Mastering Kotlin Coroutines/

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Coroutine Builders Job

Coroutine Builders Job

Learn how coroutine builders create their jobs based on their parent's job.

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Every coroutine builder from the Kotlin coroutines library creates its own job. Most coroutine builders return their jobs so we can use them elsewhere. This is visible for launch, where Job is an explicit result type.

package kotlinx.coroutines.app
import kotlinx.coroutines.*

fun main(): Unit = runBlocking {
   val job: Job = launch {
       delay(1000)
       println("Test")
   }
}
Job used as an explicit return type

The type returned by the async function is Deferred<T>, and Deferred<T> also implements the Job interface so we can use it similarly.

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package kotlinx.coroutines.app
import kotlinx.coroutines.*
fun main(): Unit = runBlocking {
   val deferred: Deferred<String> = async {
       delay(1000)
       "Test"
   }
   val job: Job = deferred
}

Since Job ...