27 lines
896 B
JavaScript
27 lines
896 B
JavaScript
|
// Copyright 2014 the V8 project authors. All rights reserved.
|
||
|
|
// Use of this source code is governed by a BSD-style license that can be
|
||
|
|
// found in the LICENSE file.
|
||
|
|
|
||
|
|
"use strict";
|
||
|
|
var num = new Number(true)
|
||
|
|
// Number wrapper objects are not concat-spreadable by default
|
||
|
|
assertEquals([num], [].concat(num));
|
||
|
|
|
||
|
|
// Number wrapper objects may be individually concat-spreadable
|
||
|
|
num[Symbol.isConcatSpreadable] = true;
|
||
|
|
num.length = 3;
|
||
|
|
num[0] = 1, num[1] = 2, num[2] = 3;
|
||
|
|
assertEquals([1, 2, 3], [].concat(num));
|
||
|
|
|
||
|
|
Number.prototype[Symbol.isConcatSpreadable] = true;
|
||
|
|
// Number wrapper objects may be concat-spreadable
|
||
|
|
assertEquals([], [].concat(new Number(123)));
|
||
|
|
Number.prototype[0] = 1;
|
||
|
|
Number.prototype[1] = 2;
|
||
|
|
Number.prototype[2] = 3;
|
||
|
|
Number.prototype.length = 3;
|
||
|
|
assertEquals([1,2,3], [].concat(new Number(123)));
|
||
|
|
|
||
|
|
// Number values are never concat-spreadable
|
||
|
|
assertEquals([true], [].concat(true));
|