| // Copyright (c) 2012, 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. |
| |
| // @dart = 2.9 |
| |
| import "package:expect/expect.dart"; |
| |
| var myIdentical = identical; |
| |
| class Point { |
| num x, y; |
| Point(this.x, this.y); |
| } |
| |
| main() { |
| // int. |
| Expect.isTrue(myIdentical(42, 42)); |
| Expect.isFalse(myIdentical(42, 41)); |
| |
| // double. |
| Expect.isTrue(myIdentical(42.0, 42.0)); |
| Expect.isFalse(myIdentical(42.0, 41.0)); |
| |
| // Mint (2^45). |
| Expect.isTrue(myIdentical(35184372088832, 35184372088832)); |
| Expect.isFalse(myIdentical(35184372088832, 35184372088831)); |
| |
| // Different types. |
| Expect.isFalse(myIdentical("hello", 41)); |
| |
| // Points. |
| var p = new Point(1, 1); |
| var q = new Point(1, 1); |
| Expect.isFalse(myIdentical(p, q)); |
| |
| // Strings. |
| var a = "hello"; |
| var b = "hello"; |
| // Identical strings are coalesced into single instances. |
| Expect.isTrue(myIdentical(a, b)); |
| |
| // Null handling. |
| Expect.isFalse(myIdentical(42, null)); |
| Expect.isTrue(myIdentical(null, null)); |
| } |