Kotlin

Use when kotlin coroutines for structured concurrency including suspend functions, coroutine builders, Flow, channels, and patterns for building efficient asynchronous code with cancellation and exception handling.

Use when kotlin's null safety system including nullable types, safe calls, Elvis operator, smart casts, and patterns for eliminating NullPointerExceptions while maintaining code expressiveness and clarity.

Use when domain-specific language design in Kotlin using type-safe builders, infix functions, operator overloading, lambdas with receivers, and patterns for creating expressive, readable DSLs for configuration and domain modeling.