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Multiple results for dart. Inspired by dartz's Either and Kotlin's sealed classes

multiple_result #

Result package for dart inspired by the work of dartz's Either and Kotlin's sealed classes.

This package is perfect to those of you who just want the Multiple results functionality from dartz. 👌

Old version:

If you're looking for a non null-safety version, you can find it in here

How to use it #

In the return of a function, set it to return a Result type;

Result getSomethingPretty();

then add the Error and the Success types.


Result<Exception, String> getSomethingPretty() {

}

in return of the function, you just need to return

return Success('Something Pretty');

or

return Error(Exception('something ugly happened...'));

The function should look something like this:


Result<Exception, String> getSomethingPretty() {
    if(isOk) {
        return Success('OK!');
    } else {
        return Error(Exception('Not Ok!'));
    }
}

Handling the Result with when

void main() {
    final result = getSomethingPretty();
     final String message = result.when(
         (error) {
          // handle the error here
          return "error";
        }, (success) {
          // handle the success here
          return "success";
        },
    );

}

Handling the Result with get

void main() {
    final result = getSomethingPretty();

    String? mySuccessResult;
    if (result.isSuccess()) {
      mySuccessResult = result.get();
    }
}

Handling the Result with getSuccess

void main() {
    final result = getSomethingPretty();

    String? mySuccessResult;
    if (result.isSuccess()) {
      mySuccessResult = result.getSuccess();
    }
}

Handling the Result with getError

void main() {
    final result = getSomethingPretty();

    Exception? myException;
    if (result.isError()) {
      myException = result.getError();
    }
}
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Multiple results for dart. Inspired by dartz's Either and Kotlin's sealed classes

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Icon for licenses.MIT (LICENSE)

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