Kotlin Coroutines with returning value

Question

I want to create a coroutine method which has returning value.

For example)

fun funA() = async(CommonPool) {
    return 1
}

fun funB() = async(Commo         


        

Answer 1

Here's another way to run funA() and funB() in parallel without using runBlocking.

fun funA() = CoroutineScope(Dispatchers.IO).async {
    delay(3000)
    return@async 1
}

fun funB() = CoroutineScope(Dispatchers.IO).async {
    delay(3000)
    return@async 2
}

fun sum() = CoroutineScope(Dispatchers.IO).async {
    val a = funA()
    val b = funB()
    return@async a.await() + b.await()
}

And if you want to run sum() without blocking the main thread,

CoroutineScope(Dispatchers.IO).launch {
    measureTimeMillis {
        Log.d("TAG", "sum=${sum().await()}")
    }.also {
        Log.d("TAG", "Completed in $it ms")
    }
}