my flow is `Flow lt List lt T gt gt ` can i convert it to `Flow lt T gt ` with something like `flatten` on arrays on std lib

you need to map lists to flows before `flow map it asFlow flattenConcat ` Or `flow flatMapConcat it asFlow `

```fun lt T gt Flow lt List lt T gt gt flattened Flow lt T gt = flow collect list gt list forEach emit it ```

my flow is `Flow lt List lt T gt gt ` can i convert it to `F kotlinlang #coroutines

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Title

william

10/25/2020, 6:28 PM

my flow is

Flow<List<T>>

, can i convert it to

Flow<T>

with something like

flatten

on arrays on std lib?

bezrukov

10/25/2020, 6:50 PM

flow.flattenConcat()

william

10/25/2020, 6:58 PM

the docs say "Flattens the given flow of flows into a single flow" so that isn't quite right i don't think

bezrukov

10/25/2020, 7:20 PM

you need to map lists to flows before,

flow.map { it.asFlow() }.flattenConcat()

flow.flatMapConcat { it.asFlow() }

louiscad

10/25/2020, 8:25 PM

fun <T> Flow<List<T>>.flattened(): Flow<T> = flow {
    collect { list ->
        list.forEach { emit(it) }
    }
}

@william The extension above can do.

william

10/25/2020, 9:14 PM

thanks guys!

florent

10/26/2020, 10:36 PM

Hum when you do that collect in which thread is that code executed?

louiscad

10/26/2020, 10:52 PM

@florent One of the threads of the dispatcher running the coroutine that calls

collect

florent

10/26/2020, 11:41 PM

If the terminal operator of that stream is a collect that emit on the UI thread, would the collect of that function also be executed on the UI thread?

louiscad

10/27/2020, 7:12 AM

emit

can be called on a different thread if you use

flowOn

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