kotlinx-coroutines

Structured concurrency in Kotlin ensures a parent coroutine scope waits for all children to complete, automatically propagating cancellation downward. This prevents memory leaks by guaranteeing no child coroutine outlives its parent scope.

Use Kotlin Flow for reactive streaming data. StateFlow and SharedFlow enable reactive UI patterns by emitting multiple values over time, replacing manual callback management with structured, cancellable data streams.

Coroutine cancellation propagates through structured concurrency, stopping child jobs when a parent cancels. Suspend functions cooperate by checking cancellation status, ensuring clean resource cleanup and preventing orphaned background tasks.

Kotlin coroutines work across JVM and Android. Dispatchers control thread execution context, routing coroutine work to appropriate thread pools for UI updates or heavy background computation on either platform.

Use runTest for testing Kotlin coroutines with deterministic time control. This coroutine-aware testing pattern replaces real delays with virtual time, ensuring reliable assertions for suspend functions and Flow emissions.

Coroutines leak memory without structured concurrency, as orphaned jobs keep running without parent oversight. Properly scoped coroutines enforce cancellation propagation, ensuring all child jobs terminate when their parent scope ends.