| // Copyright (c) 2011, 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 abstract Iterable<E> takeWhile(bool test(E value)) |
| /// The elements can be computed by stepping through iterator until an element is |
| /// found where [test(element)] is [false]. At that point, the returned iterable |
| /// stops (its [moveNext()] returns [false]). |
| /// @author kaigorodov |
| |
| import "dart:collection"; |
| import "../../../Utils/expect.dart"; |
| |
| void check(List a, bool test(var element)) { |
| DoubleLinkedQueue queue = new DoubleLinkedQueue.from(a); |
| int last = 0; |
| for (var element in queue.takeWhile(test)) { |
| Expect.equals(a[last], element); |
| Expect.isTrue(test(element)); |
| last++; |
| } |
| if (last < a.length) { |
| Expect.isFalse(test(a[last])); |
| } |
| } |
| |
| main() { |
| List a0 = [1, 3, 7, 4, 5, 6]; |
| check(a0, (var element) => element == 1); |
| check(a0, (var element) => true); |
| check(a0, (var element) => false); |
| check(a0, (var element) => element > 4); |
| check(a0, (var element) => element < 4); |
| check(a0, (var element) => element == 4); |
| } |