol.
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let keyData = key.data(using: .utf8)!
var encryptedData = Data()
for (index, char) in string.enumerated() {
let keyChar = keyData[index % keyData.count]
let encryptedChar = char.unicodeScalars.first!.value ^ keyChar.unicodeScalars.first!.value
encryptedData.append(Data(from: UnicodeScalar(encryptedChar)!))
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)!
var decryptedString = ""
for (index, byte) in data.enumerated() {
let keyChar = keyData[index % keyData.count]
let decryptedChar = byte ^ keyChar
decryptedString.append(String(data: Data(from: UnicodeScalar(decryptedChar)!), encoding: .utf8)!)
}
return decryptedString
}
}
// Example usage:
let encryptor = Encryptor()
let key = "secretkey"
let plainText = "Hello, World!"
let encryptedData = encryptor.encrypt(plainText, key)
let decryptedString = encryptor.decrypt(encryptedData, key)
print("Plain text: \(plainText)")
print("Encrypted data: \(encryptedData)")
print("Decrypted string: \(decryptedString)")
```let encryptedChar = char.unicodeScalars.first!.value ^ keyChar.unicodeScalars.first!.value // value of type 'UInt8' has no member 'unicodeScalars'encryptedData.append(Data(from: UnicodeScalar(encryptedChar)!)) // argument type 'UnicodeScalar' (aka 'Unicode.Scalar') does not conform to expected type 'Decoder'decryptedString.append(String(data: Data(from: UnicodeScalar(decryptedChar)!), encoding: .utf8)!) // argument type 'UnicodeScalar' (aka 'Unicode.Scalar') does not conform to expected type 'Decoder'decryptedString.append(String(data: Data(from: UnicodeScalar(decryptedChar)!), encoding: .utf8)!) // cannot force unwrap value of non-optional type 'UnicodeScalar' (aka 'Unicode.Scalar')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)!
var encryptedData = Data()
for (index, char) in string.enumerated() {
let keyChar = keyData[index % keyData.count]
let encryptedChar = char.unicodeScalars.first!.value ^ keyChar.unicodeScalars.first!.value
encryptedData.append(Data(from: UnicodeScalar(encryptedChar)!))
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)!
var decryptedString = ""
for (index, byte) in data.enumerated() {
let keyChar = keyData[index % keyData.count]
let decryptedChar = byte ^ keyChar
decryptedString.append(String(decoding: [decryptedChar], as: UTF8.self))
}
return decryptedString
}
}
class EncryptorTests {
let encryptor = Encryptor()
func testEncryptDecrypt() {
let plainText = "Hello, World!"
let key = "secret"
let encryptedData = encryptor.encrypt(plainText, key)
let decryptedText = encryptor.decrypt(encryptedData, key)
XCTAssertEqual(plainText, decryptedText)
}
}```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)!
var encryptedData = Data()
for (index, char) in string.enumerated() {
let keyChar = keyData[index % keyData.count]
let encryptedChar = char.unicodeScalars.first!.value ^ keyChar.unicodeScalars.first!.value
encryptedData.append(Data(from: UnicodeScalar(encryptedChar)!))
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)!
var decryptedString = ""
for (index, byte) in data.enumerated() {
let keyChar = keyData[index % keyData.count]
let decryptedChar = byte ^ keyChar
decryptedString.append(String(decoding: [decryptedChar], as: UTF8.self))
}
return decryptedString
}
}
// Unit tests for the Encryptor class.
class EncryptorTests {
let encryptor = Encryptor()
func testEncryptDecrypt() {
let plainText = "Hello, World!"
let key = "secret"
let encryptedData = encryptor.encrypt(plainText, key)
let decryptedText = encryptor.decrypt(encryptedData, key)
XCTAssertEqual(plainText, decryptedText)
}
}
// Run the tests.
let tests = EncryptorTests()
tests.testEncryptDecrypt()
```let encryptedChar = char.unicodeScalars.first!.value ^ keyChar.unicodeScalars.first!.value // value of type 'UInt8' has no member 'unicodeScalars'encryptedData.append(Data(from: UnicodeScalar(encryptedChar)!)) // argument type 'UnicodeScalar' (aka 'Unicode.Scalar') does not conform to expected type 'Decoder'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)!
var encryptedData = Data()
for (index, char) in string.enumerated() {
let keyChar = keyData[index % keyData.count]
let encryptedChar = char.unicodeScalars.first!.value ^ keyChar.unicodeScalars.first!.value
encryptedData.append(Data(from: UnicodeScalar(encryptedChar)!))
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)!
var decryptedString = ""
for (index, byte) in data.enumerated() {
let keyChar = keyData[index % keyData.count]
let decryptedChar = byte ^ keyChar
decryptedString.append(String(decoding: [decryptedChar], as: UTF8.self))
}
return decryptedString
}
}```swift
protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
// Simple XOR encryptor and decryptor that converts plain text into encrypted text by applying the binary 'Exclusive OR' operator implemented according to the protocol.
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let keyData = key.data(using: .utf8)!
var encryptedData = Data()
for (index, char) in string.enumerated() {
let keyChar = keyData[index % keyData.count]
let encryptedChar = char.unicodeScalars.first!.value ^ keyChar.unicodeScalars.first!.value
encryptedData.append(Data(from: UnicodeScalar(encryptedChar)!))
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)!
var decryptedString = ""
for (index, byte) in data.enumerated() {
let keyChar = keyData[index % keyData.count]
let decryptedChar = byte ^ keyChar
decryptedString.append(String(decoding: [decryptedChar], as: UTF8.self))
}
return decryptedString
}
}
// Example usage:
let encryptor = Encryptor()
let key = "secretkey"
let plainText = "Hello, World!"
let encryptedData = encryptor.encrypt(plainText, key)
let decryptedText = encryptor.decrypt(encryptedData, key)
print("Encrypted: \(encryptedData.base64EncodedString())")
print("Decrypted: \(decryptedText)")
```let encryptedChar = char.unicodeScalars.first!.value ^ keyChar.unicodeScalars.first!.value // value of type 'UInt8' has no member 'unicodeScalars'encryptedData.append(Data(from: UnicodeScalar(encryptedChar)!)) // argument type 'UnicodeScalar' (aka 'Unicode.Scalar') does not conform to expected type 'Decoder'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)!
var encryptedData = Data()
for (index, char) in string.enumerated() {
let keyChar = keyData[index % keyData.count]
let encryptedChar = char.unicodeScalars.first!.value ^ keyChar.unicodeScalars.first!.value
encryptedData.append(Data(from: UnicodeScalar(encryptedChar)!))
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)!
var decryptedString = ""
for (index, byte) in data.enumerated() {
let keyChar = keyData[index % keyData.count]
let decryptedChar = byte ^ keyChar
decryptedString.append(String(decoding: [decryptedChar], as: UTF8.self))
}
return decryptedString
}
}```swift
protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
// Simple XOR encryptor and decryptor that converts plain text into encrypted text by applying the binary 'Exclusive OR' operator implemented according to the protocol.
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let keyData = key.data(using: .utf8)!
var encryptedData = Data()
for (index, char) in string.enumerated() {
let keyChar = keyData[index % keyData.count]
let encryptedChar = char.unicodeScalars.first!.value ^ keyChar.unicodeScalars.first!.value
encryptedData.append(Data(from: UnicodeScalar(encryptedChar)!))
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)!
var decryptedString = ""
for (index, byte) in data.enumerated() {
let keyChar = keyData[index % keyData.count]
let decryptedChar = byte ^ keyChar
decryptedString.append(String(decoding: [decryptedChar], as: UTF8.self))
}
return decryptedString
}
}
// Example usage:
let encryptor = Encryptor()
let key = "secretkey"
let plainText = "Hello, World!"
let encryptedData = encryptor.encrypt(plainText, key)
let decryptedString = encryptor.decrypt(encryptedData, key)
print("Plain text: \(plainText)")
print("Encrypted data: \(encryptedData)")
print("Decrypted string: \(decryptedString)")
```let encryptedChar = char.unicodeScalars.first!.value ^ keyChar.unicodeScalars.first!.value // value of type 'UInt8' has no member 'unicodeScalars'encryptedData.append(Data(from: UnicodeScalar(encryptedChar)!)) // argument type 'UnicodeScalar' (aka 'Unicode.Scalar') does not conform to expected type 'Decoder'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)!
var encryptedData = Data()
for (index, char) in string.enumerated() {
let keyChar = keyData[index % keyData.count]
let encryptedChar = char.unicodeScalars.first!.value ^ keyChar.unicodeScalars.first!.value
encryptedData.append(Data(bytes: [UInt8(encryptedChar)]))
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)!
var decryptedString = ""
for (index, byte) in data.enumerated() {
let keyChar = keyData[index % keyData.count]
let decryptedChar = Character(UnicodeScalar(UInt32(byte) ^ keyChar.unicodeScalars.first!.value))
decryptedString.append(decryptedChar)
}
return decryptedString
}
}```swift
protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
// Simple XOR encryptor and decryptor that converts plain text into encrypted text by applying the binary 'Exclusive OR' operator implemented according to the protocol.
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let keyData = key.data(using: .utf8)!
var encryptedData = Data()
for (index, char) in string.enumerated() {
let keyChar = keyData[index % keyData.count]
let encryptedChar = char.unicodeScalars.first!.value ^ keyChar.unicodeScalars.first!.value
encryptedData.append(Data(bytes: [UInt8(encryptedChar)]))
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)!
var decryptedString = ""
for (index, byte) in data.enumerated() {
let keyChar = keyData[index % keyData.count]
let decryptedChar = Character(UnicodeScalar(UInt32(byte) ^ keyChar.unicodeScalars.first!.value))
decryptedString.append(decryptedChar)
}
return decryptedString
}
}
// Example usage:
let encryptor = Encryptor()
let key = "secretkey"
let plainText = "Hello, World!"
let encryptedData = encryptor.encrypt(plainText, key)
let decryptedString = encryptor.decrypt(encryptedData, key)
print("Plain text: \(plainText)")
print("Encrypted data: \(encryptedData.base64EncodedString())")
print("Decrypted string: \(decryptedString)")
```let encryptedChar = char.unicodeScalars.first!.value ^ keyChar.unicodeScalars.first!.value // value of type 'UInt8' has no member 'unicodeScalars'let decryptedChar = Character(UnicodeScalar(UInt32(byte) ^ keyChar.unicodeScalars.first!.value)) // value of optional type 'UnicodeScalar?' (aka 'Optional<Unicode.Scalar>') must be unwrapped to a value of type 'UnicodeScalar' (aka 'Unicode.Scalar')let decryptedChar = Character(UnicodeScalar(UInt32(byte) ^ keyChar.unicodeScalars.first!.value)) // value of type 'UInt8' has no member 'unicodeScalars'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)!
var encryptedData = Data()
for (index, char) in string.enumerated() {
let keyChar = keyData[index % keyData.count]
let encryptedChar = char.unicodeScalars.first!.value ^ keyChar.unicodeScalars.first!.value
encryptedData.append(Data(from: UnicodeScalar(encryptedChar)!))
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)!
var decryptedString = ""
for (index, byte) in data.enumerated() {
let keyChar = keyData[index % keyData.count]
let decryptedChar = byte ^ keyChar
decryptedString.append(String(decoding: [decryptedChar], as: UTF8.self))
}
return decryptedString
}
}```swift
protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
// Simple XOR encryptor and decryptor that converts plain text into encrypted text by applying the binary 'Exclusive OR' operator implemented according to the protocol.
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let keyData = key.data(using: .utf8)!
var encryptedData = Data()
for (index, char) in string.enumerated() {
let keyChar = keyData[index % keyData.count]
let encryptedChar = char.unicodeScalars.first!.value ^ keyChar.unicodeScalars.first!.value
encryptedData.append(Data(from: UnicodeScalar(encryptedChar)!))
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)!
var decryptedString = ""
for (index, byte) in data.enumerated() {
let keyChar = keyData[index % keyData.count]
let decryptedChar = byte ^ keyChar
decryptedString.append(String(decoding: [decryptedChar], as: UTF8.self))
}
return decryptedString
}
}
// Example usage:
let encryptor = Encryptor()
let key = "secretkey"
let plainText = "Hello, World!"
let encryptedData = encryptor.encrypt(plainText, key)
let decryptedString = encryptor.decrypt(encryptedData, key)
print("Encrypted: \(encryptedData)")
print("Decrypted: \(decryptedString)")
```let encryptedChar = char.unicodeScalars.first!.value ^ keyChar.unicodeScalars.first!.value // value of type 'UInt8' has no member 'unicodeScalars'encryptedData.append(Data(from: UnicodeScalar(encryptedChar)!)) // argument type 'UnicodeScalar' (aka 'Unicode.Scalar') does not conform to expected type 'Decoder'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 = Data(key.utf8)
var encryptedData = Data()
for (index, char) in string.utf8.enumerated() {
let keyChar = keyData[index % keyData.count]
let encryptedChar = char ^ keyChar
encryptedData.append(encryptedChar)
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = Data(key.utf8)
var decryptedString = ""
for (index, byte) in data.enumerated() {
let keyChar = keyData[index % keyData.count]
let decryptedChar = byte ^ keyChar
decryptedString.append(Character(UnicodeScalar(decryptedChar)))
}
return decryptedString
}
}
class EncryptorTests {
func testEncryptAndDecrypt() {
let encryptor = Encryptor()
let plainText = "Hello, World!"
let key = "secret"
let encryptedData = encryptor.encrypt(plainText, key)
let decryptedString = encryptor.decrypt(encryptedData, key)
XCTAssertEqual(plainText, decryptedString)
}
}```swift
protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
// Simple XOR encryptor and decryptor that converts plain text into encrypted text by applying the binary 'Exclusive OR' operator implemented according to the protocol.
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let keyData = Data(key.utf8)
var encryptedData = Data()
for (index, char) in string.utf8.enumerated() {
let keyChar = keyData[index % keyData.count]
let encryptedChar = char ^ keyChar
encryptedData.append(encryptedChar)
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = Data(key.utf8)
var decryptedString = ""
for (index, byte) in data.enumerated() {
let keyChar = keyData[index % keyData.count]
let decryptedChar = byte ^ keyChar
decryptedString.append(Character(UnicodeScalar(decryptedChar)))
}
return decryptedString
}
}
// Unit tests for the Encryptor class.
class EncryptorTests {
func testEncryptAndDecrypt() {
let encryptor = Encryptor()
let plainText = "Hello, World!"
let key = "secret"
let encryptedData = encryptor.encrypt(plainText, key)
let decryptedString = encryptor.decrypt(encryptedData, key)
XCTAssertEqual(plainText, decryptedString)
}
}
// Run the tests.
let tests = EncryptorTests()
tests.testEncryptAndDecrypt()
```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 = Data(zip(stringData, keyData).map { $0 ^ $1 })
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)!
let decryptedData = Data(zip(data, keyData).map { $0 ^ $1 })
return String(data: decryptedData, encoding: .utf8)!
}
}
class EncryptorTests {
let encryptor = Encryptor()
func testEncryptDecrypt() {
let plainText = "Hello, World!"
let key = "secret"
let encryptedData = encryptor.encrypt(plainText, key)
let decryptedText = encryptor.decrypt(encryptedData, key)
XCTAssertEqual(plainText, decryptedText)
}
}```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 = Data(zip(stringData, keyData).map { $0 ^ $1 })
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)!
let decryptedData = Data(zip(data, keyData).map { $0 ^ $1 })
return String(data: decryptedData, encoding: .utf8)!
}
}
// Unit tests for the Encryptor class
class EncryptorTests {
let encryptor = Encryptor()
func testEncryptDecrypt() {
let plainText = "Hello, World!"
let key = "secret"
let encryptedData = encryptor.encrypt(plainText, key)
let decryptedText = encryptor.decrypt(encryptedData, key)
XCTAssertEqual(plainText, decryptedText)
}
}
// Run the tests
let tests = EncryptorTests()
tests.testEncryptDecrypt()
``` // XCTAssertEqual failed: (Hello, SwiftEval!) is not equal to (Hello, Swi)protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let keyData = key.data(using: .utf8)!
let stringData = string.data(using: .utf8)!
var encryptedData = Data(count: stringData.count)
for i in 0..<stringData.count {
let keyByte = keyData[i % keyData.count]
let stringByte = stringData[i]
encryptedData[i] = stringByte ^ keyByte
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)!
var decryptedData = Data(count: data.count)
for i in 0..<data.count {
let keyByte = keyData[i % keyData.count]
let dataByte = data[i]
decryptedData[i] = dataByte ^ keyByte
}
return String(data: decryptedData, encoding: .utf8)!
}
}```swift
protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
// Simple XOR encryptor and decryptor that converts plain text into encrypted text by applying the binary 'Exclusive OR' operator implemented according to the protocol.
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let keyData = key.data(using: .utf8)!
let stringData = string.data(using: .utf8)!
var encryptedData = Data(count: stringData.count)
for i in 0..<stringData.count {
let keyByte = keyData[i % keyData.count]
let stringByte = stringData[i]
encryptedData[i] = stringByte ^ keyByte
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = key.data(using: .utf8)!
var decryptedData = Data(count: data.count)
for i in 0..<data.count {
let keyByte = keyData[i % keyData.count]
let dataByte = data[i]
decryptedData[i] = dataByte ^ keyByte
}
return String(data: decryptedData, encoding: .utf8)!
}
}
// Example usage:
let encryptor = Encryptor()
let plainText = "Hello, World!"
let key = "secret"
let encryptedData = encryptor.encrypt(plainText, key)
print("Encrypted:", encryptedData.base64EncodedString())
let decryptedText = encryptor.decrypt(encryptedData, key)
print("Decrypted:", decryptedText)
```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 = Data(key.utf8)
var encryptedData = Data()
for (index, char) in string.utf8.enumerated() {
let keyChar = keyData[index % keyData.count]
let encryptedChar = char ^ keyChar
encryptedData.append(encryptedChar)
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = Data(key.utf8)
var decryptedString = ""
for (index, byte) in data.enumerated() {
let keyChar = keyData[index % keyData.count]
let decryptedChar = byte ^ keyChar
decryptedString.append(Character(UnicodeScalar(decryptedChar)))
}
return decryptedString
}
}```swift
protocol EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data
func decrypt(_ data: Data, _ key: String) -> String
}
// Simple XOR encryptor and decryptor that converts plain text into encrypted text by applying the binary 'Exclusive OR' operator implemented according to the protocol.
class Encryptor: EncryptorProtocol {
func encrypt(_ string: String, _ key: String) -> Data {
let keyData = Data(key.utf8)
var encryptedData = Data()
for (index, char) in string.utf8.enumerated() {
let keyChar = keyData[index % keyData.count]
let encryptedChar = char ^ keyChar
encryptedData.append(encryptedChar)
}
return encryptedData
}
func decrypt(_ data: Data, _ key: String) -> String {
let keyData = Data(key.utf8)
var decryptedString = ""
for (index, byte) in data.enumerated() {
let keyChar = keyData[index % keyData.count]
let decryptedChar = byte ^ keyChar
decryptedString.append(Character(UnicodeScalar(decryptedChar)))
}
return decryptedString
}
}
// Example usage:
let encryptor = Encryptor()
let originalText = "Hello, World!"
let encryptionKey = "secret"
let encryptedData = encryptor.encrypt(originalText, encryptionKey)
print("Encrypted: \(encryptedData)")
let decryptedText = encryptor.decrypt(encryptedData, encryptionKey)
print("Decrypted: \(decryptedText)")
```protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var lastRequestTime: Date?
private var requestCount: Int = 0
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 timeSinceLastRequest = Date().timeIntervalSince(lastRequestTime)
if timeSinceLastRequest >= timeInterval {
self.lastRequestTime = Date()
requestCount = 1
return true
} else if requestCount < maxRequests {
requestCount += 1
return true
} else {
return false
}
}
}```swift
protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var lastRequestTime: Date?
private var requestCount: Int = 0
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 timeSinceLastRequest = Date().timeIntervalSince(lastRequestTime)
if timeSinceLastRequest >= timeInterval {
self.lastRequestTime = Date()
requestCount = 1
return true
} else if requestCount < maxRequests {
requestCount += 1
return true
} else {
return false
}
}
}
```Thread.sleep(forTimeInterval: 1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var lastRequestTime: Date?
private var requestCount: Int = 0
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let currentTime = Date()
if let lastRequestTime = lastRequestTime, currentTime.timeIntervalSince(lastRequestTime) < timeInterval {
requestCount += 1
if requestCount > maxRequests {
return false
}
} else {
requestCount = 1
lastRequestTime = currentTime
}
return true
}
}
class RateLimiterTests {
func testRateLimiter() {
let rateLimiter = RateLimiter(maxRequests: 2, timeInterval: 1.0)
XCTAssertTrue(rateLimiter.allowRequest(), "First request should be allowed")
XCTAssertTrue(rateLimiter.allowRequest(), "Second request should be allowed")
XCTAssertFalse(rateLimiter.allowRequest(), "Third request should not be allowed within the time interval")
sleep(2) // Wait for 2 seconds to reset the request count
XCTAssertTrue(rateLimiter.allowRequest(), "Fourth request should be allowed after the time interval")
}
}```swift
protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var lastRequestTime: Date?
private var requestCount: Int = 0
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let currentTime = Date()
if let lastRequestTime = lastRequestTime, currentTime.timeIntervalSince(lastRequestTime) < timeInterval {
requestCount += 1
if requestCount > maxRequests {
return false
}
} else {
requestCount = 1
lastRequestTime = currentTime
}
return true
}
}
// Unit tests for the RateLimiter class.
class RateLimiterTests {
func testRateLimiter() {
let rateLimiter = RateLimiter(maxRequests: 2, timeInterval: 1.0)
XCTAssertTrue(rateLimiter.allowRequest(), "First request should be allowed")
XCTAssertTrue(rateLimiter.allowRequest(), "Second request should be allowed")
XCTAssertFalse(rateLimiter.allowRequest(), "Third request should not be allowed within the time interval")
sleep(2) // Wait for 2 seconds to reset the request count
XCTAssertTrue(rateLimiter.allowRequest(), "Fourth request should be allowed after the time interval")
}
}
// Run the unit tests
let tests = RateLimiterTests()
tests.testRateLimiter()
```Thread.sleep(forTimeInterval: 1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var lastRequestTime: Date?
private var requestCount: Int = 0
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let currentTime = Date()
if let lastRequestTime = lastRequestTime, currentTime.timeIntervalSince(lastRequestTime) < timeInterval {
requestCount += 1
if requestCount > maxRequests {
return false
}
} else {
requestCount = 1
lastRequestTime = currentTime
}
return true
}
}```swift
protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var lastRequestTime: Date?
private var requestCount: Int = 0
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let currentTime = Date()
if let lastRequestTime = lastRequestTime, currentTime.timeIntervalSince(lastRequestTime) < timeInterval {
requestCount += 1
if requestCount > maxRequests {
return false
}
} else {
requestCount = 1
lastRequestTime = currentTime
}
return true
}
}
// Example usage:
let rateLimiter = RateLimiter(maxRequests: 5, timeInterval: 60) // 5 requests per minute
for _ in 1...10 {
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 var maxRequests: Int
private var timeInterval: TimeInterval
private var lastRequestTime: Date?
private var requestCount: Int = 0
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let currentTime = Date()
if let lastRequestTime = lastRequestTime, currentTime.timeIntervalSince(lastRequestTime) < timeInterval {
requestCount += 1
if requestCount > maxRequests {
return false
}
} else {
requestCount = 1
lastRequestTime = currentTime
}
return true
}
}```swift
protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var lastRequestTime: Date?
private var requestCount: Int = 0
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let currentTime = Date()
if let lastRequestTime = lastRequestTime, currentTime.timeIntervalSince(lastRequestTime) < timeInterval {
requestCount += 1
if requestCount > maxRequests {
return false
}
} else {
requestCount = 1
lastRequestTime = currentTime
}
return true
}
}
// Example usage:
let rateLimiter = RateLimiter(maxRequests: 5, timeInterval: 60) // 5 requests per minute
for _ in 0..<10 {
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 var maxRequests: Int
private var timeInterval: TimeInterval
private var lastRequestTime: Date?
private var requestCount: Int = 0
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let currentTime = Date()
if let lastRequestTime = lastRequestTime, currentTime.timeIntervalSince(lastRequestTime) < timeInterval {
requestCount += 1
if requestCount > maxRequests {
return false
}
} else {
requestCount = 1
lastRequestTime = currentTime
}
return true
}
}
class RateLimiterTests {
func testRateLimiter() {
let rateLimiter = RateLimiter(maxRequests: 2, timeInterval: 1.0)
XCTAssertTrue(rateLimiter.allowRequest())
XCTAssertTrue(rateLimiter.allowRequest())
XCTAssertFalse(rateLimiter.allowRequest())
sleep(2)
XCTAssertTrue(rateLimiter.allowRequest())
}
}```swift
protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var lastRequestTime: Date?
private var requestCount: Int = 0
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let currentTime = Date()
if let lastRequestTime = lastRequestTime, currentTime.timeIntervalSince(lastRequestTime) < timeInterval {
requestCount += 1
if requestCount > maxRequests {
return false
}
} else {
requestCount = 1
lastRequestTime = currentTime
}
return true
}
}
// Unit tests for the RateLimiter class.
class RateLimiterTests {
func testRateLimiter() {
let rateLimiter = RateLimiter(maxRequests: 2, timeInterval: 1.0)
XCTAssertTrue(rateLimiter.allowRequest())
XCTAssertTrue(rateLimiter.allowRequest())
XCTAssertFalse(rateLimiter.allowRequest())
sleep(2)
XCTAssertTrue(rateLimiter.allowRequest())
}
}
// Run the unit tests.
let tests = RateLimiterTests()
tests.testRateLimiter()
```Thread.sleep(forTimeInterval: 1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var lastRequestTime: Date?
private var requestCount: Int = 0
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let currentTime = Date()
if let lastRequestTime = lastRequestTime, currentTime.timeIntervalSince(lastRequestTime) < timeInterval {
requestCount += 1
if requestCount > maxRequests {
return false
}
} else {
requestCount = 1
lastRequestTime = currentTime
}
return true
}
}```swift
protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var lastRequestTime: Date?
private var requestCount: Int = 0
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let currentTime = Date()
if let lastRequestTime = lastRequestTime, currentTime.timeIntervalSince(lastRequestTime) < timeInterval {
requestCount += 1
if requestCount > maxRequests {
return false
}
} else {
requestCount = 1
lastRequestTime = currentTime
}
return true
}
}
// Example usage:
let rateLimiter = RateLimiter(maxRequests: 5, timeInterval: 60) // Allow 5 requests per minute
for _ in 1...10 {
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 var maxRequests: Int
private var timeInterval: TimeInterval
private var lastRequestTime: Date?
private var requestCount: Int = 0
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 timeSinceLastRequest = Date().timeIntervalSince(lastRequestTime)
if timeSinceLastRequest >= 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 var maxRequests: Int
private var timeInterval: TimeInterval
private var lastRequestTime: Date?
private var requestCount: Int = 0
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 timeSinceLastRequest = Date().timeIntervalSince(lastRequestTime)
if timeSinceLastRequest >= 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 var maxRequests: Int
private var timeInterval: TimeInterval
private var lastRequestTime: Date?
private var requestCount: Int = 0
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 timeSinceLastRequest = Date().timeIntervalSince(lastRequestTime)
if timeSinceLastRequest >= 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 var maxRequests: Int
private var timeInterval: TimeInterval
private var lastRequestTime: Date?
private var requestCount: Int = 0
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 timeSinceLastRequest = Date().timeIntervalSince(lastRequestTime)
if timeSinceLastRequest >= timeInterval {
self.lastRequestTime = Date()
requestCount = 1
return true
}
if requestCount < maxRequests {
requestCount += 1
return true
}
return false
}
}
// Example usage:
let rateLimiter = RateLimiter(maxRequests: 5, timeInterval: 60) // Allow 5 requests per minute
for _ in 1...10 {
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 var maxRequests: Int
private var timeInterval: TimeInterval
private var lastRequestTime: Date?
private var requestCount: Int = 0
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let currentTime = Date()
if let lastRequestTime = lastRequestTime, currentTime.timeIntervalSince(lastRequestTime) < timeInterval {
requestCount += 1
if requestCount > maxRequests {
return false
}
} else {
requestCount = 1
lastRequestTime = currentTime
}
return true
}
}
class RateLimiterTests: XCTestCase {
var rateLimiter: RateLimiter!
override func setUp() {
super.setUp()
rateLimiter = RateLimiter(maxRequests: 2, timeInterval: 1.0)
}
func testAllowRequest() {
XCTAssertTrue(rateLimiter.allowRequest())
XCTAssertTrue(rateLimiter.allowRequest())
XCTAssertFalse(rateLimiter.allowRequest())
sleep(2)
XCTAssertTrue(rateLimiter.allowRequest())
}
}```swift
protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var lastRequestTime: Date?
private var requestCount: Int = 0
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let currentTime = Date()
if let lastRequestTime = lastRequestTime, currentTime.timeIntervalSince(lastRequestTime) < timeInterval {
requestCount += 1
if requestCount > maxRequests {
return false
}
} else {
requestCount = 1
lastRequestTime = currentTime
}
return true
}
}
// Unit tests for the RateLimiter class.
class RateLimiterTests: XCTestCase {
var rateLimiter: RateLimiter!
override func setUp() {
super.setUp()
rateLimiter = RateLimiter(maxRequests: 2, timeInterval: 1.0)
}
func testAllowRequest() {
XCTAssertTrue(rateLimiter.allowRequest())
XCTAssertTrue(rateLimiter.allowRequest())
XCTAssertFalse(rateLimiter.allowRequest())
sleep(2)
XCTAssertTrue(rateLimiter.allowRequest())
}
}
// Run the tests.
var tests = [RateLimiterTests]
XCTMain(tests)
```override func setUp() { // method does not override any method from its superclasssuper.setUp() // value of type 'XCTestCase' has no member 'setUp'Thread.sleep(forTimeInterval: 1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var lastRequestTime: Date?
private var requestCount: Int = 0
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let currentTime = Date()
if let lastRequestTime = lastRequestTime, currentTime.timeIntervalSince(lastRequestTime) < timeInterval {
requestCount += 1
if requestCount > maxRequests {
return false
}
} else {
requestCount = 1
lastRequestTime = currentTime
}
return true
}
}
class RateLimiterTests: XCTestCase {
func testRateLimiter() {
let rateLimiter = RateLimiter(maxRequests: 2, timeInterval: 1.0)
XCTAssertTrue(rateLimiter.allowRequest())
XCTAssertTrue(rateLimiter.allowRequest())
XCTAssertFalse(rateLimiter.allowRequest())
sleep(2)
XCTAssertTrue(rateLimiter.allowRequest())
}
}```swift
protocol RateLimiterProtocol {
init(maxRequests: Int, timeInterval: TimeInterval)
func allowRequest() -> Bool
}
// Rate limiter that controls the rate of actions.
// Consists with a maximum number of requests and a time interval, and includes a method to determine if a new request can be made within the defined limits.
class RateLimiter: RateLimiterProtocol {
private var maxRequests: Int
private var timeInterval: TimeInterval
private var lastRequestTime: Date?
private var requestCount: Int = 0
required init(maxRequests: Int, timeInterval: TimeInterval) {
self.maxRequests = maxRequests
self.timeInterval = timeInterval
}
func allowRequest() -> Bool {
let currentTime = Date()
if let lastRequestTime = lastRequestTime, currentTime.timeIntervalSince(lastRequestTime) < timeInterval {
requestCount += 1
if requestCount > maxRequests {
return false
}
} else {
requestCount = 1
lastRequestTime = currentTime
}
return true
}
}
// Unit tests for the RateLimiter class.
class RateLimiterTests: XCTestCase {
func testRateLimiter() {
let rateLimiter = RateLimiter(maxRequests: 2, timeInterval: 1.0)
XCTAssertTrue(rateLimiter.allowRequest())
XCTAssertTrue(rateLimiter.allowRequest())
XCTAssertFalse(rateLimiter.allowRequest())
sleep(2)
XCTAssertTrue(rateLimiter.allowRequest())
}
}
// Run the tests.
RateLimiterTests.defaultTestSuite.run()
```Thread.sleep(forTimeInterval: 1) // class method 'sleep' is unavailable from asynchronous contexts; Use Task.sleep(until:clock:) instead.; this is an error in Swift 6protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let queue = DispatchQueue(label: "ThreadSafeCounterQueue", attributes: .concurrent)
required init(value: Int) {
self.value = value
}
func increment() {
queue.async(flags: .barrier) {
self.value += 1
}
}
func currentValue() -> Int {
var result: Int
queue.sync {
result = self.value
}
return result
}
}
class ThreadSafeCounterTests {
func testThreadSafeCounter() {
let counter = ThreadSafeCounter(value: 0)
let incrementCount = 1000
// Increment the counter in a concurrent queue.
let queue = DispatchQueue(label: "IncrementQueue", attributes: .concurrent)
for _ in 0..<incrementCount {
queue.async {
counter.increment()
}
}
// Wait for all operations to complete.
queue.sync {}
// Assert that the final value is equal to the number of increments.
XCTAssertEqual(counter.currentValue(), incrementCount, "Counter value should be equal to the number of increments.")
}
}```swift
protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let queue = DispatchQueue(label: "ThreadSafeCounterQueue", attributes: .concurrent)
required init(value: Int) {
self.value = value
}
func increment() {
queue.async(flags: .barrier) {
self.value += 1
}
}
func currentValue() -> Int {
var result: Int
queue.sync {
result = self.value
}
return result
}
}
// Unit tests for the ThreadSafeCounter class.
class ThreadSafeCounterTests {
func testThreadSafeCounter() {
let counter = ThreadSafeCounter(value: 0)
let incrementCount = 1000
// Increment the counter in a concurrent queue.
let queue = DispatchQueue(label: "IncrementQueue", attributes: .concurrent)
for _ in 0..<incrementCount {
queue.async {
counter.increment()
}
}
// Wait for all operations to complete.
queue.sync {}
// Assert that the final value is equal to the number of increments.
XCTAssertEqual(counter.currentValue(), incrementCount, "Counter value should be equal to the number of increments.")
}
}
// Run the tests.
let tests = ThreadSafeCounterTests()
tests.testThreadSafeCounter()
```queue.sync { // variable 'result' captured by a closure before being initializedreturn result // variable 'result' used before being initializedprotocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let queue = DispatchQueue(label: "ThreadSafeCounterQueue", attributes: .concurrent)
required init(value: Int) {
self.value = value
}
func increment() {
queue.async(flags: .barrier) {
self.value += 1
}
}
func currentValue() -> Int {
var result: Int
queue.sync {
result = self.value
}
return result
}
}
class ThreadSafeCounterTests {
func testThreadSafeCounter() {
let counter = ThreadSafeCounter(value: 0)
// Increment the counter in a concurrent queue.
let concurrentQueue = DispatchQueue(label: "ConcurrentQueue", attributes: .concurrent)
for _ in 1...1000 {
concurrentQueue.async {
counter.increment()
}
}
// Wait for all operations to complete.
concurrentQueue.sync(flags: .barrier) {}
// Check if the counter value is correct.
XCTAssertEqual(counter.currentValue(), 1000, "Counter value should be 1000")
}
}```swift
protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let queue = DispatchQueue(label: "ThreadSafeCounterQueue", attributes: .concurrent)
required init(value: Int) {
self.value = value
}
func increment() {
queue.async(flags: .barrier) {
self.value += 1
}
}
func currentValue() -> Int {
var result: Int
queue.sync {
result = self.value
}
return result
}
}
// Unit tests for the ThreadSafeCounter class.
class ThreadSafeCounterTests {
func testThreadSafeCounter() {
let counter = ThreadSafeCounter(value: 0)
// Increment the counter in a concurrent queue.
let concurrentQueue = DispatchQueue(label: "ConcurrentQueue", attributes: .concurrent)
for _ in 1...1000 {
concurrentQueue.async {
counter.increment()
}
}
// Wait for all operations to complete.
concurrentQueue.sync(flags: .barrier) {}
// Check if the counter value is correct.
