Agent skill

coroutines-kotlin

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

View SKILL.md on GitHub Repository
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Install this agent skill to your Project

npx add-skill https://github.com/majiayu000/claude-skill-registry/tree/main/skills/development/coroutines-kotlin-spjoshis-claude-code-plugins

SKILL.md

Kotlin Coroutines

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

Core Concepts

Basic Coroutine

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

Suspend Functions

kotlin
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

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

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

Flow

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

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

Channels

kotlin
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

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