| // Copyright (C) 2017 Leo Balter. All rights reserved. |
| // This code is governed by the BSD license found in the LICENSE file. |
| |
| /*--- |
| esid: sec-array.prototype.unshift |
| description: > |
| The "length" property of Array.prototype.unshift |
| info: | |
| 22.1.3.29 Array.prototype.unshift ( ...items ) |
| |
| The length property of the unshift method is 1. |
| |
| 17 ECMAScript Standard Built-in Objects |
| |
| Every built-in function object, including constructors, has a length property |
| whose value is an integer. Unless otherwise specified, this value is equal to |
| the largest number of named arguments shown in the subclause headings for the |
| function description. Optional parameters (which are indicated with brackets: |
| [ ]) or rest parameters (which are shown using the form «...name») are not |
| included in the default argument count. |
| |
| Unless otherwise specified, the length property of a built-in function object |
| has the attributes { [[Writable]]: false, [[Enumerable]]: false, |
| [[Configurable]]: true }. |
| includes: [propertyHelper.js] |
| ---*/ |
| |
| assert.sameValue(Array.prototype.unshift.length, 1); |
| |
| verifyNotEnumerable(Array.prototype.unshift, 'length'); |
| verifyNotWritable(Array.prototype.unshift, 'length'); |
| verifyConfigurable(Array.prototype.unshift, 'length'); |