XCTAssertEqual(counter.currentValue(), 1000, "Counter value should be 1000")
}
}
// Run the tests.
let tests = ThreadSafeCounterTests()
tests.testThreadSafeCounter()
```queue.sync { // variable 'result' captured by a closure before being initializedreturn result // variable 'result' used before being initializedprotocol 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
}
}
class ThreadSafeCounterTests {
func testThreadSafeCounter() {
let counter = ThreadSafeCounter(value: 0)
let incrementCount = 1000
let incrementQueue = DispatchQueue(label: "incrementQueue")
for _ in 0..<incrementCount {
incrementQueue.async {
counter.increment()
}
}
DispatchQueue.global().sync {
XCTAssertEqual(counter.currentValue(), incrementCount, "Counter value should be equal to increment count")
}
}
}```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
}
}
// Unit tests for ThreadSafeCounter
class ThreadSafeCounterTests {
func testThreadSafeCounter() {
let counter = ThreadSafeCounter(value: 0)
let incrementCount = 1000
let incrementQueue = DispatchQueue(label: "incrementQueue")
for _ in 0..<incrementCount {
incrementQueue.async {
counter.increment()
}
}
DispatchQueue.global().sync {
XCTAssertEqual(counter.currentValue(), incrementCount, "Counter value should be equal to increment count")
}
}
}
// Run the tests
let tests = ThreadSafeCounterTests()
tests.testThreadSafeCounter()
```protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let queue = DispatchQueue(label: "ThreadSafeCounterQueue", attributes: .concurrent)
required init(value: Int) {
self.value = value
}
func increment() {
queue.async(flags: .barrier) {
self.value += 1
}
}
func currentValue() -> Int {
var result: Int!
queue.sync {
result = self.value
}
return result
}
}
class ThreadSafeCounterTests {
func testThreadSafeCounter() {
let counter = ThreadSafeCounter(value: 0)
let incrementThread = Thread {
for _ in 0..<1000 {
counter.increment()
}
}
let readThread = Thread {
for _ in 0..<1000 {
let value = counter.currentValue()
assert(value >= 0 && value <= 1000, "Value should be between 0 and 1000")
}
}
incrementThread.start()
readThread.start()
incrementThread.join()
readThread.join()
let finalValue = counter.currentValue()
assert(finalValue == 1000, "Final value should be 1000")
}
}```swift
protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let queue = DispatchQueue(label: "ThreadSafeCounterQueue", attributes: .concurrent)
required init(value: Int) {
self.value = value
}
func increment() {
queue.async(flags: .barrier) {
self.value += 1
}
}
func currentValue() -> Int {
var result: Int!
queue.sync {
result = self.value
}
return result
}
}
// Unit tests for ThreadSafeCounter
class ThreadSafeCounterTests {
func testThreadSafeCounter() {
let counter = ThreadSafeCounter(value: 0)
let incrementThread = Thread {
for _ in 0..<1000 {
counter.increment()
}
}
let readThread = Thread {
for _ in 0..<1000 {
let value = counter.currentValue()
assert(value >= 0 && value <= 1000, "Value should be between 0 and 1000")
}
}
incrementThread.start()
readThread.start()
incrementThread.join()
readThread.join()
let finalValue = counter.currentValue()
assert(finalValue == 1000, "Final value should be 1000")
}
}
// Run the tests
let tests = ThreadSafeCounterTests()
tests.testThreadSafeCounter()
```incrementThread.join() // value of type 'Thread' has no member 'join'readThread.join() // value of type 'Thread' has no member 'join'protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let queue = DispatchQueue(label: "ThreadSafeCounterQueue")
required init(value: Int) {
self.value = value
}
func increment() {
queue.sync {
self.value += 1
}
}
func currentValue() -> Int {
return queue.sync {
return self.value
}
}
}
class ThreadSafeCounterTests {
func testThreadSafeCounter() {
let counter = ThreadSafeCounter(value: 0)
// Increment the counter 1000 times concurrently
let group = DispatchGroup()
for _ in 1...1000 {
group.enter()
DispatchQueue.global().async {
counter.increment()
group.leave()
}
}
group.wait()
// Check if the counter value is correct
XCTAssertEqual(counter.currentValue(), 1000, "Counter value should be 1000")
}
}```swift
protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let queue = DispatchQueue(label: "ThreadSafeCounterQueue")
required init(value: Int) {
self.value = value
}
func increment() {
queue.sync {
self.value += 1
}
}
func currentValue() -> Int {
return queue.sync {
return self.value
}
}
}
// Unit tests for ThreadSafeCounter class
class ThreadSafeCounterTests {
func testThreadSafeCounter() {
let counter = ThreadSafeCounter(value: 0)
// Increment the counter 1000 times concurrently
let group = DispatchGroup()
for _ in 1...1000 {
group.enter()
DispatchQueue.global().async {
counter.increment()
group.leave()
}
}
group.wait()
// Check if the counter value is correct
XCTAssertEqual(counter.currentValue(), 1000, "Counter value should be 1000")
}
}
// Run the tests
let tests = ThreadSafeCounterTests()
tests.testThreadSafeCounter()
```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
}
}
class ThreadSafeCounterTests {
func testThreadSafeCounter() {
let counter = ThreadSafeCounter(value: 0)
// Simulate concurrent access and updates to the counter
let queue = DispatchQueue(label: "com.example.concurrentqueue", attributes: .concurrent)
for _ in 1...1000 {
queue.async {
counter.increment()
}
}
queue.sync(flags: .barrier) {
XCTAssertEqual(counter.currentValue(), 1000)
}
}
}```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
}
}
// Unit tests for ThreadSafeCounter
class ThreadSafeCounterTests {
func testThreadSafeCounter() {
let counter = ThreadSafeCounter(value: 0)
// Simulate concurrent access and updates to the counter
let queue = DispatchQueue(label: "com.example.concurrentqueue", attributes: .concurrent)
for _ in 1...1000 {
queue.async {
counter.increment()
}
}
queue.sync(flags: .barrier) {
XCTAssertEqual(counter.currentValue(), 1000)
}
}
}
// Run the tests
let tests = ThreadSafeCounterTests()
tests.testThreadSafeCounter()
```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
}
}
// Example usage:
let counter = ThreadSafeCounter(value: 0)
counter.increment()
print(counter.currentValue()) // Output: 1
```protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let queue = DispatchQueue(label: "ThreadSafeCounterQueue", attributes: .concurrent)
required init(value: Int) {
self.value = value
}
func increment() {
queue.async(flags: .barrier) {
self.value += 1
}
}
func currentValue() -> Int {
var result: Int
queue.sync {
result = self.value
}
return result
}
}
class ThreadSafeCounterTests {
func testThreadSafeCounter() {
let counter = ThreadSafeCounter(value: 0)
// Increment the counter in a concurrent queue
let concurrentQueue = DispatchQueue(label: "ConcurrentQueue", attributes: .concurrent)
for _ in 0..<1000 {
concurrentQueue.async {
counter.increment()
}
}
// Wait for all operations to complete
concurrentQueue.sync(flags: .barrier) {}
// Check the final value
XCTAssertEqual(counter.currentValue(), 1000, "Counter value should be 1000")
}
}```swift
protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let queue = DispatchQueue(label: "ThreadSafeCounterQueue", attributes: .concurrent)
required init(value: Int) {
self.value = value
}
func increment() {
queue.async(flags: .barrier) {
self.value += 1
}
}
func currentValue() -> Int {
var result: Int
queue.sync {
result = self.value
}
return result
}
}
// Unit tests for ThreadSafeCounter
class ThreadSafeCounterTests {
func testThreadSafeCounter() {
let counter = ThreadSafeCounter(value: 0)
// Increment the counter in a concurrent queue
let concurrentQueue = DispatchQueue(label: "ConcurrentQueue", attributes: .concurrent)
for _ in 0..<1000 {
concurrentQueue.async {
counter.increment()
}
}
// Wait for all operations to complete
concurrentQueue.sync(flags: .barrier) {}
// Check the final value
XCTAssertEqual(counter.currentValue(), 1000, "Counter value should be 1000")
}
}
// Run the tests
let tests = ThreadSafeCounterTests()
tests.testThreadSafeCounter()
```queue.sync { // variable 'result' captured by a closure before being initializedreturn result // variable 'result' used before being initializedprotocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let queue = DispatchQueue(label: "ThreadSafeCounterQueue", attributes: .concurrent)
required init(value: Int) {
self.value = value
}
func increment() {
queue.async(flags: .barrier) {
self.value += 1
}
}
func currentValue() -> Int {
var result: Int
queue.sync {
result = self.value
}
return result
}
}
class ThreadSafeCounterTests {
func testThreadSafeCounter() {
let counter = ThreadSafeCounter(value: 0)
// Increment the counter in a concurrent queue
let queue = DispatchQueue(label: "TestQueue", attributes: .concurrent)
for _ in 1...1000 {
queue.async {
counter.increment()
}
}
// Wait for all operations to complete
queue.sync {}
// Check if the final value is 1000
XCTAssertEqual(counter.currentValue(), 1000, "Counter value should be 1000")
}
}```swift
protocol ThreadSafeCounterProtocol {
init(value: Int)
func increment()
func currentValue() -> Int
}
// Basic number counter with possibility to increment counter and access current value.
// Thread-safe for read and write operations.
class ThreadSafeCounter: ThreadSafeCounterProtocol {
private var value: Int
private let queue = DispatchQueue(label: "ThreadSafeCounterQueue", attributes: .concurrent)
required init(value: Int) {
self.value = value
}
func increment() {
queue.async(flags: .barrier) {
self.value += 1
}
}
func currentValue() -> Int {
var result: Int
queue.sync {
result = self.value
}
return result
}
}
// Unit tests for ThreadSafeCounter
class ThreadSafeCounterTests {
func testThreadSafeCounter() {
let counter = ThreadSafeCounter(value: 0)
// Increment the counter in a concurrent queue
let queue = DispatchQueue(label: "TestQueue", attributes: .concurrent)
for _ in 1...1000 {
queue.async {
counter.increment()
}
}
// Wait for all operations to complete
queue.sync {}
// Check if the final value is 1000
XCTAssertEqual(counter.currentValue(), 1000, "Counter value should be 1000")
}
}
// Run the tests
let tests = ThreadSafeCounterTests()
tests.testThreadSafeCounter()
```queue.sync { // variable 'result' captured by a closure before being initializedreturn result // variable 'result' used before being initializedprotocol 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
}
}
class ThreadSafeCounterTests {
func testThreadSafeCounter() {
let counter = ThreadSafeCounter(value: 0)
counter.increment()
XCTAssertEqual(counter.currentValue(), 1)
}
}```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
}
}
// Unit tests for ThreadSafeCounter
class ThreadSafeCounterTests {
func testThreadSafeCounter() {
let counter = ThreadSafeCounter(value: 0)
counter.increment()
XCTAssertEqual(counter.currentValue(), 1)
}
}
// Example usage:
let counter = ThreadSafeCounter(value: 0)
counter.increment()
print(counter.currentValue()) // Output: 1
```protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<T>: PipelineProtocol {
var value: T
required init(value: T) {
self.value = value
}
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
return Pipeline(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 {
var value: T
required init(value: T) {
self.value = value
}
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
return Pipeline(value: transform(value))
}
func execute() -> T {
return value
}
}
// Example usage:
let initialValue = 5
let pipeline = Pipeline(value: initialValue)
.pipe { $0 * 2 }
.pipe { $0 + 3 }
.pipe { $0 / 2 }
.pipe { $0 - 1 }
let result = pipeline.execute()
print(result) // Output: 8
```return Pipeline(value: transform(value)) // cannot convert return expression of type 'Pipeline<T>' to return type 'Pipeline<U>'return Pipeline(value: transform(value)) // cannot convert value of type 'U' to expected argument type 'T'protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<T>: PipelineProtocol {
var value: T
required init(value: T) {
self.value = value
}
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
return Pipeline(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 {
var value: T
required init(value: T) {
self.value = value
}
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
return Pipeline(value: transform(value))
}
func execute() -> T {
return value
}
}
// Example usage:
let result = Pipeline(value: 5)
.pipe { $0 + 2 }
.pipe { $0 * 3 }
.pipe { String($0) }
.execute()
print(result) // Output: "19"
```return Pipeline(value: transform(value)) // cannot convert return expression of type 'Pipeline<T>' to return type 'Pipeline<U>'return Pipeline(value: transform(value)) // cannot convert value of type 'U' to expected argument type '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(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(value: transform(value))
}
func execute() -> T {
return value
}
}
// Example usage:
let result = Pipeline(value: 5)
.pipe { $0 + 2 }
.pipe { $0 * 3 }
.execute()
print(result) // Output: 21
```return Pipeline(value: transform(value)) // cannot convert return expression of type 'Pipeline<T>' to return type 'Pipeline<U>'return Pipeline(value: transform(value)) // cannot convert value of type 'U' to expected argument type 'T'protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<T>: PipelineProtocol {
var value: T
required init(value: T) {
self.value = value
}
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
return Pipeline(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 {
var value: T
required init(value: T) {
self.value = value
}
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
return Pipeline(value: transform(value))
}
func execute() -> T {
return value
}
}
// Example usage:
let initialValue = 5
let result = Pipeline(value: initialValue)
.pipe { $0 + 2 } // Add 2 to the initial value
.pipe { $0 * 3 } // Multiply the result by 3
.execute() // Execute the pipeline and get the final result
print(result) // Output: 21
```return Pipeline(value: transform(value)) // cannot convert return expression of type 'Pipeline<T>' to return type 'Pipeline<U>'return Pipeline(value: transform(value)) // cannot convert value of type 'U' to expected argument type 'T'protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<T>: PipelineProtocol {
var value: T
required init(value: T) {
self.value = value
}
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
return Pipeline(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 {
var value: T
required init(value: T) {
self.value = value
}
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
return Pipeline(value: transform(value))
}
func execute() -> T {
return value
}
}
// Example usage:
let result = Pipeline(value: 5)
.pipe { $0 + 2 }
.pipe { $0 * 3 }
.execute()
print(result) // Output: 21
```return Pipeline(value: transform(value)) // cannot convert return expression of type 'Pipeline<T>' to return type 'Pipeline<U>'return Pipeline(value: transform(value)) // cannot convert value of type 'U' to expected argument type 'T'protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<T>: PipelineProtocol {
var value: T
required init(value: T) {
self.value = value
}
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
return Pipeline(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 {
var value: T
required init(value: T) {
self.value = value
}
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
return Pipeline(value: transform(value))
}
func execute() -> T {
return value
}
}
// Example usage:
let result = Pipeline(value: 5)
.pipe { $0 + 2 }
.pipe { $0 * 3 }
.execute()
print(result) // Output: 21
```return Pipeline(value: transform(value)) // cannot convert return expression of type 'Pipeline<T>' to return type 'Pipeline<U>'return Pipeline(value: transform(value)) // cannot convert value of type 'U' to expected argument type '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> {
let nextValue = transform(value)
return Pipeline(value: nextValue)
}
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> {
let nextValue = transform(value)
return Pipeline(value: nextValue)
}
func execute() -> T {
return value
}
}
// Example usage:
let initialValue = 5
let pipeline = Pipeline(value: initialValue)
.pipe { $0 + 2 } // Add 2 to the initial value
.pipe { $0 * 3 } // Multiply the result by 3
.pipe { $0 - 1 } // Subtract 1 from the result
let finalValue = pipeline.execute()
print("Final value: \(finalValue)") // Output: Final value: 16
```return Pipeline(value: nextValue) // cannot convert value of type 'U' to expected argument type 'T'return Pipeline(value: nextValue) // cannot convert return expression of type 'Pipeline<T>' to return type 'Pipeline<U>'protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<T>: PipelineProtocol {
var value: T
required init(value: T) {
self.value = value
}
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
return Pipeline(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 {
var value: T
required init(value: T) {
self.value = value
}
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
return Pipeline(value: transform(value))
}
func execute() -> T {
return value
}
}
// Example usage:
let initialValue = 5
let pipeline = Pipeline(value: initialValue)
.pipe { $0 * 2 }
.pipe { $0 + 3 }
.pipe { $0.description }
.pipe { Int($0)! }
.pipe { $0 / 2 }
let finalValue = pipeline.execute()
print(finalValue) // Output: 11
```return Pipeline(value: transform(value)) // cannot convert return expression of type 'Pipeline<T>' to return type 'Pipeline<U>'return Pipeline(value: transform(value)) // cannot convert value of type 'U' to expected argument type 'T'protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<T>: PipelineProtocol {
var value: T
required init(value: T) {
self.value = value
}
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
return Pipeline(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 {
var value: T
required init(value: T) {
self.value = value
}
func pipe<U>(_ transform: @escaping (T) -> U) -> Pipeline<U> {
return Pipeline(value: transform(value))
}
func execute() -> T {
return value
}
}
// Example usage:
let pipeline = Pipeline(value: 5)
.pipe { $0 * 2 }
.pipe { $0 + 3 }
.pipe { $0.description }
.pipe { Int($0) ?? 0 }
.pipe { $0 * 10 }
.execute()
print(pipeline) // Output: 60
```return Pipeline(value: transform(value)) // cannot convert return expression of type 'Pipeline<T>' to return type 'Pipeline<U>'return Pipeline(value: transform(value)) // cannot convert value of type 'U' to expected argument type 'T'protocol PipelineProtocol {
associatedtype Output
init(value: Output)
func pipe<U>(_ transform: @escaping (Output) -> U) -> Pipeline<U>
func execute() -> Output
}
class Pipeline<Input>: PipelineProtocol {
private var value: Input
required init(value: Input) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Input) -> U) -> Pipeline<U> {
let nextValue = transform(value)
return Pipeline(value: nextValue)
}
func execute() -> Input {
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<Input>: PipelineProtocol {
private var value: Input
required init(value: Input) {
self.value = value
}
func pipe<U>(_ transform: @escaping (Input) -> U) -> Pipeline<U> {
let nextValue = transform(value)
return Pipeline(value: nextValue)
}
func execute() -> Input {
return value
}
}
// Example usage:
let initialValue = 5
let pipeline = Pipeline(value: initialValue)
.pipe { $0 + 1 }
.pipe { $0 * 2 }
.pipe { $0 - 3 }
let result = pipeline.execute()
print(result) // Output: 9
```return Pipeline(value: nextValue) // cannot convert value of type 'U' to expected argument type 'Input'return Pipeline(value: nextValue) // cannot convert return expression of type 'Pipeline<Input>' to return type 'Pipeline<U>'protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
class ObservableProperty<Value>: ObservablePropertyProtocol {
private var observers = [UUID: (Value) -> Void]()
private var value: Value
init(value: Value) {
self.value = value
}
var wrappedValue: Value {
get { return value }
set {
value = newValue
notifyObservers()
}
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers[id] = observer
return id
}
func unsubscribe(_ observer: UUID) {
observers.removeValue(forKey: observer)
}
private func notifyObservers() {
for observer in observers.values {
observer(value)
}
}
}```swift
protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
// Generic observable property that notifies observers of value changes.
class ObservableProperty<Value>: ObservablePropertyProtocol {
private var observers = [UUID: (Value) -> Void]()
private var value: Value
init(value: Value) {
self.value = value
}
var wrappedValue: Value {
get { return value }
set {
value = newValue
notifyObservers()
}
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers[id] = observer
return id
}
func unsubscribe(_ observer: UUID) {
observers.removeValue(forKey: observer)
}
private func notifyObservers() {
for observer in observers.values {
observer(value)
}
}
}
// Example usage:
let observable = ObservableProperty(value: 0)
let observerId = observable.subscribe { value in
print("Observer received value: \(value)")
}
observable.wrappedValue = 1 // This will trigger the observer to print the new value.
observable.unsubscribe(observerId)
```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 {
var value: Value {
didSet {
observers.forEach { $0(value) }
}
}
private var observers: [UUID: (Value) -> Void] = [:]
required init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers[id] = observer
return id
}
func unsubscribe(_ observer: UUID) {
observers.removeValue(forKey: observer)
}
}```swift
protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
// Generic observable property that notifies observers of value changes.
class ObservableProperty<Value>: ObservablePropertyProtocol {
var value: Value {
didSet {
observers.forEach { $0(value) }
}
}
private var observers: [UUID: (Value) -> Void] = [:]
required init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers[id] = observer
return id
}
func unsubscribe(_ observer: UUID) {
observers.removeValue(forKey: observer)
}
}
// Example usage:
let observable = ObservableProperty(value: 0)
let observerId = observable.subscribe { print("Observer received value: \($0)") }
observable.value = 1
observable.value = 2
observable.unsubscribe(observerId)
observable.value = 3 // This will not trigger the observer because it was unsubscribed.
```observers.forEach { $0(value) } // cannot call value of non-function type 'Dictionary<UUID, (Value) -> Void>.Element' (aka '(key: UUID, value: (Value) -> ())')protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
class ObservableProperty<Value>: ObservablePropertyProtocol {
private var observers = [UUID: (Value) -> Void]()
private var value: Value
init(value: Value) {
self.value = value
}
var wrappedValue: Value {
get { return value }
set {
value = newValue
notifyObservers()
}
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers[id] = observer
return id
}
func unsubscribe(_ observer: UUID) {
observers.removeValue(forKey: observer)
}
private func notifyObservers() {
for observer in observers.values {
observer(value)
}
}
}```swift
protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
// Generic observable property that notifies observers of value changes.
class ObservableProperty<Value>: ObservablePropertyProtocol {
private var observers = [UUID: (Value) -> Void]()
private var value: Value
init(value: Value) {
self.value = value
}
var wrappedValue: Value {
get { return value }
set {
value = newValue
notifyObservers()
}
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers[id] = observer
return id
}
func unsubscribe(_ observer: UUID) {
observers.removeValue(forKey: observer)
}
private func notifyObservers() {
for observer in observers.values {
observer(value)
}
}
}
// Example usage:
let observable = ObservableProperty(value: 0)
let observerId = observable.subscribe { value in
print("Observer received value: \(value)")
}
observable.wrappedValue = 1 // This will trigger the observer to print the new value.
observable.unsubscribe(observerId)
```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 currentValue: Value
init(value: Value) {
self.currentValue = value
}
var value: Value {
get { return currentValue }
set {
currentValue = newValue
observers.values.forEach { $0(newValue) }
}
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers[id] = observer
return id
}
func unsubscribe(_ observer: UUID) {
observers.removeValue(forKey: observer)
}
}```swift
protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
// Generic observable property that notifies observers of value changes.
class ObservableProperty<Value>: ObservablePropertyProtocol {
private var observers: [UUID: (Value) -> Void] = [:]
private var currentValue: Value
init(value: Value) {
self.currentValue = value
}
var value: Value {
get { return currentValue }
set {
currentValue = newValue
observers.values.forEach { $0(newValue) }
}
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers[id] = observer
return id
}
func unsubscribe(_ observer: UUID) {
observers.removeValue(forKey: observer)
}
}
// Example usage:
let observable = ObservableProperty(value: 0)
let observerId = observable.subscribe { print("Observer received value: \($0)") }
observable.value = 1 // This will print "Observer received value: 1"
observable.unsubscribe(observerId)
observable.value = 2 // This will not print anything because the observer was unsubscribed
```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
observers.values.forEach { $0(newValue) }
}
}
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)
}
}```swift
protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
// Generic observable property that notifies observers of value changes.
class ObservableProperty<Value>: ObservablePropertyProtocol {
private var observers = [UUID: (Value) -> Void]()
private var _value: Value
var value: Value {
get { return _value }
set {
_value = newValue
observers.values.forEach { $0(newValue) }
}
}
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)
}
}
// Example usage:
let observable = ObservableProperty(value: 0)
let observerId = observable.subscribe { print("Observer received value: \($0)") }
observable.value = 1 // This will print "Observer received value: 1"
observable.unsubscribe(observerId)
observable.value = 2 // This will not print anything because the observer was unsubscribed
```init(value: Value) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ObservableProperty<Value>'protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
class ObservableProperty<Value>: ObservablePropertyProtocol {
private var observers = [UUID: (Value) -> Void]()
private var value: Value
init(value: Value) {
self.value = value
}
var wrappedValue: Value {
get { return value }
set {
value = newValue
notifyObservers()
}
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let observerId = UUID()
observers[observerId] = observer
return observerId
}
func unsubscribe(_ observerId: UUID) {
observers.removeValue(forKey: observerId)
}
private func notifyObservers() {
for observer in observers.values {
observer(value)
}
}
}```swift
protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
// Generic observable property that notifies observers of value changes.
class ObservableProperty<Value>: ObservablePropertyProtocol {
private var observers = [UUID: (Value) -> Void]()
private var value: Value
init(value: Value) {
self.value = value
}
var wrappedValue: Value {
get { return value }
set {
value = newValue
notifyObservers()
}
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let observerId = UUID()
observers[observerId] = observer
return observerId
}
func unsubscribe(_ observerId: UUID) {
observers.removeValue(forKey: observerId)
}
private func notifyObservers() {
for observer in observers.values {
observer(value)
}
}
}
// Example usage:
let observable = ObservableProperty(value: 0)
let observerId = observable.subscribe { value in
print("Observer received value: \(value)")
}
observable.wrappedValue = 1
observable.unsubscribe(observerId)
observable.wrappedValue = 2
```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 {
var value: Value {
didSet {
for observer in observers {
observer(value)
}
}
}
private var observers = [UUID: (Value) -> Void]()
required init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers[id] = observer
return id
}
func unsubscribe(_ observer: UUID) {
observers.removeValue(forKey: observer)
}
}```swift
protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
// Generic observable property that notifies observers of value changes.
class ObservableProperty<Value>: ObservablePropertyProtocol {
var value: Value {
didSet {
for observer in observers {
observer(value)
}
}
}
private var observers = [UUID: (Value) -> Void]()
required init(value: Value) {
self.value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers[id] = observer
return id
}
func unsubscribe(_ observer: UUID) {
observers.removeValue(forKey: observer)
}
}
// Example usage:
let observable = ObservableProperty(value: 0)
let observerId = observable.subscribe { value in
print("Observer received value: \(value)")
}
observable.value = 1
observable.value = 2
observable.unsubscribe(observerId)
observable.value = 3
```observer(value) // cannot call value of non-function type '(key: UUID, value: (Value) -> Void)'protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
class ObservableProperty<Value>: ObservablePropertyProtocol {
private var observers = [UUID: (Value) -> Void]()
private var value: Value
init(value: Value) {
self.value = value
}
var wrappedValue: Value {
get { return value }
set {
value = newValue
notifyObservers()
}
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers[id] = observer
return id
}
func unsubscribe(_ observer: UUID) {
observers.removeValue(forKey: observer)
}
private func notifyObservers() {
for observer in observers.values {
observer(value)
}
}
}```swift
protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
// Generic observable property that notifies observers of value changes.
class ObservableProperty<Value>: ObservablePropertyProtocol {
private var observers = [UUID: (Value) -> Void]()
private var value: Value
init(value: Value) {
self.value = value
}
var wrappedValue: Value {
get { return value }
set {
value = newValue
notifyObservers()
}
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let id = UUID()
observers[id] = observer
return id
}
func unsubscribe(_ observer: UUID) {
observers.removeValue(forKey: observer)
}
private func notifyObservers() {
for observer in observers.values {
observer(value)
}
}
}
// Example usage:
let observable = ObservableProperty(value: 0)
let observerId = observable.subscribe { value in
print("Observer received value: \(value)")
}
observable.wrappedValue = 1 // This will trigger the observer to print the new value.
observable.unsubscribe(observerId) // Unsubscribe the observer.
observable.wrappedValue = 2 // This will not trigger any observer since it has been unsubscribed.
```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
notifyObservers()
}
}
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)
}
private func notifyObservers() {
for observer in observers.values {
observer(value)
}
}
}```swift
protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
// Generic observable property that notifies observers of value changes.
class ObservableProperty<Value>: ObservablePropertyProtocol {
private var observers = [UUID: (Value) -> Void]()
private var _value: Value
var value: Value {
get { return _value }
set {
_value = newValue
notifyObservers()
}
}
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)
}
private func notifyObservers() {
for observer in observers.values {
observer(value)
}
}
}
// Example usage:
let observable = ObservableProperty(value: 0)
let observerId = observable.subscribe { value in
print("Observer received value: \(value)")
}
observable.value = 1 // This will trigger the observer to print the new value.
observable.unsubscribe(observerId)
observable.value = 2 // This will not trigger the unsubscribed observer.
```init(value: Value) { // initializer requirement 'init(value:)' can only be satisfied by a 'required' initializer in non-final class 'ObservableProperty<Value>'protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
class ObservableProperty<Value>: ObservablePropertyProtocol {
private var observers: [UUID: (Value) -> Void] = [:]
private var _value: Value
var value: Value {
get { return _value }
set {
_value = newValue
notifyObservers()
}
}
init(value: Value) {
self._value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
return uuid
}
func unsubscribe(_ observer: UUID) {
observers.removeValue(forKey: observer)
}
private func notifyObservers() {
for observer in observers.values {
observer(value)
}
}
}```swift
protocol ObservablePropertyProtocol {
associatedtype Value
init(value: Value)
var value: Value { get set }
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID
func unsubscribe(_ observer: UUID)
}
// Generic observable property that notifies observers of value changes.
class ObservableProperty<Value>: ObservablePropertyProtocol {
private var observers: [UUID: (Value) -> Void] = [:]
private var _value: Value
var value: Value {
get { return _value }
set {
_value = newValue
notifyObservers()
}
}
init(value: Value) {
self._value = value
}
func subscribe(_ observer: @escaping (Value) -> Void) -> UUID {
let uuid = UUID()
observers[uuid] = observer
return uuid
}
func unsubscribe(_ observer: UUID) {
observers.removeValue(forKey: observer)
}
private func notifyObservers() {
for observer in observers.values {
observer(value)
}
}
}
// Example usage:
let observable = ObservableProperty(value: 0)
let observerId = observable.subscribe { value in
print("Observer received value: \(value)")
}
observable.value = 1 // This will trigger the observer to print the new value.
observable.unsubscribe(observerId)
```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 {
private var value: Value
private let range: ClosedRange<Value>
var wrappedValue: Value {
get { value }
set { value = min(max(newValue, range.lowerBound), range.upperBound) }
}
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = min(max(wrappedValue, range.lowerBound), range.upperBound)
self.range = range
}
}
struct Temperature {
@Clamped(0...100) var value: 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>
var wrappedValue: Value {
get { value }
set { value = min(max(newValue, range.lowerBound), range.upperBound) }
}
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = min(max(wrappedValue, range.lowerBound), range.upperBound)
self.range = range
}
}
// Example usage:
struct Temperature {
@Clamped(0...100) var value: Int
}
var temp = Temperature(value: 150)
print(temp.value) // Output: 100
temp.value = -20
print(temp.value) // Output: 0
```@Clamped(0...100) var value: 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>
var wrappedValue: Value {
get { value }
set { value = min(max(newValue, range.lowerBound), range.upperBound) }
}
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = min(max(wrappedValue, range.lowerBound), range.upperBound)
self.range = range
}
}
struct Temperature {
@Clamped(range: 0...100)
var value: Int
init(value: Int) {
self.value = value
}
}```swift
protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
private var value: Value
private let range: ClosedRange<Value>
var wrappedValue: Value {
get { value }
set { value = min(max(newValue, range.lowerBound), range.upperBound) }
}
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = min(max(wrappedValue, range.lowerBound), range.upperBound)
self.range = range
}
}
// Example usage:
struct Temperature {
@Clamped(range: 0...100)
var value: Int
init(value: Int) {
self.value = value
}
}
var temp = Temperature(value: 150) // This will be clamped to 100
print(temp.value) // Output: 100
temp.value = -10 // This will be clamped to 0
print(temp.value) // Output: 0
```@Clamped(range: 0...100) // missing argument for parameter 'wrappedValue' in call@Clamped(range: 0...100) // extraneous argument label 'range:' 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>
var wrappedValue: Value {
get { return value }
set { value = min(max(newValue, range.lowerBound), range.upperBound) }
}
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = min(max(wrappedValue, range.lowerBound), range.upperBound)
self.range = range
}
}
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>
var wrappedValue: Value {
get { return value }
set { value = min(max(newValue, range.lowerBound), range.upperBound) }
}
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = min(max(wrappedValue, range.lowerBound), range.upperBound)
self.range = range
}
}
// Example usage:
struct Point {
@Clamped(0...100) var x: Int
@Clamped(0...100) var y: Int
}
var point = Point(x: 150, y: -50)
print(point.x) // Output: 100
print(point.y) // Output: 0
point.x = 200
point.y = 200
print(point.x) // Output: 100
print(point.y) // Output: 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 {
private var value: Value
private let range: ClosedRange<Value>
var wrappedValue: Value {
get { value }
set { value = min(max(newValue, range.lowerBound), range.upperBound) }
}
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = min(max(wrappedValue, range.lowerBound), range.upperBound)
self.range = range
}
}
struct Temperature {
@Clamped(range: 0...100)
var value: 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>
var wrappedValue: Value {
get { value }
set { value = min(max(newValue, range.lowerBound), range.upperBound) }
}
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = min(max(wrappedValue, range.lowerBound), range.upperBound)
self.range = range
}
}
// Example usage:
struct Temperature {
@Clamped(range: 0...100)
var value: Int
}
var temp = Temperature(value: 150)
print(temp.value) // Output: 100
temp.value = -10
print(temp.value) // Output: 0
```@Clamped(range: 0...100) // missing argument for parameter 'wrappedValue' in call@Clamped(range: 0...100) // extraneous argument label 'range:' 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>
var wrappedValue: Value {
get { value }
set { value = min(max(newValue, range.lowerBound), range.upperBound) }
}
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = min(max(wrappedValue, range.lowerBound), range.upperBound)
self.range = range
}
}
struct Configuration {
@Clamped(wrappedValue: 10, 0...100)
var threshold: 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>
var wrappedValue: Value {
get { value }
set { value = min(max(newValue, range.lowerBound), range.upperBound) }
}
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = min(max(wrappedValue, range.lowerBound), range.upperBound)
self.range = range
}
}
// Example usage:
struct Configuration {
@Clamped(wrappedValue: 10, 0...100)
var threshold: Int
}
var config = Configuration()
print(config.threshold) // Output: 10
config.threshold = 150
print(config.threshold) // Output: 100 (clamped to the upper bound)
config.threshold = -20
print(config.threshold) // Output: 0 (clamped to the lower bound)
```protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
private var value: Value
private let range: ClosedRange<Value>
var wrappedValue: Value {
get { value }
set { value = min(max(newValue, range.lowerBound), range.upperBound) }
}
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = min(max(wrappedValue, range.lowerBound), range.upperBound)
self.range = range
}
}
struct Configuration {
@Clamped(wrappedValue: 10, 0...100)
var threshold: 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>
var wrappedValue: Value {
get { value }
set { value = min(max(newValue, range.lowerBound), range.upperBound) }
}
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = min(max(wrappedValue, range.lowerBound), range.upperBound)
self.range = range
}
}
// Example usage:
struct Configuration {
@Clamped(wrappedValue: 10, 0...100)
var threshold: Int
}
var config = Configuration()
print(config.threshold) // Output: 10
config.threshold = 150 // This will be clamped to 100
print(config.threshold) // Output: 100
config.threshold = -20 // This will be clamped to 0
print(config.threshold) // Output: 0
```protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
private var value: Value
private let range: ClosedRange<Value>
var wrappedValue: Value {
get { value }
set { value = min(max(newValue, range.lowerBound), range.upperBound) }
}
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = min(max(wrappedValue, range.lowerBound), range.upperBound)
self.range = range
}
}
struct Configuration {
@Clamped(wrappedValue: 10, 0...100)
var maxItems: Int
@Clamped(wrappedValue: 1.5, 0.0...5.0)
var threshold: Double
}```swift
protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
private var value: Value
private let range: ClosedRange<Value>
var wrappedValue: Value {
get { value }
set { value = min(max(newValue, range.lowerBound), range.upperBound) }
}
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = min(max(wrappedValue, range.lowerBound), range.upperBound)
self.range = range
}
}
// Example usage:
struct Configuration {
@Clamped(wrappedValue: 10, 0...100)
var maxItems: Int
@Clamped(wrappedValue: 1.5, 0.0...5.0)
var threshold: Double
}
var config = Configuration()
print(config.maxItems) // Output: 10
print(config.threshold) // Output: 1.5
config.maxItems = 150
config.threshold = -0.5
print(config.maxItems) // Output: 100
print(config.threshold) // Output: 0.0
```protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
private var value: Value
private let range: ClosedRange<Value>
var wrappedValue: Value {
get { value }
set { value = min(max(newValue, range.lowerBound), range.upperBound) }
}
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = min(max(wrappedValue, range.lowerBound), range.upperBound)
self.range = range
}
}
struct Configuration {
@Clamped(wrappedValue: 10, 0...100)
var threshold: 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>
var wrappedValue: Value {
get { value }
set { value = min(max(newValue, range.lowerBound), range.upperBound) }
}
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = min(max(wrappedValue, range.lowerBound), range.upperBound)
self.range = range
}
}
// Example usage:
struct Configuration {
@Clamped(wrappedValue: 10, 0...100)
var threshold: Int
}
var config = Configuration()
print(config.threshold) // Output: 10
config.threshold = 200
print(config.threshold) // Output: 100 (clamped to upper bound)
config.threshold = -5
print(config.threshold) // Output: 0 (clamped to lower bound)
```protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<Value: Comparable>: ClampedProtocol {
private var value: Value
private let range: ClosedRange<Value>
var wrappedValue: Value {
get { value }
set { value = min(max(newValue, range.lowerBound), range.upperBound) }
}
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = min(max(wrappedValue, range.lowerBound), range.upperBound)
self.range = range
}
}
struct Configuration {
@Clamped(wrappedValue: 10, 0...100)
var threshold: 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>
var wrappedValue: Value {
get { value }
set { value = min(max(newValue, range.lowerBound), range.upperBound) }
}
init(wrappedValue: Value, _ range: ClosedRange<Value>) {
self.value = min(max(wrappedValue, range.lowerBound), range.upperBound)
self.range = range
}
}
// Example usage:
struct Configuration {
@Clamped(wrappedValue: 10, 0...100)
var threshold: Int
}
var config = Configuration()
print(config.threshold) // Output: 10
config.threshold = 150
print(config.threshold) // Output: 100
config.threshold = -20
print(config.threshold) // Output: 0
```protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
@propertyWrapper
struct Clamped<T: Comparable>: ClampedProtocol {
var wrappedValue: T
let range: ClosedRange<T>
init(wrappedValue: T, _ range: ClosedRange<T>) {
self.wrappedValue = min(max(wrappedValue, range.lowerBound), range.upperBound)
self.range = range
}
}
struct Configuration {
@Clamped(wrappedValue: 10, 0...100)
var maxValue: Int
@Clamped(wrappedValue: 20.5, 0...100.0)
var maxFloatValue: Float
}
func main() {
var config = Configuration()
print(config.maxValue) // Output: 10
print(config.maxFloatValue) // Output: 20.5
config.maxValue = 200
config.maxFloatValue = -10.0
print(config.maxValue) // Output: 100
print(config.maxFloatValue) // Output: 0.0
}```swift
protocol ClampedProtocol {
associatedtype Value: Comparable
init(wrappedValue: Value, _ range: ClosedRange<Value>)
}
// Property wrapper that clamps value within a specified range.
