Coin Counter - Swift Typing CST Test
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Coin Counter — Swift Code
Counts coins collected and lost using Swift closures.
var coins = 0
let updateUI: () -> Void = { print("Coins: \(coins)") }
let collectCoin: () -> Void = { coins += 1; updateUI() }
let loseCoin: () -> Void = { coins -= 1; updateUI() }
// Simulate actions
updateUI()
collectCoin()
collectCoin()
loseCoin()Swift Language Guide
Swift is a powerful, general-purpose, compiled programming language developed by Apple for iOS, macOS, watchOS, tvOS, and Linux. It emphasizes safety, performance, and modern programming practices.
Primary Use Cases
- ▸iOS app development
- ▸macOS desktop applications
- ▸watchOS and tvOS apps
- ▸Server-side applications using Swift on Linux
- ▸Cross-platform development with SwiftUI or server frameworks
Notable Features
- ▸Strong static typing with type inference
- ▸Optionals to handle nullability safely
- ▸Protocol-oriented programming
- ▸Modern syntax with closures and generics
- ▸SwiftUI for declarative UI development
Origin & Creator
Created by Apple Inc., primarily by Chris Lattner, and first released in 2014.
Industrial Note
Swift is specialized for Apple ecosystem development, including apps for iPhone, iPad, Mac, Apple Watch, and Apple TV, but can also be used on servers and Linux platforms.