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069e02ab47
Pick up the current branch head for V8 4.9 https://github.com/v8/v8/commit/1ecba0f PR-URL: https://github.com/nodejs/node/pull/4722 Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl> Reviewed-By: Michaël Zasso <mic.besace@gmail.com>
39 lines
1.4 KiB
JavaScript
39 lines
1.4 KiB
JavaScript
// Copyright 2015 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Flags: --noharmony-species
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// Before Symbol.species was added, ArrayBuffer subclasses constructed
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// ArrayBuffers, and Array subclasses constructed Arrays, but TypedArray and
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// Promise subclasses constructed an instance of the subclass.
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'use strict';
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assertEquals(undefined, Symbol.species);
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class MyArray extends Array { }
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let myArray = new MyArray();
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assertEquals(MyArray, myArray.constructor);
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assertEquals(Array, myArray.map(x => x + 1).constructor);
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assertEquals(Array, myArray.concat().constructor);
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class MyUint8Array extends Uint8Array { }
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Object.defineProperty(MyUint8Array.prototype, "BYTES_PER_ELEMENT", {value: 1});
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let myTypedArray = new MyUint8Array(3);
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assertEquals(MyUint8Array, myTypedArray.constructor);
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assertEquals(MyUint8Array, myTypedArray.map(x => x + 1).constructor);
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class MyArrayBuffer extends ArrayBuffer { }
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let myBuffer = new MyArrayBuffer(0);
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assertEquals(MyArrayBuffer, myBuffer.constructor);
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assertEquals(ArrayBuffer, myBuffer.slice().constructor);
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class MyPromise extends Promise { }
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let myPromise = new MyPromise(() => {});
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assertEquals(MyPromise, myPromise.constructor);
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assertEquals(MyPromise, myPromise.then().constructor);
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// However, subarray instantiates members of the parent class
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assertEquals(Uint8Array, myTypedArray.subarray(1).constructor);
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