Dart Async Programming

main.dart

//https://dartpad.dev/?id=53c529ef49cb95ed35294d4afe3a7179

void main() {
  print('Fetching data...');
//   fetchData();
//   String data = await fetchDataAsync();
//    print(data);
//   connectStream();
  print('Doing other work...');
}



void fetchData() {
  Future.delayed(Duration(seconds: 2), () {
    print('Data fetched');
  });
}

Future<String> fetchDataAsync() async {
  await Future.delayed(Duration(seconds: 2));
  return 'Data fetched';
}


void connectStream()async {
   await for (int value in countStream()) {
    print(value);
  }
}

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