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kotlincollectionskotlin-flow

Combine two state flows into new state flow

I have two state flows. Is it possible to combine them and get new state flow? Logically it should be possible because both state flows have initials values, but as I see combine function returns just Flow and not StateFlow.

Solution

  • So far I created function:

    fun <T1, T2, R> combineState(
        flow1: StateFlow<T1>,
        flow2: StateFlow<T2>,
        scope: CoroutineScope = GlobalScope,
        sharingStarted: SharingStarted = SharingStarted.Eagerly,
        transform: (T1, T2) -> R
): StateFlow<R> = combine(flow1, flow2) {
    o1, o2 -> transform.invoke(o1, o2)
}.stateIn(scope, sharingStarted, transform.invoke(flow1.value, flow2.value))