what will be the simplest code for concurrent waiting on 2 suspend function and finish on first one,...

# coroutines

[Ciprian Grigor]

what will be the simplest code for concurrent waiting on 2 suspend function and finish on first one, cancelling the other one something like awaitFirst(…) or joinFirst()

[Richard Gomez]

This has been discussed a few times before. Perhaps something like this, or using a supervisorscope to cancel everything?

https://kotlinlang.slack.com/archives/C1CFAFJSK/p1627778065023200?thread_ts=1627721102.019900&cid=C1CFAFJSK

[bezrukov]

we copied raceOf from splitties
so it will look like:

val result = raceOf(
   { suspendFun1() },
   { suspendFun2() },
}

there is a request to add this fun to coroutines lib https://github.com/Kotlin/kotlinx.coroutines/issues/2867

[Ciprian Grigor]

@bezrukov needs the suspending functions to be extensions of a coroutine scope?

suspend fun <T> raceOf(vararg racers: suspend CoroutineScope.() -> T): T

[bezrukov]

not necessary, you can make it simply suspend () -> T if you want