result doesn't return anything

[mariomka]

Maybe I'm wrong but reading result documentation seems that it will return a new Result applying the appropriate function but it returns void. Something like a fold method.

dart_result_type/lib/src/result.dart

Lines 65 to 66 in 21b2ac2

	/// Returns a new value of [Result] from closure
	/// either a success or a failure.

If it isn't the expected behavior of the result, can you consider adding a fold method? Implementation should be like this:

Result<U, E> fold<U, E>(U Function(S) success, E Function(F) failure) {
  if (isSuccess) {
    final left = this as Success<S, F>;
    return Success(success(left.value));
  }

  final right = this as Failure<S, F>;
  return Failure(failure(right.value));
}

[slawekkrol]

You can check Pull request with fold method, I already created this one:
https://github.com/slawekkrol/dart_result_type/tree/feature/fold_function