swift-programmer

Swift 6 concurrency replaces manual threading with an actor model and compile-time data race safety via the Sendable protocol, ensuring thread-safe execution without explicit locks.

Refactor legacy Swift applications by replacing classes managing shared mutable state with actors, isolating state access, and applying @MainActor for UI updates to prevent data races.

Actor re-entrancy in Swift allows interleaving execution when an actor awaits an operation, potentially causing intermediate state corruption if not properly managed during concurrent access.

Implement protocol-oriented programming by composing protocols and using value semantics (structs and enums) to ensure predictable state copying, preventing unintended side effects.

You need the Sendable protocol when passing data across concurrency domains in Swift 6, allowing the compiler to verify type safety and prevent data races during concurrent execution.

Use the @concurrent attribute in Swift 6.2 to optimize execution by explicitly marking functions for concurrent evaluation, improving performance in strict concurrency environments.