Dart Asynchronous Programming

Future<String> fetchUser() async {
  await Future.delayed(Duration(seconds: 2));
  return 'Sita';
}

void main() async {
  String name = await fetchUser();
  print(name);  // 'Sita'
}

Stream<int> countStream() async* {
  for (int i = 1; i <= 5; i++) {
    await Future.delayed(Duration(seconds: 1));
    yield i;
  }
}
countStream().listen((number) => print(number));

var results = await Future.wait([fetchUsers(), fetchPosts()]);