Future.wait vs individual await

repro_futures_individual_await.dart

// ignore_for_file: unused_local_variable

Future<void> main() async {
  final start = DateTime.now();

  final firstFuture = Future<int>.delayed(const Duration(seconds: 1), () => 1);
  final secondFuture = Future<double>.delayed(const Duration(seconds: 1), () => 1.0);
  final thirdFuture = Future<String>.delayed(const Duration(seconds: 1), () => '1');

  // static types are given
  final first = await firstFuture;
  final second = await secondFuture;
  final third = await thirdFuture;

  final end = DateTime.now();
  // takes 1s
  print('difference: ${end.difference(start).inSeconds}s');
}

repro_futures_list_wait.dart

// ignore_for_file: unused_local_variable

Future<void> main() async {
  final start = DateTime.now();
  final futures = await Future.wait([
    Future<int>.delayed(const Duration(seconds: 1), () => 1),
    Future<double>.delayed(const Duration(seconds: 1), () => 1.0),
    Future<String>.delayed(const Duration(seconds: 1), () => '1'),
  ]);
  // static analysis doesn't give us an error if indexes are wrong, types are lost in list
  final first = futures[0] as int;
  final second = futures[1] as double;
  final third = futures[2] as String;

  final end = DateTime.now();
  // takes 1s
  print('difference: ${end.difference(start).inSeconds}s');
}