modern-swift

SKILL.md

Swift 6.2 introduces strict compile-time concurrency checking with async/await, actors, and Sendable constraints that prevent data races at compile time instead of runtime. This is the foundation of safe concurrent Swift.

Modern Swift replaces older concurrency patterns (completion handlers, DispatchQueue, locks) with compiler-enforced safety. The core principle: if it compiles with strict concurrency enabled, it cannot have data races.

| Async operation | async/await | Completion handlers | | Main thread work | @MainActor | DispatchQueue.main | | Shared mutable state | actor | Locks, serial queues | | Parallel tasks | TaskGroup | DispatchGroup | | Thread safety | Sendable | @unchecked everywhere |

在編寫異步/等待代碼、啟用嚴格並發、修復可發送錯誤、從完成處理程序遷移、管理與參與者的共享狀態或使用任務/任務組進行並發時使用。 來源：johnrogers/claude-swift-engineering。

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