kotlin-coroutines-expert

Topics in the source

• Kotlin Coroutines Expert
• Overview
• When to Use This Skill
• Step-by-Step Guide
• 1. Structured Concurrency
• 2. Exception Handling
• 3. Reactive Streams with Flow
• Examples

A guide to mastering asynchronous programming with Kotlin Coroutines. Covers advanced topics like structured concurrency, Flow transformations, exception handling, and testing strategies. Use when implementing asynchronous operations in Kotlin. Use when designing reactive data streams with Flow. Use when debugging coroutine cancellations or exceptions. Use when writing unit tests for suspending functions or Flows. Always launch coroutines within a defined CoroutineScope. Use coroutineScope or supervisorScope to group concurrent tasks. Use CoroutineExceptionHandler for top-level scopes, but rely on try-catch within suspending functions for granular control. Use StateFlow for state that needs to be retained, and SharedFlow for events. ✅ Do: Use Dispatchers.IO for blocking I/O operations. ✅ Do: Cancel scopes when they are no longer needed (e.g., ViewModel.onCleared). ✅ Do: Use TestScope and runTest for unit testing coroutines. ❌ Don't: Use GlobalScope. It breaks structured concurrency and can lead to leaks. ❌ Don't: Catch CancellationException unless you rethrow it. Problem: Coroutine test hangs or fails unpredictably. Solution: Ensure you are using runTest and injecting TestDispatche

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