| /* |
| * Copyright (c) 2013, 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)) |
| * ... |
| * The filtering happens lazily. |
| * @description Checks that [test] is not invoked until returned [Iterable] is |
| * not iterated. |
| * @author msyabro |
| */ |
| |
| import "dart:typed_data"; |
| import "../../../Utils/expect.dart"; |
| |
| main() { |
| var count = 0; |
| bool test(int e) { |
| ++count; |
| return true; |
| } |
| |
| var list = new Uint64List.fromList([1, 2, 3]); |
| var res = list.takeWhile(test); |
| Expect.equals(0, count); |
| res.elementAt(0); |
| Expect.equals(1, count); |
| } |