awaiting for multiple futures with different return types executing in parallel without Future.wait. https://dartpad.dev/ff8617ecf0f40ea26c028c26531bc719

main.dart

void main() {
  futureTest();
}

futureTest() async {
  final watch = Stopwatch()..start();
  print("elapsed: ${watch.elapsedMilliseconds}");
  final futureInt = Future.delayed(Duration(seconds: 2), () => 1);
  final futureString = Future<String>.delayed(Duration(seconds: 2), () => "laterz");

  final n = await futureInt;
  final s = await futureString;
  print('n $n s $s');
  print("elapsed: ${watch.elapsedMilliseconds}");
}

The gist of it is that this approach is type safe. Future.wait requres Futures to return the same type, or it could be used as Future.wait<dynamic>(), which loses type safety.

Using await directly on each future will cause them to run one after another instead. Setting them in variables starts the asynchronous execution, then using await on the variables allows retrieval of the results.