"Programs adopting approachable concurrency are single-threaded by default, which is ideal for scripts and UI code, and provide greater resilience for asynchronous code that accesses mutable state by running it on the caller's executor thread. When you want to ensure an async method is run on the concurrent thread pool instead of in the caller's context, you can use the @concurrent annotation. InfoQ previously covered approachable concurrency following its announcement at Apple's WWDC 2025, providing additional detail and context."
"The syntax to declare an inline array is: var inlineArray: [50 of String]. The second feature is , a safe alternative to buffer pointers to access contiguous memory. Span maintains memory safety by ensuring the memory remains valid while you're using it. These guarantees are checked at compile time with no runtime overhead, and define away the memory safety problems inherent to pointers, such as use-after-free bugs."
Swift 6.2 makes approachable concurrency the default model, enabling single-threaded execution ideal for scripts and UI while running asynchronous code on the caller's executor thread to reduce mutable-state races. The @concurrent annotation forces async methods to run on the concurrent thread pool instead of the caller's context. Two low-level types, InlineArray (fixed-size inline storage, e.g., var inlineArray: [50 of String]) and Span (a safe alternative to buffer pointers), provide predictable performance and compile-time-checked memory safety with no runtime overhead. An opt-in strict memory safety mode detects unsafe constructs for remediation. A new Wasm SDK adds WebAssembly compilation support.
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