coroutines-kotlin

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Master Kotlin coroutines with suspend functions, flows, channels, and structured concurrency for building async applications.

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[Code Generation]

When & Why to Use This Skill

This Claude skill provides a comprehensive guide and implementation framework for Kotlin Coroutines, enabling developers to build high-performance asynchronous applications. It covers essential concepts such as suspend functions, flows, channels, and structured concurrency, helping users write cleaner, non-blocking, and more maintainable Kotlin code for Android and backend development.

Use Cases

  • Asynchronous API Integration: Implementing non-blocking network calls and database operations to ensure smooth UI performance in Android apps or high throughput in Ktor-based backends.
  • Reactive Stream Processing: Utilizing Kotlin Flows to handle real-time data streams, transformations, and emissions with built-in backpressure support.
  • Structured Concurrency Management: Organizing multiple concurrent tasks within defined scopes to prevent memory leaks and ensure robust error handling and task cancellation.
  • Legacy Code Modernization: Refactoring complex callback-based or RxJava code into sequential, readable coroutine-based logic using suspend functions and async/await patterns.
namecoroutines-kotlin
descriptionMaster Kotlin coroutines with suspend functions, flows, channels, and structured concurrency for building async applications.

Kotlin Coroutines

Master asynchronous programming in Kotlin with coroutines, flows, and structured concurrency.

Core Concepts

Basic Coroutine

fun main() = runBlocking {
    launch {
        delay(1000L)
        println("World!")
    }
    println("Hello")
}

Suspend Functions

suspend fun fetchUser(id: String): User {
    delay(1000) // Simulating network call
    return User(id, "John Doe")
}

fun main() = runBlocking {
    val user = fetchUser("123")
    println(user)
}

Async/Await

suspend fun loadData(): Data = coroutineScope {
    val user = async { fetchUser() }
    val posts = async { fetchPosts() }

    Data(user.await(), posts.await())
}

Flow

fun simpleFlow(): Flow<Int> = flow {
    for (i in 1..3) {
        delay(100)
        emit(i)
    }
}

fun main() = runBlocking {
    simpleFlow().collect { value ->
        println(value)
    }
}

Channels

fun main() = runBlocking {
    val channel = Channel<Int>()

    launch {
        for (x in 1..5) channel.send(x * x)
        channel.close()
    }

    for (y in channel) println(y)
}

Best Practices

  1. Use structured concurrency
  2. Handle exceptions properly
  3. Use flows for streams
  4. Leverage coroutine scope
  5. Use dispatchers appropriately
  6. Avoid GlobalScope
  7. Test coroutines properly

Resources