what is the equivalent in Kotlin for await Promise.all()

# coroutines

[Bernhard]

what is the equivalent in Kotlin for await Promise.all()

[Joffrey]

If you have a list of Deferred, you can use list.awaitAll() on it.

[Joffrey]

But using coroutineScope on its own to wrap all your coroutines is sometimes enough, because it waits for child coroutines by default

[Bernhard]

objects.asFlow()
        .map { it.getRequest().await() }
        .toList()

[Bernhard]

or is that a bad idea?

[Joffrey]

What does getRequest() return?

[Bernhard]

a promise

[Bernhard]

https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.js/-promise/

[Bernhard]

I know there's an all method on it, was just interested in the more generic solution

[Joffrey]

Ah, then this code would work, but it will start and await each request one by one (they will not run concurrently)

[Bernhard]

oh I see

[Bernhard]

so flows are sequential in that case

[Bernhard]

kinda like sequences: one element processed at a time

[Bernhard]

I guess this then inside a suspending function:

objects
        .map { it.getRequest().asDeferred() }
        .awaitAll()

[Joffrey]

Yeah I don't think you need a flow here. Your last snippet is a great option

[Bernhard]

thank you