Test exercise for Flutter (Race condition)

main.dart

class Result {
  final dynamic value;
  final bool isSuccess;
  
  Result.success(this.value) : isSuccess = true;
  Result.error() : value = null, isSuccess = false;
}

Future<List<Result>> allSettled(List<Future> futures) async {
  return [];
}

void main() async {
  final futures = [
    Future.delayed(Duration(seconds: 3), () => 100),
    Future.delayed(Duration(seconds: 1), () => 200),
    Future.delayed(Duration(seconds: 2), () => throw 'Error'),
    Future.delayed(Duration(milliseconds: 500), () => 300),
  ];

  final results = await allSettled(futures);
  
  // Should return results in order: index 0, 1, 2, 3
  for (var i = 0; i < results.length; i++) {
    print('Index $i: ${results[i].isSuccess ? results[i].value : 'ERROR'}');
  }
  
  // Expectet output:
  // Index 0: 100
  // Index 1: 200  
  // Index 2: ERROR
  // Index 3: 300
}