@propertyWrapper
struct Clamped<T: Comparable>: ClampedProtocol {
var wrappedValue: T
let range: ClosedRange<T>
init(wrappedValue: T, _ range: ClosedRange<T>) {
self.wrappedValue = min(max(wrappedValue, range.lowerBound), range.upperBound)
self.range = range
}
}
// Example usage of the Clamped property wrapper.
struct Configuration {
@Clamped(wrappedValue: 10, 0...100)
var maxValue: Int
@Clamped(wrappedValue: 20.5, 0...100.0)
var maxFloatValue: Float
}
// Main function to test the Clamped property wrapper.
func main() {
var config = Configuration()
print(config.maxValue) // Output: 10
print(config.maxFloatValue) // Output: 20.5
config.maxValue = 200
config.maxFloatValue = -10.0
print(config.maxValue) // Output: 100
print(config.maxFloatValue) // Output: 0.0
}
main()
``` // XCTAssertEqual failed: (15) is not equal to (10)enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<Value>: LoggedProtocol {
private var value: Value
private let logger: (Event, Value) -> Void
var wrappedValue: Value {
get {
logger(.get, value)
return value
}
set {
logger(.set, newValue)
value = newValue
}
}
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.value = wrappedValue
self.logger = logger
}
}
class MyClass {
@Logged(wrappedValue: 0) var myProperty: Int
init() {
myProperty = 10
print("Initial value: \(myProperty)")
}
func modifyProperty() {
myProperty = 20
print("Modified value: \(myProperty)")
}
}
func logEvent(_ event: Event, _ value: Int) {
switch event {
case .get:
print("Getting value: \(value)")
case .set:
print("Setting value: \(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 {
private var value: Value
private let logger: (Event, Value) -> Void
var wrappedValue: Value {
get {
logger(.get, value)
return value
}
set {
logger(.set, newValue)
value = newValue
}
}
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.value = wrappedValue
self.logger = logger
}
}
// Example usage:
class MyClass {
@Logged(wrappedValue: 0) var myProperty: Int
init() {
myProperty = 10
print("Initial value: \(myProperty)")
}
func modifyProperty() {
myProperty = 20
print("Modified value: \(myProperty)")
}
}
// Logger function that prints the event and the value
func logEvent(_ event: Event, _ value: Int) {
switch event {
case .get:
print("Getting value: \(value)")
case .set:
print("Setting value: \(value)")
}
}
// Create an instance of MyClass with a custom logger
let myInstance = MyClass()
myInstance.modifyProperty()
```@Logged(wrappedValue: 0) var myProperty: Int // missing argument for parameter 'logger' in callenum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<Value>: LoggedProtocol {
private var value: Value
private let logger: (Event, Value) -> Void
var wrappedValue: Value {
get {
logger(.get, value)
return value
}
set {
logger(.set, newValue)
value = newValue
}
}
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.value = wrappedValue
self.logger = logger
}
}
class Example {
@Logged(wrappedValue: 0) var count: Int
init() {
// Define a logger function that prints the event and the value
let logger: (Event, Int) -> Void = { event, value in
switch event {
case .get:
print("Getting count: \(value)")
case .set:
print("Setting count to: \(value)")
}
}
// Set the logger function for the count property
_count.logger = logger
}
}```swift
enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value>: LoggedProtocol {
private var value: Value
private let logger: (Event, Value) -> Void
var wrappedValue: Value {
get {
logger(.get, value)
return value
}
set {
logger(.set, newValue)
value = newValue
}
}
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.value = wrappedValue
self.logger = logger
}
}
// Example usage:
class Example {
@Logged(wrappedValue: 0) var count: Int
init() {
// Define a logger function that prints the event and the value
let logger: (Event, Int) -> Void = { event, value in
switch event {
case .get:
print("Getting count: \(value)")
case .set:
print("Setting count to: \(value)")
}
}
// Set the logger function for the count property
_count.logger = logger
}
}
// Create an instance of the Example class
let example = Example()
// Access and modify the count property
example.count = 10
print(example.count)
```@Logged(wrappedValue: 0) var count: Int // missing argument for parameter 'logger' 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
private let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Logged<Value> { self }
var wrappedValue: Value {
get {
logger(.get, wrappedValue)
return wrappedValue
}
set {
logger(.set, newValue)
wrappedValue = newValue
}
}
}
struct User {
@Logged(logger: { event, value in
print("User property accessed: \(event) with value \(value)")
})
var name: String
@Logged(logger: { event, value in
print("User property accessed: \(event) with value \(value)")
})
var age: Int
}```swift
enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value>: LoggedProtocol {
var wrappedValue: Value
private let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Logged<Value> { self }
var wrappedValue: Value {
get {
logger(.get, wrappedValue)
return wrappedValue
}
set {
logger(.set, newValue)
wrappedValue = newValue
}
}
}
// Example usage:
struct User {
@Logged(logger: { event, value in
print("User property accessed: \(event) with value \(value)")
})
var name: String
@Logged(logger: { event, value in
print("User property accessed: \(event) with value \(value)")
})
var age: Int
}
var user = User(name: "John", age: 30)
print(user.name) // Output: User property accessed: get with value John
user.name = "Jane" // Output: User property accessed: set with value Jane
print(user.age) // Output: User property accessed: get with value 30
user.age = 31 // Output: User property accessed: set with value 31
```struct Logged<Value>: LoggedProtocol { // property wrapper type 'Logged' has multiple non-static properties named 'wrappedValue'var wrappedValue: Value { // invalid redeclaration of 'wrappedValue'enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<Value>: LoggedProtocol {
var wrappedValue: Value
private let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Logged<Value> { self }
subscript<T>(dynamicMember keyPath: WritableKeyPath<Value, T>) -> T {
get {
logger(.get, wrappedValue)
return wrappedValue[keyPath: keyPath]
}
set {
logger(.set, newValue)
wrappedValue[keyPath: keyPath] = newValue
}
}
}
struct User {
@Logged(logger: { event, value in
switch event {
case .get:
print("Getting user: \(value)")
case .set:
print("Setting user: \(value)")
}
})
var name: String
@Logged(logger: { event, value in
switch event {
case .get:
print("Getting age: \(value)")
case .set:
print("Setting age: \(value)")
}
})
var age: Int
}```swift
enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value>: LoggedProtocol {
var wrappedValue: Value
private let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Logged<Value> { self }
subscript<T>(dynamicMember keyPath: WritableKeyPath<Value, T>) -> T {
get {
logger(.get, wrappedValue)
return wrappedValue[keyPath: keyPath]
}
set {
logger(.set, newValue)
wrappedValue[keyPath: keyPath] = newValue
}
}
}
// Example usage:
struct User {
@Logged(logger: { event, value in
switch event {
case .get:
print("Getting user: \(value)")
case .set:
print("Setting user: \(value)")
}
})
var name: String
@Logged(logger: { event, value in
switch event {
case .get:
print("Getting age: \(value)")
case .set:
print("Setting age: \(value)")
}
})
var age: Int
}
var user = User(name: "John", age: 30)
print(user.name) // Output: Getting user: John
print(user.age) // Output: Getting age: 30
user.name = "Jane" // Output: Setting user: Jane
user.age = 25 // Output: Setting age: 25
```logger(.set, newValue) // cannot convert value of type 'T' to expected argument type 'Value'@Logged(logger: { event, value in // missing argument for parameter 'wrappedValue' in call@Logged(logger: { event, value in // missing argument for parameter 'wrappedValue' in callenum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<Value>: LoggedProtocol {
var wrappedValue: Value
private let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Logged<Value> { self }
subscript<T>(dynamicMember keyPath: WritableKeyPath<Value, T>) -> T {
get {
logger(.get, wrappedValue)
return wrappedValue[keyPath: keyPath]
}
set {
logger(.set, newValue)
wrappedValue[keyPath: keyPath] = newValue
}
}
}
struct User {
@Logged(logger: { event, value in
switch event {
case .get:
print("User.name accessed with value: \(value)")
case .set:
print("User.name set to: \(value)")
}
})
var name: String
init(name: String) {
self.name = name
}
}```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
private let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Logged<Value> { self }
subscript<T>(dynamicMember keyPath: WritableKeyPath<Value, T>) -> T {
get {
logger(.get, wrappedValue)
return wrappedValue[keyPath: keyPath]
}
set {
logger(.set, newValue)
wrappedValue[keyPath: keyPath] = newValue
}
}
}
// Example usage:
struct User {
@Logged(logger: { event, value in
switch event {
case .get:
print("User.name accessed with value: \(value)")
case .set:
print("User.name set to: \(value)")
}
})
var name: String
init(name: String) {
self.name = name
}
}
var user = User(name: "John")
print(user.name) // Output: User.name accessed with value: John
user.name = "Jane" // Output: User.name set to: Jane
```logger(.set, newValue) // cannot convert value of type 'T' to expected argument type 'Value'@Logged(logger: { event, value in // missing argument for parameter 'wrappedValue' in callenum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<Value>: LoggedProtocol {
var wrappedValue: Value
private let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Logged<Value> { self }
subscript<T>(dynamicMember keyPath: WritableKeyPath<Value, T>) -> T {
get {
logger(.get, wrappedValue)
return wrappedValue[keyPath: keyPath]
}
set {
logger(.set, newValue)
wrappedValue[keyPath: keyPath] = newValue
}
}
}
func logEvent(_ event: Event, _ value: Any) {
print("Event: \(event), Value: \(value)")
}
struct User {
@Logged(logger: logEvent) var name: String
@Logged(logger: logEvent) var age: Int
}```swift
enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value>: LoggedProtocol {
var wrappedValue: Value
private let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Logged<Value> { self }
subscript<T>(dynamicMember keyPath: WritableKeyPath<Value, T>) -> T {
get {
logger(.get, wrappedValue)
return wrappedValue[keyPath: keyPath]
}
set {
logger(.set, newValue)
wrappedValue[keyPath: keyPath] = newValue
}
}
}
// Example usage:
func logEvent(_ event: Event, _ value: Any) {
print("Event: \(event), Value: \(value)")
}
struct User {
@Logged(logger: logEvent) var name: String
@Logged(logger: logEvent) var age: Int
}
var user = User(name: "John", age: 30)
// Accessing and modifying properties
print(user.name) // Output: Event: get, Value: John
user.name = "Jane" // Output: Event: set, Value: Jane
print(user.age) // Output: Event: get, Value: 30
user.age = 31 // Output: Event: set, Value: 31
```logger(.set, newValue) // cannot convert value of type 'T' to expected argument type 'Value'@Logged(logger: logEvent) var name: String // missing argument for parameter 'wrappedValue' in call@Logged(logger: logEvent) 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 {
private var value: Value
private let logger: (Event, Value) -> Void
var wrappedValue: Value {
get {
logger(.get, value)
return value
}
set {
logger(.set, newValue)
value = newValue
}
}
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.value = wrappedValue
self.logger = logger
}
}
struct User {
@Logged(wrappedValue: "John Doe") var name: String
func log() {
print("Logged events:")
name = "Jane Doe"
print(name)
}
}```swift
enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value>: LoggedProtocol {
private var value: Value
private let logger: (Event, Value) -> Void
var wrappedValue: Value {
get {
logger(.get, value)
return value
}
set {
logger(.set, newValue)
value = newValue
}
}
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.value = wrappedValue
self.logger = logger
}
}
// Example usage:
struct User {
@Logged(wrappedValue: "John Doe") var name: String
func log() {
print("Logged events:")
name = "Jane Doe"
print(name)
}
}
let user = User()
user.log()
```@Logged(wrappedValue: "John Doe") var name: String // missing argument for parameter 'logger' in callname = "Jane Doe" // cannot assign to property: 'self' is immutableenum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<Value>: LoggedProtocol {
var wrappedValue: Value
private let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Logged<Value> { self }
subscript<T>(dynamicMember keyPath: WritableKeyPath<Value, T>) -> T {
get {
logger(.get, wrappedValue)
return wrappedValue[keyPath: keyPath]
}
set {
logger(.set, newValue)
wrappedValue[keyPath: keyPath] = newValue
}
}
}
func main() {
var loggedValue = Logged(wrappedValue: 10) { event, value in
print("Event: \(event), Value: \(value)")
}
loggedValue.wrappedValue = 20 // This will log "Event: set, Value: 20"
print(loggedValue.wrappedValue) // This will log "Event: get, Value: 20" and print "20"
}```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
private let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Logged<Value> { self }
subscript<T>(dynamicMember keyPath: WritableKeyPath<Value, T>) -> T {
get {
logger(.get, wrappedValue)
return wrappedValue[keyPath: keyPath]
}
set {
logger(.set, newValue)
wrappedValue[keyPath: keyPath] = newValue
}
}
}
// Example usage:
func main() {
var loggedValue = Logged(wrappedValue: 10) { event, value in
print("Event: \(event), Value: \(value)")
}
loggedValue.wrappedValue = 20 // This will log "Event: set, Value: 20"
print(loggedValue.wrappedValue) // This will log "Event: get, Value: 20" and print "20"
}
main()
```logger(.set, newValue) // cannot convert value of type 'T' to expected argument type 'Value'enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<Value>: LoggedProtocol {
private var value: Value
private let logger: (Event, Value) -> Void
var wrappedValue: Value {
get {
logger(.get, value)
return value
}
set {
logger(.set, newValue)
value = newValue
}
}
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.value = wrappedValue
self.logger = logger
}
}
class MyClass {
@Logged(wrappedValue: 0) var myProperty: Int
init() {
// Logger function that prints the event and the value
myProperty.logger = { event, value in
print("Event: \(event), Value: \(value)")
}
}
}
func main() {
let myInstance = MyClass()
myInstance.myProperty = 10 // This will log "Event: set, Value: 10"
print(myInstance.myProperty) // This will log "Event: get, Value: 10" and print "10"
}```swift
enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
// Property wrapper that logs access and modification of the wrapped property.
@propertyWrapper
struct Logged<Value>: LoggedProtocol {
private var value: Value
private let logger: (Event, Value) -> Void
var wrappedValue: Value {
get {
logger(.get, value)
return value
}
set {
logger(.set, newValue)
value = newValue
}
}
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.value = wrappedValue
self.logger = logger
}
}
// Example usage:
class MyClass {
@Logged(wrappedValue: 0) var myProperty: Int
init() {
// Logger function that prints the event and the value
myProperty.logger = { event, value in
print("Event: \(event), Value: \(value)")
}
}
}
// Main function to test the generated code
func main() {
let myInstance = MyClass()
myInstance.myProperty = 10 // This will log "Event: set, Value: 10"
print(myInstance.myProperty) // This will log "Event: get, Value: 10" and print "10"
}
main()
```@Logged(wrappedValue: 0) var myProperty: Int // missing argument for parameter 'logger' in callmyProperty.logger = { event, value in // value of type 'Int' has no member 'logger'enum Event {
case get, set
}
protocol LoggedProtocol {
associatedtype Value
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void)
}
@propertyWrapper
struct Logged<Value>: LoggedProtocol {
var wrappedValue: Value
private let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Logged<Value> { self }
subscript(position: Int) -> Value {
get {
logger(.get, wrappedValue)
return wrappedValue
}
set {
logger(.set, newValue)
wrappedValue = newValue
}
}
}
func main() {
var loggedValue: Logged<Int> = Logged(wrappedValue: 10) { event, value in
switch event {
case .get:
print("Getting value: \(value)")
case .set:
print("Setting value: \(value)")
}
}
loggedValue.wrappedValue = 20 // Logs "Setting value: 20"
print(loggedValue.wrappedValue) // Logs "Getting value: 20" and prints "20"
}```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
private let logger: (Event, Value) -> Void
init(wrappedValue: Value, logger: @escaping (Event, Value) -> Void) {
self.wrappedValue = wrappedValue
self.logger = logger
}
var projectedValue: Logged<Value> { self }
subscript(position: Int) -> Value {
get {
logger(.get, wrappedValue)
return wrappedValue
}
set {
logger(.set, newValue)
wrappedValue = newValue
}
}
}
// Example usage:
func main() {
var loggedValue: Logged<Int> = Logged(wrappedValue: 10) { event, value in
switch event {
case .get:
print("Getting value: \(value)")
case .set:
print("Setting value: \(value)")
}
}
loggedValue.wrappedValue = 20 // Logs "Setting value: 20"
print(loggedValue.wrappedValue) // Logs "Getting value: 20" and prints "20"
}
main()
``` // 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
private var searchBarText: String = ""
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchBarText.append(character)
return nil
case .keyboardDeleteBackwards:
searchBarText = String(searchBarText.dropLast())
return nil
case .searchButtonPress:
guard !searchBarText.isEmpty else { return nil }
do {
let forecast = try provider.forecast(for: searchBarText)
return .success(city: searchBarText, forecast: forecast)
} catch {
return .failure(city: searchBarText)
}
}
}
}
class WeatherProviderImpl: WeatherProvider {
func forecast(for city: String) throws -> String {
// Fetch forecast from external API.
// Return forecast string.
return "Sunny"
}
}```swift
protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
private var searchBarText: String = ""
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchBarText.append(character)
return nil
case .keyboardDeleteBackwards:
searchBarText = String(searchBarText.dropLast())
return nil
case .searchButtonPress:
guard !searchBarText.isEmpty else { return nil }
do {
let forecast = try provider.forecast(for: searchBarText)
return .success(city: searchBarText, forecast: forecast)
} catch {
return .failure(city: searchBarText)
}
}
}
}
// Weather provider implementation.
// Fetch forecast from external API.
class WeatherProviderImpl: WeatherProvider {
func forecast(for city: String) throws -> String {
// Fetch forecast from external API.
// Return forecast string.
return "Sunny"
}
}
// Weather application usage.
let weatherProvider = WeatherProviderImpl()
let weatherApplication = WeatherApplication(provider: weatherProvider)
let feedback = weatherApplication.handle(action: .keyboardCharacterSelect("S"))
print(feedback) // nil
let feedback2 = weatherApplication.handle(action: .keyboardCharacterSelect("a"))
print(feedback2) // nil
let feedback3 = weatherApplication.handle(action: .keyboardCharacterSelect("n"))
print(feedback3) // nil
let feedback4 = weatherApplication.handle(action: .keyboardCharacterSelect("n"))
print(feedback4) // nil
let feedback5 = weatherApplication.handle(action: .keyboardCharacterSelect("y"))
print(feedback5) // nil
let feedback6 = weatherApplication.handle(action: .searchButtonPress)
print(feedback6) // success(city: "Sanny", forecast: "Sunny")
```protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
private var searchBarText: String = ""
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchBarText.append(character)
case .keyboardDeleteBackwards:
searchBarText.removeLast()
case .searchButtonPress:
guard !searchBarText.isEmpty else { return nil }
do {
let forecast = try provider.forecast(for: searchBarText)
return .success(city: searchBarText, forecast: forecast)
} catch {
return .failure(city: searchBarText)
}
}
return nil
}
}```swift
protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
private var searchBarText: String = ""
required 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:
guard !searchBarText.isEmpty else { return nil }
do {
let forecast = try provider.forecast(for: searchBarText)
return .success(city: searchBarText, forecast: forecast)
} catch {
return .failure(city: searchBarText)
}
}
return nil
}
}
// MARK: - Tests
let weatherProvider = MockWeatherProvider()
let weatherApplication = WeatherApplication(provider: weatherProvider)
// Test 1: Search for "London"
let feedback1 = weatherApplication.handle(action: .keyboardCharacterSelect("L"))
let feedback2 = weatherApplication.handle(action: .keyboardCharacterSelect("o"))
let feedback3 = weatherApplication.handle(action: .keyboardCharacterSelect("n"))
let feedback4 = weatherApplication.handle(action: .keyboardCharacterSelect("d"))
let feedback5 = weatherApplication.handle(action: .keyboardCharacterSelect("o"))
let feedback6 = weatherApplication.handle(action: .keyboardCharacterSelect("n"))
let feedback7 = weatherApplication.handle(action: .searchButtonPress)
print(feedback1) // nil
print(feedback2) // nil
print(feedback3) // nil
print(feedback4) // nil
print(feedback5) // nil
print(feedback6) // nil
print(feedback7) // success(city: "London", forecast: "It's sunny")
// Test 2: Search for "New York"
let feedback8 = weatherApplication.handle(action: .keyboardCharacterSelect("N"))
let feedback9 = weatherApplication.handle(action: .keyboardCharacterSelect("e"))
let feedback10 = weatherApplication.handle(action: .keyboardCharacterSelect("w"))
let feedback11 = weatherApplication.handle(action: .keyboardCharacterSelect(" "))
let feedback12 = weatherApplication.handle(action: .keyboardCharacterSelect("Y"))
let feedback13 = weatherApplication.handle(action: .keyboardCharacterSelect("o"))
let feedback14 = weatherApplication.handle(action: .keyboardCharacterSelect("r"))
let feedback15 = weatherApplication.handle(action: .keyboardCharacterSelect("k"))
let feedback16 = weatherApplication.handle(action: .searchButtonPress)
print(feedback8) // nil
print(feedback9) // nil
print(feedback10) // nil
print(feedback11) // nil
print(feedback12) // nil
print(feedback13) // nil
print(feedback14) // nil
print(feedback15) // nil
print(feedback16) // success(city: "New York", forecast: "It's rainy")
// Test 3: Search for "Paris"
let feedback17 = weatherApplication.handle(action: .keyboardCharacterSelect("P"))
let feedback18 = weatherApplication.handle(action: .keyboardCharacterSelect("a"))
let feedback19 = weatherApplication.handle(action: .keyboardCharacterSelect("r"))
let feedback20 = weatherApplication.handle(action: .keyboardCharacterSelect("i"))
let feedback21 = weatherApplication.handle(action: .keyboardCharacterSelect("s"))
let feedback22 = weatherApplication.handle(action: .searchButtonPress)
print(feedback17) // nil
print(feedback18) // nil
print(feedback19) // nil
print(feedback20) // nil
print(feedback21) // nil
print(feedback22) // failure(city: "Paris")
// MARK: - Mock Weather Provider
class MockWeatherProvider: WeatherProvider {
func forecast(for city: String) throws -> String {
switch city {
case "London":
return "It's sunny"
case "New York":
return "It'sprotocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
private var searchBarText: String = ""
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchBarText.append(character)
case .keyboardDeleteBackwards:
searchBarText.removeLast()
case .searchButtonPress:
guard !searchBarText.isEmpty else { return nil }
do {
let forecast = try provider.forecast(for: searchBarText)
return .success(city: searchBarText, forecast: forecast)
} catch {
return .failure(city: searchBarText)
}
}
return nil
}
}
class WeatherProviderMock: WeatherProvider {
func forecast(for city: String) throws -> String {
if city == "London" {
return "It's going to rain"
} else if city == "New York" {
return "It's going to snow"
} else {
throw NSError(domain: "WeatherProviderMock", code: 0, userInfo: nil)
}
}
}```swift
protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
private var searchBarText: String = ""
required 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:
guard !searchBarText.isEmpty else { return nil }
do {
let forecast = try provider.forecast(for: searchBarText)
return .success(city: searchBarText, forecast: forecast)
} catch {
return .failure(city: searchBarText)
}
}
return nil
}
}
// MARK: - WeatherProvider
class WeatherProviderMock: WeatherProvider {
func forecast(for city: String) throws -> String {
if city == "London" {
return "It's going to rain"
} else if city == "New York" {
return "It's going to snow"
} else {
throw NSError(domain: "WeatherProviderMock", code: 0, userInfo: nil)
}
}
}
// MARK: - WeatherApplication
let weatherProvider = WeatherProviderMock()
let weatherApplication = WeatherApplication(provider: weatherProvider)
weatherApplication.handle(action: .keyboardCharacterSelect("L"))
weatherApplication.handle(action: .keyboardCharacterSelect("o"))
weatherApplication.handle(action: .keyboardCharacterSelect("n"))
weatherApplication.handle(action: .keyboardCharacterSelect("d"))
weatherApplication.handle(action: .searchButtonPress)
// => .success(city: "London", forecast: "It's going to rain")
weatherApplication.handle(action: .keyboardDeleteBackwards)
weatherApplication.handle(action: .keyboardDeleteBackwards)
weatherApplication.handle(action: .keyboardDeleteBackwards)
weatherApplication.handle(action: .keyboardDeleteBackwards)
weatherApplication.handle(action: .keyboardCharacterSelect("N"))
weatherApplication.handle(action: .keyboardCharacterSelect("e"))
weatherApplication.handle(action: .keyboardCharacterSelect("w"))
weatherApplication.handle(action: .keyboardCharacterSelect(" "))
weatherApplication.handle(action: .keyboardCharacterSelect("Y"))
weatherApplication.handle(action: .keyboardCharacterSelect("o"))
weatherApplication.handle(action: .keyboardCharacterSelect("r"))
weatherApplication.handle(action: .keyboardCharacterSelect("k"))
weatherApplication.handle(action: .searchButtonPress)
// => .success(city: "New York", forecast: "It's going to snow")
weatherApplication.handle(action: .keyboardDeleteBackwards)
weatherApplication.handle(action: .keyboardDeleteBackwards)
weatherApplication.handle(action: .keyboardDeleteBackwards)
weatherApplication.handle(action: .keyboardDeleteBackwards)
weatherApplication.handle(action: .keyboardDeleteBackwards)
weatherApplication.handle(action: .keyboardDeleteBackwards)
weatherApplication.handle(action: .keyboardDeleteBackwards)
weatherApplication.handle(action: .keyboardDeleteBackwards)
weatherApplication.handle(action: .keyboardDeleteBackwards)
weatherApplication.handle(action: .keyboardDeleteBackwards)
weatherApplication.handle(action: .keyboardDeleteBackwards)
weatherApplication.handle(action: .searchButtonPress)
// => .failure(city: "")
```protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
private var searchBarText: String = ""
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchBarText.append(character)
case .keyboardDeleteBackwards:
searchBarText.removeLast()
case .searchButtonPress:
guard !searchBarText.isEmpty else { return nil }
do {
let forecast = try provider.forecast(for: searchBarText)
return .success(city: searchBarText, forecast: forecast)
} catch {
return .failure(city: searchBarText)
}
}
return nil
}
}```swift
protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
private var searchBarText: String = ""
required 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:
guard !searchBarText.isEmpty else { return nil }
do {
let forecast = try provider.forecast(for: searchBarText)
return .success(city: searchBarText, forecast: forecast)
} catch {
return .failure(city: searchBarText)
}
}
return nil
}
}
// MARK: - Tests
let weatherProvider = MockWeatherProvider()
let weatherApplication = WeatherApplication(provider: weatherProvider)
let feedback = weatherApplication.handle(action: .keyboardCharacterSelect("S"))
print(feedback) // nil
let feedback2 = weatherApplication.handle(action: .keyboardCharacterSelect("a"))
print(feedback2) // nil
let feedback3 = weatherApplication.handle(action: .keyboardCharacterSelect("n"))
print(feedback3) // nil
let feedback4 = weatherApplication.handle(action: .keyboardCharacterSelect("c"))
print(feedback4) // nil
let feedback5 = weatherApplication.handle(action: .keyboardCharacterSelect("h"))
print(feedback5) // nil
let feedback6 = weatherApplication.handle(action: .keyboardCharacterSelect("e"))
print(feedback6) // nil
let feedback7 = weatherApplication.handle(action: .keyboardCharacterSelect(" "))
print(feedback7) // nil
let feedback8 = weatherApplication.handle(action: .keyboardCharacterSelect("B"))
print(feedback8) // nil
let feedback9 = weatherApplication.handle(action: .keyboardCharacterSelect("a"))
print(feedback9) // nil
let feedback10 = weatherApplication.handle(action: .keyboardCharacterSelect("r"))
print(feedback10) // nil
let feedback11 = weatherApplication.handle(action: .keyboardCharacterSelect("c"))
print(feedback11) // nil
let feedback12 = weatherApplication.handle(action: .keyboardCharacterSelect("k"))
print(feedback12) // nil
let feedback13 = weatherApplication.handle(action: .keyboardCharacterSelect("l"))
print(feedback13) // nil
let feedback14 = weatherApplication.handle(action: .keyboardCharacterSelect("a"))
print(feedback14) // nil
let feedback15 = weatherApplication.handle(action: .keyboardCharacterSelect("n"))
print(feedback15) // nil
let feedback16 = weatherApplication.handle(action: .keyboardCharacterSelect("d"))
print(feedback16) // nil
let feedback17 = weatherApplication.handle(action: .keyboardCharacterSelect("a"))
print(feedback17) // nil
let feedback18 = weatherApplication.handle(action: .keyboardCharacterSelect("n"))
print(feedback18) // nil
let feedback19 = weatherApplication.handle(action: .keyboardCharacterSelect("d"))
print(feedback19) // nil
let feedback20 = weatherApplication.handle(action: .keyboardCharacterSelect("a"))
print(feedback20) // nil
let feedback21 = weatherApplication.handle(action: .keyboardCharacterSelect("n"))
print(feedback21) // nil
let feedback22 = weatherApplication.handle(action: .keyboardCharacterSelect("d"))
print(feedback22) // nil
let feedback23 = weatherApplication.handle(action: .keyboardCharacterSelect("a"))
print(feedback23) // nil
let feedback24 = weatherApplication.handle(action: .keyboardCharacterSelect("n"))
print(feedback24) // nil
let feedback25 = weatherApplication.handle(action: .keyboardCharacterSelect("d"))
print(feedback25) // nil
let feedback26 = weatherApplication.handle(action: .keyboardCharacterSelect("a"))
print(feedback26) // nil
let feedback27 = weatherApplicationprotocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
private var searchBarText: String = ""
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchBarText.append(character)
case .keyboardDeleteBackwards:
searchBarText.removeLast()
case .searchButtonPress:
guard !searchBarText.isEmpty else { return nil }
do {
let forecast = try provider.forecast(for: searchBarText)
return .success(city: searchBarText, forecast: forecast)
} catch {
return .failure(city: searchBarText)
}
}
return nil
}
}
class WeatherProviderMock: WeatherProvider {
func forecast(for city: String) throws -> String {
switch city {
case "London":
return "It's sunny in London"
case "Paris":
return "It's rainy in Paris"
case "New York":
return "It's snowy in New York"
default:
throw NSError(domain: "WeatherProviderMock", code: 0, userInfo: [NSLocalizedDescriptionKey: "City not found"])
}
}
}```swift
protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
private var searchBarText: String = ""
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchBarText.append(character)
case .keyboardDeleteBackwards:
searchBarText.removeLast()
case .searchButtonPress:
guard !searchBarText.isEmpty else { return nil }
do {
let forecast = try provider.forecast(for: searchBarText)
return .success(city: searchBarText, forecast: forecast)
} catch {
return .failure(city: searchBarText)
}
}
return nil
}
}
// Weather provider.
// Return forecast for a given city.
class WeatherProviderMock: WeatherProvider {
func forecast(for city: String) throws -> String {
switch city {
case "London":
return "It's sunny in London"
case "Paris":
return "It's rainy in Paris"
case "New York":
return "It's snowy in New York"
default:
throw NSError(domain: "WeatherProviderMock", code: 0, userInfo: [NSLocalizedDescriptionKey: "City not found"])
}
}
}
// Weather application test.
// Test WeatherApplication with WeatherProviderMock.
class WeatherApplicationTests: XCTestCase {
func testWeatherApplication() {
let provider = WeatherProviderMock()
let application = WeatherApplication(provider: provider)
// Test search for London.
application.handle(action: .keyboardCharacterSelect("L"))
application.handle(action: .keyboardCharacterSelect("o"))
application.handle(action: .keyboardCharacterSelect("n"))
application.handle(action: .keyboardCharacterSelect("d"))
application.handle(action: .searchButtonPress)
XCTAssertEqual(application.handle(action: .searchButtonPress), .success(city: "London", forecast: "It's sunny in London"))
// Test search for Paris.
application.handle(action: .keyboardDeleteBackwards)
application.handle(action: .keyboardDeleteBackwards)
application.handle(action: .keyboardDeleteBackwards)
application.handle(action: .keyboardDeleteBackwards)
application.handle(action: .keyboardCharacterSelect("P"))
application.handle(action: .keyboardCharacterSelect("a"))
application.handle(action: .keyboardCharacterSelect("r"))
application.handle(action: .keyboardCharacterSelect("i"))
application.handle(action: .keyboardCharacterSelect("s"))
application.handle(action: .searchButtonPress)
XCTAssertEqual(application.handle(action: .searchButtonPress), .success(city: "Paris", forecast: "It's rainy in Paris"))
// Test search for New York.
application.handle(action: .keyboardDeleteBackwards)
application.handle(action: .keyboardDeleteBackwards)
application.handle(action: .keyboardDeleteBackwards)
application.handle(action: .keyboardDeleteBackwards)
application.handle(action: .keyboardCharacterSelect("N"))
application.handle(action: .keyboardCharacterSelect("e"))
application.handle(action: .keyboardCharacterSelect("w"))
application.handle(action: .keyboardCharacterSelect(" "))
application.handle(action: .keyboardCharacterSelect("Y"))
application.handle(action: .keyboardCharacterSelect("o"))
application.handle(action: .keyboardCharacterSelect("r"))
application.handle(action: .keyboardCharacterSelect("k"))
application.handle(action: .searchButtonPress)
XCTAssertEqual(application.handle(action: .searchButtonPress), .success(city: "New York", forecast: "It's snowy in New York"))
// Test search for city not found.
application.handle(action: .keyboardDeleteBackwardsprotocol 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 = ""
private var searchBarResults: [String] = []
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchBarText.append(character)
searchBarResults = ["London", "New York", "Paris", "Berlin"]
return nil
case .keyboardDeleteBackwards:
searchBarText = String(searchBarText.dropLast())
searchBarResults = ["London", "New York", "Paris", "Berlin"]
return nil
case .searchButtonPress:
guard !searchBarText.isEmpty else { return nil }
do {
let forecast = try provider.forecast(for: searchBarText)
return .success(city: searchBarText, forecast: forecast)
} catch {
return .failure(city: searchBarText)
}
}
}
}
class WeatherProviderImpl: WeatherProvider {
func forecast(for city: String) throws -> String {
switch city {
case "London":
return "It's going to be sunny today."
case "New York":
return "It's going to be cloudy today."
case "Paris":
return "It's going to be rainy today."
case "Berlin":
return "It's going to be snowy today."
default:
throw NSError(domain: "WeatherProvider", code: 0, userInfo: [NSLocalizedDescriptionKey: "City not found"])
}
}
}```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 = ""
private var searchBarResults: [String] = []
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchBarText.append(character)
searchBarResults = ["London", "New York", "Paris", "Berlin"]
return nil
case .keyboardDeleteBackwards:
searchBarText = String(searchBarText.dropLast())
searchBarResults = ["London", "New York", "Paris", "Berlin"]
return nil
case .searchButtonPress:
guard !searchBarText.isEmpty else { return nil }
do {
let forecast = try provider.forecast(for: searchBarText)
return .success(city: searchBarText, forecast: forecast)
} catch {
return .failure(city: searchBarText)
}
}
}
}
// Weather provider.
