Swift — Apple Modern Programming Language

What it is

Swift is a general-purpose programming language created at Apple to replace Objective-C. It compiles to native code and runs on iOS, macOS, watchOS, tvOS, Linux, and server environments. Swift combines performance close to C with modern language features like type inference, optionals, closures, and protocol-oriented design. The language is open-source and actively maintained by Apple and the Swift community.

Swift targets app developers building for Apple platforms, server-side developers who want a type-safe compiled language, and teams looking for a modern alternative to C++ in systems-adjacent work.

How it saves time or tokens

Swift's type safety and compiler checks catch bugs at compile time that would otherwise surface as runtime crashes. Optionals force explicit null handling, eliminating an entire class of runtime errors. For AI-assisted coding, Swift's strong type system gives coding agents better context for generating correct code, reducing the number of iterations needed.

How to use

1. Install Xcode on macOS (includes Swift) or download Swift from swift.org for Linux
2. Create a new project with swift package init or Xcode's project wizard
3. Write Swift code and build with swift build or Xcode's build system

Example

import Foundation

struct Task: Codable {
    let id: Int
    let title: String
    var isComplete: Bool
}

func fetchTasks() async throws -> [Task] {
    let url = URL(string: "https://api.example.com/tasks")!
    let (data, _) = try await URLSession.shared.data(from: url)
    return try JSONDecoder().decode([Task].self, from: data)
}

// Swift's async/await makes network code readable
let tasks = try await fetchTasks()
for task in tasks where !task.isComplete {
    print("TODO: \(task.title)")
}

Related on TokRepo

• AI tools for coding — Browse AI coding assistants that support Swift
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Common pitfalls

• Swift's strict optional system frustrates newcomers; learn optional binding (if let, guard let) early
• Swift Package Manager and CocoaPods can conflict; pick one dependency manager per project
• Linux support covers the standard library but not Apple frameworks like UIKit or SwiftUI