Hello :wave: Was just wondering about Flow and context (<https://kotlinlang.org/docs/flow.html#flow-...

# coroutines

[Dariusz Kuc]

Hello 👋
Was just wondering about Flow and context (https://kotlinlang.org/docs/flow.html#flow-context). I understand that we should not be emitting new values from new coroutines but is it fine to start coroutines to fetch some data or that should still fall under channelFlow? e.g.

flowOf(1, 2, 3).map { 
  id -> coroutineScope {
    val first = async { retrieve(id) }
    val second = async { retrieveOther(id) }
    first.await() + second.await()
  }
}

[louiscad]

Your snippet correct. That rule only applies to call to emit

[Dariusz Kuc]

thanks

[louiscad]

The reason is that calling emit calls code from the collector side directly, and you'd not expect it to be cancelled by the upstream flow code or have it run on an unknown dispatcher.

[louiscad]

In other words, the emit function calls the lambda of collect.

[Dariusz Kuc]

Thanks for the explanation