CalculatorViewModel.kt

class CalculatorViewModel : ViewModel() {
    var v1 by mutableStateOf("0")
    var v2 by mutableStateOf("0")
    var result by mutableStateOf("0")
        private set

    init {
        snapshotFlow { v1 to v2 }
            .mapLatest {
                sum(it.first, it.second)
            }
            .onEach {
                result = it
            }
            .launchIn(viewModelScope)
    }
}