| // Copyright (C) 2015 the V8 project authors. All rights reserved. |
| // This code is governed by the BSD license found in the LICENSE file. |
| /*--- |
| es6id: 23.1.1.1 |
| description: > |
| Returns the new Map object with the new empty list if the iterable argument is |
| undefined. |
| info: | |
| Map ( [ iterable ] ) |
| |
| ... |
| 2. Let map be OrdinaryCreateFromConstructor(NewTarget, "%MapPrototype%", |
| «[[MapData]]» ). |
| ... |
| 4. Map map’s [[MapData]] internal slot to a new empty List. |
| 5. If iterable is not present, let iterable be undefined. |
| 6. If iterable is either undefined or null, let iter be undefined. |
| ... |
| 8. If iter is undefined, return map. |
| ---*/ |
| |
| var m1 = new Map(); |
| var m2 = new Map(undefined); |
| var m3 = new Map(null); |
| |
| assert.sameValue(m1.size, 0, 'The value of `new Map().size` is `0`'); |
| assert.sameValue(m2.size, 0, 'The value of `new Map(undefined).size` is `0`'); |
| assert.sameValue(m3.size, 0, 'The value of `new Map(null).size` is `0`'); |
| |
| assert(m1 instanceof Map); |
| assert(m2 instanceof Map); |
| assert(m3 instanceof Map); |
