OLD | NEW |
(Empty) | |
| 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); |
OLD | NEW |