Objective C

Use when blocks (closures) and Grand Central Dispatch in Objective-C for concurrent programming including block syntax, capture semantics, dispatch queues, dispatch groups, and patterns for thread-safe asynchronous code.

Use when automatic Reference Counting in Objective-C including strong/weak references, retain cycles, ownership qualifiers, bridging with Core Foundation, and patterns for memory-safe code without manual retain/release.

Use when objective-C protocols for defining interfaces and categories for extending classes, including formal protocols, optional methods, class extensions, and patterns for modular, reusable code design.