How do you “close” a flow? I’m trying to wrap a pa...

# coroutines

[Sam Garfinkel]

How do you “close” a flow? I’m trying to wrap a paginated API call, with ktor, into a flow. I want the flow to emit all pages, and stop emitting once I’ve queried the last page.

[zak.taccardi]

cancel the scope it’s launched with

[Sam Garfinkel]

So this would work?

flow {
    emit(page)
    if(page.isLast) {
       cancel()
    }
}

[Zach Klippenstein (he/him) [MOD]]

If you’re using the flow builder (or callback/channelFlow), just return from the lambda. You don’t need to cancel.

[zak.taccardi]

once the flow { .. } lambda completes, the flow cancels automatically

[Sam Garfinkel]

Oh yeah I forgot about that. I guess I need a repeat in there.

[Sam Garfinkel]

Is there sugar for a while loop that also counts the number of iterations? Not coroutine related but is related my original question

[Zach Klippenstein (he/him) [MOD]]

Not on a raw while loop, but a lot of the iterable/sequence operators have a WithIndex or Indexed version that does.