22 lines
846 B
JavaScript
22 lines
846 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 str1 = new String("yuck\uD83D\uDCA9")
|
||
|
|
// String wrapper objects are not concat-spreadable by default
|
||
|
|
assertEquals([str1], [].concat(str1));
|
||
|
|
|
||
|
|
// String wrapper objects may be individually concat-spreadable
|
||
|
|
str1[Symbol.isConcatSpreadable] = true;
|
||
|
|
assertEquals(["y", "u", "c", "k", "\uD83D", "\uDCA9"],
|
||
|
|
[].concat(str1));
|
||
|
|
|
||
|
|
String.prototype[Symbol.isConcatSpreadable] = true;
|
||
|
|
// String wrapper objects may be concat-spreadable
|
||
|
|
assertEquals(["y", "u", "c", "k", "\uD83D", "\uDCA9"],
|
||
|
|
[].concat(new String("yuck\uD83D\uDCA9")));
|
||
|
|
|
||
|
|
// String values are never concat-spreadable
|
||
|
|
assertEquals(["yuck\uD83D\uDCA9"], [].concat("yuck\uD83D\uDCA9"));
|