// Provide forecast for a given city.
class WeatherProviderImpl: WeatherProvider {
func forecast(for city: String) throws -> String {
switch city {
case "London":
return "It's going to be sunny today."
case "New York":
return "It's going to be cloudy today."
case "Paris":
return "It's going to be rainy today."
case "Berlin":
return "It's going to be snowy today."
default:
throw NSError(domain: "WeatherProvider", code: 0, userInfo: [NSLocalizedDescriptionKey: "City not found"])
}
}
}
// Weather application.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
let weatherProvider = WeatherProviderImpl()
let weatherApplication = WeatherApplication(provider: weatherProvider)
// User actions.
let userActions: [UserAction] = [
.keyboardCharacterSelect("L"),
.keyboardCharacterSelect("o"),
.keyboardCharacterSelect("n"),
.keyboardCharacterSelect("d"),
.keyboardCharacterSelect("o"),
.keyboardCharacterSelect("n"),
.searchButtonPress
]
// Handle user actions and print feedback.
for action in userActions {
if let feedback = weatherApplication.handle(action: action) {
switch feedback {
case .success(let city, let forecast):
print("Forecast for \(city): \(forecast)")
case .failure(let city):
print("Forecast for \(city) not found.")
}
}
}
```protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
private var searchBarText: String = ""
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchBarText.append(character)
return nil
case .keyboardDeleteBackwards:
searchBarText.removeLast()
return nil
case .searchButtonPress:
guard !searchBarText.isEmpty else { return nil }
do {
let forecast = try provider.forecast(for: searchBarText)
return .success(city: searchBarText, forecast: forecast)
} catch {
return .failure(city: searchBarText)
}
}
}
}
class MockWeatherProvider: WeatherProvider {
func forecast(for city: String) throws -> String {
if city == "Sarale Bing" {
return "It's sunny"
} else {
throw NSError(domain: "WeatherProvider", code: 0, userInfo: nil)
}
}
}```swift
protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
private var searchBarText: String = ""
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchBarText.append(character)
return nil
case .keyboardDeleteBackwards:
searchBarText.removeLast()
return nil
case .searchButtonPress:
guard !searchBarText.isEmpty else { return nil }
do {
let forecast = try provider.forecast(for: searchBarText)
return .success(city: searchBarText, forecast: forecast)
} catch {
return .failure(city: searchBarText)
}
}
}
}
// MARK: - Tests
let weatherProvider = MockWeatherProvider()
let weatherApplication = WeatherApplication(provider: weatherProvider)
weatherApplication.handle(action: .keyboardCharacterSelect("S"))
weatherApplication.handle(action: .keyboardCharacterSelect("a"))
weatherApplication.handle(action: .keyboardCharacterSelect("r"))
weatherApplication.handle(action: .keyboardCharacterSelect("a"))
weatherApplication.handle(action: .keyboardCharacterSelect("l"))
weatherApplication.handle(action: .keyboardCharacterSelect("e"))
weatherApplication.handle(action: .keyboardCharacterSelect(" "))
weatherApplication.handle(action: .keyboardCharacterSelect("B"))
weatherApplication.handle(action: .keyboardCharacterSelect("e"))
weatherApplication.handle(action: .keyboardCharacterSelect("r"))
weatherApplication.handle(action: .keyboardCharacterSelect("l"))
weatherApplication.handle(action: .keyboardCharacterSelect("i"))
weatherApplication.handle(action: .keyboardCharacterSelect("n"))
weatherApplication.handle(action: .keyboardCharacterSelect("g"))
weatherApplication.handle(action: .searchButtonPress)
// MARK: - Mocks
class MockWeatherProvider: WeatherProvider {
func forecast(for city: String) throws -> String {
if city == "Sarale Bing" {
return "It's sunny"
} else {
throw NSError(domain: "WeatherProvider", code: 0, userInfo: nil)
}
}
}
```protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
private var searchResults: [String] = []
private var currentCity: String?
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
if let currentCity = currentCity {
self.currentCity = currentCity + String(character)
} else {
self.currentCity = String(character)
}
searchResults = ["London", "New York", "Paris"]
case .keyboardDeleteBackwards:
if let currentCity = currentCity {
self.currentCity = String(currentCity.dropLast())
}
searchResults = ["London", "New York", "Paris"]
case .searchButtonPress:
guard let currentCity = currentCity else {
return nil
}
do {
let forecast = try provider.forecast(for: currentCity)
return .success(city: currentCity, forecast: forecast)
} catch {
return .failure(city: currentCity)
}
}
return nil
}
}
class MockWeatherProvider: WeatherProvider {
func forecast(for city: String) throws -> String {
switch city {
case "London":
return "It's gonna be sunny today"
case "New York":
return "It's gonna be rainy today"
case "Paris":
return "It's gonna be snowy today"
default:
throw NSError(domain: "MockWeatherProvider", code: 0, userInfo: nil)
}
}
}```swift
protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
// Weather application provider.
// Handle user actions to fill search bar results and use WeatherProvider to check forecast.
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
private var searchResults: [String] = []
private var currentCity: String?
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
if let currentCity = currentCity {
self.currentCity = currentCity + String(character)
} else {
self.currentCity = String(character)
}
searchResults = ["London", "New York", "Paris"]
case .keyboardDeleteBackwards:
if let currentCity = currentCity {
self.currentCity = String(currentCity.dropLast())
}
searchResults = ["London", "New York", "Paris"]
case .searchButtonPress:
guard let currentCity = currentCity else {
return nil
}
do {
let forecast = try provider.forecast(for: currentCity)
return .success(city: currentCity, forecast: forecast)
} catch {
return .failure(city: currentCity)
}
}
return nil
}
}
// MARK: - WeatherProvider
// Mock WeatherProvider
class MockWeatherProvider: WeatherProvider {
func forecast(for city: String) throws -> String {
switch city {
case "London":
return "It's gonna be sunny today"
case "New York":
return "It's gonna be rainy today"
case "Paris":
return "It's gonna be snowy today"
default:
throw NSError(domain: "MockWeatherProvider", code: 0, userInfo: nil)
}
}
}
// MARK: - Tests
let weatherProvider = MockWeatherProvider()
let weatherApplication = WeatherApplication(provider: weatherProvider)
let feedback = weatherApplication.handle(action: .keyboardCharacterSelect("L"))
print(feedback) // nil
let feedback2 = weatherApplication.handle(action: .keyboardCharacterSelect("o"))
print(feedback2) // nil
let feedback3 = weatherApplication.handle(action: .keyboardCharacterSelect("n"))
print(feedback3) // nil
let feedback4 = weatherApplication.handle(action: .keyboardCharacterSelect("d"))
print(feedback4) // nil
let feedback5 = weatherApplication.handle(action: .searchButtonPress)
print(feedback5) // success(city: "London", forecast: "It's gonna be sunny today")
let feedback6 = weatherApplication.handle(action: .keyboardDeleteBackwards)
print(feedback6) // nil
let feedback7 = weatherApplication.handle(action: .keyboardDeleteBackwards)
print(feedback7) // nil
let feedback8 = weatherApplication.handle(action: .keyboardDeleteBackwards)
print(feedback8) // nil
let feedback9 = weatherApplication.handle(action: .keyboardDeleteBackwards)
print(feedback9) // nil
let feedback10 = weatherApplication.handle(action: .searchButtonPress)
print(feedback10) // failure(city: "")
let feedback11 = weatherApplication.handle(action: .keyboardCharacterSelect("N"))
print(feedback11) // nil
let feedback12 = weatherApplication.handle(action: .keyboardCharacterSelect("e"))
print(feedback12) // nil
let feedback13 = weatherApplication.handle(action: .keyboardCharacterSelect("w"))
print(feedback13) // nil
let feedback14 = weatherApplication.handle(action: .keyboardCharacterSelect("y"))
print(feedback14) // nil
let feedback15 = weatherApplication.handle(action: .searchButtonPress)
print(feedback15) // success(city: "New York", forecast: "It's gonna be rainy today")
let feedback16 = weatherApplication.handle(action: .keyboardDeleteBackwards)
print(feedback16) // nil
let feedback17 = weatherApplication.handle(action: .keyboardDeleteBackwards)
print(feedback17) // nil
let feedback18 = weatherApplication.handle(action: .keyboardDeleteBackwards)protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
private var searchBarText: String = ""
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchBarText.append(character)
return nil
case .keyboardDeleteBackwards:
searchBarText.removeLast()
return nil
case .searchButtonPress:
guard !searchBarText.isEmpty else { return nil }
do {
let forecast = try provider.forecast(for: searchBarText)
return .success(city: searchBarText, forecast: forecast)
} catch {
return .failure(city: searchBarText)
}
}
}
}
class MockWeatherProvider: WeatherProvider {
func forecast(for city: String) throws -> String {
if city == "New York" {
return "It's sunny in New York"
} else {
throw NSError(domain: "MockWeatherProvider", code: 0, userInfo: nil)
}
}
}
class MockWeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
private var searchBarText: String = ""
private var feedback: ApplicationFeedback?
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
feedback = WeatherApplication(provider: provider).handle(action: action)
return feedback
}
func getFeedback() -> ApplicationFeedback? {
return 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
private var searchBarText: String = ""
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchBarText.append(character)
return nil
case .keyboardDeleteBackwards:
searchBarText.removeLast()
return nil
case .searchButtonPress:
guard !searchBarText.isEmpty else { return nil }
do {
let forecast = try provider.forecast(for: searchBarText)
return .success(city: searchBarText, forecast: forecast)
} catch {
return .failure(city: searchBarText)
}
}
}
}
// MARK: - Tests
// Mock WeatherProvider
class MockWeatherProvider: WeatherProvider {
func forecast(for city: String) throws -> String {
if city == "New York" {
return "It's sunny in New York"
} else {
throw NSError(domain: "MockWeatherProvider", code: 0, userInfo: nil)
}
}
}
// Mock WeatherApplication
class MockWeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
private var searchBarText: String = ""
private var feedback: ApplicationFeedback?
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
feedback = WeatherApplication(provider: provider).handle(action: action)
return feedback
}
func getFeedback() -> ApplicationFeedback? {
return feedback
}
}
// Test cases
let mockProvider = MockWeatherProvider()
let mockApplication = MockWeatherApplication(provider: mockProvider)
// Test 1: Search for "New York"
mockApplication.handle(action: .keyboardCharacterSelect("N"))
mockApplication.handle(action: .keyboardCharacterSelect("e"))
mockApplication.handle(action: .keyboardCharacterSelect("w"))
mockApplication.handle(action: .keyboardCharacterSelect(" "))
mockApplication.handle(action: .keyboardCharacterSelect("Y"))
mockApplication.handle(action: .keyboardCharacterSelect("o"))
mockApplication.handle(action: .keyboardCharacterSelect("r"))
mockApplication.handle(action: .keyboardCharacterSelect("k"))
mockApplication.handle(action: .searchButtonPress)
if let feedback = mockApplication.getFeedback() {
switch feedback {
case .success(let city, let forecast):
print("Success: \(city) - \(forecast)")
case .failure(let city):
print("Failure: \(city)")
}
}
// Test 2: Search for "London"
mockApplication.handle(action: .keyboardCharacterSelect("L"))
mockApplication.handle(action: .keyboardCharacterSelect("o"))
mockApplication.handle(action: .keyboardCharacterSelect("n"))
mockApplication.handle(action: .keyboardCharacterSelect("d"))
mockApplication.handle(action: .searchButtonPress)
if let feedback = mockApplication.getFeedback() {
switch feedback {
case .success(let city, let forecast):
print("Success: \(city) - \(forecast)")
case .failure(let city):
print("Failure: \(city)")
}
}
```protocol WeatherProvider {
func forecast(for city: String) throws -> String
}
enum UserAction {
case keyboardCharacterSelect(Character)
case keyboardDeleteBackwards
case searchButtonPress
}
enum ApplicationFeedback: Equatable {
case success(city: String, forecast: String)
case failure(city: String)
}
protocol WeatherApplicationDependencies {
init(provider: WeatherProvider)
}
protocol WeatherApplicationInteractions {
func handle(action: UserAction) -> ApplicationFeedback?
}
typealias WeatherApplicationProtocol = WeatherApplicationDependencies & WeatherApplicationInteractions
class WeatherApplication: WeatherApplicationProtocol {
private let provider: WeatherProvider
private var searchBar: String = ""
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchBar.append(character)
case .keyboardDeleteBackwards:
searchBar.removeLast()
case .searchButtonPress:
guard let forecast = try? provider.forecast(for: searchBar) else {
return .failure(city: searchBar)
}
return .success(city: searchBar, forecast: forecast)
}
return nil
}
}
class WeatherProviderMock: WeatherProvider {
func forecast(for city: String) throws -> String {
switch city {
case "London":
return "It's going to rain"
case "New York":
return "It's going to snow"
case "Paris":
return "It's going to sun"
default:
throw NSError(domain: "WeatherProviderMock", code: 0, userInfo: [NSLocalizedDescriptionKey: "City not found"])
}
}
}
class WeatherApplicationMock: WeatherApplicationProtocol {
private let provider: WeatherProvider
private var searchBar: String = ""
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchBar.append(character)
case .keyboardDeleteBackwards:
searchBar.removeLast()
case .searchButtonPress:
guard let forecast = try? provider.forecast(for: searchBar) else {
return .failure(city: searchBar)
}
return .success(city: searchBar, forecast: forecast)
}
return nil
}
}
class WeatherApplicationTests: XCTestCase {
func testWeatherApplication() {
let provider = WeatherProviderMock()
let application = WeatherApplication(provider: provider)
XCTAssertEqual(application.handle(action: .keyboardCharacterSelect("L")), nil)
XCTAssertEqual(application.handle(action: .keyboardCharacterSelect("o")), nil)
XCTAssertEqual(application.handle(action: .keyboardCharacterSelect("n")), nil)
XCTAssertEqual(application.handle(action: .keyboardCharacterSelect("d")), nil)
XCTAssertEqual(application.handle(action: .keyboardCharacterSelect("o")), nil)
XCTAssertEqual(application.handle(action: .keyboardCharacterSelect("n")), nil)
XCTAssertEqual(application.handle(action: .searchButtonPress), .success(city: "London", forecast: "It's going to rain"))
}
}```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 searchBar: String = ""
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchBar.append(character)
case .keyboardDeleteBackwards:
searchBar.removeLast()
case .searchButtonPress:
guard let forecast = try? provider.forecast(for: searchBar) else {
return .failure(city: searchBar)
}
return .success(city: searchBar, forecast: forecast)
}
return nil
}
}
// Weather provider.
// Mocked provider to simulate a real API call.
class WeatherProviderMock: WeatherProvider {
func forecast(for city: String) throws -> String {
switch city {
case "London":
return "It's going to rain"
case "New York":
return "It's going to snow"
case "Paris":
return "It's going to sun"
default:
throw NSError(domain: "WeatherProviderMock", code: 0, userInfo: [NSLocalizedDescriptionKey: "City not found"])
}
}
}
// Weather application.
// Mocked application to simulate a real application.
class WeatherApplicationMock: WeatherApplicationProtocol {
private let provider: WeatherProvider
private var searchBar: String = ""
required init(provider: WeatherProvider) {
self.provider = provider
}
func handle(action: UserAction) -> ApplicationFeedback? {
switch action {
case .keyboardCharacterSelect(let character):
searchBar.append(character)
case .keyboardDeleteBackwards:
searchBar.removeLast()
case .searchButtonPress:
guard let forecast = try? provider.forecast(for: searchBar) else {
return .failure(city: searchBar)
}
return .success(city: searchBar, forecast: forecast)
}
return nil
}
}
// Weather application tests.
// Test the application with the mocked provider.
class WeatherApplicationTests: XCTestCase {
func testWeatherApplication() {
let provider = WeatherProviderMock()
let application = WeatherApplication(provider: provider)
XCTAssertEqual(application.handle(action: .keyboardCharacterSelect("L")), nil)
XCTAssertEqual(application.handle(action: .keyboardCharacterSelect("o")), nil)
XCTAssertEqual(application.handle(action: .keyboardCharacterSelect("n")), nil)
XCTAssertEqual(application.handle(action: .keyboardCharacterSelect("d")), nil)
XCTAssertEqual(application.handle(action: .keyboardCharacterSelect("o")), nil)
XCTAssertEqual(application.handle(action: .keyboardCharacterSelect("n")), nil)
XCTAssertEqual(application.handle(action: .searchButtonPress), .success(city: "London", forecast: "It's going to rain"))
}
}
WeatherApplicationTests.defaultTestSuite.run()
```protocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
actor BankAccount: BankAccountProtocol {
private var balance: Double
required init(balance: Double) {
self.balance = balance
}
var balance: Double {
get async {
return self.balance
}
}
func deposit(amount: Double) async {
self.balance += amount
}
func withdraw(amount: Double) async -> Bool {
if self.balance >= amount {
self.balance -= amount
return true
} else {
return false
}
}
}```swift
protocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
// Thread-safe bank account class using an actor that allows asynchronous deposits and withdrawals, ensuring that the account balance remains consistent and transactions are atomic.
actor BankAccount: BankAccountProtocol {
private var balance: Double
required init(balance: Double) {
self.balance = balance
}
var balance: Double {
get async {
return self.balance
}
}
func deposit(amount: Double) async {
self.balance += amount
}
func withdraw(amount: Double) async -> Bool {
if self.balance >= amount {
self.balance -= amount
return true
} else {
return false
}
}
}
// Example usage:
Task {
let account = BankAccount(balance: 1000.0)
await account.deposit(amount: 500.0)
let success = await account.withdraw(amount: 200.0)
print("Withdrawal successful: \(success)")
print("Current balance: \(await account.balance)")
}
```private var balance: Double // property 'balance' must be declared internal because it matches a requirement in internal protocol 'BankAccountProtocol'required init(balance: Double) { // 'required' initializer in non-class type 'BankAccount'var balance: Double { // invalid redeclaration of 'balance'protocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
actor BankAccount: BankAccountProtocol {
private var balance: Double
required init(balance: Double) {
self.balance = balance
}
var balance: Double {
get async {
return self.balance
}
}
func deposit(amount: Double) async {
self.balance += amount
}
func withdraw(amount: Double) async -> Bool {
if self.balance >= amount {
self.balance -= amount
return true
} else {
return false
}
}
}```swift
protocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
// Thread-safe bank account class using an actor that allows asynchronous deposits and withdrawals, ensuring that the account balance remains consistent and transactions are atomic.
actor BankAccount: BankAccountProtocol {
private var balance: Double
required init(balance: Double) {
self.balance = balance
}
var balance: Double {
get async {
return self.balance
}
}
func deposit(amount: Double) async {
self.balance += amount
}
func withdraw(amount: Double) async -> Bool {
if self.balance >= amount {
self.balance -= amount
return true
} else {
return false
}
}
}
// Example usage:
Task {
let account = BankAccount(balance: 1000.0)
await account.deposit(amount: 500.0)
let success = await account.withdraw(amount: 200.0)
print("Withdrawal successful: \(success)")
print("Current balance: \(await account.balance)")
}
```private var balance: Double // property 'balance' must be declared internal because it matches a requirement in internal protocol 'BankAccountProtocol'required init(balance: Double) { // 'required' initializer in non-class type 'BankAccount'var balance: Double { // invalid redeclaration of 'balance'protocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
actor BankAccount: BankAccountProtocol {
private var _balance: Double
required init(balance: Double) {
self._balance = balance
}
var balance: Double {
get async {
return await self._balance
}
}
func deposit(amount: Double) async {
await self._balance.add(amount)
}
func withdraw(amount: Double) async -> Bool {
if await self._balance >= amount {
await self._balance.subtract(amount)
return true
} else {
return false
}
}
}```swift
protocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
// Thread-safe bank account class using an actor that allows asynchronous deposits and withdrawals, ensuring that the account balance remains consistent and transactions are atomic.
actor BankAccount: BankAccountProtocol {
private var _balance: Double
required init(balance: Double) {
self._balance = balance
}
var balance: Double {
get async {
return await self._balance
}
}
func deposit(amount: Double) async {
await self._balance.add(amount)
}
func withdraw(amount: Double) async -> Bool {
if await self._balance >= amount {
await self._balance.subtract(amount)
return true
} else {
return false
}
}
}
// Example usage:
Task {
let account = BankAccount(balance: 100.0)
await account.deposit(amount: 50.0)
let success = await account.withdraw(amount: 20.0)
print("Withdrawal successful: \(success)")
print("Current balance: \(await account.balance)")
}
```required init(balance: Double) { // 'required' initializer in non-class type 'BankAccount'return await self._balance // no 'async' operations occur within 'await' expressionawait self._balance.add(amount) // value of type 'Double' has no member 'add'if await self._balance >= amount { // no 'async' operations occur within 'await' expressionawait self._balance.subtract(amount) // value of type 'Double' has no member 'subtract'protocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
actor BankAccount: BankAccountProtocol {
private var _balance: Double
required init(balance: Double) {
self._balance = balance
}
var balance: Double {
get async {
return await self._balance
}
}
func deposit(amount: Double) async {
await self._balance.add(amount)
}
func withdraw(amount: Double) async -> Bool {
if await self._balance >= amount {
await self._balance.subtract(amount)
return true
} else {
return false
}
}
}
extension Double {
mutating func add(_ value: Double) {
self = self + value
}
mutating func subtract(_ value: Double) {
self = self - value
}
}
func main() async {
let account = BankAccount(balance: 100.0)
// Deposit 50.0 into the account
await account.deposit(amount: 50.0)
print("Deposited 50.0, new balance: \(await account.balance)")
// Withdraw 30.0 from the account
let success = await account.withdraw(amount: 30.0)
if success {
print("Withdrew 30.0, new balance: \(await account.balance)")
} else {
print("Insufficient funds for withdrawal")
}
}```swift
protocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
// Thread-safe bank account class using an actor that allows asynchronous deposits and withdrawals, ensuring that the account balance remains consistent and transactions are atomic.
actor BankAccount: BankAccountProtocol {
private var _balance: Double
required init(balance: Double) {
self._balance = balance
}
var balance: Double {
get async {
return await self._balance
}
}
func deposit(amount: Double) async {
await self._balance.add(amount)
}
func withdraw(amount: Double) async -> Bool {
if await self._balance >= amount {
await self._balance.subtract(amount)
return true
} else {
return false
}
}
}
// Extension to add atomic operations to Double
extension Double {
mutating func add(_ value: Double) {
self = self + value
}
mutating func subtract(_ value: Double) {
self = self - value
}
}
// Main function to test the BankAccount class
func main() async {
let account = BankAccount(balance: 100.0)
// Deposit 50.0 into the account
await account.deposit(amount: 50.0)
print("Deposited 50.0, new balance: \(await account.balance)")
// Withdraw 30.0 from the account
let success = await account.withdraw(amount: 30.0)
if success {
print("Withdrew 30.0, new balance: \(await account.balance)")
} else {
print("Insufficient funds for withdrawal")
}
}
// Run the main function
Task {
await main()
}
```required init(balance: Double) { // 'required' initializer in non-class type 'BankAccount'return await self._balance // no 'async' operations occur within 'await' expressionawait self._balance.add(amount) // no 'async' operations occur within 'await' expressionif await self._balance >= amount { // no 'async' operations occur within 'await' expressionawait self._balance.subtract(amount) // no 'async' operations occur within 'await' expressionprotocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
actor BankAccount: BankAccountProtocol {
private var _balance: Double
required init(balance: Double) {
self._balance = balance
}
var balance: Double {
get async {
return await self._balance
}
}
func deposit(amount: Double) async {
await self._balance.add(amount)
}
func withdraw(amount: Double) async -> Bool {
if await self._balance.subtract(amount) {
return true
} else {
return false
}
}
}
extension Double {
mutating func add(_ value: Double) -> Bool {
let oldValue = self
self = self + value
return oldValue == self
}
mutating func subtract(_ value: Double) -> Bool {
let oldValue = self
self = self - value
return oldValue == self
}
}```swift
protocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
// Thread-safe bank account class using an actor that allows asynchronous deposits and withdrawals, ensuring that the account balance remains consistent and transactions are atomic.
actor BankAccount: BankAccountProtocol {
private var _balance: Double
required init(balance: Double) {
self._balance = balance
}
var balance: Double {
get async {
return await self._balance
}
}
func deposit(amount: Double) async {
await self._balance.add(amount)
}
func withdraw(amount: Double) async -> Bool {
if await self._balance.subtract(amount) {
return true
} else {
return false
}
}
}
// Extension to add atomic operations to Double
extension Double {
mutating func add(_ value: Double) -> Bool {
let oldValue = self
self = self + value
return oldValue == self
}
mutating func subtract(_ value: Double) -> Bool {
let oldValue = self
self = self - value
return oldValue == self
}
}
// Example usage:
Task {
let account = BankAccount(balance: 1000.0)
// Deposit 500.0
await account.deposit(amount: 500.0)
print("Balance after deposit: \(await account.balance)")
// Withdraw 200.0
if await account.withdraw(amount: 200.0) {
print("Withdrawal successful. Balance: \(await account.balance)")
} else {
print("Insufficient funds for withdrawal.")
}
}
```required init(balance: Double) { // 'required' initializer in non-class type 'BankAccount'return await self._balance // no 'async' operations occur within 'await' expressionawait self._balance.add(amount) // result of call to 'add' is unusedawait self._balance.add(amount) // no 'async' operations occur within 'await' expressionif await self._balance.subtract(amount) { // no 'async' operations occur within 'await' expressionprotocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
actor BankAccount: BankAccountProtocol {
private var _balance: Double
required init(balance: Double) {
self._balance = balance
}
var balance: Double {
get async {
return await self._balance
}
}
func deposit(amount: Double) async {
await self._balance.add(amount)
}
func withdraw(amount: Double) async -> Bool {
if await self._balance >= amount {
await self._balance.subtract(amount)
return true
} else {
return false
}
}
}
extension Double {
mutating func add(_ value: Double) {
self = self + value
}
mutating func subtract(_ value: Double) {
self = self - value
}
}
func main() async {
let account = BankAccount(balance: 100.0)
// Deposit 50.0
await account.deposit(amount: 50.0)
print("Deposit successful. New balance: \(await account.balance)")
// Withdraw 30.0
if await account.withdraw(amount: 30.0) {
print("Withdrawal successful. New balance: \(await account.balance)")
} else {
print("Insufficient funds for withdrawal.")
}
}```swift
protocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
// Thread-safe bank account class using an actor that allows asynchronous deposits and withdrawals, ensuring that the account balance remains consistent and transactions are atomic.
actor BankAccount: BankAccountProtocol {
private var _balance: Double
required init(balance: Double) {
self._balance = balance
}
var balance: Double {
get async {
return await self._balance
}
}
func deposit(amount: Double) async {
await self._balance.add(amount)
}
func withdraw(amount: Double) async -> Bool {
if await self._balance >= amount {
await self._balance.subtract(amount)
return true
} else {
return false
}
}
}
// Extension to provide atomic operations on Double
extension Double {
mutating func add(_ value: Double) {
self = self + value
}
mutating func subtract(_ value: Double) {
self = self - value
}
}
// Main function to test the BankAccount class
func main() async {
let account = BankAccount(balance: 100.0)
// Deposit 50.0
await account.deposit(amount: 50.0)
print("Deposit successful. New balance: \(await account.balance)")
// Withdraw 30.0
if await account.withdraw(amount: 30.0) {
print("Withdrawal successful. New balance: \(await account.balance)")
} else {
print("Insufficient funds for withdrawal.")
}
}
// Run the main function
Task {
await main()
}
```required init(balance: Double) { // 'required' initializer in non-class type 'BankAccount'return await self._balance // no 'async' operations occur within 'await' expressionawait self._balance.add(amount) // no 'async' operations occur within 'await' expressionif await self._balance >= amount { // no 'async' operations occur within 'await' expressionawait self._balance.subtract(amount) // no 'async' operations occur within 'await' expressionprotocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
actor BankAccount: BankAccountProtocol {
private var balance: Double
required init(balance: Double) {
self.balance = balance
}
var balance: Double {
get async {
return self.balance
}
}
func deposit(amount: Double) async {
await withCheckedContinuation { continuation in
Task {
self.balance += amount
continuation.resume()
}
}
}
func withdraw(amount: Double) async -> Bool {
await withCheckedContinuation { continuation in
Task {
if self.balance >= amount {
self.balance -= amount
continuation.resume(returning: true)
} else {
continuation.resume(returning: false)
}
}
}
}
}```swift
protocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
// Thread-safe bank account class using an actor that allows asynchronous deposits and withdrawals, ensuring that the account balance remains consistent and transactions are atomic.
actor BankAccount: BankAccountProtocol {
private var balance: Double
required init(balance: Double) {
self.balance = balance
}
var balance: Double {
get async {
return self.balance
}
}
func deposit(amount: Double) async {
await withCheckedContinuation { continuation in
Task {
self.balance += amount
continuation.resume()
}
}
}
func withdraw(amount: Double) async -> Bool {
await withCheckedContinuation { continuation in
Task {
if self.balance >= amount {
self.balance -= amount
continuation.resume(returning: true)
} else {
continuation.resume(returning: false)
}
}
}
}
}
// Example usage:
Task {
let account = BankAccount(balance: 100.0)
await account.deposit(amount: 50.0)
let success = await account.withdraw(amount: 30.0)
print("Withdrawal successful: \(success)")
print("Current balance: \(await account.balance)")
}
```private var balance: Double // property 'balance' must be declared internal because it matches a requirement in internal protocol 'BankAccountProtocol'required init(balance: Double) { // 'required' initializer in non-class type 'BankAccount'var balance: Double { // invalid redeclaration of 'balance'protocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
actor BankAccount: BankAccountProtocol {
private var _balance: Double
required init(balance: Double) {
self._balance = balance
}
var balance: Double {
get async {
return _balance
}
}
func deposit(amount: Double) async {
_balance += amount
}
func withdraw(amount: Double) async -> Bool {
if _balance >= amount {
_balance -= amount
return true
} else {
return false
}
}
}
func main() async {
let account = BankAccount(balance: 1000.0)
// Asynchronous deposit
await account.deposit(amount: 500.0)
print("Deposit successful. New balance: \(await account.balance)")
// Asynchronous withdrawal
let withdrawalSuccess = await account.withdraw(amount: 200.0)
if withdrawalSuccess {
print("Withdrawal successful. New balance: \(await account.balance)")
} else {
print("Insufficient funds for withdrawal.")
}
}```swift
protocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
// Thread-safe bank account class using an actor that allows asynchronous deposits and withdrawals, ensuring that the account balance remains consistent and transactions are atomic.
actor BankAccount: BankAccountProtocol {
private var _balance: Double
required init(balance: Double) {
self._balance = balance
}
var balance: Double {
get async {
return _balance
}
}
func deposit(amount: Double) async {
_balance += amount
}
func withdraw(amount: Double) async -> Bool {
if _balance >= amount {
_balance -= amount
return true
} else {
return false
}
}
}
// Main function to test the BankAccount class
func main() async {
let account = BankAccount(balance: 1000.0)
// Asynchronous deposit
await account.deposit(amount: 500.0)
print("Deposit successful. New balance: \(await account.balance)")
// Asynchronous withdrawal
let withdrawalSuccess = await account.withdraw(amount: 200.0)
if withdrawalSuccess {
print("Withdrawal successful. New balance: \(await account.balance)")
} else {
print("Insufficient funds for withdrawal.")
}
}
// Run the main function
Task {
await main()
}
```required init(balance: Double) { // 'required' initializer in non-class type 'BankAccount'protocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
actor BankAccount: BankAccountProtocol {
private var _balance: Double
required init(balance: Double) {
self._balance = balance
}
var balance: Double {
get async {
return await self._balance
}
}
func deposit(amount: Double) async {
await self._balance.add(amount)
}
func withdraw(amount: Double) async -> Bool {
if await self._balance >= amount {
await self._balance.subtract(amount)
return true
} else {
return false
}
}
}
extension Double {
mutating func add(_ value: Double) {
self = self + value
}
mutating func subtract(_ value: Double) {
self = self - value
}
}```swift
protocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
// Thread-safe bank account class using an actor that allows asynchronous deposits and withdrawals, ensuring that the account balance remains consistent and transactions are atomic.
actor BankAccount: BankAccountProtocol {
private var _balance: Double
required init(balance: Double) {
self._balance = balance
}
var balance: Double {
get async {
return await self._balance
}
}
func deposit(amount: Double) async {
await self._balance.add(amount)
}
func withdraw(amount: Double) async -> Bool {
if await self._balance >= amount {
await self._balance.subtract(amount)
return true
} else {
return false
}
}
}
// Extension to add atomic operations to Double
extension Double {
mutating func add(_ value: Double) {
self = self + value
}
mutating func subtract(_ value: Double) {
self = self - value
}
}
// Example usage:
Task {
let account = BankAccount(balance: 100.0)
await account.deposit(amount: 50.0)
print("Balance after deposit: \(await account.balance)")
let success = await account.withdraw(amount: 75.0)
print("Withdrawal successful: \(success)")
print("Balance after withdrawal: \(await account.balance)")
}
```required init(balance: Double) { // 'required' initializer in non-class type 'BankAccount'return await self._balance // no 'async' operations occur within 'await' expressionawait self._balance.add(amount) // no 'async' operations occur within 'await' expressionif await self._balance >= amount { // no 'async' operations occur within 'await' expressionawait self._balance.subtract(amount) // no 'async' operations occur within 'await' expressionprotocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
actor BankAccount: BankAccountProtocol {
private var _balance: Double
required init(balance: Double) {
self._balance = balance
}
var balance: Double {
get async {
return await self._balance
}
}
func deposit(amount: Double) async {
await self._balance.add(amount)
}
func withdraw(amount: Double) async -> Bool {
if await self._balance >= amount {
await self._balance.subtract(amount)
return true
} else {
return false
}
}
}
extension Double {
mutating func add(_ value: Double) {
self = self + value
}
mutating func subtract(_ value: Double) {
self = self - value
}
}```swift
protocol BankAccountProtocol {
init(balance: Double)
var balance: Double { get async }
func deposit(amount: Double) async
func withdraw(amount: Double) async -> Bool
}
// Thread-safe bank account class using an actor that allows asynchronous deposits and withdrawals, ensuring that the account balance remains consistent and transactions are atomic.
actor BankAccount: BankAccountProtocol {
private var _balance: Double
required init(balance: Double) {
self._balance = balance
}
var balance: Double {
get async {
return await self._balance
}
}
func deposit(amount: Double) async {
await self._balance.add(amount)
}
func withdraw(amount: Double) async -> Bool {
if await self._balance >= amount {
await self._balance.subtract(amount)
return true
} else {
return false
}
}
}
// Extension to add atomic operations to Double
extension Double {
mutating func add(_ value: Double) {
self = self + value
}
mutating func subtract(_ value: Double) {
self = self - value
}
}
// Example usage:
Task {
let account = BankAccount(balance: 1000.0)
// Deposit $500
await account.deposit(amount: 500.0)
print("Deposited $500. New balance: \(await account.balance)")
// Withdraw $200
if await account.withdraw(amount: 200.0) {
print("Withdrew $200. New balance: \(await account.balance)")
} else {
print("Insufficient funds.")
