| // Copyright (c) 2016, 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 |
| /// Description Operator Associativity Precedence |
| /// If-null ?? Left 4 |
| /// @description Test that '??' if-null operator has left associativity |
| /// @author sgrekhov@unipro.ru |
| |
| import "../../../Utils/expect.dart"; |
| |
| String log = ""; |
| |
| class C { |
| getNull(String val) { |
| log += val; |
| return null; |
| } |
| |
| bool getTrue(String val) { |
| log += val; |
| return true; |
| } |
| |
| bool getFalse(String val) { |
| log += val; |
| return false; |
| } |
| } |
| |
| main() { |
| C c = new C(); |
| |
| var v = c.getNull("c0") ?? c.getNull("c1") ?? c.getTrue("c2") ?? c.getFalse("c3"); |
| Expect.isTrue(v); |
| Expect.equals("c0c1c2", log); |
| } |
| |