dart oop behavioral, iterator

iterator.dart

// Copyright 2024 Fredrick Allan Grott. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.


import 'package:iterator/rainbow_iterator.dart';

void main() {
  var rainbowColors = RainbowIterator();
  while (rainbowColors.moveNext()) {
    print(rainbowColors.current);
  }

  /*
    Red
    Orange
    Yellow
    Green
    Blue
    Indigo
    Violet
  */
}

rainbow_iterator.dart

// Copyright 2024 Fredrick Allan Grott. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

class RainbowIterator implements Iterator {
  final _colors = ["Red", "Orange", "Yellow", "Green", "Blue", "Indigo", "Violet"];
  var _index = 0;
  @override
  String get current => _colors[_index++];
  @override
  bool moveNext() => _index < _colors.length;
}