A modern programming language that makes developers happier.

kotlinlang

Hi, how can I run concurrent coroutines and wait all are done (like Promise.all in JS) ? I see the method with a map which create `Deferred` then call `await()` :
``` 
data.map {
                async(Bg) { it.httpGet().response() }
            }.map {
                it.await()
            }
```
Is it the good approach ?

Good, thank you! Do you know how to write a race condition ? I mean await until the first coroutines is done.

Also there is a proposal to add extension function for such cases:
<https://github.com/Kotlin/kotlinx.coroutines/issues/171>
But for now you can write such function yourself

Race condition? What do you mean?
To wait when first coroutine is done just call await on first coroutine. But actually this code already does this

Like Promise.race in JS, I want to wait until one of my coroutine is complete (not nessary the first but the fastest)

you can use `select` together with `Deferred.onAwait` for that

Here’s a few PromiseJS like operations on lists of Deferreds: <https://github.com/venkatperi/kotlin-coroutines-lib/blob/master/docs/com.vperi.kotlinx.coroutines.experimental/kotlin.collections.-iterable/index.md>