02. Dart method (for test)

hint.txt

Assign data to result

main.dart

/// Update value for result
void plus(int a, int b, Result result) {
}

class Result {
   int value = 0;
}

// Testcase
// void main() {
//   try {
//     final result = Result();
//     final str = plus(2, 3, result); 

//     if (result == 5) {
//       _result(true);
//     } else if (result == 0) {
//       _result(false, ['Test failed. It looks like you forgot assign data!']);
//     } else {
//       _result(false, ['That\'s not quite right. Keep trying!']);
//     }
//   } catch (e) {
//     _result(false, ['Tried calling plus(2, 3), but received an exception: ${e.runtimeType}']);
//   }
// }

solution.dart

void plus(int a, int b, Result result) {
   result.value = a + b;
}

test.dart

void main() {
  try {
    final result = Result();
    final str = plus(2, 3, result); 

    if (result == 5) {
      _result(true);
    } else if (result == 0) {
      _result(false, ['Test failed. It looks like you forgot assign data!']);
    } else {
      _result(false, ['That\'s not quite right. Keep trying!']);
    }
  } catch (e) {
    _result(false, ['Tried calling plus(2, 3), but received an exception: ${e.runtimeType}']);
  }
}