| // 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 V putIfAbsent(K key, V ifAbsent()) |
| /// If [key] is not associated to a value, calls [ifAbsent] and |
| /// updates the map by mapping [key] to the value returned by [ifAbsent]. |
| /// Returns the value in the map. |
| /// @description Checks that the new mapping added only if the key is not present |
| /// in the map. Checks the returned value. |
| /// @author msyabro |
| |
| library putIfAbsent_A01_t01; |
| |
| import "../../../Utils/expect.dart"; |
| |
| test(Map create([Map content])) { |
| Map map = create(); |
| int i = 1; |
| |
| Object putIfAbsent() { |
| return i; |
| } |
| |
| Expect.isTrue(map.putIfAbsent("1", putIfAbsent) == 1); |
| Expect.isTrue(map["1"] == 1); |
| |
| i = 2; |
| |
| Expect.isTrue( map.putIfAbsent("1", putIfAbsent) == 1); |
| Expect.isTrue(map["1"] == 1); |
| } |