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