Return value only of the faster coroutine

Question

How can I run multiple coroutines in parallel and return only the value of the one that finishes first?

Real-life scenario, I have two data sources - Database

Answer 1

I came up with following implementation:

suspend fun getFaster(): Int = coroutineScope {
    select {
        async { getFromServer() }.onAwait { it }
        async { getFromDB() }.onAwait { it }
    }.also {
        coroutineContext.cancelChildren()
    }
}

The coroutineScope acts as a parent to all async calls performed within. After the select finishes we can just cancel the rest.