rust_core 0.4.0

Idiomatic Dart programming with predictable control flow, based off Rust's core library. Includes types like Result, Option, Cells, and extensive methods/extensions.

example/main.dart

import 'package:rust_core/result.dart';

void main() {
  usingTheEarlyReturnKey();
  usingRegularPatternMatching();
}

Result<int, String> usingTheEarlyReturnKey() => Result(($) {
      // Early Return Key
      // Will return here with 'Err("error")'
      int x = willAlwaysReturnErr()[$].toInt();
      return Ok(x);
    });

Result<int, String> usingRegularPatternMatching() {
  int x;
  switch (willAlwaysReturnErr()) {
    case Err(:final err):
      return Err(err);
    case Ok(:final ok):
      x = ok.toInt();
  }
  return Ok(x);
}

Result<double, String> willAlwaysReturnErr() => Err("error");