Rusted

• Rust-inspired Result class in Dart with 2 options: Ok or Err with intuitive methods for asynchronous programming.
• Extensions for duration

Usage

Result

A simple usage example:

import 'package:rusted/rusted.dart';

void main() {
  Result<String, Exception> result = Ok('hi');
  result.fold(
    (ok) => print(ok),
    (err) => print(err),
  );
}

Time

await Future.delayed(1.5.minutes);

await Future.delayed(5.seconds);

await Future.delayed(250.milliseconds);

Motive

Since Dart doesn't provide a class similiar to Rust's Result, this package was made to fill that purpose.

A result is especially useful in situations where catching errors isn't desirable, such as in the mapEventToState function of a Bloc, when it is much better to handle errors in the repository, making refactoring of the Bloc easier.

With Result it is easier to deliver errors to the UI while forcing you to handle them.

Dartz is a great functional programming package which uses an Either class. Unfortunately it is not documented at all and can be a bit confusing.

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Features and bugs

Please file feature requests and bugs at the issue tracker.

Libraries

rusted