state-reducer-flow-example-3.kt

class ViewModel {

    private val events = Channel<Event>()

    val state = events.receiveAsFlow()
        .runningFold(State(), ::reduceState)
        .stateIn(viewModelScope, Eagerly, State())

    fun handleEvent(event: Event) {
        events.trySend(event)
    }

    private fun reduceState(currentState: State, event: Event): State {
        return when (event) {
            is Increment -> currentState.copy(counter = currentState.counter + 1)
            is Decrement -> currentState.copy(counter = currentState.counter - 1)
        }
    }
}

Article: https://maciej-sady.medium.com/all-you-need-for-mvi-is-kotlin-how-to-reduce-without-reducer-5e986856610f
Project: https://github.com/linean/StateReducerFlow