Async Calls in Flutter

Synchronous/asynchronous generator in function await for wait till command finished async* (async each) for a stream whenever there is an update in stream yield* (yield each) for returning an update from a stream import ‘dart:async’;import ‘dart:io’;main() { listenCountDown();}listenCountDown() async { await for (var tick in countUp()) { print(“countDown $tick”); }}Stream<int> countDown() async* { var i