groupBy

@FlowPreview()
fun <T, K> Flow<T>.groupBy(keySelector: suspend (T) -> K): Flow<GroupedFlow<K, T>>
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Groups the upstream values into their own Flows keyed by the value returned by the keySelector function.

@FlowPreview()
fun <T, K, V> Flow<T>.groupBy(keySelector: suspend (T) -> K, valueSelector: suspend (T) -> V): Flow<GroupedFlow<K, V>>
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Groups the mapped upstream values into their own Flows keyed by the value returned by the keySelector function.