}
}
```required init(balance: Double) { // 'required' initializer in non-class type 'BankAccount'return await self._balance // no 'async' operations occur within 'await' expressionawait self._balance.add(amount) // no 'async' operations occur within 'await' expressionif await self._balance >= amount { // no 'async' operations occur within 'await' expressionawait self._balance.subtract(amount) // no 'async' operations occur within 'await' expressionprotocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var value: Value?
private let condition: () -> Bool
private let compute: () -> Value
var wrappedValue: Value {
mutating get {
if condition() {
value = compute()
}
return value!
}
}
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.compute = wrappedValue
self.condition = condition
}
}
struct Person {
@Cached(condition: { self.age > 18 })
var isAdult: Bool {
age > 18
}
var age: Int
}```swift
protocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var value: Value?
private let condition: () -> Bool
private let compute: () -> Value
var wrappedValue: Value {
mutating get {
if condition() {
value = compute()
}
return value!
}
}
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.compute = wrappedValue
self.condition = condition
}
}
// Example usage:
struct Person {
@Cached(condition: { self.age > 18 })
var isAdult: Bool {
age > 18
}
var age: Int
}
var person = Person(age: 20)
print(person.isAdult) // Output: true
person.age = 15
print(person.isAdult) // Output: false
```@Cached(condition: { self.age > 18 }) // cannot find 'self' in scope; did you mean to use it in a type or extension context?@Cached(condition: { self.age > 18 }) // variable with getter/setter cannot have an initial value@Cached(condition: { self.age > 18 }) // property wrapper cannot be applied to a computed property@Cached(condition: { self.age > 18 }) // missing argument for parameter 'wrappedValue' in callprotocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var value: Value?
private let condition: () -> Bool
private let compute: () -> Value
var wrappedValue: Value {
mutating get {
if condition() {
value = compute()
}
return value!
}
set {
value = newValue
}
}
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.compute = wrappedValue
self.condition = condition
}
}
struct DataModel {
@Cached(wrappedValue: { expensiveComputation() }, condition: { someCondition() })
var cachedData: [Int]
func someCondition() -> Bool {
// Determine whether the cached data should be recomputed
return true
}
func expensiveComputation() -> [Int] {
// Perform an expensive computation to generate the data
return [1, 2, 3]
}
}```swift
protocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var value: Value?
private let condition: () -> Bool
private let compute: () -> Value
var wrappedValue: Value {
mutating get {
if condition() {
value = compute()
}
return value!
}
set {
value = newValue
}
}
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.compute = wrappedValue
self.condition = condition
}
}
// Example usage:
struct DataModel {
@Cached(wrappedValue: { expensiveComputation() }, condition: { someCondition() })
var cachedData: [Int]
func someCondition() -> Bool {
// Determine whether the cached data should be recomputed
return true
}
func expensiveComputation() -> [Int] {
// Perform an expensive computation to generate the data
return [1, 2, 3]
}
}
// Example of using the cached property:
let model = DataModel()
print(model.cachedData) // This will trigger the computation and cache the result
print(model.cachedData) // This will return the cached result without recomputing
```@Cached(wrappedValue: { expensiveComputation() }, condition: { someCondition() }) // cannot use instance member 'someCondition' within property initializer; property initializers run before 'self' is available@Cached(wrappedValue: { expensiveComputation() }, condition: { someCondition() }) // cannot use instance member 'expensiveComputation' within property initializer; property initializers run before 'self' is available@Cached(wrappedValue: { expensiveComputation() }, condition: { someCondition() }) // add () to forward @autoclosure parameterprotocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var value: Value?
private let condition: () -> Bool
private let compute: () -> Value
var wrappedValue: Value {
mutating get {
if condition() {
value = compute()
}
return value!
}
}
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.compute = wrappedValue
self.condition = condition
}
}
struct User {
@Cached(wrappedValue: { Date() }, condition: { true })
var currentTime: Date
@Cached(wrappedValue: { "Hello, World!" }, condition: { true })
var greeting: String
}```swift
protocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var value: Value?
private let condition: () -> Bool
private let compute: () -> Value
var wrappedValue: Value {
mutating get {
if condition() {
value = compute()
}
return value!
}
}
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.compute = wrappedValue
self.condition = condition
}
}
// Example usage:
struct User {
@Cached(wrappedValue: { Date() }, condition: { true })
var currentTime: Date
@Cached(wrappedValue: { "Hello, World!" }, condition: { true })
var greeting: String
}
let user = User()
print(user.currentTime) // This will print the current time
print(user.greeting) // This will print "Hello, World!"
```@Cached(wrappedValue: { Date() }, condition: { true }) // add () to forward @autoclosure parameter@Cached(wrappedValue: { "Hello, World!" }, condition: { true }) // add () to forward @autoclosure parameterprotocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var value: Value?
private var condition: () -> Bool
private var compute: () -> Value
var wrappedValue: Value {
mutating get {
if condition() {
value = compute()
}
return value!
}
set {
value = newValue
}
}
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.compute = wrappedValue
self.condition = condition
}
}
struct Person {
@Cached(condition: { self.age > 18 })
var isAdult: Bool {
age > 18
}
var age: Int
}```swift
protocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var value: Value?
private var condition: () -> Bool
private var compute: () -> Value
var wrappedValue: Value {
mutating get {
if condition() {
value = compute()
}
return value!
}
set {
value = newValue
}
}
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.compute = wrappedValue
self.condition = condition
}
}
// Example usage:
struct Person {
@Cached(condition: { self.age > 18 })
var isAdult: Bool {
age > 18
}
var age: Int
}
var person = Person(age: 20)
print(person.isAdult) // Output: true
person.age = 15
print(person.isAdult) // Output: false
```@Cached(condition: { self.age > 18 }) // missing argument for parameter 'wrappedValue' in call@Cached(condition: { self.age > 18 }) // cannot find 'self' in scope; did you mean to use it in a type or extension context?@Cached(condition: { self.age > 18 }) // variable with getter/setter cannot have an initial value@Cached(condition: { self.age > 18 }) // property wrapper cannot be applied to a computed propertyprotocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var value: Value?
private var condition: () -> Bool
private var compute: () -> Value
var wrappedValue: Value {
mutating get {
if condition() {
value = nil
}
if value == nil {
value = compute()
}
return value!
}
set {
value = newValue
}
}
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.compute = wrappedValue
self.condition = condition
}
}
struct Person {
@Cached(wrappedValue: { Date().timeIntervalSince1970 }, condition: { true })
var currentTime: TimeInterval
@Cached(wrappedValue: { "Hello, World!" }, condition: { true })
var greeting: String
}```swift
protocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var value: Value?
private var condition: () -> Bool
private var compute: () -> Value
var wrappedValue: Value {
mutating get {
if condition() {
value = nil
}
if value == nil {
value = compute()
}
return value!
}
set {
value = newValue
}
}
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.compute = wrappedValue
self.condition = condition
}
}
// Example usage:
struct Person {
@Cached(wrappedValue: { Date().timeIntervalSince1970 }, condition: { true })
var currentTime: TimeInterval
@Cached(wrappedValue: { "Hello, World!" }, condition: { true })
var greeting: String
}
let person = Person()
print(person.currentTime) // The current time will be cached and printed
print(person.greeting) // The greeting will be cached and printed
```@Cached(wrappedValue: { Date().timeIntervalSince1970 }, condition: { true }) // add () to forward @autoclosure parameter@Cached(wrappedValue: { "Hello, World!" }, condition: { true }) // add () to forward @autoclosure parameterprotocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var value: Value?
private var condition: () -> Bool
private var compute: () -> Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.compute = wrappedValue
self.condition = condition
}
var wrappedValue: Value {
if value == nil || condition() {
value = compute()
}
return value!
}
}
struct Person {
@Cached(condition: { age > 18 })
var isAdult: Bool {
age > 18
}
var age: Int
}```swift
protocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var value: Value?
private var condition: () -> Bool
private var compute: () -> Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.compute = wrappedValue
self.condition = condition
}
var wrappedValue: Value {
if value == nil || condition() {
value = compute()
}
return value!
}
}
// Example usage:
struct Person {
@Cached(condition: { age > 18 })
var isAdult: Bool {
age > 18
}
var age: Int
}
let person = Person(age: 20)
print(person.isAdult) // Output: true
person.age = 15
print(person.isAdult) // Output: true (cached value is used)
person.age = 25
print(person.isAdult) // Output: true (value is recomputed due to age change)
```value = compute() // cannot assign to property: 'self' is immutable@Cached(condition: { age > 18 }) // property wrapper cannot be applied to a computed property@Cached(condition: { age > 18 }) // variable with getter/setter cannot have an initial value@Cached(condition: { age > 18 }) // missing argument for parameter 'wrappedValue' in call@Cached(condition: { age > 18 }) // cannot use instance member 'age' within property initializer; property initializers run before 'self' is availableprotocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var value: Value?
private let condition: () -> Bool
private let compute: () -> Value
var wrappedValue: Value {
mutating get {
if condition() {
value = compute()
}
return value!
}
}
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.compute = wrappedValue
self.condition = condition
}
}
struct Person {
@Cached(wrappedValue: { Date() }, condition: { true })
var currentTime: Date
@Cached(wrappedValue: { "Hello, World!" }, condition: { true })
var greeting: String
}```swift
protocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var value: Value?
private let condition: () -> Bool
private let compute: () -> Value
var wrappedValue: Value {
mutating get {
if condition() {
value = compute()
}
return value!
}
}
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.compute = wrappedValue
self.condition = condition
}
}
// Example usage of the Cached property wrapper
struct Person {
@Cached(wrappedValue: { Date() }, condition: { true })
var currentTime: Date
@Cached(wrappedValue: { "Hello, World!" }, condition: { true })
var greeting: String
}
// Create an instance of the Person struct
var person = Person()
// Access the cached property
print(person.currentTime) // This will print the current time
print(person.greeting) // This will print "Hello, World!"
// Change the condition to force recomputation
person.currentTime = Date()
person.greeting = "Hello, Swift!"
// Access the cached property again
print(person.currentTime) // This will print a new time
print(person.greeting) // This will print "Hello, Swift!"
```@Cached(wrappedValue: { Date() }, condition: { true }) // add () to forward @autoclosure parameter@Cached(wrappedValue: { "Hello, World!" }, condition: { true }) // add () to forward @autoclosure parameterprotocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var value: Value?
private let condition: () -> Bool
private let compute: () -> Value
var wrappedValue: Value {
mutating get {
if condition() {
value = compute()
}
return value!
}
set {
value = newValue
}
}
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.compute = wrappedValue
self.condition = condition
}
}
struct DataSource {
@Cached(wrappedValue: { expensiveComputation() }, condition: { DataSource.shouldUpdateCache })
var cachedValue: Int
static var shouldUpdateCache: Bool {
// Simulate a condition that determines when to update the cache
return Bool.random()
}
}
func expensiveComputation() -> Int {
// Simulate an expensive computation
return Int.random(in: 1...100)
}
func main() {
let dataSource = DataSource()
print("Initial cached value: \(dataSource.cachedValue)")
// Simulate a change in the condition that would trigger an update
DataSource.shouldUpdateCache = true
print("Updated cached value: \(dataSource.cachedValue)")
}```swift
protocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var value: Value?
private let condition: () -> Bool
private let compute: () -> Value
var wrappedValue: Value {
mutating get {
if condition() {
value = compute()
}
return value!
}
set {
value = newValue
}
}
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.compute = wrappedValue
self.condition = condition
}
}
// Example usage:
struct DataSource {
@Cached(wrappedValue: { expensiveComputation() }, condition: { DataSource.shouldUpdateCache })
var cachedValue: Int
static var shouldUpdateCache: Bool {
// Simulate a condition that determines when to update the cache
return Bool.random()
}
}
func expensiveComputation() -> Int {
// Simulate an expensive computation
return Int.random(in: 1...100)
}
// Main function to test the generated code
func main() {
let dataSource = DataSource()
print("Initial cached value: \(dataSource.cachedValue)")
// Simulate a change in the condition that would trigger an update
DataSource.shouldUpdateCache = true
print("Updated cached value: \(dataSource.cachedValue)")
}
main()
```@Cached(wrappedValue: { expensiveComputation() }, condition: { DataSource.shouldUpdateCache }) // add () to forward @autoclosure parameterprint("Initial cached value: \(dataSource.cachedValue)") // cannot use mutating getter on immutable value: 'dataSource' is a 'let' constantDataSource.shouldUpdateCache = true // cannot assign to property: 'shouldUpdateCache' is a get-only propertyprint("Updated cached value: \(dataSource.cachedValue)") // cannot use mutating getter on immutable value: 'dataSource' is a 'let' constantprotocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var value: Value?
private let condition: () -> Bool
private let compute: () -> Value
var wrappedValue: Value {
mutating get {
if condition() {
value = nil
}
if value == nil {
value = compute()
}
return value!
}
set {
value = newValue
}
}
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.compute = wrappedValue
self.condition = condition
}
}
struct Person {
@Cached(condition: { Date().timeIntervalSince1970 % 5 == 0 })
var currentTime: Date {
Date()
}
@Cached(condition: { Date().timeIntervalSince1970 % 2 == 0 })
var randomNumber: Int {
Int.random(in: 1...100)
}
}```swift
protocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var value: Value?
private let condition: () -> Bool
private let compute: () -> Value
var wrappedValue: Value {
mutating get {
if condition() {
value = nil
}
if value == nil {
value = compute()
}
return value!
}
set {
value = newValue
}
}
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.compute = wrappedValue
self.condition = condition
}
}
// Example usage:
struct Person {
@Cached(condition: { Date().timeIntervalSince1970 % 5 == 0 })
var currentTime: Date {
Date()
}
@Cached(condition: { Date().timeIntervalSince1970 % 2 == 0 })
var randomNumber: Int {
Int.random(in: 1...100)
}
}
let person = Person()
// The currentTime property will be recomputed every 5 seconds
print(person.currentTime)
sleep(5)
print(person.currentTime)
// The randomNumber property will be recomputed every 2 seconds
print(person.randomNumber)
sleep(2)
print(person.randomNumber)
```@Cached(condition: { Date().timeIntervalSince1970 % 5 == 0 }) // variable with getter/setter cannot have an initial value@Cached(condition: { Date().timeIntervalSince1970 % 5 == 0 }) // missing argument for parameter 'wrappedValue' in call@Cached(condition: { Date().timeIntervalSince1970 % 5 == 0 }) // property wrapper cannot be applied to a computed property@Cached(condition: { Date().timeIntervalSince1970 % 2 == 0 }) // property wrapper cannot be applied to a computed property@Cached(condition: { Date().timeIntervalSince1970 % 2 == 0 }) // variable with getter/setter cannot have an initial value@Cached(condition: { Date().timeIntervalSince1970 % 2 == 0 }) // missing argument for parameter 'wrappedValue' in callprotocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var value: Value?
private let condition: () -> Bool
private let compute: () -> Value
var wrappedValue: Value {
mutating get {
if condition() {
value = nil
}
if value == nil {
value = compute()
}
return value!
}
set {
value = newValue
}
}
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.compute = wrappedValue
self.condition = condition
}
}
struct Person {
@Cached(wrappedValue: { Date() }, condition: { false })
var currentDate
@Cached(wrappedValue: { Int.random(in: 1...100) }, condition: { false })
var randomNumber
}```swift
protocol CachedProperty {
associatedtype Value
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool)
}
// Property wrapper that caches the computed value of a property and recomputes it only when a specified condition changes.
@propertyWrapper
struct Cached<Value>: CachedProperty {
private var value: Value?
private let condition: () -> Bool
private let compute: () -> Value
var wrappedValue: Value {
mutating get {
if condition() {
value = nil
}
if value == nil {
value = compute()
}
return value!
}
set {
value = newValue
}
}
init(wrappedValue: @autoclosure @escaping () -> Value, condition: @escaping () -> Bool) {
self.compute = wrappedValue
self.condition = condition
}
}
// Example usage of the Cached property wrapper
struct Person {
@Cached(wrappedValue: { Date() }, condition: { false })
var currentDate
@Cached(wrappedValue: { Int.random(in: 1...100) }, condition: { false })
var randomNumber
}
let person = Person()
print(person.currentDate) // This will always print the same date because the condition is always false.
print(person.randomNumber) // This will always print the same random number because the condition is always false.
```infix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence {
associativity: left
higherThan: AdditionPrecedence
}
func compose<A, B, C>(_ f: @escaping (B) -> C, _ g: @escaping (A) -> B) -> (A) -> C {
return { f(g($0)) }
}
func addTwo(_ x: Int) -> Int {
return x + 2
}
func multiplyByThree(_ x: Int) -> Int {
return x * 3
}```swift
infix operator >>>: FunctionCompositionPrecedence
// Custom infix operator >>> that composes two functions. The operator should take two functions and return a new function that represents the composition of the two functions (i.e., the output of the first function becomes the input of the second function).
precedencegroup FunctionCompositionPrecedence {
associativity: left
higherThan: AdditionPrecedence
}
func compose<A, B, C>(_ f: @escaping (B) -> C, _ g: @escaping (A) -> B) -> (A) -> C {
return { f(g($0)) }
}
func addTwo(_ x: Int) -> Int {
return x + 2
}
func multiplyByThree(_ x: Int) -> Int {
return x * 3
}
let composedFunction = multiplyByThree >>> addTwo
let result = composedFunction(5) // Should return 15, which is (5 * 3) + 2
print(result) // Output: 15
```let composedFunction = doubleDescription >>> stringCount // cannot find operator '>>>' in scopeinfix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence {
associativity: left
higherThan: MultiplicationPrecedence
}
func compose<A, B, C>(_ f: @escaping (B) -> C, _ g: @escaping (A) -> B) -> (A) -> C {
return { f(g($0)) }
}```swift
infix operator >>>: FunctionCompositionPrecedence
// Custom infix operator >>> that composes two functions. The operator should take two functions and return a new function that represents the composition of the two functions (i.e., the output of the first function becomes the input of the second function).
precedencegroup FunctionCompositionPrecedence {
associativity: left
higherThan: MultiplicationPrecedence
}
func compose<A, B, C>(_ f: @escaping (B) -> C, _ g: @escaping (A) -> B) -> (A) -> C {
return { f(g($0)) }
}
// Compose two functions
let addOne = { (x: Int) -> Int in
return x + 1
}
let multiplyByTwo = { (x: Int) -> Int in
return x * 2
}
let composedFunction = compose(addOne, multiplyByTwo)
let result = composedFunction(3) // Should return 7, because (3 * 2) + 1 = 7
print(result) // Output: 7
```let composedFunction = doubleDescription >>> stringCount // cannot find operator '>>>' in scopeinfix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence {
associativity: left
higherThan: AdditionPrecedence
}
func compose<A, B, C>(_ f: @escaping (B) -> C, _ g: @escaping (A) -> B) -> (A) -> C {
return { f(g($0)) }
}```swift
infix operator >>>: FunctionCompositionPrecedence
// Custom infix operator >>> that composes two functions. The operator should take two functions and return a new function that represents the composition of the two functions (i.e., the output of the first function becomes the input of the second function).
precedencegroup FunctionCompositionPrecedence {
associativity: left
higherThan: AdditionPrecedence
}
func compose<A, B, C>(_ f: @escaping (B) -> C, _ g: @escaping (A) -> B) -> (A) -> C {
return { f(g($0)) }
}
// Example usage:
let addOne: (Int) -> Int = { $0 + 1 }
let multiplyByTwo: (Int) -> Int = { $0 * 2 }
let composedFunction = compose(multiplyByTwo, addOne)
let result = composedFunction(3) // Should return 8, because (3 + 1) * 2 = 8
print(result) // Output: 8
```let composedFunction = doubleDescription >>> stringCount // cannot find operator '>>>' in scopeinfix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence {
associativity: left
higherThan: MultiplicationPrecedence
}
func >>> <A, B, C>(_ f: @escaping (A) -> B, _ g: @escaping (B) -> C) -> (A) -> C {
return { x in g(f(x)) }
}```swift
infix operator >>>: FunctionCompositionPrecedence
// Custom infix operator >>> that composes two functions. The operator should take two functions and return a new function that represents the composition of the two functions (i.e., the output of the first function becomes the input of the second function).
precedencegroup FunctionCompositionPrecedence {
associativity: left
higherThan: MultiplicationPrecedence
}
func >>> <A, B, C>(_ f: @escaping (A) -> B, _ g: @escaping (B) -> C) -> (A) -> C {
return { x in g(f(x)) }
}
// Example usage:
let addOne = { (x: Int) -> Int in x + 1 }
let multiplyByTwo = { (x: Int) -> Int in x * 2 }
// Composing the functions
let composedFunction = addOne >>> multiplyByTwo
// Calling the composed function
let result = composedFunction(3) // Should output 8
print(result) // Output: 8
```infix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence {
associativity: left
higherThan: MultiplicationPrecedence
}
func >>> <A, B, C>(_ f: @escaping (A) -> B, _ g: @escaping (B) -> C) -> (A) -> C {
return { a in g(f(a)) }
}```swift
infix operator >>>: FunctionCompositionPrecedence
// Custom infix operator >>> that composes two functions. The operator should take two functions and return a new function that represents the composition of the two functions (i.e., the output of the first function becomes the input of the second function).
precedencegroup FunctionCompositionPrecedence {
associativity: left
higherThan: MultiplicationPrecedence
}
func >>> <A, B, C>(_ f: @escaping (A) -> B, _ g: @escaping (B) -> C) -> (A) -> C {
return { a in g(f(a)) }
}
// Example usage:
let addOne: (Int) -> Int = { $0 + 1 }
let multiplyByTwo: (Int) -> Int = { $0 * 2 }
// Composing the functions
let composedFunction = addOne >>> multiplyByTwo
// Calling the composed function
let result = composedFunction(3) // Output: 8
print(result) // Should print 8
```infix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence {
associativity: left
higherThan: MultiplicationPrecedence
}
func >>> <A, B, C>(f: @escaping (A) -> B, g: @escaping (B) -> C) -> (A) -> C {
return { x in g(f(x)) }
}```swift
infix operator >>>: FunctionCompositionPrecedence
// Custom infix operator >>> that composes two functions. The operator should take two functions and return a new function that represents the composition of the two functions (i.e., the output of the first function becomes the input of the second function).
precedencegroup FunctionCompositionPrecedence {
associativity: left
higherThan: MultiplicationPrecedence
}
func >>> <A, B, C>(f: @escaping (A) -> B, g: @escaping (B) -> C) -> (A) -> C {
return { x in g(f(x)) }
}
// Example usage:
let addOne = { (x: Int) -> Int in x + 1 }
let multiplyByTwo = { (x: Int) -> Int in x * 2 }
// Composing the functions
let composedFunction = addOne >>> multiplyByTwo
// Calling the composed function
let result = composedFunction(3) // Should return 8
print(result) // Output: 8
```infix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence {
associativity: left
higherThan: MultiplicationPrecedence
}
func >>> <A, B, C>(_ f: @escaping (A) -> B, _ g: @escaping (B) -> C) -> (A) -> C {
return { x in g(f(x)) }
}```swift
infix operator >>>: FunctionCompositionPrecedence
// Custom infix operator >>> that composes two functions. The operator should take two functions and return a new function that represents the composition of the two functions (i.e., the output of the first function becomes the input of the second function).
precedencegroup FunctionCompositionPrecedence {
associativity: left
higherThan: MultiplicationPrecedence
}
func >>> <A, B, C>(_ f: @escaping (A) -> B, _ g: @escaping (B) -> C) -> (A) -> C {
return { x in g(f(x)) }
}
// Example usage:
let addOne: (Int) -> Int = { $0 + 1 }
let double: (Int) -> Int = { $0 * 2 }
let composedFunction = addOne >>> double
let result = composedFunction(3) // Should return 8
print(result) // Output: 8
```infix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence {
associativity: left
higherThan: AdditionPrecedence
}
func >>> <A, B, C>(_ f: @escaping (A) -> B, _ g: @escaping (B) -> C) -> (A) -> C {
return { x in g(f(x)) }
}```swift
infix operator >>>: FunctionCompositionPrecedence
// Custom infix operator >>> that composes two functions. The operator should take two functions and return a new function that represents the composition of the two functions (i.e., the output of the first function becomes the input of the second function).
precedencegroup FunctionCompositionPrecedence {
associativity: left
higherThan: AdditionPrecedence
}
func >>> <A, B, C>(_ f: @escaping (A) -> B, _ g: @escaping (B) -> C) -> (A) -> C {
return { x in g(f(x)) }
}
// Example usage:
let increment = { (x: Int) -> Int in x + 1 }
let double = { (x: Int) -> Int in x * 2 }
let composedFunction = increment >>> double
let result = composedFunction(3) // Should return 8, since (3 + 1) * 2 = 8
print(result) // Output: 8
```infix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence {
associativity: left
higherThan: AdditionPrecedence
}
func >>> <A, B, C>(_ f: @escaping (A) -> B, _ g: @escaping (B) -> C) -> (A) -> C {
return { x in g(f(x)) }
}```swift
infix operator >>>: FunctionCompositionPrecedence
// Custom infix operator >>> that composes two functions. The operator should take two functions and return a new function that represents the composition of the two functions (i.e., the output of the first function becomes the input of the second function).
precedencegroup FunctionCompositionPrecedence {
associativity: left
higherThan: AdditionPrecedence
}
func >>> <A, B, C>(_ f: @escaping (A) -> B, _ g: @escaping (B) -> C) -> (A) -> C {
return { x in g(f(x)) }
}
// Example usage:
let addOne: (Int) -> Int = { $0 + 1 }
let multiplyByTwo: (Int) -> Int = { $0 * 2 }
// Composing functions
let composedFunction = addOne >>> multiplyByTwo
let result = composedFunction(3) // Should output 8
print(result) // Output: 8
```infix operator >>>: FunctionCompositionPrecedence
precedencegroup FunctionCompositionPrecedence {
associativity: left
higherThan: AdditionPrecedence
}
func >>> <A, B, C>(f: @escaping (A) -> B, g: @escaping (B) -> C) -> (A) -> C {
return { a in g(f(a)) }
}```swift
infix operator >>>: FunctionCompositionPrecedence
// Custom infix operator >>> that composes two functions. The operator should take two functions and return a new function that represents the composition of the two functions (i.e., the output of the first function becomes the input of the second function).
precedencegroup FunctionCompositionPrecedence {
associativity: left
higherThan: AdditionPrecedence
}
func >>> <A, B, C>(f: @escaping (A) -> B, g: @escaping (B) -> C) -> (A) -> C {
return { a in g(f(a)) }
}
// Example usage:
let addOne: (Int) -> Int = { $0 + 1 }
let double: (Int) -> Int = { $0 * 2 }
// Composing functions
let composedFunction = addOne >>> double
// Applying the composed function
let result = composedFunction(3) // Output: 8
print(result) // Should print 8
```import CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
var hash = SHA256()
var buffer = [UInt8](repeating: 0, count: bufferSize)
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
if bytesRead < 0 {
fatalError("Error reading from input stream")
}
hash.update(data: Data(buffer[0..<bytesRead]))
}
return hash.finalize()
}
func main() {
// Create a sample input stream
let inputStream = InputStream(data: "Hello, World!".data(using: .utf8)!)
// Compute the SHA-256 hash of the input stream with a buffer size of 1024 bytes
let hash = computeSHA256Hash(of: inputStream, bufferSize: 1024)
// Print the hexadecimal representation of the hash
print("SHA-256 Hash: \(hash.hexString)")
}
extension Data {
var hexString: String {
return map { String(format: "%02hhx", $0) }.joined()
}
}```swift
import CryptoKit
// Function that computes the SHA-256 hash of data read from a stream with a specified buffer size using Apple's CryptoKit framework.
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
var hash = SHA256()
var buffer = [UInt8](repeating: 0, count: bufferSize)
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
if bytesRead < 0 {
fatalError("Error reading from input stream")
}
hash.update(data: Data(buffer[0..<bytesRead]))
}
return hash.finalize()
}
// Main function to test the computeSHA256Hash function.
func main() {
// Create a sample input stream
let inputStream = InputStream(data: "Hello, World!".data(using: .utf8)!)
// Compute the SHA-256 hash of the input stream with a buffer size of 1024 bytes
let hash = computeSHA256Hash(of: inputStream, bufferSize: 1024)
// Print the hexadecimal representation of the hash
print("SHA-256 Hash: \(hash.hexString)")
}
// Extension to convert Data to a hexadecimal string
extension Data {
var hexString: String {
return map { String(format: "%02hhx", $0) }.joined()
}
}
// Run the main function
main()
```print("SHA-256 Hash: \(hash.hexString)") // value of type 'SHA256Digest' has no member 'hexString'import CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
var hash = SHA256()
var buffer = [UInt8](repeating: 0, count: bufferSize)
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
if bytesRead > 0 {
hash.update(data: Data(buffer[0..<bytesRead]))
}
}
return hash.finalize()
}
func main() {
// Example usage:
// Assuming we have an InputStream object `inputStream` and a buffer size `bufferSize`.
// let hash = computeSHA256Hash(of: inputStream, bufferSize: bufferSize)
// print(hash)
}```swift
import CryptoKit
// Function that computes the SHA-256 hash of data read from a stream with a specified buffer size using Apple's CryptoKit framework.
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
var hash = SHA256()
var buffer = [UInt8](repeating: 0, count: bufferSize)
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
if bytesRead > 0 {
hash.update(data: Data(buffer[0..<bytesRead]))
}
}
return hash.finalize()
}
// Main function to test the computeSHA256Hash function.
func main() {
// Example usage:
// Assuming we have an InputStream object `inputStream` and a buffer size `bufferSize`.
// let hash = computeSHA256Hash(of: inputStream, bufferSize: bufferSize)
// print(hash)
}
main()
```import CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
var hash = SHA256()
var buffer = [UInt8](repeating: 0, count: bufferSize)
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
if bytesRead < 0 {
fatalError("Error reading from stream")
}
hash.update(data: Data(bytes: buffer, count: bytesRead))
}
return hash.finalize()
}
func main() {
// Create a sample input stream
let inputStream = InputStream(data: "Hello, World!".data(using: .utf8)!)
// Compute the SHA-256 hash with a buffer size of 1024 bytes
let hash = computeSHA256Hash(of: inputStream, bufferSize: 1024)
// Print the hexadecimal representation of the hash
print(hash.hexString)
}```swift
import CryptoKit
// Function that computes the SHA-256 hash of data read from a stream with a specified buffer size using Apple's CryptoKit framework.
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
var hash = SHA256()
var buffer = [UInt8](repeating: 0, count: bufferSize)
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
if bytesRead < 0 {
fatalError("Error reading from stream")
}
hash.update(data: Data(bytes: buffer, count: bytesRead))
}
return hash.finalize()
}
// Main function to test the computeSHA256Hash function.
func main() {
// Create a sample input stream
let inputStream = InputStream(data: "Hello, World!".data(using: .utf8)!)
// Compute the SHA-256 hash with a buffer size of 1024 bytes
let hash = computeSHA256Hash(of: inputStream, bufferSize: 1024)
// Print the hexadecimal representation of the hash
print(hash.hexString)
}
// Run the main function to test the computeSHA256Hash function.
main()
```print(hash.hexString) // value of type 'SHA256Digest' has no member 'hexString'import CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
var hash = SHA256()
var buffer = [UInt8](repeating: 0, count: bufferSize)
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
if bytesRead < 0 {
fatalError("Error reading from input stream")
}
hash.update(data: Data(buffer[0..<bytesRead]))
}
return hash.finalize()
}```swift
import CryptoKit
// Function that computes the SHA-256 hash of data read from a stream with a specified buffer size using Apple's CryptoKit framework.
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
var hash = SHA256()
var buffer = [UInt8](repeating: 0, count: bufferSize)
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
if bytesRead < 0 {
fatalError("Error reading from input stream")
}
hash.update(data: Data(buffer[0..<bytesRead]))
}
return hash.finalize()
}
// Example usage:
let inputStream = InputStream(data: "Hello, World!".data(using: .utf8)!)
let hash = computeSHA256Hash(of: inputStream, bufferSize: 1024)
print(hash.hexString) // Output: 65a8e27d8879283831b664bd8b7f0ad4ca116262d224d2afa8a5ac76ef8d62e2
```import CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
var hash = SHA256()
var buffer = [UInt8](repeating: 0, count: bufferSize)
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
if bytesRead < 0 {
fatalError("Error reading from stream")
}
hash.update(data: Data(buffer[0..<bytesRead]))
}
return hash.finalize()
}```swift
import CryptoKit
// Function that computes the SHA-256 hash of data read from a stream with a specified buffer size using Apple's CryptoKit framework.
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
var hash = SHA256()
var buffer = [UInt8](repeating: 0, count: bufferSize)
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
if bytesRead < 0 {
fatalError("Error reading from stream")
}
hash.update(data: Data(buffer[0..<bytesRead]))
}
return hash.finalize()
}
// Example usage:
let fileURL = URL(fileURLWithPath: "/path/to/file.txt")
let fileStream = InputStream(url: fileURL)!
let hash = computeSHA256Hash(of: fileStream, bufferSize: 1024)
print("SHA-256 Hash: \(hash.hexString)")
```import CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
var context = SHA256()
var buffer = [UInt8](repeating: 0, count: bufferSize)
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
if bytesRead < 0 {
fatalError("Error reading from stream")
}
context.update(data: Data(bytes: buffer, count: bytesRead))
}
return context.finalize()
}```swift
import CryptoKit
// Function that computes the SHA-256 hash of data read from a stream with a specified buffer size using Apple's CryptoKit framework.
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
var context = SHA256()
var buffer = [UInt8](repeating: 0, count: bufferSize)
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
if bytesRead < 0 {
fatalError("Error reading from stream")
}
context.update(data: Data(bytes: buffer, count: bytesRead))
}
return context.finalize()
}
// Example usage:
let inputStream = InputStream(data: Data("Hello, World!".utf8))
let hash = computeSHA256Hash(of: inputStream, bufferSize: 1024)
print(hash.hexString) // Prints the hexadecimal representation of the hash
```import CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
var hash = SHA256()
let buffer = UnsafeMutablePointer<UInt8>.allocate(capacity: bufferSize)
defer {
buffer.deallocate()
}
while inputStream.hasBytesAvailable {
let readBytes = inputStream.read(buffer, maxLength: bufferSize)
if readBytes > 0 {
hash.update(data: Data(bytes: buffer, count: readBytes))
}
}
return hash.finalize()
}```swift
import CryptoKit
// Function that computes the SHA-256 hash of data read from a stream with a specified buffer size using Apple's CryptoKit framework.
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
var hash = SHA256()
let buffer = UnsafeMutablePointer<UInt8>.allocate(capacity: bufferSize)
defer {
buffer.deallocate()
}
while inputStream.hasBytesAvailable {
let readBytes = inputStream.read(buffer, maxLength: bufferSize)
if readBytes > 0 {
hash.update(data: Data(bytes: buffer, count: readBytes))
}
}
return hash.finalize()
}
// Example usage:
let data = "Hello, World!".data(using: .utf8)!
let inputStream = InputStream(data: data)
let hash = computeSHA256Hash(of: inputStream, bufferSize: 1024)
print(hash.hexString) // Prints the hexadecimal representation of the hash
```import CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
var hash = SHA256()
// Read data from the input stream in chunks and update the hash.
while inputStream.hasBytesAvailable {
let buffer = UnsafeMutablePointer<UInt8>.allocate(capacity: bufferSize)
let bytesRead = inputStream.read(buffer, maxLength: bufferSize)
if bytesRead > 0 {
hash.update(data: Data(bytes: buffer, count: bytesRead))
}
buffer.deallocate()
}
// Finalize the hash computation and return the digest.
return hash.finalize()
}```swift
import CryptoKit
// Function that computes the SHA-256 hash of data read from a stream with a specified buffer size using Apple's CryptoKit framework.
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
var hash = SHA256()
// Read data from the input stream in chunks and update the hash.
while inputStream.hasBytesAvailable {
let buffer = UnsafeMutablePointer<UInt8>.allocate(capacity: bufferSize)
let bytesRead = inputStream.read(buffer, maxLength: bufferSize)
if bytesRead > 0 {
hash.update(data: Data(bytes: buffer, count: bytesRead))
}
buffer.deallocate()
}
// Finalize the hash computation and return the digest.
return hash.finalize()
}
// Example usage:
// Assuming we have an InputStream object named 'inputStream' and we want to compute the hash with a buffer size of 4096 bytes.
let bufferSize = 4096
let hash = computeSHA256Hash(of: inputStream, bufferSize: bufferSize)
print(hash)
```import CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
var hash = SHA256()
let buffer = UnsafeMutablePointer<UInt8>.allocate(capacity: bufferSize)
defer { buffer.deallocate() }
while inputStream.hasBytesAvailable {
let read = inputStream.read(buffer, maxLength: bufferSize)
if read < 0 {
fatalError("Error reading from stream")
}
hash.update(data: Data(bytes: buffer, count: read))
}
return hash.finalize()
}```swift
import CryptoKit
// Function that computes the SHA-256 hash of data read from a stream with a specified buffer size using Apple's CryptoKit framework.
