typealias UserId = String
fun example(scope: CoroutineScope, currentUserIdFlow: Flow<UserId>) {
    scope.launch {
        var numberOfTimesUserHasChanged = 0
        currentUserIdFlow
            .onEach {
                numberOfTimesUserHasChanged++
            }
            .collect {
                updateUi(numberOfTimesUserHasChanged)
            }
    }
}