| // Copyright (c) 2017, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| /// @assertion Iterable<E> takeWhile(bool test(E value)) |
| /// Every new iterator of the returned iterable starts iterating over the |
| /// elements of this. |
| /// @description Checks that every new iterator starts iterating over the |
| /// elements of this. |
| /// @author iarkh@unipro.ru |
| |
| import "dart:collection"; |
| import "../../../Utils/expect.dart"; |
| |
| class MyIterable<int> extends Object with IterableMixin { |
| List _content; |
| MyIterable(List list): _content = list; |
| |
| Iterator get iterator { |
| return _content.iterator; |
| } |
| } |
| |
| void check(List list, bool test0(var element)) { |
| IterableMixin iterable = new MyIterable(list); |
| var el; |
| |
| bool test(var element) { |
| if(test0(element)) { |
| el = element; |
| return true; |
| } else { |
| return false; |
| } |
| } |
| |
| Iterable res = iterable.takeWhile(test); |
| |
| for (int k = 0; k < 5; k++) { |
| Iterator it = res.iterator; |
| int i = 0; |
| while (it.moveNext()) { |
| Expect.equals(list[i], el); |
| Expect.equals(el, it.current); |
| i++; |
| } |
| } |
| } |
| |
| main() { |
| List list = [1, 3, 7, 4, 5, 6]; |
| check(list, (var element) => element == 1); |
| check(list, (var element) => true); |
| check(list, (var element) => false); |
| check(list, (var element) => element > 4); |
| check(list, (var element) => element < 4); |
| check(list, (var element) => element == 4); |
| } |