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
var hash = SHA256()
let buffer = UnsafeMutablePointer<UInt8>.allocate(capacity: bufferSize)
defer { buffer.deallocate() }
while inputStream.hasBytesAvailable {
let read = inputStream.read(buffer, maxLength: bufferSize)
if read < 0 {
fatalError("Error reading from stream")
}
hash.update(data: Data(bytes: buffer, count: read))
}
return hash.finalize()
}
// Example usage:
let data = "Hello, World!".data(using: .utf8)!
let inputStream = InputStream(data: data)
let hash = computeSHA256Hash(of: inputStream, bufferSize: 1024)
print(hash.hexString) // Output: 65a8e27d8879283831b664bd8b7f0ad4ca116262d224d1a5e08dde91ee9d8fcf
```import CryptoKit
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
var hash = SHA256()
var buffer = [UInt8](repeating: 0, count: bufferSize)
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
if bytesRead < 0 {
fatalError("Error reading from input stream")
}
hash.update(data: Data(buffer[0..<bytesRead]))
}
return hash.finalize()
}```swift
import CryptoKit
// Function that computes the SHA-256 hash of data read from a stream with a specified buffer size using Apple's CryptoKit framework.
func computeSHA256Hash(of inputStream: InputStream, bufferSize: Int) -> SHA256Digest {
var hash = SHA256()
var buffer = [UInt8](repeating: 0, count: bufferSize)
while inputStream.hasBytesAvailable {
let bytesRead = inputStream.read(&buffer, maxLength: bufferSize)
if bytesRead < 0 {
fatalError("Error reading from input stream")
}
hash.update(data: Data(buffer[0..<bytesRead]))
}
return hash.finalize()
}
// Example usage:
let fileURL = URL(fileURLWithPath: "/path/to/file.txt")
let inputStream = InputStream(url: fileURL)!
let hash = computeSHA256Hash(of: inputStream, bufferSize: 1024)
let hashString = hash.map { String(format: "%02x", $0) }.joined()
print("SHA-256 Hash: \(hashString)")
```typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
extension String {
init(tuple16: Tuple16) {
var buffer = [Int8](repeating: 0, count: 17)
for (index, value) in tuple16.enumerated() {
buffer[index] = value
}
self.init(cString: buffer)
}
}```swift
typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
var buffer = [Int8](repeating: 0, count: 17)
for (index, value) in tuple16.enumerated() {
buffer[index] = value
}
self.init(cString: buffer)
}
}
// Example usage:
let tuple16: Tuple16 = (72, 101, 108, 108, 111, 44, 32, 87, 111, 114, 108, 100, 33, 0, 0, 0)
let stringFromTuple = String(tuple16: tuple16)
print(stringFromTuple) // Output: Hello, World!
```for (index, value) in tuple16.enumerated() { // value of tuple type 'Tuple16' (aka '(Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)') has no member 'enumerated'typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
extension String {
init(tuple16: Tuple16) {
var chars = [Int8](tuple16)
// Find the index of the null terminator
if let nullIndex = chars.firstIndex(of: 0) {
chars.removeSubrange(nullIndex...)
}
// Convert the array of Int8 to a String
self = String(cString: chars)
}
}```swift
typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
var chars = [Int8](tuple16)
// Find the index of the null terminator
if let nullIndex = chars.firstIndex(of: 0) {
chars.removeSubrange(nullIndex...)
}
// Convert the array of Int8 to a String
self = String(cString: chars)
}
}
// Example usage:
let tuple16: Tuple16 = (72, 101, 108, 108, 111, 44, 32, 87, 111, 114, 108, 100, 33, 0, 0, 0)
let stringFromTuple = String(tuple16: tuple16)
print(stringFromTuple) // Output: Hello, World!
```var chars = [Int8](tuple16) // no exact matches in call to initializertypealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
extension String {
init(tuple16: Tuple16) {
var bytes = [Int8](tuple16)
// Find the index of the first null byte to determine the length of the string
if let nullIndex = bytes.firstIndex(of: 0) {
bytes.removeSubrange(nullIndex..<bytes.endIndex)
}
self.init(cString: bytes)
}
}```swift
typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
var bytes = [Int8](tuple16)
// Find the index of the first null byte to determine the length of the string
if let nullIndex = bytes.firstIndex(of: 0) {
bytes.removeSubrange(nullIndex..<bytes.endIndex)
}
self.init(cString: bytes)
}
}
// Example usage:
let tuple16: Tuple16 = (72, 101, 108, 108, 111, 44, 32, 87, 111, 114, 108, 100, 33, 0, 0, 0)
let stringFromTuple = String(tuple16: tuple16)
print(stringFromTuple) // Output: Hello, World!
```var bytes = [Int8](tuple16) // no exact matches in call to initializertypealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
extension String {
init(tuple16: Tuple16) {
var buffer = [Int8](repeating: 0, count: 17) // 17 for null-termination
for (i, value) in tuple16.enumerated() {
buffer[i] = value
}
self.init(cString: buffer)
}
}```swift
typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
var buffer = [Int8](repeating: 0, count: 17) // 17 for null-termination
for (i, value) in tuple16.enumerated() {
buffer[i] = value
}
self.init(cString: buffer)
}
}
// Example usage:
let tuple16: Tuple16 = (72, 101, 108, 108, 111, 44, 32, 87, 111, 114, 108, 100, 33, 0, 0, 0) // "Hello, World!" with null-termination
let stringFromTuple = String(tuple16: tuple16)
print(stringFromTuple) // Output: Hello, World!
```for (i, value) in tuple16.enumerated() { // value of tuple type 'Tuple16' (aka '(Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)') has no member 'enumerated'typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
extension String {
init(tuple16: Tuple16) {
var chars = [Int8]()
for i in 0..<tuple16.count {
chars.append(tuple16[i])
}
self.init(cString: chars)
}
}
func tuple16ToString(_ tuple16: Tuple16) -> String {
return String(tuple16: tuple16)
}
func main() {
let tuple16: Tuple16 = (72, 101, 108, 108, 111, 44, 32, 87, 111, 114, 108, 100, 33, 0, 0, 0) // Represents "Hello, World!"
let string = tuple16ToString(tuple16)
print(string) // Output: Hello, World!
}```swift
typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
var chars = [Int8]()
for i in 0..<tuple16.count {
chars.append(tuple16[i])
}
self.init(cString: chars)
}
}
// Function to convert a tuple of 16 Int8 values to a String.
func tuple16ToString(_ tuple16: Tuple16) -> String {
return String(tuple16: tuple16)
}
// Main function to test the tuple16ToString function.
func main() {
let tuple16: Tuple16 = (72, 101, 108, 108, 111, 44, 32, 87, 111, 114, 108, 100, 33, 0, 0, 0) // Represents "Hello, World!"
let string = tuple16ToString(tuple16)
print(string) // Output: Hello, World!
}
// Execute the main function to run the test.
main()
```for i in 0..<tuple16.count { // value of tuple type 'Tuple16' (aka '(Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)') has no member 'count'typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
extension String {
init(tuple16: Tuple16) {
let charArray = tuple16.map { String(UnicodeScalar(UInt8($0))) }
self = String(charArray.joined())
}
}```swift
typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
let charArray = tuple16.map { String(UnicodeScalar(UInt8($0))) }
self = String(charArray.joined())
}
}
// Example usage:
let tuple16: Tuple16 = (72, 101, 108, 108, 111, 44, 32, 87, 111, 114, 108, 100, 33, 0, 0, 0)
let stringFromTuple = String(tuple16: tuple16)
print(stringFromTuple) // Output: Hello, World!
```let charArray = tuple16.map { String(UnicodeScalar(UInt8($0))) } // value of tuple type 'Tuple16' (aka '(Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)') has no member 'map'typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
extension String {
init(tuple16: Tuple16) {
var chars = [Int8](tuple16)
let nullIndex = chars.firstIndex(of: 0) ?? chars.count
chars.removeSubrange(nullIndex..<chars.count)
self.init(cString: chars)
}
}```swift
typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
var chars = [Int8](tuple16)
let nullIndex = chars.firstIndex(of: 0) ?? chars.count
chars.removeSubrange(nullIndex..<chars.count)
self.init(cString: chars)
}
}
// Example usage:
let tuple16: Tuple16 = (72, 101, 108, 108, 111, 44, 32, 87, 111, 114, 108, 100, 33, 0, 0, 0)
let stringFromTuple = String(tuple16: tuple16)
print(stringFromTuple) // Output: Hello, World!
```var chars = [Int8](tuple16) // no exact matches in call to initializertypealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
extension String {
init(tuple16: Tuple16) {
var chars = [Character]()
for i in 0..<tuple16.count {
if tuple16[i] == 0 {
break
}
chars.append(Character(UnicodeScalar(UInt32(tuple16[i] & 0xFF))!))
}
self.init(chars)
}
}```swift
typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
var chars = [Character]()
for i in 0..<tuple16.count {
if tuple16[i] == 0 {
break
}
chars.append(Character(UnicodeScalar(UInt32(tuple16[i] & 0xFF))!))
}
self.init(chars)
}
}
// Example usage:
let tuple16: Tuple16 = (72, 101, 108, 108, 111, 44, 32, 87, 111, 114, 108, 100, 33, 0, 0, 0)
let string = String(tuple16: tuple16)
print(string) // Output: Hello, World!
```for i in 0..<tuple16.count { // value of tuple type 'Tuple16' (aka '(Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)') has no member 'count'typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
extension String {
init(tuple16: Tuple16) {
var bytes = [Int8](tuple16)
if let nullIndex = bytes.firstIndex(of: 0) {
bytes.removeSubrange(nullIndex..<bytes.endIndex)
}
self.init(cString: bytes)
}
}```swift
typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
var bytes = [Int8](tuple16)
if let nullIndex = bytes.firstIndex(of: 0) {
bytes.removeSubrange(nullIndex..<bytes.endIndex)
}
self.init(cString: bytes)
}
}
// Example usage:
let tuple16: Tuple16 = (72, 101, 108, 108, 111, 44, 32, 87, 111, 114, 108, 100, 33, 0, 0, 0)
let stringFromTuple = String(tuple16: tuple16)
print(stringFromTuple) // Output: Hello, World!
```var bytes = [Int8](tuple16) // no exact matches in call to initializertypealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
extension String {
init(tuple16: Tuple16) {
var bytes = tuple16.0.bytes + tuple16.1.bytes + tuple16.2.bytes + tuple16.3.bytes + tuple16.4.bytes + tuple16.5.bytes + tuple16.6.bytes + tuple16.7.bytes + tuple16.8.bytes + tuple16.9.bytes + tuple16.10.bytes + tuple16.11.bytes + tuple16.12.bytes + tuple16.13.bytes + tuple16.14.bytes + tuple16.15.bytes
let nullIndex = bytes.firstIndex(of: 0) ?? bytes.endIndex
bytes.removeSubrange(nullIndex..<bytes.endIndex)
self.init(bytes: bytes, encoding: .utf8) ?? ""
}
}```swift
typealias Tuple16 = (Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8, Int8)
// Extension to the String type that allows initializing a String from a tuple of 16 Int8 values, where the tuple represents a C-style null-terminated string.
extension String {
init(tuple16: Tuple16) {
var bytes = tuple16.0.bytes + tuple16.1.bytes + tuple16.2.bytes + tuple16.3.bytes + tuple16.4.bytes + tuple16.5.bytes + tuple16.6.bytes + tuple16.7.bytes + tuple16.8.bytes + tuple16.9.bytes + tuple16.10.bytes + tuple16.11.bytes + tuple16.12.bytes + tuple16.13.bytes + tuple16.14.bytes + tuple16.15.bytes
let nullIndex = bytes.firstIndex(of: 0) ?? bytes.endIndex
bytes.removeSubrange(nullIndex..<bytes.endIndex)
self.init(bytes: bytes, encoding: .utf8) ?? ""
}
}
// Example usage:
let tuple16: Tuple16 = (72, 101, 108, 108, 111, 44, 32, 87, 111, 114, 108, 100, 33, 0, 0, 0)
let stringFromTuple = String(tuple16: tuple16)
print(stringFromTuple) // Output: Hello, World!
```import CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
var equal: Bool = true
// Compare the size of the pixel buffers
equal = equal && (CVPixelBufferGetWidth(lhs) == CVPixelBufferGetWidth(rhs))
equal = equal && (CVPixelBufferGetHeight(lhs) == CVPixelBufferGetHeight(rhs))
// Compare the pixel format of the pixel buffers
equal = equal && (CVPixelBufferGetPixelFormatType(lhs) == CVPixelBufferGetPixelFormatType(rhs))
// Compare the content of the pixel buffers
CVPixelBufferLockBaseAddress(lhs, .readOnly)
CVPixelBufferLockBaseAddress(rhs, .readOnly)
let lhsBytes = CVPixelBufferGetBaseAddress(lhs)
let rhsBytes = CVPixelBufferGetBaseAddress(rhs)
let lhsBytesPerRow = CVPixelBufferGetBytesPerRow(lhs)
let rhsBytesPerRow = CVPixelBufferGetBytesPerRow(rhs)
let lhsHeight = CVPixelBufferGetHeight(lhs)
let rhsHeight = CVPixelBufferGetHeight(rhs)
for y in 0..<lhsHeight {
let lhsRow = lhsBytes.advanced(by: y * lhsBytesPerRow)
let rhsRow = rhsBytes.advanced(by: y * rhsBytesPerRow)
for x in 0..<lhsBytesPerRow {
let lhsPixel = lhsRow.advanced(by: x)
let rhsPixel = rhsRow.advanced(by: x)
equal = equal && (lhsPixel.pointee == rhsPixel.pointee)
}
}
CVPixelBufferUnlockBaseAddress(lhs, .readOnly)
CVPixelBufferUnlockBaseAddress(rhs, .readOnly)
return equal
}```swift
import CoreVideo
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers equal in size, pixel format, and content.
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
var equal: Bool = true
// Compare the size of the pixel buffers
equal = equal && (CVPixelBufferGetWidth(lhs) == CVPixelBufferGetWidth(rhs))
equal = equal && (CVPixelBufferGetHeight(lhs) == CVPixelBufferGetHeight(rhs))
// Compare the pixel format of the pixel buffers
equal = equal && (CVPixelBufferGetPixelFormatType(lhs) == CVPixelBufferGetPixelFormatType(rhs))
// Compare the content of the pixel buffers
CVPixelBufferLockBaseAddress(lhs, .readOnly)
CVPixelBufferLockBaseAddress(rhs, .readOnly)
let lhsBytes = CVPixelBufferGetBaseAddress(lhs)
let rhsBytes = CVPixelBufferGetBaseAddress(rhs)
let lhsBytesPerRow = CVPixelBufferGetBytesPerRow(lhs)
let rhsBytesPerRow = CVPixelBufferGetBytesPerRow(rhs)
let lhsHeight = CVPixelBufferGetHeight(lhs)
let rhsHeight = CVPixelBufferGetHeight(rhs)
for y in 0..<lhsHeight {
let lhsRow = lhsBytes.advanced(by: y * lhsBytesPerRow)
let rhsRow = rhsBytes.advanced(by: y * rhsBytesPerRow)
for x in 0..<lhsBytesPerRow {
let lhsPixel = lhsRow.advanced(by: x)
let rhsPixel = rhsRow.advanced(by: x)
equal = equal && (lhsPixel.pointee == rhsPixel.pointee)
}
}
CVPixelBufferUnlockBaseAddress(lhs, .readOnly)
CVPixelBufferUnlockBaseAddress(rhs, .readOnly)
return equal
}
// Example usage:
let pixelBuffer1: CVPixelBuffer = ... // Create a CVPixelBuffer object
let pixelBuffer2: CVPixelBuffer = ... // Create another CVPixelBuffer object
if pixelBuffer1 == pixelBuffer2 {
print("The pixel buffers are equal.")
} else {
print("The pixel buffers are not equal.")
}
```let lhsRow = lhsBytes.advanced(by: y * lhsBytesPerRow) // value of optional type 'UnsafeMutableRawPointer?' must be unwrapped to refer to member 'advanced' of wrapped base type 'UnsafeMutableRawPointer'let rhsRow = rhsBytes.advanced(by: y * rhsBytesPerRow) // value of optional type 'UnsafeMutableRawPointer?' must be unwrapped to refer to member 'advanced' of wrapped base type 'UnsafeMutableRawPointer'import CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
var equal: Bool = false
CVPixelBufferLockBaseAddress(lhs, .readOnly)
CVPixelBufferLockBaseAddress(rhs, .readOnly)
defer {
CVPixelBufferUnlockBaseAddress(lhs, .readOnly)
CVPixelBufferUnlockBaseAddress(rhs, .readOnly)
}
if CVPixelBufferGetWidth(lhs) == CVPixelBufferGetWidth(rhs) &&
CVPixelBufferGetHeight(lhs) == CVPixelBufferGetHeight(rhs) &&
CVPixelBufferGetPixelFormatType(lhs) == CVPixelBufferGetPixelFormatType(rhs) {
let lhsBytes = CVPixelBufferGetBaseAddress(lhs)
let rhsBytes = CVPixelBufferGetBaseAddress(rhs)
let lhsBytesPerRow = CVPixelBufferGetBytesPerRow(lhs)
let rhsBytesPerRow = CVPixelBufferGetBytesPerRow(rhs)
let lhsWidth = CVPixelBufferGetWidth(lhs)
let lhsHeight = CVPixelBufferGetHeight(lhs)
if lhsBytes != nil && rhsBytes != nil {
equal = memcmp(lhsBytes, rhsBytes, lhsWidth * lhsHeight * lhsBytesPerRow) == 0
}
}
return equal
}
func testPixelBufferEquality() {
let pixelBuffer1 = CVPixelBufferCreate(kCFAllocatorDefault, 640, 480, kCVPixelFormatType_32BGRA, nil, nil)
let pixelBuffer2 = CVPixelBufferCreate(kCFAllocatorDefault, 640, 480, kCVPixelFormatType_32BGRA, nil, nil)
// Set pixel buffer data for pixelBuffer1
// ...
// Set pixel buffer data for pixelBuffer2
// ...
XCTAssertTrue(pixelBuffer1 == pixelBuffer2, "Pixel buffers should be equal")
}```swift
import CoreVideo
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers equal in size, pixel format, and content.
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
var equal: Bool = false
CVPixelBufferLockBaseAddress(lhs, .readOnly)
CVPixelBufferLockBaseAddress(rhs, .readOnly)
defer {
CVPixelBufferUnlockBaseAddress(lhs, .readOnly)
CVPixelBufferUnlockBaseAddress(rhs, .readOnly)
}
if CVPixelBufferGetWidth(lhs) == CVPixelBufferGetWidth(rhs) &&
CVPixelBufferGetHeight(lhs) == CVPixelBufferGetHeight(rhs) &&
CVPixelBufferGetPixelFormatType(lhs) == CVPixelBufferGetPixelFormatType(rhs) {
let lhsBytes = CVPixelBufferGetBaseAddress(lhs)
let rhsBytes = CVPixelBufferGetBaseAddress(rhs)
let lhsBytesPerRow = CVPixelBufferGetBytesPerRow(lhs)
let rhsBytesPerRow = CVPixelBufferGetBytesPerRow(rhs)
let lhsWidth = CVPixelBufferGetWidth(lhs)
let lhsHeight = CVPixelBufferGetHeight(lhs)
if lhsBytes != nil && rhsBytes != nil {
equal = memcmp(lhsBytes, rhsBytes, lhsWidth * lhsHeight * lhsBytesPerRow) == 0
}
}
return equal
}
// Unit test for the custom operator
func testPixelBufferEquality() {
let pixelBuffer1 = CVPixelBufferCreate(kCFAllocatorDefault, 640, 480, kCVPixelFormatType_32BGRA, nil, nil)
let pixelBuffer2 = CVPixelBufferCreate(kCFAllocatorDefault, 640, 480, kCVPixelFormatType_32BGRA, nil, nil)
// Set pixel buffer data for pixelBuffer1
// ...
// Set pixel buffer data for pixelBuffer2
// ...
XCTAssertTrue(pixelBuffer1 == pixelBuffer2, "Pixel buffers should be equal")
}
// Call the unit test function
testPixelBufferEquality()
```let rhsBytesPerRow = CVPixelBufferGetBytesPerRow(rhs) // initialization of immutable value 'rhsBytesPerRow' was never used; consider replacing with assignment to '_' or removing itlet pixelBuffer1 = CVPixelBufferCreate(kCFAllocatorDefault, 640, 480, kCVPixelFormatType_32BGRA, nil, nil) // 'nil' is not compatible with expected argument type 'UnsafeMutablePointer<CVPixelBuffer?>' (aka 'UnsafeMutablePointer<Optional<CVBuffer>>')let pixelBuffer2 = CVPixelBufferCreate(kCFAllocatorDefault, 640, 480, kCVPixelFormatType_32BGRA, nil, nil) // 'nil' is not compatible with expected argument type 'UnsafeMutablePointer<CVPixelBuffer?>' (aka 'UnsafeMutablePointer<Optional<CVBuffer>>')import CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
let lhsWidth = CVPixelBufferGetWidth(lhs)
let lhsHeight = CVPixelBufferGetHeight(lhs)
let lhsPixelFormat = CVPixelBufferGetPixelFormatType(lhs)
let rhsWidth = CVPixelBufferGetWidth(rhs)
let rhsHeight = CVPixelBufferGetHeight(rhs)
let rhsPixelFormat = CVPixelBufferGetPixelFormatType(rhs)
if lhsWidth != rhsWidth || lhsHeight != rhsHeight || lhsPixelFormat != rhsPixelFormat {
return false
}
var lhsData: UnsafeMutablePointer<UInt8>?
var rhsData: UnsafeMutablePointer<UInt8>?
CVPixelBufferLockBaseAddress(lhs, CVPixelBufferLockFlags(rawValue: 0))
CVPixelBufferLockBaseAddress(rhs, CVPixelBufferLockFlags(rawValue: 0))
defer {
CVPixelBufferUnlockBaseAddress(lhs, CVPixelBufferLockFlags(rawValue: 0))
CVPixelBufferUnlockBaseAddress(rhs, CVPixelBufferLockFlags(rawValue: 0))
}
lhsData = CVPixelBufferGetBaseAddress(lhs)
rhsData = CVPixelBufferGetBaseAddress(rhs)
if lhsData == nil || rhsData == nil {
return false
}
let lhsBytesPerRow = CVPixelBufferGetBytesPerRow(lhs)
let rhsBytesPerRow = CVPixelBufferGetBytesPerRow(rhs)
let lhsDataSize = lhsBytesPerRow * lhsHeight
let rhsDataSize = rhsBytesPerRow * rhsHeight
return memcmp(lhsData, rhsData, min(lhsDataSize, rhsDataSize)) == 0
}```swift
import CoreVideo
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers equal in size, pixel format, and content.
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
let lhsWidth = CVPixelBufferGetWidth(lhs)
let lhsHeight = CVPixelBufferGetHeight(lhs)
let lhsPixelFormat = CVPixelBufferGetPixelFormatType(lhs)
let rhsWidth = CVPixelBufferGetWidth(rhs)
let rhsHeight = CVPixelBufferGetHeight(rhs)
let rhsPixelFormat = CVPixelBufferGetPixelFormatType(rhs)
if lhsWidth != rhsWidth || lhsHeight != rhsHeight || lhsPixelFormat != rhsPixelFormat {
return false
}
var lhsData: UnsafeMutablePointer<UInt8>?
var rhsData: UnsafeMutablePointer<UInt8>?
CVPixelBufferLockBaseAddress(lhs, CVPixelBufferLockFlags(rawValue: 0))
CVPixelBufferLockBaseAddress(rhs, CVPixelBufferLockFlags(rawValue: 0))
defer {
CVPixelBufferUnlockBaseAddress(lhs, CVPixelBufferLockFlags(rawValue: 0))
CVPixelBufferUnlockBaseAddress(rhs, CVPixelBufferLockFlags(rawValue: 0))
}
lhsData = CVPixelBufferGetBaseAddress(lhs)
rhsData = CVPixelBufferGetBaseAddress(rhs)
if lhsData == nil || rhsData == nil {
return false
}
let lhsBytesPerRow = CVPixelBufferGetBytesPerRow(lhs)
let rhsBytesPerRow = CVPixelBufferGetBytesPerRow(rhs)
let lhsDataSize = lhsBytesPerRow * lhsHeight
let rhsDataSize = rhsBytesPerRow * rhsHeight
return memcmp(lhsData, rhsData, min(lhsDataSize, rhsDataSize)) == 0
}
// Example usage:
let pixelBuffer1 = CVPixelBufferCreate(kCFAllocatorDefault, 640, 480, kCVPixelFormatType_32BGRA, nil, nil)
let pixelBuffer2 = CVPixelBufferCreate(kCFAllocatorDefault, 640, 480, kCVPixelFormatType_32BGRA, nil, nil)
// Assuming pixelBuffer1 and pixelBuffer2 are populated with data
if pixelBuffer1 == pixelBuffer2 {
print("The pixel buffers are equal.")
} else {
print("The pixel buffers are not equal.")
}
```lhsData = CVPixelBufferGetBaseAddress(lhs) // cannot assign value of type 'UnsafeMutableRawPointer?' to type 'UnsafeMutablePointer<UInt8>?'rhsData = CVPixelBufferGetBaseAddress(rhs) // cannot assign value of type 'UnsafeMutableRawPointer?' to type 'UnsafeMutablePointer<UInt8>?'import CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
var equal = true
// Compare the size of the pixel buffers
equal = equal && lhs.width == rhs.width && lhs.height == rhs.height
// Compare the pixel format of the pixel buffers
equal = equal && lhs.pixelFormatType == rhs.pixelFormatType
// Compare the content of the pixel buffers
let lhsData = CVPixelBufferGetBaseAddress(lhs)
let rhsData = CVPixelBufferGetBaseAddress(rhs)
equal = equal && memcmp(lhsData, rhsData, CVPixelBufferGetDataSize(lhs)) == 0
return equal
}```swift
import CoreVideo
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers equal in size, pixel format, and content.
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
var equal = true
// Compare the size of the pixel buffers
equal = equal && lhs.width == rhs.width && lhs.height == rhs.height
// Compare the pixel format of the pixel buffers
equal = equal && lhs.pixelFormatType == rhs.pixelFormatType
// Compare the content of the pixel buffers
let lhsData = CVPixelBufferGetBaseAddress(lhs)
let rhsData = CVPixelBufferGetBaseAddress(rhs)
equal = equal && memcmp(lhsData, rhsData, CVPixelBufferGetDataSize(lhs)) == 0
return equal
}
// Example usage:
let pixelBuffer1 = // Create a CVPixelBuffer object
let pixelBuffer2 = // Create another CVPixelBuffer object
let areEqual = pixelBuffer1 == pixelBuffer2 // Returns true if pixel buffers are equal, false otherwise
```equal = equal && lhs.width == rhs.width && lhs.height == rhs.height // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'width'equal = equal && lhs.width == rhs.width && lhs.height == rhs.height // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'width'equal = equal && lhs.width == rhs.width && lhs.height == rhs.height // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'equal = equal && lhs.width == rhs.width && lhs.height == rhs.height // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'equal = equal && lhs.pixelFormatType == rhs.pixelFormatType // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'pixelFormatType'equal = equal && lhs.pixelFormatType == rhs.pixelFormatType // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'pixelFormatType'import CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
var equal = true
// Check if the pixel buffers have the same size
equal = equal && (lhs.width == rhs.width) && (lhs.height == rhs.height)
// Check if the pixel buffers have the same pixel format
equal = equal && (lhs.pixelFormatType == rhs.pixelFormatType)
// Check if the pixel buffers have the same content
let lhsData = CVPixelBufferGetBaseAddress(lhs)
let rhsData = CVPixelBufferGetBaseAddress(rhs)
equal = equal && (memcmp(lhsData, rhsData, CVPixelBufferGetDataSize(lhs)) == 0)
return equal
}```swift
import CoreVideo
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers equal in size, pixel format, and content.
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
var equal = true
// Check if the pixel buffers have the same size
equal = equal && (lhs.width == rhs.width) && (lhs.height == rhs.height)
// Check if the pixel buffers have the same pixel format
equal = equal && (lhs.pixelFormatType == rhs.pixelFormatType)
// Check if the pixel buffers have the same content
let lhsData = CVPixelBufferGetBaseAddress(lhs)
let rhsData = CVPixelBufferGetBaseAddress(rhs)
equal = equal && (memcmp(lhsData, rhsData, CVPixelBufferGetDataSize(lhs)) == 0)
return equal
}
// Example usage:
let pixelBuffer1: CVPixelBuffer = ... // Create a CVPixelBuffer object
let pixelBuffer2: CVPixelBuffer = ... // Create another CVPixelBuffer object
let areEqual = pixelBuffer1 == pixelBuffer2
print("Are the pixel buffers equal? \(areEqual)")
```equal = equal && (lhs.width == rhs.width) && (lhs.height == rhs.height) // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'width'equal = equal && (lhs.width == rhs.width) && (lhs.height == rhs.height) // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'equal = equal && (lhs.width == rhs.width) && (lhs.height == rhs.height) // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'width'equal = equal && (lhs.width == rhs.width) && (lhs.height == rhs.height) // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'equal = equal && (lhs.pixelFormatType == rhs.pixelFormatType) // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'pixelFormatType'equal = equal && (lhs.pixelFormatType == rhs.pixelFormatType) // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'pixelFormatType'import CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
var equal: Bool = true
// Check if the pixel buffers are equal in size
equal = equal && (lhs.width == rhs.width) && (lhs.height == rhs.height)
// Check if the pixel buffers are equal in pixel format
equal = equal && (lhs.pixelFormatType == rhs.pixelFormatType)
// Check if the pixel buffers are equal in content
var lhsData: UnsafeMutableRawPointer?
var rhsData: UnsafeMutableRawPointer?
CVPixelBufferLockBaseAddress(lhs, .readOnly)
CVPixelBufferLockBaseAddress(rhs, .readOnly)
lhsData = CVPixelBufferGetBaseAddress(lhs)
rhsData = CVPixelBufferGetBaseAddress(rhs)
equal = equal && (memcmp(lhsData, rhsData, CVPixelBufferGetDataSize(lhs)) == 0)
CVPixelBufferUnlockBaseAddress(lhs, .readOnly)
CVPixelBufferUnlockBaseAddress(rhs, .readOnly)
return equal
}```swift
import CoreVideo
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers equal in size, pixel format, and content.
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
var equal: Bool = true
// Check if the pixel buffers are equal in size
equal = equal && (lhs.width == rhs.width) && (lhs.height == rhs.height)
// Check if the pixel buffers are equal in pixel format
equal = equal && (lhs.pixelFormatType == rhs.pixelFormatType)
// Check if the pixel buffers are equal in content
var lhsData: UnsafeMutableRawPointer?
var rhsData: UnsafeMutableRawPointer?
CVPixelBufferLockBaseAddress(lhs, .readOnly)
CVPixelBufferLockBaseAddress(rhs, .readOnly)
lhsData = CVPixelBufferGetBaseAddress(lhs)
rhsData = CVPixelBufferGetBaseAddress(rhs)
equal = equal && (memcmp(lhsData, rhsData, CVPixelBufferGetDataSize(lhs)) == 0)
CVPixelBufferUnlockBaseAddress(lhs, .readOnly)
CVPixelBufferUnlockBaseAddress(rhs, .readOnly)
return equal
}
```equal = equal && (lhs.width == rhs.width) && (lhs.height == rhs.height) // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'width'equal = equal && (lhs.width == rhs.width) && (lhs.height == rhs.height) // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'equal = equal && (lhs.width == rhs.width) && (lhs.height == rhs.height) // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'width'equal = equal && (lhs.width == rhs.width) && (lhs.height == rhs.height) // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'height'equal = equal && (lhs.pixelFormatType == rhs.pixelFormatType) // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'pixelFormatType'equal = equal && (lhs.pixelFormatType == rhs.pixelFormatType) // value of type 'CVPixelBuffer' (aka 'CVBuffer') has no member 'pixelFormatType'import CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
var equal: Bool = false
CVPixelBufferLockBaseAddress(lhs, .readOnly)
CVPixelBufferLockBaseAddress(rhs, .readOnly)
defer {
CVPixelBufferUnlockBaseAddress(lhs, .readOnly)
CVPixelBufferUnlockBaseAddress(rhs, .readOnly)
}
let lhsBytes = CVPixelBufferGetBaseAddress(lhs)
let rhsBytes = CVPixelBufferGetBaseAddress(rhs)
let lhsBytesPerRow = CVPixelBufferGetBytesPerRow(lhs)
let rhsBytesPerRow = CVPixelBufferGetBytesPerRow(rhs)
let lhsWidth = CVPixelBufferGetWidth(lhs)
let rhsWidth = CVPixelBufferGetWidth(rhs)
let lhsHeight = CVPixelBufferGetHeight(lhs)
let rhsHeight = CVPixelBufferGetHeight(rhs)
if lhsBytesPerRow == rhsBytesPerRow && lhsWidth == rhsWidth && lhsHeight == rhsHeight {
let lhsData = Data(bytes: lhsBytes!, count: lhsBytesPerRow * lhsHeight)
let rhsData = Data(bytes: rhsBytes!, count: rhsBytesPerRow * rhsHeight)
equal = lhsData == rhsData
}
return equal
}```swift
import CoreVideo
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers equal in size, pixel format, and content.
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
var equal: Bool = false
CVPixelBufferLockBaseAddress(lhs, .readOnly)
CVPixelBufferLockBaseAddress(rhs, .readOnly)
defer {
CVPixelBufferUnlockBaseAddress(lhs, .readOnly)
CVPixelBufferUnlockBaseAddress(rhs, .readOnly)
}
let lhsBytes = CVPixelBufferGetBaseAddress(lhs)
let rhsBytes = CVPixelBufferGetBaseAddress(rhs)
let lhsBytesPerRow = CVPixelBufferGetBytesPerRow(lhs)
let rhsBytesPerRow = CVPixelBufferGetBytesPerRow(rhs)
let lhsWidth = CVPixelBufferGetWidth(lhs)
let rhsWidth = CVPixelBufferGetWidth(rhs)
let lhsHeight = CVPixelBufferGetHeight(lhs)
let rhsHeight = CVPixelBufferGetHeight(rhs)
if lhsBytesPerRow == rhsBytesPerRow && lhsWidth == rhsWidth && lhsHeight == rhsHeight {
let lhsData = Data(bytes: lhsBytes!, count: lhsBytesPerRow * lhsHeight)
let rhsData = Data(bytes: rhsBytes!, count: rhsBytesPerRow * rhsHeight)
equal = lhsData == rhsData
}
return equal
}
// Example usage:
let pixelBuffer1: CVPixelBuffer = ... // Create a CVPixelBuffer object
let pixelBuffer2: CVPixelBuffer = ... // Create another CVPixelBuffer object
let areEqual = pixelBuffer1 == pixelBuffer2 // Returns true if pixel buffers are equal, false otherwise
```import CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
let lhsWidth = CVPixelBufferGetWidth(lhs)
let lhsHeight = CVPixelBufferGetHeight(lhs)
let lhsPixelFormat = CVPixelBufferGetPixelFormatType(lhs)
let rhsWidth = CVPixelBufferGetWidth(rhs)
let rhsHeight = CVPixelBufferGetHeight(rhs)
let rhsPixelFormat = CVPixelBufferGetPixelFormatType(rhs)
if lhsWidth != rhsWidth || lhsHeight != rhsHeight || lhsPixelFormat != rhsPixelFormat {
return false
}
let lhsData = CVPixelBufferLockBaseAddress(lhs, .readOnly)
let rhsData = CVPixelBufferLockBaseAddress(rhs, .readOnly)
defer {
CVPixelBufferUnlockBaseAddress(lhs, .readOnly)
CVPixelBufferUnlockBaseAddress(rhs, .readOnly)
}
let lhsBytesPerRow = CVPixelBufferGetBytesPerRow(lhs)
let rhsBytesPerRow = CVPixelBufferGetBytesPerRow(rhs)
let lhsDataPointer = CVPixelBufferGetBaseAddress(lhs)
let rhsDataPointer = CVPixelBufferGetBaseAddress(rhs)
let lhsDataSize = lhsBytesPerRow * lhsHeight
let rhsDataSize = rhsBytesPerRow * rhsHeight
return memcmp(lhsDataPointer, rhsDataPointer, min(lhsDataSize, rhsDataSize)) == 0
}```swift
import CoreVideo
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers equal in size, pixel format, and content.
