| // Copyright (C) 2015 the V8 project authors. All rights reserved. |
| // This code is governed by the BSD license found in the LICENSE file. |
| /*--- |
| es6id: 23.1.3.9 |
| description: > |
| Throws a TypeError if `this` is a WeakMap object. |
| info: | |
| get Map.prototype.size |
| |
| 1. Let M be the this value. |
| 2. If Type(M) is not Object, throw a TypeError exception. |
| 3. If M does not have a [[MapData]] internal slot, throw a TypeError |
| exception. |
| ... |
| features: [WeakMap] |
| ---*/ |
| |
| var descriptor = Object.getOwnPropertyDescriptor(Map.prototype, 'size'); |
| |
| var map = new Map(); |
| |
| // Does not throw |
| descriptor.get.call(map); |
| |
| assert.throws(TypeError, function() { |
| descriptor.get.call(new WeakMap()); |
| }); |
