| // 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> where(bool test(E element)) |
| /// ... |
| /// Iterating will not cache results, and thus iterating multiple times over the |
| /// returned [Iterable] may invoke the supplied function [test] multiple times on |
| /// the same element. |
| /// @description Checks that iterating multiple times over the returned |
| /// [Iterable] will invoke the supplied function [test] multiple times on the |
| /// same element. |
| /// @author msyabro |
| |
| |
| import "dart:typed_data"; |
| import "../../../Utils/expect.dart"; |
| |
| main() { |
| var count = 0; |
| bool test(int e) { |
| ++count; |
| return true; |
| } |
| |
| var list = new Int64List.fromList([1, 2, 3]); |
| var res = list.where(test); |
| |
| res.elementAt(0); |
| Expect.equals(1,count); |
| |
| res.elementAt(0); |
| Expect.equals(2,count); |
| |
| res.elementAt(1); |
| Expect.equals(4,count); |
| |
| res.elementAt(2); |
| Expect.equals(7,count); |
| } |