epam-cross-platform-lab/dart_result_type

💊 Result Type for Dart represents either a success or a failure, including an associated value in each case.

dart_result_type's Issues

Empty return statement for Success?

Maybe there's an easy way to do this, but with this amazing package, I no longer need to return a bool internal to the class of whether it was a success or not. Is there any way to return Result<_, int> something like that. I don't need to return anything if Success. I suppose it doesn't hurt or do anything to just return Result<bool, int> and just return true, but was hoping to just clean up the code a bit for readability.

Add Tests

• Add Tests

Integrate Codecov

• Integrate Codecov

Add null safety support

• Users want to use the package with dart 2.12.0+ and flutter 2.0.0+

We need to add support for null safety.

`result` doesn't return anything

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));
}

Cannot use with implicit-dynamic in analysis options

Describe the bug
It looks like I have to disable analysis that checks for implicit dynamic types in order to use this. Is this accurate? Is there a way to get around this?

To Reproduce
Example function:

Result<bool, Exception> test() {
  Success(true);
}

Expected behavior
No compiler errors or warnings

Actual behavior
Compiler error on call to Success:

(new) Success<bool, dynamic> Success(bool value)
package:result_type/src/success.dart

Missing type arguments for generic type 'Success<bool, dynamic>'.
Try adding an explicit type, or remove implicit-dynamic from your analysis options file.dart(implicit_dynamic_type)