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
let lhsWidth = CVPixelBufferGetWidth(lhs)
let lhsHeight = CVPixelBufferGetHeight(lhs)
let lhsPixelFormat = CVPixelBufferGetPixelFormatType(lhs)
let rhsWidth = CVPixelBufferGetWidth(rhs)
let rhsHeight = CVPixelBufferGetHeight(rhs)
let rhsPixelFormat = CVPixelBufferGetPixelFormatType(rhs)
if lhsWidth != rhsWidth || lhsHeight != rhsHeight || lhsPixelFormat != rhsPixelFormat {
return false
}
let lhsData = CVPixelBufferLockBaseAddress(lhs, .readOnly)
let rhsData = CVPixelBufferLockBaseAddress(rhs, .readOnly)
defer {
CVPixelBufferUnlockBaseAddress(lhs, .readOnly)
CVPixelBufferUnlockBaseAddress(rhs, .readOnly)
}
let lhsBytesPerRow = CVPixelBufferGetBytesPerRow(lhs)
let rhsBytesPerRow = CVPixelBufferGetBytesPerRow(rhs)
let lhsDataPointer = CVPixelBufferGetBaseAddress(lhs)
let rhsDataPointer = CVPixelBufferGetBaseAddress(rhs)
let lhsDataSize = lhsBytesPerRow * lhsHeight
let rhsDataSize = rhsBytesPerRow * rhsHeight
return memcmp(lhsDataPointer, rhsDataPointer, min(lhsDataSize, rhsDataSize)) == 0
}
```let lhsData = CVPixelBufferLockBaseAddress(lhs, .readOnly) // initialization of immutable value 'lhsData' was never used; consider replacing with assignment to '_' or removing itlet rhsData = CVPixelBufferLockBaseAddress(rhs, .readOnly) // initialization of immutable value 'rhsData' was never used; consider replacing with assignment to '_' or removing itimport CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
var equal: Bool = false
CVPixelBufferLockBaseAddress(lhs, .readOnly)
CVPixelBufferLockBaseAddress(rhs, .readOnly)
defer {
CVPixelBufferUnlockBaseAddress(lhs, .readOnly)
CVPixelBufferUnlockBaseAddress(rhs, .readOnly)
}
let lhsBytes = CVPixelBufferGetBaseAddress(lhs)
let rhsBytes = CVPixelBufferGetBaseAddress(rhs)
let lhsBytesPerRow = CVPixelBufferGetBytesPerRow(lhs)
let rhsBytesPerRow = CVPixelBufferGetBytesPerRow(rhs)
let lhsWidth = CVPixelBufferGetWidth(lhs)
let rhsWidth = CVPixelBufferGetWidth(rhs)
let lhsHeight = CVPixelBufferGetHeight(lhs)
let rhsHeight = CVPixelBufferGetHeight(rhs)
let lhsPixelFormat = CVPixelBufferGetPixelFormatType(lhs)
let rhsPixelFormat = CVPixelBufferGetPixelFormatType(rhs)
if lhsWidth == rhsWidth && lhsHeight == rhsHeight && lhsPixelFormat == rhsPixelFormat {
let lhsData = Data(bytes: lhsBytes!, count: lhsWidth * lhsHeight * lhsBytesPerRow)
let rhsData = Data(bytes: rhsBytes!, count: rhsWidth * rhsHeight * rhsBytesPerRow)
equal = lhsData == rhsData
}
return equal
}```swift
import CoreVideo
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers equal in size, pixel format, and content.
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
var equal: Bool = false
CVPixelBufferLockBaseAddress(lhs, .readOnly)
CVPixelBufferLockBaseAddress(rhs, .readOnly)
defer {
CVPixelBufferUnlockBaseAddress(lhs, .readOnly)
CVPixelBufferUnlockBaseAddress(rhs, .readOnly)
}
let lhsBytes = CVPixelBufferGetBaseAddress(lhs)
let rhsBytes = CVPixelBufferGetBaseAddress(rhs)
let lhsBytesPerRow = CVPixelBufferGetBytesPerRow(lhs)
let rhsBytesPerRow = CVPixelBufferGetBytesPerRow(rhs)
let lhsWidth = CVPixelBufferGetWidth(lhs)
let rhsWidth = CVPixelBufferGetWidth(rhs)
let lhsHeight = CVPixelBufferGetHeight(lhs)
let rhsHeight = CVPixelBufferGetHeight(rhs)
let lhsPixelFormat = CVPixelBufferGetPixelFormatType(lhs)
let rhsPixelFormat = CVPixelBufferGetPixelFormatType(rhs)
if lhsWidth == rhsWidth && lhsHeight == rhsHeight && lhsPixelFormat == rhsPixelFormat {
let lhsData = Data(bytes: lhsBytes!, count: lhsWidth * lhsHeight * lhsBytesPerRow)
let rhsData = Data(bytes: rhsBytes!, count: rhsWidth * rhsHeight * rhsBytesPerRow)
equal = lhsData == rhsData
}
return equal
}
``` // XCTAssertTrue failedimport CoreVideo
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
var equal: Bool = false
CVPixelBufferLockBaseAddress(lhs, .readOnly)
CVPixelBufferLockBaseAddress(rhs, .readOnly)
defer {
CVPixelBufferUnlockBaseAddress(lhs, .readOnly)
CVPixelBufferUnlockBaseAddress(rhs, .readOnly)
}
if CVPixelBufferGetPixelFormatType(lhs) == CVPixelBufferGetPixelFormatType(rhs) &&
CVPixelBufferGetWidth(lhs) == CVPixelBufferGetWidth(rhs) &&
CVPixelBufferGetHeight(lhs) == CVPixelBufferGetHeight(rhs) {
let lhsBytes = CVPixelBufferGetBaseAddress(lhs)
let rhsBytes = CVPixelBufferGetBaseAddress(rhs)
let lhsBytesPerRow = CVPixelBufferGetBytesPerRow(lhs)
let rhsBytesPerRow = CVPixelBufferGetBytesPerRow(rhs)
let lhsWidth = CVPixelBufferGetWidth(lhs)
let lhsHeight = CVPixelBufferGetHeight(lhs)
for y in 0..<lhsHeight {
let lhsRow = lhsBytes.advanced(by: y * lhsBytesPerRow)
let rhsRow = rhsBytes.advanced(by: y * rhsBytesPerRow)
for x in 0..<lhsWidth {
let lhsPixel = lhsRow.advanced(by: x * 4)
let rhsPixel = rhsRow.advanced(by: x * 4)
if lhsPixel[0] != rhsPixel[0] || lhsPixel[1] != rhsPixel[1] || lhsPixel[2] != rhsPixel[2] || lhsPixel[3] != rhsPixel[3] {
equal = false
break
}
equal = true
}
}
}
return equal
}```swift
import CoreVideo
// Custom operator which provides comparison for two CVPixelBuffer objects and returns true if two pixel buffers equal in size, pixel format, and content.
func ==(lhs: CVPixelBuffer, rhs: CVPixelBuffer) -> Bool {
var equal: Bool = false
CVPixelBufferLockBaseAddress(lhs, .readOnly)
CVPixelBufferLockBaseAddress(rhs, .readOnly)
defer {
CVPixelBufferUnlockBaseAddress(lhs, .readOnly)
CVPixelBufferUnlockBaseAddress(rhs, .readOnly)
}
if CVPixelBufferGetPixelFormatType(lhs) == CVPixelBufferGetPixelFormatType(rhs) &&
CVPixelBufferGetWidth(lhs) == CVPixelBufferGetWidth(rhs) &&
CVPixelBufferGetHeight(lhs) == CVPixelBufferGetHeight(rhs) {
let lhsBytes = CVPixelBufferGetBaseAddress(lhs)
let rhsBytes = CVPixelBufferGetBaseAddress(rhs)
let lhsBytesPerRow = CVPixelBufferGetBytesPerRow(lhs)
let rhsBytesPerRow = CVPixelBufferGetBytesPerRow(rhs)
let lhsWidth = CVPixelBufferGetWidth(lhs)
let lhsHeight = CVPixelBufferGetHeight(lhs)
for y in 0..<lhsHeight {
let lhsRow = lhsBytes.advanced(by: y * lhsBytesPerRow)
let rhsRow = rhsBytes.advanced(by: y * rhsBytesPerRow)
for x in 0..<lhsWidth {
let lhsPixel = lhsRow.advanced(by: x * 4)
let rhsPixel = rhsRow.advanced(by: x * 4)
if lhsPixel[0] != rhsPixel[0] || lhsPixel[1] != rhsPixel[1] || lhsPixel[2] != rhsPixel[2] || lhsPixel[3] != rhsPixel[3] {
equal = false
break
}
equal = true
}
}
}
return equal
}
// Example usage:
let pixelBuffer1 = // Create a CVPixelBuffer object
let pixelBuffer2 = // Create another CVPixelBuffer object
if pixelBuffer1 == pixelBuffer2 {
print("The pixel buffers are equal.")
} else {
print("The pixel buffers are not equal.")
}
```let lhsRow = lhsBytes.advanced(by: y * lhsBytesPerRow) // value of optional type 'UnsafeMutableRawPointer?' must be unwrapped to refer to member 'advanced' of wrapped base type 'UnsafeMutableRawPointer'let rhsRow = rhsBytes.advanced(by: y * rhsBytesPerRow) // value of optional type 'UnsafeMutableRawPointer?' must be unwrapped to refer to member 'advanced' of wrapped base type 'UnsafeMutableRawPointer'struct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] {
return items.map { item in
return PublicItem(value: item.value)
}
}```swift
struct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
// Function to convert an array of structs with private integer fields into an array of public structs with identical integer fields by directly reinterpreting memory, assuming the structs have the same memory layout and alignment.
func reveal(items: [PrivateItem]) -> [PublicItem] {
return items.map { item in
return PublicItem(value: item.value)
}
}
// Example usage:
let privateItems: [PrivateItem] = [PrivateItem(value: 1), PrivateItem(value: 2), PrivateItem(value: 3)]
let publicItems = reveal(items: privateItems)
publicItems.forEach { print($0.value) } // Output: 1, 2, 3
```return PublicItem(value: item.value) // 'value' is inaccessible due to 'private' protection levelstruct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] {
return items.map { item in
return PublicItem(value: item.value)
}
}```swift
struct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
// Function to convert an array of structs with private integer fields into an array of public structs with identical integer fields by directly reinterpreting memory, assuming the structs have the same memory layout and alignment.
func reveal(items: [PrivateItem]) -> [PublicItem] {
return items.map { item in
return PublicItem(value: item.value)
}
}
// Example usage:
let privateItems: [PrivateItem] = [PrivateItem(value: 1), PrivateItem(value: 2), PrivateItem(value: 3)]
let publicItems = reveal(items: privateItems)
print(publicItems) // Output: [PublicItem(value: 1), PublicItem(value: 2), PublicItem(value: 3)]
```return PublicItem(value: item.value) // 'value' is inaccessible due to 'private' protection levelstruct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] {
return items.map { item in
return PublicItem(value: item.value)
}
}```swift
struct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
// Function to convert an array of structs with private integer fields into an array of public structs with identical integer fields by directly reinterpreting memory, assuming the structs have the same memory layout and alignment.
func reveal(items: [PrivateItem]) -> [PublicItem] {
return items.map { item in
return PublicItem(value: item.value)
}
}
// Example usage:
let privateItems = [PrivateItem(value: 1), PrivateItem(value: 2), PrivateItem(value: 3)]
let publicItems = reveal(items: privateItems)
print(publicItems) // Output: [PublicItem(value: 1), PublicItem(value: 2), PublicItem(value: 3)]
```return PublicItem(value: item.value) // 'value' is inaccessible due to 'private' protection levelstruct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] {
let count = items.count
let size = MemoryLayout<PrivateItem>.stride * count
let buffer = UnsafeMutableBufferPointer<PrivateItem>.allocate(capacity: count)
buffer.initialize(from: items)
let publicItems = buffer.map { PublicItem(value: $0.value) }
buffer.deallocate()
return publicItems
}```swift
struct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
// Function to convert an array of structs with private integer fields into an array of public structs with identical integer fields by directly reinterpreting memory, assuming the structs have the same memory layout and alignment.
func reveal(items: [PrivateItem]) -> [PublicItem] {
let count = items.count
let size = MemoryLayout<PrivateItem>.stride * count
let buffer = UnsafeMutableBufferPointer<PrivateItem>.allocate(capacity: count)
buffer.initialize(from: items)
let publicItems = buffer.map { PublicItem(value: $0.value) }
buffer.deallocate()
return publicItems
}
// Example usage:
let privateItems = [PrivateItem(value: 1), PrivateItem(value: 2), PrivateItem(value: 3)]
let publicItems = reveal(items: privateItems)
print(publicItems) // Output: [PublicItem(value: 1), PublicItem(value: 2), PublicItem(value: 3)]
```buffer.initialize(from: items) // result of call to 'initialize(from:)' is unusedlet publicItems = buffer.map { PublicItem(value: $0.value) } // 'value' is inaccessible due to 'private' protection levelstruct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] {
return items.map { item in
return PublicItem(value: item.value)
}
}```swift
struct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
// Function to convert an array of structs with private integer fields into an array of public structs with identical integer fields by directly reinterpreting memory, assuming the structs have the same memory layout and alignment.
func reveal(items: [PrivateItem]) -> [PublicItem] {
return items.map { item in
return PublicItem(value: item.value)
}
}
// Example usage:
let privateItems: [PrivateItem] = [PrivateItem(value: 1), PrivateItem(value: 2), PrivateItem(value: 3)]
let publicItems = reveal(items: privateItems)
print(publicItems) // Output: [PublicItem(value: 1), PublicItem(value: 2), PublicItem(value: 3)]
```return PublicItem(value: item.value) // 'value' is inaccessible due to 'private' protection levelstruct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] {
let count = items.count
let size = MemoryLayout<PrivateItem>.stride * count
let buffer = UnsafeMutableRawBufferPointer.allocate(byteCount: size, alignment: MemoryLayout<PrivateItem>.alignment)
defer { buffer.deallocate() }
// Copy the memory from the private structs to the buffer
for (index, item) in items.enumerated() {
let offset = index * MemoryLayout<PrivateItem>.stride
let source = UnsafeRawPointer(Unmanaged.passUnretained(item).toOpaque())
let destination = buffer.baseAddress!.advanced(by: offset)
memcpy(destination, source, MemoryLayout<PrivateItem>.stride)
}
// Convert the buffer to an array of public structs
let publicItems = buffer.bindMemory(to: PublicItem.self, capacity: count)
return Array(publicItems)
}```swift
struct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
// Function to convert an array of structs with private integer fields into an array of public structs with identical integer fields by directly reinterpreting memory, assuming the structs have the same memory layout and alignment.
func reveal(items: [PrivateItem]) -> [PublicItem] {
let count = items.count
let size = MemoryLayout<PrivateItem>.stride * count
let buffer = UnsafeMutableRawBufferPointer.allocate(byteCount: size, alignment: MemoryLayout<PrivateItem>.alignment)
defer { buffer.deallocate() }
// Copy the memory from the private structs to the buffer
for (index, item) in items.enumerated() {
let offset = index * MemoryLayout<PrivateItem>.stride
let source = UnsafeRawPointer(Unmanaged.passUnretained(item).toOpaque())
let destination = buffer.baseAddress!.advanced(by: offset)
memcpy(destination, source, MemoryLayout<PrivateItem>.stride)
}
// Convert the buffer to an array of public structs
let publicItems = buffer.bindMemory(to: PublicItem.self, capacity: count)
return Array(publicItems)
}
// Example usage:
let privateItems = [PrivateItem(value: 1), PrivateItem(value: 2), PrivateItem(value: 3)]
let publicItems = reveal(items: privateItems)
print(publicItems) // Output: [PublicItem(value: 1), PublicItem(value: 2), PublicItem(value: 3)]
```let source = UnsafeRawPointer(Unmanaged.passUnretained(item).toOpaque()) // generic struct 'Unmanaged' requires that 'PrivateItem' be a class typelet source = UnsafeRawPointer(Unmanaged.passUnretained(item).toOpaque()) // generic struct 'Unmanaged' requires that 'PrivateItem' be a class typelet source = UnsafeRawPointer(Unmanaged.passUnretained(item).toOpaque()) // generic struct 'Unmanaged' requires that 'PrivateItem' be a class typelet publicItems = buffer.bindMemory(to: PublicItem.self, capacity: count) // extra argument 'capacity' in callstruct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] {
return items.map { item in
return PublicItem(value: item.value)
}
}```swift
struct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
// Function to convert an array of structs with private integer fields into an array of public structs with identical integer fields by directly reinterpreting memory, assuming the structs have the same memory layout and alignment.
func reveal(items: [PrivateItem]) -> [PublicItem] {
return items.map { item in
return PublicItem(value: item.value)
}
}
// Example usage:
let privateItems: [PrivateItem] = [PrivateItem(value: 1), PrivateItem(value: 2), PrivateItem(value: 3)]
let publicItems = reveal(items: privateItems)
print(publicItems) // Output: [PublicItem(value: 1), PublicItem(value: 2), PublicItem(value: 3)]
```return PublicItem(value: item.value) // 'value' is inaccessible due to 'private' protection levelstruct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] {
return items.map { item in
PublicItem(value: item.value)
}
}```swift
struct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
// Function to convert an array of structs with private integer fields into an array of public structs with identical integer fields by directly reinterpreting memory, assuming the structs have the same memory layout and alignment.
func reveal(items: [PrivateItem]) -> [PublicItem] {
return items.map { item in
PublicItem(value: item.value)
}
}
// Example usage:
let privateItems = [PrivateItem(value: 1), PrivateItem(value: 2), PrivateItem(value: 3)]
let publicItems = reveal(items: privateItems)
publicItems.forEach { print($0.value) } // Output: 1, 2, 3
```PublicItem(value: item.value) // 'value' is inaccessible due to 'private' protection levelstruct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] {
return items.map { item in
PublicItem(value: item.value)
}
}```swift
struct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
// Function to convert an array of structs with private integer fields into an array of public structs with identical integer fields by directly reinterpreting memory, assuming the structs have the same memory layout and alignment.
func reveal(items: [PrivateItem]) -> [PublicItem] {
return items.map { item in
PublicItem(value: item.value)
}
}
// Example usage:
let privateItems = [PrivateItem(value: 1), PrivateItem(value: 2), PrivateItem(value: 3)]
let publicItems = reveal(items: privateItems)
publicItems.forEach { item in
print(item.value) // Output: 1, 2, 3
}
```PublicItem(value: item.value) // 'value' is inaccessible due to 'private' protection levelstruct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
func reveal(items: [PrivateItem]) -> [PublicItem] {
return items.map { PublicItem(value: $0.value) }
}```swift
struct PrivateItem {
private let value: Int
init(value: Int) {
self.value = value
}
}
struct PublicItem {
let value: Int
}
// Function to convert an array of structs with private integer fields into an array of public structs with identical integer fields by directly reinterpreting memory, assuming the structs have the same memory layout and alignment.
func reveal(items: [PrivateItem]) -> [PublicItem] {
return items.map { PublicItem(value: $0.value) }
}
// Example usage:
let privateItems = [PrivateItem(value: 1), PrivateItem(value: 2), PrivateItem(value: 3)]
let publicItems = reveal(items: privateItems)
publicItems.forEach { print($0.value) } // Output: 1, 2, 3
```return items.map { PublicItem(value: $0.value) } // 'value' is inaccessible due to 'private' protection levelenum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
let versionComponents = { (version: String) -> [String] in
return version.components(separatedBy: ".")
}
let lhsComponents = versionComponents(lhs)
let rhsComponents = versionComponents(rhs)
let maxLength = max(lhsComponents.count, rhsComponents.count)
for i in 0..<maxLength {
let lhsComponent = i < lhsComponents.count ? lhsComponents[i] : "0"
let rhsComponent = i < rhsComponents.count ? rhsComponents[i] : "0"
if lhsComponent != rhsComponent {
let lhsNumeric = Int(lhsComponent.replacingOccurrences(of: "alpha", with: "0").replacingOccurrences(of: "beta", with: "1")) ?? 0
let rhsNumeric = Int(rhsComponent.replacingOccurrences(of: "alpha", with: "0").replacingOccurrences(of: "beta", with: "1")) ?? 0
if lhsNumeric < rhsNumeric {
return .orderedAscending
} else {
return .orderedDescending
}
}
}
return .orderedSame
}
func main() {
let testCases = [
("1.2.3", "1.2.3", .orderedSame),
("1.2.3", "1.2.4", .orderedAscending),
("1.2.3", "1.2.2", .orderedDescending),
("1.2.3alpha", "1.2.3", .orderedDescending),
("1.2.3beta", "1.2.3", .orderedAscending),
("1.2.3", "1.2.3alpha", .orderedDescending),
("1.2.3", "1.2.3beta", .orderedAscending),
("1.2.3alpha", "1.2.3beta", .orderedAscending),
("1.2.3beta", "1.2.3alpha", .orderedDescending)
]
for (lhs, rhs, expected) in testCases {
let result = compareVersions(lhs, rhs)
assert(result == expected, "Test failed for comparison: \(lhs) vs \(rhs)")
print("Test passed for comparison: \(lhs) vs \(rhs)")
}
}```swift
enum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
let versionComponents = { (version: String) -> [String] in
return version.components(separatedBy: ".")
}
let lhsComponents = versionComponents(lhs)
let rhsComponents = versionComponents(rhs)
let maxLength = max(lhsComponents.count, rhsComponents.count)
for i in 0..<maxLength {
let lhsComponent = i < lhsComponents.count ? lhsComponents[i] : "0"
let rhsComponent = i < rhsComponents.count ? rhsComponents[i] : "0"
if lhsComponent != rhsComponent {
let lhsNumeric = Int(lhsComponent.replacingOccurrences(of: "alpha", with: "0").replacingOccurrences(of: "beta", with: "1")) ?? 0
let rhsNumeric = Int(rhsComponent.replacingOccurrences(of: "alpha", with: "0").replacingOccurrences(of: "beta", with: "1")) ?? 0
if lhsNumeric < rhsNumeric {
return .orderedAscending
} else {
return .orderedDescending
}
}
}
return .orderedSame
}
// Main function to test the compareVersions function
func main() {
let testCases = [
("1.2.3", "1.2.3", .orderedSame),
("1.2.3", "1.2.4", .orderedAscending),
("1.2.3", "1.2.2", .orderedDescending),
("1.2.3alpha", "1.2.3", .orderedDescending),
("1.2.3beta", "1.2.3", .orderedAscending),
("1.2.3", "1.2.3alpha", .orderedDescending),
("1.2.3", "1.2.3beta", .orderedAscending),
("1.2.3alpha", "1.2.3beta", .orderedAscending),
("1.2.3beta", "1.2.3alpha", .orderedDescending)
]
for (lhs, rhs, expected) in testCases {
let result = compareVersions(lhs, rhs)
assert(result == expected, "Test failed for comparison: \(lhs) vs \(rhs)")
print("Test passed for comparison: \(lhs) vs \(rhs)")
}
}
main()
```("1.2.3", "1.2.3", .orderedSame), // cannot infer contextual base in reference to member 'orderedSame'("1.2.3", "1.2.4", .orderedAscending), // cannot infer contextual base in reference to member 'orderedAscending'("1.2.3", "1.2.2", .orderedDescending), // cannot infer contextual base in reference to member 'orderedDescending'("1.2.3alpha", "1.2.3", .orderedDescending), // cannot infer contextual base in reference to member 'orderedDescending'("1.2.3beta", "1.2.3", .orderedAscending), // cannot infer contextual base in reference to member 'orderedAscending'("1.2.3", "1.2.3alpha", .orderedDescending), // cannot infer contextual base in reference to member 'orderedDescending'("1.2.3", "1.2.3beta", .orderedAscending), // cannot infer contextual base in reference to member 'orderedAscending'("1.2.3alpha", "1.2.3beta", .orderedAscending), // cannot infer contextual base in reference to member 'orderedAscending'("1.2.3beta", "1.2.3alpha", .orderedDescending) // cannot infer contextual base in reference to member 'orderedDescending'enum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
let lhsComponents = lhs.split(separator: ".").map { String($0) }
let rhsComponents = rhs.split(separator: ".").map { String($0) }
let maxLength = max(lhsComponents.count, rhsComponents.count)
for i in 0..<maxLength {
let lhsComponent = i < lhsComponents.count ? lhsComponents[i] : "0"
let rhsComponent = i < rhsComponents.count ? rhsComponents[i] : "0"
if lhsComponent != rhsComponent {
if lhsComponent.hasSuffix("alpha") || rhsComponent.hasSuffix("beta") {
return .orderedAscending
} else if lhsComponent.hasSuffix("beta") || rhsComponent.hasSuffix("alpha") {
return .orderedDescending
} else {
let lhsNumber = Int(lhsComponent.replacingOccurrences(of: "alpha", with: "").replacingOccurrences(of: "beta", with: "")) ?? 0
let rhsNumber = Int(rhsComponent.replacingOccurrences(of: "alpha", with: "").replacingOccurrences(of: "beta", with: "")) ?? 0
if lhsNumber < rhsNumber {
return .orderedAscending
} else if lhsNumber > rhsNumber {
return .orderedDescending
}
}
}
}
return .orderedSame
}
func main() {
let testCases = [
("1.2.3", "1.2.3", .orderedSame),
("1.2.3alpha", "1.2.3", .orderedAscending),
("1.2.3", "1.2.3alpha", .orderedDescending),
("1.2.3beta", "1.2.3alpha", .orderedDescending),
("1.2.3alpha", "1.2.3beta", .orderedAscending),
("1.2.3", "1.2.4", .orderedAscending),
("1.2.4", "1.2.3", .orderedDescending),
("1.3.0", "1.2.4", .orderedAscending),
("1.2.4", "1.3.0", .orderedDescending),
("1.2.3", "1.2.3.4", .orderedAscending),
("1.2.3.4", "1.2.3", .orderedDescending),
("1.2.3.4", "1.2.3.5", .orderedAscending),
("1.2.3.5", "1.2.3.4", .orderedDescending),
]
for (lhs, rhs, expected) in testCases {
let result = compareVersions(lhs, rhs)
assert(result == expected, "Test failed for comparison \(lhs) and \(rhs). Expected \(expected), got \(result).")
}
print("All tests passed!")
}```swift
enum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
let lhsComponents = lhs.split(separator: ".").map { String($0) }
let rhsComponents = rhs.split(separator: ".").map { String($0) }
let maxLength = max(lhsComponents.count, rhsComponents.count)
for i in 0..<maxLength {
let lhsComponent = i < lhsComponents.count ? lhsComponents[i] : "0"
let rhsComponent = i < rhsComponents.count ? rhsComponents[i] : "0"
if lhsComponent != rhsComponent {
if lhsComponent.hasSuffix("alpha") || rhsComponent.hasSuffix("beta") {
return .orderedAscending
} else if lhsComponent.hasSuffix("beta") || rhsComponent.hasSuffix("alpha") {
return .orderedDescending
} else {
let lhsNumber = Int(lhsComponent.replacingOccurrences(of: "alpha", with: "").replacingOccurrences(of: "beta", with: "")) ?? 0
let rhsNumber = Int(rhsComponent.replacingOccurrences(of: "alpha", with: "").replacingOccurrences(of: "beta", with: "")) ?? 0
if lhsNumber < rhsNumber {
return .orderedAscending
} else if lhsNumber > rhsNumber {
return .orderedDescending
}
}
}
}
return .orderedSame
}
// Main function to test the compareVersions function
func main() {
let testCases = [
("1.2.3", "1.2.3", .orderedSame),
("1.2.3alpha", "1.2.3", .orderedAscending),
("1.2.3", "1.2.3alpha", .orderedDescending),
("1.2.3beta", "1.2.3alpha", .orderedDescending),
("1.2.3alpha", "1.2.3beta", .orderedAscending),
("1.2.3", "1.2.4", .orderedAscending),
("1.2.4", "1.2.3", .orderedDescending),
("1.3.0", "1.2.4", .orderedAscending),
("1.2.4", "1.3.0", .orderedDescending),
("1.2.3", "1.2.3.4", .orderedAscending),
("1.2.3.4", "1.2.3", .orderedDescending),
("1.2.3.4", "1.2.3.5", .orderedAscending),
("1.2.3.5", "1.2.3.4", .orderedDescending),
]
for (lhs, rhs, expected) in testCases {
let result = compareVersions(lhs, rhs)
assert(result == expected, "Test failed for comparison \(lhs) and \(rhs). Expected \(expected), got \(result).")
}
print("All tests passed!")
}
main()
```("1.2.3", "1.2.3", .orderedSame), // cannot infer contextual base in reference to member 'orderedSame'("1.2.3alpha", "1.2.3", .orderedAscending), // cannot infer contextual base in reference to member 'orderedAscending'("1.2.3", "1.2.3alpha", .orderedDescending), // cannot infer contextual base in reference to member 'orderedDescending'("1.2.3beta", "1.2.3alpha", .orderedDescending), // cannot infer contextual base in reference to member 'orderedDescending'("1.2.3alpha", "1.2.3beta", .orderedAscending), // cannot infer contextual base in reference to member 'orderedAscending'("1.2.3", "1.2.4", .orderedAscending), // cannot infer contextual base in reference to member 'orderedAscending'("1.2.4", "1.2.3", .orderedDescending), // cannot infer contextual base in reference to member 'orderedDescending'("1.3.0", "1.2.4", .orderedAscending), // cannot infer contextual base in reference to member 'orderedAscending'("1.2.4", "1.3.0", .orderedDescending), // cannot infer contextual base in reference to member 'orderedDescending'("1.2.3", "1.2.3.4", .orderedAscending), // cannot infer contextual base in reference to member 'orderedAscending'("1.2.3.4", "1.2.3", .orderedDescending), // cannot infer contextual base in reference to member 'orderedDescending'("1.2.3.4", "1.2.3.5", .orderedAscending), // cannot infer contextual base in reference to member 'orderedAscending'("1.2.3.5", "1.2.3.4", .orderedDescending), // cannot infer contextual base in reference to member 'orderedDescending'enum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
let versionComponents = { (version: String) -> [String] in
return version.components(separatedBy: ".")
}
let lhsComponents = versionComponents(lhs)
let rhsComponents = versionComponents(rhs)
let maxLength = max(lhsComponents.count, rhsComponents.count)
for i in 0..<maxLength {
let lhsComponent = i < lhsComponents.count ? lhsComponents[i] : "0"
let rhsComponent = i < rhsComponents.count ? rhsComponents[i] : "0"
if lhsComponent == rhsComponent {
continue
}
if let lhsNumber = Int(lhsComponent), let rhsNumber = Int(rhsComponent) {
if lhsNumber < rhsNumber {
return .orderedAscending
} else {
return .orderedDescending
}
} else {
if lhsComponent.contains("alpha") {
if !rhsComponent.contains("alpha") {
return .orderedDescending
}
} else if lhsComponent.contains("beta") {
if !rhsComponent.contains("beta") {
return .orderedDescending
}
} else if rhsComponent.contains("alpha") {
return .orderedAscending
} else if rhsComponent.contains("beta") {
return .orderedAscending
}
}
}
return .orderedSame
}```swift
enum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
let versionComponents = { (version: String) -> [String] in
return version.components(separatedBy: ".")
