success

main.dart

void main() async {
  final futures = <Future<String>>[
    Future.delayed(
      Duration(seconds: 1),
      () => 'Hello1',
    ),
    Future.delayed(
      Duration(seconds: 2),
      () => 'Hello2',
    ),
  ];

  final waited = await Future.wait(futures);

  final actual = waited.singleWhere(
    (element) => element == 'Hello1',
    orElse: () => 'unknown',
  );

  print(actual);
}