A proposal for awaitAny and joinAny

[ShreckYe]

I'd like to propose a set of awaitAny and joinAny functions, which serve as counterparts to awaitAlls and joinAlls and are shortcuts to select in some cases. They can easily be implemented with select like this:

suspend fun <T> awaitAny(vararg deferreds: Deferred<T>): T =
    select { deferreds.forEach { it.onAwait { it } } }

suspend fun <T> Collection<Deferred<T>>.awaitAny(): T =
    select { forEach { it.onAwait { it } } }

suspend fun joinAny(vararg jobs: Job): Unit =
    select { jobs.forEach { it.onJoin { it } } }

suspend fun Collection<Job>.joinAny(): Unit =
    select { forEach { it.onJoin { it } } }

[JakeWharton]

See #2867. Your implementation allows losing coroutines to continue to do work despite their result never being used.

[dkhalanskyjb]

Yep, duplicate of #2867