Play with Dart futures

main.dart

void main() async {
  Stopwatch stopwatch = new Stopwatch()..start();

  var p1 = delay(Duration(seconds: 2));
  var p2 = fetchData();

  await p1;
  final data = await p2;

  print('Executed in ${stopwatch.elapsed} with data: $data');
}

Future delay(duration) => Future.delayed(duration);

Future<int> fetchData() => Future.value(42);