}
let lhsComponents = versionComponents(lhs)
let rhsComponents = versionComponents(rhs)
let maxLength = max(lhsComponents.count, rhsComponents.count)
for i in 0..<maxLength {
let lhsComponent = i < lhsComponents.count ? lhsComponents[i] : "0"
let rhsComponent = i < rhsComponents.count ? rhsComponents[i] : "0"
if lhsComponent == rhsComponent {
continue
}
if let lhsNumber = Int(lhsComponent), let rhsNumber = Int(rhsComponent) {
if lhsNumber < rhsNumber {
return .orderedAscending
} else {
return .orderedDescending
}
} else {
if lhsComponent.contains("alpha") {
if !rhsComponent.contains("alpha") {
return .orderedDescending
}
} else if lhsComponent.contains("beta") {
if !rhsComponent.contains("beta") {
return .orderedDescending
}
} else if rhsComponent.contains("alpha") {
return .orderedAscending
} else if rhsComponent.contains("beta") {
return .orderedAscending
}
}
}
return .orderedSame
}
// Unit tests for the compareVersions function
func testCompareVersions() {
assert(compareVersions("1.0.0", "1.0.0") == .orderedSame, "1.0.0 should be equal to 1.0.0")
assert(compareVersions("1.0.0", "1.0.1") == .orderedAscending, "1.0.0 should be less than 1.0.1")
assert(compareVersions("1.0.1", "1.0.0") == .orderedDescending, "1.0.1 should be greater than 1.0.0")
assert(compareVersions("1.0.0-alpha", "1.0.0") == .orderedAscending, "1.0.0-alpha should be less than 1.0.0")
assert(compareVersions("1.0.0", "1.0.0-beta") == .orderedDescending, "1.0.0 should be greater than 1.0.0-beta")
assert(compareVersions("1.0.0-alpha", "1.0.0-beta") == .orderedAscending, "1.0.0-alpha should be less than 1.0.0-beta")
assert(compareVersions("1.0.0-beta", "1.0.0-alpha") == .orderedDescending, "1.0.0-beta should be greater than 1.0.0-alpha")
assert(compareVersions("1.0.0-alpha.1", "1.0.0-alpha.2") == .orderedAscending, "1.0.0-alpha.1 should be less than 1.0.0-alpha.2")
assert(compareVersions("1.0.0-alpha.2", "1.0.0-alpha.1") == .orderedDescending, "1.0.0-alpha.2 should be greater than 1.0.0-alpha.1")
assert(compareVersions("1.0.0-alpha.1", "1.0.0-beta.1") == .orderedAscending, "1.0.0-alpha.1 should be less than 1.0.0-beta.1")
assert(compareVersions("1.0.0-beta.1", "1.0.0-alpha.1") == .orderedDescending, "1.0.0-beta.1 should be greater than 1.0.0-alpha.1")
assert(compareVersions("1.0.0-alpha.1", "1.0.0-alpha.1") == .orderedSame, "1.0.0-alpha.1 should be // XCTAssertTrue failedenum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
let lhsComponents = lhs.split(separator: ".").map { String($0) }
let rhsComponents = rhs.split(separator: ".").map { String($0) }
let maxLength = max(lhsComponents.count, rhsComponents.count)
for i in 0..<maxLength {
let lhsComponent = i < lhsComponents.count ? lhsComponents[i] : "0"
let rhsComponent = i < rhsComponents.count ? rhsComponents[i] : "0"
if lhsComponent == rhsComponent {
continue
}
if lhsComponent.hasSuffix("alpha") || rhsComponent.hasSuffix("alpha") {
if lhsComponent.hasSuffix("alpha") && !rhsComponent.hasSuffix("alpha") {
return .orderedAscending
} else if !lhsComponent.hasSuffix("alpha") && rhsComponent.hasSuffix("alpha") {
return .orderedDescending
} else {
let strippedLhs = String(lhsComponent.dropLast(5))
let strippedRhs = String(rhsComponent.dropLast(5))
if let lhsNum = Int(strippedLhs), let rhsNum = Int(strippedRhs) {
if lhsNum < rhsNum {
return .orderedAscending
} else if lhsNum > rhsNum {
return .orderedDescending
}
}
}
} else if lhsComponent.hasSuffix("beta") || rhsComponent.hasSuffix("beta") {
if lhsComponent.hasSuffix("beta") && !rhsComponent.hasSuffix("beta") {
return .orderedAscending
} else if !lhsComponent.hasSuffix("beta") && rhsComponent.hasSuffix("beta") {
return .orderedDescending
} else {
let strippedLhs = String(lhsComponent.dropLast(4))
let strippedRhs = String(rhsComponent.dropLast(4))
if let lhsNum = Int(strippedLhs), let rhsNum = Int(strippedRhs) {
if lhsNum < rhsNum {
return .orderedAscending
} else if lhsNum > rhsNum {
return .orderedDescending
}
}
}
} else {
if let lhsNum = Int(lhsComponent), let rhsNum = Int(rhsComponent) {
if lhsNum < rhsNum {
return .orderedAscending
} else if lhsNum > rhsNum {
return .orderedDescending
}
}
}
}
return .orderedSame
}```swift
enum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
let lhsComponents = lhs.split(separator: ".").map { String($0) }
let rhsComponents = rhs.split(separator: ".").map { String($0) }
let maxLength = max(lhsComponents.count, rhsComponents.count)
for i in 0..<maxLength {
let lhsComponent = i < lhsComponents.count ? lhsComponents[i] : "0"
let rhsComponent = i < rhsComponents.count ? rhsComponents[i] : "0"
if lhsComponent == rhsComponent {
continue
}
if lhsComponent.hasSuffix("alpha") || rhsComponent.hasSuffix("alpha") {
if lhsComponent.hasSuffix("alpha") && !rhsComponent.hasSuffix("alpha") {
return .orderedAscending
} else if !lhsComponent.hasSuffix("alpha") && rhsComponent.hasSuffix("alpha") {
return .orderedDescending
} else {
let strippedLhs = String(lhsComponent.dropLast(5))
let strippedRhs = String(rhsComponent.dropLast(5))
if let lhsNum = Int(strippedLhs), let rhsNum = Int(strippedRhs) {
if lhsNum < rhsNum {
return .orderedAscending
} else if lhsNum > rhsNum {
return .orderedDescending
}
}
}
} else if lhsComponent.hasSuffix("beta") || rhsComponent.hasSuffix("beta") {
if lhsComponent.hasSuffix("beta") && !rhsComponent.hasSuffix("beta") {
return .orderedAscending
} else if !lhsComponent.hasSuffix("beta") && rhsComponent.hasSuffix("beta") {
return .orderedDescending
} else {
let strippedLhs = String(lhsComponent.dropLast(4))
let strippedRhs = String(rhsComponent.dropLast(4))
if let lhsNum = Int(strippedLhs), let rhsNum = Int(strippedRhs) {
if lhsNum < rhsNum {
return .orderedAscending
} else if lhsNum > rhsNum {
return .orderedDescending
}
}
}
} else {
if let lhsNum = Int(lhsComponent), let rhsNum = Int(rhsComponent) {
if lhsNum < rhsNum {
return .orderedAscending
} else if lhsNum > rhsNum {
return .orderedDescending
}
}
}
}
return .orderedSame
}
// Main function to test the compareVersions function
func main() {
let testCases = [
("1.0.0", "2.0.0", .orderedAscending),
("1.0.0", "1.0.0", .orderedSame),
("1.0.0", "0.9.9", .orderedDescending),
("1.0.0-alpha.1", "1.0.0", .orderedDescending),
("1.0.0-alpha.1", "1.0.0-alpha.2", .orderedAscending),
("1.0.0-beta.1", "1.0.0-alpha.1", .orderedDescending),
("1.0.0-alpha.1", "1.0.0-beta.1", .orderedAscending),
("1.0.0-alpha.1", "1.0.0-alpha.1", .orderedSame),
("1.0.0-alpha.1", "1.0.0-alpha.1.2", .orderedAscending),
("1.0.0-alpha.1.2", "1.0.0-alpha.1", .orderedDescending)
]
for (lhs, rhs, expected) in testCases {
let result = compareVersions(lhs, rhs)
assert(enum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
let lhsComponents = lhs.components(separatedBy: ".")
let rhsComponents = rhs.components(separatedBy: ".")
for i in 0..<max(lhsComponents.count, rhsComponents.count) {
let lhsComponent = lhsComponents.indices.contains(i) ? lhsComponents[i] : "0"
let rhsComponent = rhsComponents.indices.contains(i) ? rhsComponents[i] : "0"
if lhsComponent != rhsComponent {
if lhsComponent.hasSuffix("alpha") || rhsComponent.hasSuffix("beta") {
return .orderedAscending
} else if lhsComponent.hasSuffix("beta") || rhsComponent.hasSuffix("alpha") {
return .orderedDescending
} else {
let lhsNum = Int(lhsComponent.replacingOccurrences(of: "alpha", with: "").replacingOccurrences(of: "beta", with: "")) ?? 0
let rhsNum = Int(rhsComponent.replacingOccurrences(of: "alpha", with: "").replacingOccurrences(of: "beta", with: "")) ?? 0
if lhsNum < rhsNum {
return .orderedAscending
} else if lhsNum > rhsNum {
return .orderedDescending
}
}
}
}
return .orderedSame
}
func testCompareVersions() {
assert(compareVersions("1.0.0", "1.0.0") == .orderedSame, "Test 1 failed")
assert(compareVersions("1.0.0", "1.0.1") == .orderedAscending, "Test 2 failed")
assert(compareVersions("1.0.1", "1.0.0") == .orderedDescending, "Test 3 failed")
assert(compareVersions("1.0.0-alpha", "1.0.0") == .orderedAscending, "Test 4 failed")
assert(compareVersions("1.0.0", "1.0.0-alpha") == .orderedDescending, "Test 5 failed")
assert(compareVersions("1.0.0-alpha", "1.0.0-beta") == .orderedAscending, "Test 6 failed")
assert(compareVersions("1.0.0-beta", "1.0.0-alpha") == .orderedDescending, "Test 7 failed")
assert(compareVersions("1.0.0-alpha.1", "1.0.0-alpha.beta") == .orderedAscending, "Test 8 failed")
assert(compareVersions("1.0.0-alpha.beta", "1.0.0-alpha.1") == .orderedDescending, "Test 9 failed")
assert(compareVersions("1.0.0-beta.2", "1.0.0-beta.11") == .orderedAscending, "Test 10 failed")
assert(compareVersions("1.0.0-beta.11", "1.0.0-beta.2") == .orderedDescending, "Test 11 failed")
assert(compareVersions("1.0.0-rc.1", "1.0.0") == .orderedAscending, "Test 12 failed")
assert(compareVersions("1.0.0", "1.0.0-rc.1") == .orderedDescending, "Test 13 failed")
print("All tests passed!")
}```swift
enum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
let lhsComponents = lhs.components(separatedBy: ".")
let rhsComponents = rhs.components(separatedBy: ".")
for i in 0..<max(lhsComponents.count, rhsComponents.count) {
let lhsComponent = lhsComponents.indices.contains(i) ? lhsComponents[i] : "0"
let rhsComponent = rhsComponents.indices.contains(i) ? rhsComponents[i] : "0"
if lhsComponent != rhsComponent {
if lhsComponent.hasSuffix("alpha") || rhsComponent.hasSuffix("beta") {
return .orderedAscending
} else if lhsComponent.hasSuffix("beta") || rhsComponent.hasSuffix("alpha") {
return .orderedDescending
} else {
let lhsNum = Int(lhsComponent.replacingOccurrences(of: "alpha", with: "").replacingOccurrences(of: "beta", with: "")) ?? 0
let rhsNum = Int(rhsComponent.replacingOccurrences(of: "alpha", with: "").replacingOccurrences(of: "beta", with: "")) ?? 0
if lhsNum < rhsNum {
return .orderedAscending
} else if lhsNum > rhsNum {
return .orderedDescending
}
}
}
}
return .orderedSame
}
// Unit tests for the compareVersions function
func testCompareVersions() {
assert(compareVersions("1.0.0", "1.0.0") == .orderedSame, "Test 1 failed")
assert(compareVersions("1.0.0", "1.0.1") == .orderedAscending, "Test 2 failed")
assert(compareVersions("1.0.1", "1.0.0") == .orderedDescending, "Test 3 failed")
assert(compareVersions("1.0.0-alpha", "1.0.0") == .orderedAscending, "Test 4 failed")
assert(compareVersions("1.0.0", "1.0.0-alpha") == .orderedDescending, "Test 5 failed")
assert(compareVersions("1.0.0-alpha", "1.0.0-beta") == .orderedAscending, "Test 6 failed")
assert(compareVersions("1.0.0-beta", "1.0.0-alpha") == .orderedDescending, "Test 7 failed")
assert(compareVersions("1.0.0-alpha.1", "1.0.0-alpha.beta") == .orderedAscending, "Test 8 failed")
assert(compareVersions("1.0.0-alpha.beta", "1.0.0-alpha.1") == .orderedDescending, "Test 9 failed")
assert(compareVersions("1.0.0-beta.2", "1.0.0-beta.11") == .orderedAscending, "Test 10 failed")
assert(compareVersions("1.0.0-beta.11", "1.0.0-beta.2") == .orderedDescending, "Test 11 failed")
assert(compareVersions("1.0.0-rc.1", "1.0.0") == .orderedAscending, "Test 12 failed")
assert(compareVersions("1.0.0", "1.0.0-rc.1") == .orderedDescending, "Test 13 failed")
print("All tests passed!")
}
// Run the tests
testCompareVersions()
``` // XCTAssertTrue failedenum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
let lhsComponents = lhs.split(separator: ".").map { String($0) }
let rhsComponents = rhs.split(separator: ".").map { String($0) }
let maxLength = max(lhsComponents.count, rhsComponents.count)
for i in 0..<maxLength {
let lhsComponent = i < lhsComponents.count ? lhsComponents[i] : "0"
let rhsComponent = i < rhsComponents.count ? rhsComponents[i] : "0"
if lhsComponent != rhsComponent {
if lhsComponent.hasSuffix("alpha") || rhsComponent.hasSuffix("beta") {
return .orderedAscending
} else if lhsComponent.hasSuffix("beta") || rhsComponent.hasSuffix("alpha") {
return .orderedDescending
} else {
let lhsNum = Int(lhsComponent.replacingOccurrences(of: "alpha", with: "").replacingOccurrences(of: "beta", with: "")) ?? 0
let rhsNum = Int(rhsComponent.replacingOccurrences(of: "alpha", with: "").replacingOccurrences(of: "beta", with: "")) ?? 0
if lhsNum < rhsNum {
return .orderedAscending
} else if lhsNum > rhsNum {
return .orderedDescending
}
}
}
}
return .orderedSame
}
func main() {
let testCases = [
("1.2.3", "1.2.3", .orderedSame),
("1.2.3", "1.2.4", .orderedDescending),
("1.2.3", "1.2.2", .orderedAscending),
("1.2.3alpha", "1.2.3", .orderedAscending),
("1.2.3", "1.2.3beta", .orderedDescending),
("1.2.3", "1.2.3alpha", .orderedAscending),
("1.2.3", "1.2.3alpha1", .orderedAscending),
("1.2.3alpha1", "1.2.3alpha2", .orderedAscending),
("1.2.3beta1", "1.2.3beta2", .orderedAscending),
("1.2.3alpha1", "1.2.3beta1", .orderedAscending),
("1.2.3beta1", "1.2.3alpha1", .orderedDescending)
]
for (lhs, rhs, expected) in testCases {
let result = compareVersions(lhs, rhs)
assert(result == expected, "Test failed for versions \(lhs) and \(rhs). Expected \(expected), got \(result).")
print("Test passed for versions \(lhs) and \(rhs). Result: \(result)")
}
}```swift
enum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
let lhsComponents = lhs.split(separator: ".").map { String($0) }
let rhsComponents = rhs.split(separator: ".").map { String($0) }
let maxLength = max(lhsComponents.count, rhsComponents.count)
for i in 0..<maxLength {
let lhsComponent = i < lhsComponents.count ? lhsComponents[i] : "0"
let rhsComponent = i < rhsComponents.count ? rhsComponents[i] : "0"
if lhsComponent != rhsComponent {
if lhsComponent.hasSuffix("alpha") || rhsComponent.hasSuffix("beta") {
return .orderedAscending
} else if lhsComponent.hasSuffix("beta") || rhsComponent.hasSuffix("alpha") {
return .orderedDescending
} else {
let lhsNum = Int(lhsComponent.replacingOccurrences(of: "alpha", with: "").replacingOccurrences(of: "beta", with: "")) ?? 0
let rhsNum = Int(rhsComponent.replacingOccurrences(of: "alpha", with: "").replacingOccurrences(of: "beta", with: "")) ?? 0
if lhsNum < rhsNum {
return .orderedAscending
} else if lhsNum > rhsNum {
return .orderedDescending
}
}
}
}
return .orderedSame
}
// Main function to test the compareVersions function
func main() {
let testCases = [
("1.2.3", "1.2.3", .orderedSame),
("1.2.3", "1.2.4", .orderedDescending),
("1.2.3", "1.2.2", .orderedAscending),
("1.2.3alpha", "1.2.3", .orderedAscending),
("1.2.3", "1.2.3beta", .orderedDescending),
("1.2.3", "1.2.3alpha", .orderedAscending),
("1.2.3", "1.2.3alpha1", .orderedAscending),
("1.2.3alpha1", "1.2.3alpha2", .orderedAscending),
("1.2.3beta1", "1.2.3beta2", .orderedAscending),
("1.2.3alpha1", "1.2.3beta1", .orderedAscending),
("1.2.3beta1", "1.2.3alpha1", .orderedDescending)
]
for (lhs, rhs, expected) in testCases {
let result = compareVersions(lhs, rhs)
assert(result == expected, "Test failed for versions \(lhs) and \(rhs). Expected \(expected), got \(result).")
print("Test passed for versions \(lhs) and \(rhs). Result: \(result)")
}
}
main()
```("1.2.3", "1.2.3", .orderedSame), // cannot infer contextual base in reference to member 'orderedSame'("1.2.3", "1.2.4", .orderedDescending), // cannot infer contextual base in reference to member 'orderedDescending'("1.2.3", "1.2.2", .orderedAscending), // cannot infer contextual base in reference to member 'orderedAscending'("1.2.3alpha", "1.2.3", .orderedAscending), // cannot infer contextual base in reference to member 'orderedAscending'("1.2.3", "1.2.3beta", .orderedDescending), // cannot infer contextual base in reference to member 'orderedDescending'("1.2.3", "1.2.3alpha", .orderedAscending), // cannot infer contextual base in reference to member 'orderedAscending'("1.2.3", "1.2.3alpha1", .orderedAscending), // cannot infer contextual base in reference to member 'orderedAscending'("1.2.3alpha1", "1.2.3alpha2", .orderedAscending), // cannot infer contextual base in reference to member 'orderedAscending'("1.2.3beta1", "1.2.3beta2", .orderedAscending), // cannot infer contextual base in reference to member 'orderedAscending'("1.2.3alpha1", "1.2.3beta1", .orderedAscending), // cannot infer contextual base in reference to member 'orderedAscending'("1.2.3beta1", "1.2.3alpha1", .orderedDescending) // cannot infer contextual base in reference to member 'orderedDescending'enum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
let lhsComponents = lhs.components(separatedBy: ".")
let rhsComponents = rhs.components(separatedBy: ".")
// Compare each component
for i in 0..<max(lhsComponents.count, rhsComponents.count) {
let lhsComponent = i < lhsComponents.count ? lhsComponents[i] : "0"
let rhsComponent = i < rhsComponents.count ? rhsComponents[i] : "0"
// Handle pre-release tags
if lhsComponent == "alpha" || rhsComponent == "alpha" {
if lhsComponent == "alpha" && rhsComponent != "alpha" {
return .orderedAscending
} else if lhsComponent != "alpha" && rhsComponent == "alpha" {
return .orderedDescending
} else {
continue // Both are alpha, continue to the next component
}
} else if lhsComponent == "beta" || rhsComponent == "beta" {
if lhsComponent == "beta" && rhsComponent != "beta" {
return .orderedAscending
} else if lhsComponent != "beta" && rhsComponent == "beta" {
return .orderedDescending
} else {
continue // Both are beta, continue to the next component
}
}
// Compare numeric components
if let lhsInt = Int(lhsComponent), let rhsInt = Int(rhsComponent) {
if lhsInt < rhsInt {
return .orderedAscending
} else if lhsInt > rhsInt {
return .orderedDescending
}
} else {
// If one component is numeric and the other is not, the numeric one is greater
if lhsComponent.first?.isNumber == true {
return .orderedDescending
} else if rhsComponent.first?.isNumber == true {
return .orderedAscending
}
}
}
// If all components are equal, the versions are the same
return .orderedSame
}```swift
enum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
let lhsComponents = lhs.components(separatedBy: ".")
let rhsComponents = rhs.components(separatedBy: ".")
// Compare each component
for i in 0..<max(lhsComponents.count, rhsComponents.count) {
let lhsComponent = i < lhsComponents.count ? lhsComponents[i] : "0"
let rhsComponent = i < rhsComponents.count ? rhsComponents[i] : "0"
// Handle pre-release tags
if lhsComponent == "alpha" || rhsComponent == "alpha" {
if lhsComponent == "alpha" && rhsComponent != "alpha" {
return .orderedAscending
} else if lhsComponent != "alpha" && rhsComponent == "alpha" {
return .orderedDescending
} else {
continue // Both are alpha, continue to the next component
}
} else if lhsComponent == "beta" || rhsComponent == "beta" {
if lhsComponent == "beta" && rhsComponent != "beta" {
return .orderedAscending
} else if lhsComponent != "beta" && rhsComponent == "beta" {
return .orderedDescending
} else {
continue // Both are beta, continue to the next component
}
}
// Compare numeric components
if let lhsInt = Int(lhsComponent), let rhsInt = Int(rhsComponent) {
if lhsInt < rhsInt {
return .orderedAscending
} else if lhsInt > rhsInt {
return .orderedDescending
}
} else {
// If one component is numeric and the other is not, the numeric one is greater
if lhsComponent.first?.isNumber == true {
return .orderedDescending
} else if rhsComponent.first?.isNumber == true {
return .orderedAscending
}
}
}
// If all components are equal, the versions are the same
return .orderedSame
}
// Example usage:
let version1 = "1.2.3"
let version2 = "1.2.4"
let version3 = "1.2.3-alpha"
let version4 = "1.2.3-beta"
print(compareVersions(version1, version2)) // Output: .orderedAscending
print(compareVersions(version1, version3)) // Output: .orderedDescending
print(compareVersions(version3, version4)) // Output: .orderedAscending
``` // XCTAssertTrue failedenum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
let lhsComponents = lhs.components(separatedBy: ".")
let rhsComponents = rhs.components(separatedBy: ".")
// Compare each component of the version numbers
for i in 0..<max(lhsComponents.count, rhsComponents.count) {
let lhsComponent = lhsComponents.indices.contains(i) ? lhsComponents[i] : "0"
let rhsComponent = rhsComponents.indices.contains(i) ? rhsComponents[i] : "0"
// Check if either component is a tag
if lhsComponent.hasSuffix("alpha") || lhsComponent.hasSuffix("beta") {
if !rhsComponent.hasSuffix("alpha") && !rhsComponent.hasSuffix("beta") {
return .orderedDescending
}
} else if rhsComponent.hasSuffix("alpha") || rhsComponent.hasSuffix("beta") {
return .orderedAscending
}
// Compare the components numerically
if let lhsNum = Int(lhsComponent.replacingOccurrences(of: "alpha", with: "").replacingOccurrences(of: "beta", with: "")),
let rhsNum = Int(rhsComponent.replacingOccurrences(of: "alpha", with: "").replacingOccurrences(of: "beta", with: "")) {
if lhsNum < rhsNum {
return .orderedAscending
} else if lhsNum > rhsNum {
return .orderedDescending
}
} else {
// If the components are not numeric, compare them lexicographically
if lhsComponent < rhsComponent {
return .orderedAscending
} else if lhsComponent > rhsComponent {
return .orderedDescending
}
}
}
// If all components are equal, the versions are the same
return .orderedSame
}
func main() {
let testCases = [
("1.2.3", "1.2.3", .orderedSame),
("1.2.3", "1.2.4", .orderedAscending),
("1.2.3", "1.2.2", .orderedDescending),
("1.2.3alpha", "1.2.3", .orderedDescending),
("1.2.3", "1.2.3beta", .orderedAscending),
("1.2.3", "1.2.3alpha", .orderedDescending),
("1.2.3beta", "1.2.3alpha", .orderedDescending),
("1.2.3alpha", "1.2.3beta", .orderedAscending),
("1.2.3beta", "1.2.3", .orderedAscending),
("1.2.3", "1.2.3", .orderedSame),
("1.2.3", "1.2.4", .orderedAscending),
("1.2.3", "1.2.2", .orderedDescending),
("1.2.3alpha", "1.2.3", .orderedDescending),
("1.2.3", "1.2.3beta", .orderedAscending),
("1.2.3", "1.2.3alpha", .orderedDescending),
("1.2.3beta", "1.2.3alpha", .orderedDescending),
("1.2.3alpha", "1.2.3beta", .orderedAscending),
("1.2.3beta", "1.2.3", .orderedAscending)
]
for (lhs, rhs, expected) in testCases {
let result = compareVersions(lhs, rhs)
assert(result == expected, "Test failed for comparison \(lhs) and \(rhs): expected \(expected), got \(result)")
}
print("All tests passed!")
}```swift
enum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
let lhsComponents = lhs.components(separatedBy: ".")
let rhsComponents = rhs.components(separatedBy: ".")
// Compare each component of the version numbers
for i in 0..<max(lhsComponents.count, rhsComponents.count) {
let lhsComponent = lhsComponents.indices.contains(i) ? lhsComponents[i] : "0"
let rhsComponent = rhsComponents.indices.contains(i) ? rhsComponents[i] : "0"
// Check if either component is a tag
if lhsComponent.hasSuffix("alpha") || lhsComponent.hasSuffix("beta") {
if !rhsComponent.hasSuffix("alpha") && !rhsComponent.hasSuffix("beta") {
return .orderedDescending
}
} else if rhsComponent.hasSuffix("alpha") || rhsComponent.hasSuffix("beta") {
return .orderedAscending
}
// Compare the components numerically
if let lhsNum = Int(lhsComponent.replacingOccurrences(of: "alpha", with: "").replacingOccurrences(of: "beta", with: "")),
let rhsNum = Int(rhsComponent.replacingOccurrences(of: "alpha", with: "").replacingOccurrences(of: "beta", with: "")) {
if lhsNum < rhsNum {
return .orderedAscending
} else if lhsNum > rhsNum {
return .orderedDescending
}
} else {
// If the components are not numeric, compare them lexicographically
if lhsComponent < rhsComponent {
return .orderedAscending
} else if lhsComponent > rhsComponent {
return .orderedDescending
}
}
}
// If all components are equal, the versions are the same
return .orderedSame
}
// Main function to test the compareVersions function
func main() {
let testCases = [
("1.2.3", "1.2.3", .orderedSame),
("1.2.3", "1.2.4", .orderedAscending),
("1.2.3", "1.2.2", .orderedDescending),
("1.2.3alpha", "1.2.3", .orderedDescending),
("1.2.3", "1.2.3beta", .orderedAscending),
("1.2.3", "1.2.3alpha", .orderedDescending),
("1.2.3beta", "1.2.3alpha", .orderedDescending),
("1.2.3alpha", "1.2.3beta", .orderedAscending),
("1.2.3beta", "1.2.3", .orderedAscending),
("1.2.3", "1.2.3", .orderedSame),
("1.2.3", "1.2.4", .orderedAscending),
("1.2.3", "1.2.2", .orderedDescending),
("1.2.3alpha", "1.2.3", .orderedDescending),
("1.2.3", "1.2.3beta", .orderedAscending),
("1.2.3", "1.2.3alpha", .orderedDescending),
("1.2.3beta", "1.2.3alpha", .orderedDescending),
("1.2.3alpha", "1.2.3beta", .orderedAscending),
("1.2.3beta", "1.2.3", .orderedAscending)
]
for (lhs, rhs, expected) in testCases {
let result = compareVersions(lhs, rhs)
assert(result == expected, "Test failed for comparison \(lhs) and \(rhs): expected \(expected), got \(result)")
}
print("All tests passed!")
}
main()
```("1.2.3", "1.2.3", .orderedSame), // cannot infer contextual base in reference to member 'orderedSame'("1.2.3", "1.2.4", .orderedAscending), // cannot infer contextual base in reference to member 'orderedAscending'("1.2.3", "1.2.2", .orderedDescending), // cannot infer contextual base in reference to member 'orderedDescending'("1.2.3alpha", "1.2.3", .orderedDescending), // cannot infer contextual base in reference to member 'orderedDescending'("1.2.3", "1.2.3beta", .orderedAscending), // cannot infer contextual base in reference to member 'orderedAscending'("1.2.3", "1.2.3alpha", .orderedDescending), // cannot infer contextual base in reference to member 'orderedDescending'("1.2.3beta", "1.2.3alpha", .orderedDescending), // cannot infer contextual base in reference to member 'orderedDescending'("1.2.3alpha", "1.2.3beta", .orderedAscending), // cannot infer contextual base in reference to member 'orderedAscending'("1.2.3beta", "1.2.3", .orderedAscending), // cannot infer contextual base in reference to member 'orderedAscending'("1.2.3", "1.2.3", .orderedSame), // cannot infer contextual base in reference to member 'orderedSame'("1.2.3", "1.2.4", .orderedAscending), // cannot infer contextual base in reference to member 'orderedAscending'("1.2.3", "1.2.2", .orderedDescending), // cannot infer contextual base in reference to member 'orderedDescending'("1.2.3alpha", "1.2.3", .orderedDescending), // cannot infer contextual base in reference to member 'orderedDescending'("1.2.3", "1.2.3beta", .orderedAscending), // cannot infer contextual base in reference to member 'orderedAscending'("1.2.3", "1.2.3alpha", .orderedDescending), // cannot infer contextual base in reference to member 'orderedDescending'("1.2.3beta", "1.2.3alpha", .orderedDescending), // cannot infer contextual base in reference to member 'orderedDescending'("1.2.3alpha", "1.2.3beta", .orderedAscending), // cannot infer contextual base in reference to member 'orderedAscending'("1.2.3beta", "1.2.3", .orderedAscending) // cannot infer contextual base in reference to member 'orderedAscending'enum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
let lhsComponents = lhs.split(separator: ".").map { String($0) }
let rhsComponents = rhs.split(separator: ".").map { String($0) }
let maxLength = max(lhsComponents.count, rhsComponents.count)
for i in 0..<maxLength {
let lhsComponent = i < lhsComponents.count ? lhsComponents[i] : "0"
let rhsComponent = i < rhsComponents.count ? rhsComponents[i] : "0"
if lhsComponent == rhsComponent {
continue
}
if lhsComponent.hasSuffix("alpha") || rhsComponent.hasSuffix("alpha") {
if lhsComponent.hasSuffix("alpha") && !rhsComponent.hasSuffix("alpha") {
return .orderedAscending
} else if !lhsComponent.hasSuffix("alpha") && rhsComponent.hasSuffix("alpha") {
return .orderedDescending
} else {
let strippedLhsComponent = String(lhsComponent.dropLast(5))
let strippedRhsComponent = String(rhsComponent.dropLast(5))
if let lhsInt = Int(strippedLhsComponent), let rhsInt = Int(strippedRhsComponent) {
if lhsInt < rhsInt {
return .orderedAscending
} else if lhsInt > rhsInt {
return .orderedDescending
}
}
}
} else if lhsComponent.hasSuffix("beta") || rhsComponent.hasSuffix("beta") {
if lhsComponent.hasSuffix("beta") && !rhsComponent.hasSuffix("beta") {
return .orderedAscending
} else if !lhsComponent.hasSuffix("beta") && rhsComponent.hasSuffix("beta") {
return .orderedDescending
} else {
let strippedLhsComponent = String(lhsComponent.dropLast(4))
let strippedRhsComponent = String(rhsComponent.dropLast(4))
if let lhsInt = Int(strippedLhsComponent), let rhsInt = Int(strippedRhsComponent) {
if lhsInt < rhsInt {
return .orderedAscending
} else if lhsInt > rhsInt {
return .orderedDescending
}
}
}
} else {
if let lhsInt = Int(lhsComponent), let rhsInt = Int(rhsComponent) {
if lhsInt < rhsInt {
return .orderedAscending
} else if lhsInt > rhsInt {
return .orderedDescending
}
}
}
}
return .orderedSame
}```swift
enum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
let lhsComponents = lhs.split(separator: ".").map { String($0) }
let rhsComponents = rhs.split(separator: ".").map { String($0) }
let maxLength = max(lhsComponents.count, rhsComponents.count)
for i in 0..<maxLength {
let lhsComponent = i < lhsComponents.count ? lhsComponents[i] : "0"
let rhsComponent = i < rhsComponents.count ? rhsComponents[i] : "0"
if lhsComponent == rhsComponent {
continue
}
if lhsComponent.hasSuffix("alpha") || rhsComponent.hasSuffix("alpha") {
if lhsComponent.hasSuffix("alpha") && !rhsComponent.hasSuffix("alpha") {
return .orderedAscending
} else if !lhsComponent.hasSuffix("alpha") && rhsComponent.hasSuffix("alpha") {
return .orderedDescending
} else {
let strippedLhsComponent = String(lhsComponent.dropLast(5))
let strippedRhsComponent = String(rhsComponent.dropLast(5))
if let lhsInt = Int(strippedLhsComponent), let rhsInt = Int(strippedRhsComponent) {
if lhsInt < rhsInt {
return .orderedAscending
} else if lhsInt > rhsInt {
return .orderedDescending
}
}
}
} else if lhsComponent.hasSuffix("beta") || rhsComponent.hasSuffix("beta") {
if lhsComponent.hasSuffix("beta") && !rhsComponent.hasSuffix("beta") {
return .orderedAscending
} else if !lhsComponent.hasSuffix("beta") && rhsComponent.hasSuffix("beta") {
return .orderedDescending
} else {
let strippedLhsComponent = String(lhsComponent.dropLast(4))
let strippedRhsComponent = String(rhsComponent.dropLast(4))
if let lhsInt = Int(strippedLhsComponent), let rhsInt = Int(strippedRhsComponent) {
if lhsInt < rhsInt {
return .orderedAscending
} else if lhsInt > rhsInt {
return .orderedDescending
}
}
}
} else {
if let lhsInt = Int(lhsComponent), let rhsInt = Int(rhsComponent) {
if lhsInt < rhsInt {
return .orderedAscending
} else if lhsInt > rhsInt {
return .orderedDescending
}
}
}
}
return .orderedSame
}
// Unit tests for the compareVersions function
func testCompareVersions() {
assert(compareVersions("1.2.3", "1.2.3") == .orderedSame, "1.2.3 should be equal to 1.2.3")
assert(compareVersions("1.2.3", "1.2.4") == .orderedAscending, "1.2.3 should be less than 1.2.4")
assert(compareVersions("1.2.4", "1.2.3") == .orderedDescending, "1.2.4 should be greater than 1.2.3")
assert(compareVersions("1.2.3alpha1", "1.2.3") == .orderedAscending, "1.2.3alpha1 should be less than 1.2.3")
assert(compareVersions("1.2.3", "1.2.3alpha1") == .orderedDescending, "1.2.3 should be greater than 1.2.3alpha1")
assert(compareVersions("1.2.3beta1", "1.2.3") == .orderedAscending, "1.2.3beta1 should be less than 1.2.3")
assert(compareVersions("1.2.3enum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
let lhsComponents = lhs.split(separator: ".").map { String($0) }
let rhsComponents = rhs.split(separator: ".").map { String($0) }
let maxLength = max(lhsComponents.count, rhsComponents.count)
for i in 0..<maxLength {
let lhsComponent = i < lhsComponents.count ? lhsComponents[i] : "0"
let rhsComponent = i < rhsComponents.count ? rhsComponents[i] : "0"
if lhsComponent == rhsComponent {
continue
}
if lhsComponent.hasSuffix("alpha") || rhsComponent.hasSuffix("alpha") {
if lhsComponent.hasSuffix("alpha") && !rhsComponent.hasSuffix("alpha") {
return .orderedAscending
} else if !lhsComponent.hasSuffix("alpha") && rhsComponent.hasSuffix("alpha") {
return .orderedDescending
} else {
let lhsVersion = lhsComponent.replacingOccurrences(of: "alpha", with: "")
let rhsVersion = rhsComponent.replacingOccurrences(of: "alpha", with: "")
if let lhsInt = Int(lhsVersion), let rhsInt = Int(rhsVersion) {
if lhsInt < rhsInt {
return .orderedAscending
} else if lhsInt > rhsInt {
return .orderedDescending
}
}
}
} else if lhsComponent.hasSuffix("beta") || rhsComponent.hasSuffix("beta") {
if lhsComponent.hasSuffix("beta") && !rhsComponent.hasSuffix("beta") {
return .orderedAscending
} else if !lhsComponent.hasSuffix("beta") && rhsComponent.hasSuffix("beta") {
return .orderedDescending
} else {
let lhsVersion = lhsComponent.replacingOccurrences(of: "beta", with: "")
let rhsVersion = rhsComponent.replacingOccurrences(of: "beta", with: "")
if let lhsInt = Int(lhsVersion), let rhsInt = Int(rhsVersion) {
if lhsInt < rhsInt {
return .orderedAscending
} else if lhsInt > rhsInt {
return .orderedDescending
}
}
}
} else {
if let lhsInt = Int(lhsComponent), let rhsInt = Int(rhsComponent) {
if lhsInt < rhsInt {
return .orderedAscending
} else if lhsInt > rhsInt {
return .orderedDescending
}
}
}
}
return .orderedSame
}```swift
enum ComparisonResult {
case orderedSame
case orderedAscending
case orderedDescending
}
// Function that compares two version number strings (created with respect of semantic versioning specification including "alpha" and "beta" tags) and returning their ordering as a value of type ComparisonResult.
func compareVersions(_ lhs: String, _ rhs: String) -> ComparisonResult {
let lhsComponents = lhs.split(separator: ".").map { String($0) }
let rhsComponents = rhs.split(separator: ".").map { String($0) }
let maxLength = max(lhsComponents.count, rhsComponents.count)
for i in 0..<maxLength {
let lhsComponent = i < lhsComponents.count ? lhsComponents[i] : "0"
let rhsComponent = i < rhsComponents.count ? rhsComponents[i] : "0"
if lhsComponent == rhsComponent {
continue
}
if lhsComponent.hasSuffix("alpha") || rhsComponent.hasSuffix("alpha") {
if lhsComponent.hasSuffix("alpha") && !rhsComponent.hasSuffix("alpha") {
return .orderedAscending
} else if !lhsComponent.hasSuffix("alpha") && rhsComponent.hasSuffix("alpha") {
return .orderedDescending
} else {
let lhsVersion = lhsComponent.replacingOccurrences(of: "alpha", with: "")
let rhsVersion = rhsComponent.replacingOccurrences(of: "alpha", with: "")
if let lhsInt = Int(lhsVersion), let rhsInt = Int(rhsVersion) {
if lhsInt < rhsInt {
return .orderedAscending
} else if lhsInt > rhsInt {
return .orderedDescending
}
}
}
} else if lhsComponent.hasSuffix("beta") || rhsComponent.hasSuffix("beta") {
if lhsComponent.hasSuffix("beta") && !rhsComponent.hasSuffix("beta") {
return .orderedAscending
} else if !lhsComponent.hasSuffix("beta") && rhsComponent.hasSuffix("beta") {
return .orderedDescending
} else {
let lhsVersion = lhsComponent.replacingOccurrences(of: "beta", with: "")
let rhsVersion = rhsComponent.replacingOccurrences(of: "beta", with: "")
if let lhsInt = Int(lhsVersion), let rhsInt = Int(rhsVersion) {
if lhsInt < rhsInt {
return .orderedAscending
} else if lhsInt > rhsInt {
return .orderedDescending
}
}
}
} else {
if let lhsInt = Int(lhsComponent), let rhsInt = Int(rhsComponent) {
if lhsInt < rhsInt {
return .orderedAscending
} else if lhsInt > rhsInt {
return .orderedDescending
}
}
}
}
return .orderedSame
}
// Unit tests for the compareVersions function
func testCompareVersions() {
assert(compareVersions("1.0.0", "1.0.0") == .orderedSame, "Test 1 failed")
assert(compareVersions("1.0.0", "1.0.1") == .orderedAscending, "Test 2 failed")
assert(compareVersions("1.0.1", "1.0.0") == .orderedDescending, "Test 3 failed")
assert(compareVersions("1.0.0-alpha", "1.0.0") == .orderedAscending, "Test 4 failed")
assert(compareVersions("1.0.0", "1.0.0-alpha") == .orderedDescending, "Test 5 failed")
assert(compareVersions("1.0.0-alpha.1", "1.0.0-alpha.2") == .orderedAscending, "Test 6 failed")
assert(compareVersions("1.0.0-alpha.2", "1.0.0-alpha.1") == .orderedDescending, "Test 7 failed")
assert(compareVersions("1.0.0-beta.1", "1.0.