Swift

Use when swift's modern concurrency model including async/await, actors, task groups, structured concurrency, and async sequences for building safe, performant concurrent code without data races or callback pyramids.

Use when protocol-oriented programming in Swift including protocol extensions, default implementations, protocol composition, associated types, and designing flexible, reusable abstractions that favor composition over inheritance.

Use when swift's optional handling patterns including optional binding, chaining, nil coalescing, and modern approaches to safely working with optional values while avoiding common pitfalls and force unwrapping.