24 lines
750 B
JavaScript
24 lines
750 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 re = /abc/;
|
||
|
|
// RegExps are not concat-spreadable by default
|
||
|
|
assertEquals([re], [].concat(re));
|
||
|
|
|
||
|
|
// RegExps may be individually concat-spreadable
|
||
|
|
re[Symbol.isConcatSpreadable] = true;
|
||
|
|
re[0] = 1, re[1] = 2, re[2] = 3, re.length = 3;
|
||
|
|
assertEquals([1, 2, 3], [].concat(re));
|
||
|
|
|
||
|
|
// RegExps may be concat-spreadable
|
||
|
|
RegExp.prototype[Symbol.isConcatSpreadable] = true;
|
||
|
|
RegExp.prototype.length = 3;
|
||
|
|
|
||
|
|
assertEquals([void 0, void 0, void 0], [].concat(/abc/));
|
||
|
|
RegExp.prototype[0] = 1;
|
||
|
|
RegExp.prototype[1] = 2;
|
||
|
|
RegExp.prototype[2] = 3;
|
||
|
|
assertEquals([1,2,3], [].concat(/abc/));
|