| /* |
| * 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 E singleWhere(bool test(E value)) |
| * Returns the single element that satisfies [test]. |
| * Checks all elements to see if [test(element)] returns [true]. |
| * @description Checks that the single element that satisfies the given |
| * predicate [test] |
| * is returned. |
| * @author kaigorodov |
| */ |
| import "dart:collection"; |
| import "../../../Utils/expect.dart"; |
| |
| check(List a, bool test(value), int expected) { |
| DoubleLinkedQueue queue = new DoubleLinkedQueue.from(a); |
| int actual = queue.singleWhere(test) as int; |
| Expect.equals(expected, actual); |
| } |
| |
| main() { |
| check([1, 2, -3, 0], (value) => value > 1, 2); |
| check(const[1, 2, -5, -6], (value) => value == 1, 1); |
| } |