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1 // Copyright 2015 the V8 project authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 // Flags: --noharmony-species | |
6 | |
7 // Before Symbol.species was added, ArrayBuffer subclasses constructed | |
8 // ArrayBuffers, and Array subclasses constructed Arrays, but TypedArray and | |
9 // Promise subclasses constructed an instance of the subclass. | |
10 | |
11 'use strict'; | |
12 | |
13 assertEquals(undefined, Symbol.species); | |
14 | |
15 class MyArray extends Array { } | |
16 let myArray = new MyArray(); | |
17 assertEquals(MyArray, myArray.constructor); | |
18 assertEquals(Array, myArray.map(x => x + 1).constructor); | |
19 assertEquals(Array, myArray.concat().constructor); | |
20 | |
21 class MyUint8Array extends Uint8Array { } | |
22 Object.defineProperty(MyUint8Array.prototype, "BYTES_PER_ELEMENT", {value: 1}); | |
23 let myTypedArray = new MyUint8Array(3); | |
24 assertEquals(MyUint8Array, myTypedArray.constructor); | |
25 assertEquals(MyUint8Array, myTypedArray.map(x => x + 1).constructor); | |
26 | |
27 class MyArrayBuffer extends ArrayBuffer { } | |
28 let myBuffer = new MyArrayBuffer(0); | |
29 assertEquals(MyArrayBuffer, myBuffer.constructor); | |
30 assertEquals(ArrayBuffer, myBuffer.slice().constructor); | |
31 | |
32 class MyPromise extends Promise { } | |
33 let myPromise = new MyPromise(() => {}); | |
34 assertEquals(MyPromise, myPromise.constructor); | |
35 assertEquals(MyPromise, myPromise.then().constructor); | |
36 | |
37 // However, subarray instantiates members of the parent class | |
38 assertEquals(Uint8Array, myTypedArray.subarray(1).constructor); | |
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