state-reducer-flow-example-2.kt

class ViewModel {

    private val events = Channel<Event>()

    val state = MutableStateFlow(State())

    init {
        events.receiveAsFlow()
            .onEach(::updateState)
            .launchIn(viewModelScope)
    }

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

    private fun updateState(event: Event) {
        when (event) {
            is Increment -> state.update { it.copy(counter = it.counter + 1) }
            is Decrement -> state.update { it.copy(counter = it.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