What's the best way to flatten a `Flow<Flow<...

# coroutines

[julian]

What's the best way to flatten a Flow<Flow<T>> to Flow<T>?

[Javier]

What is the usecase of that? You have emitAll to emit a flow without having to collect + emit

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

There are some operators for this:

flattenConcat – https://kotlin.github.io/kotlinx.coroutines/kotlinx-coroutines-core/kotlinx.coroutines.flow/flatten-concat.html
flattenMerge – https://kotlin.github.io/kotlinx.coroutines/kotlinx-coroutines-core/kotlinx.coroutines.flow/flatten-merge.html
transformLatest – https://kotlin.github.io/kotlinx.coroutines/kotlinx-coroutines-core/kotlinx.coroutines.flow/transform-latest.html (use with emitAll like @Javier said)

[julian]

Thanks @Javier @Zach Klippenstein (he/him) [MOD]!