| // 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 void retainWhere(bool test(E element)) |
| /// Removes all elements not matched by [test] from the queue. |
| /// @description Checks that all elements that satisfy test are left, and |
| /// elements that does not are removed. |
| /// @author kaigorodov |
| |
| import "dart:collection"; |
| import "../../../Utils/expect.dart"; |
| |
| void check(List a0, bool test(var element)) { |
| DoubleLinkedQueue queue = new DoubleLinkedQueue.from(a0); |
| queue.retainWhere(test); |
| int k = 0; |
| for (int k0 = 0; k0 < a0.length; k0++) { |
| if (test(a0[k0])) { |
| Expect.identical(a0[k0], queue.elementAt(k), "k0=$k0, k=$k"); |
| k++; |
| } |
| } |
| Expect.equals(queue.length, k, "queue.length=${queue.length} k=$k"); |
| } |
| |
| main() { |
| List a0 = [1, 3, 3, 4, 5, 6]; |
| 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); |
| } |