fb5cbc2e2d
This patch adds the basis for subclassing TypedArrays, Arrays and ArrayBuffers through the @@species hook, added in ES2015. This is the first patch in a series. This patch simply defines the @@species Symbol and installs it on the appropriate constructors. The behavior is guarded behind the --harmony-species flag. R=cbruni BUG=v8:4093 LOG=Y CQ_INCLUDE_TRYBOTS=tryserver.chromium.linux:linux_chromium_rel_ng;tryserver.blink:linux_blink_rel TBR=hpayer@chromium.org Review URL: https://codereview.chromium.org/1558543002 Cr-Commit-Position: refs/heads/master@{#33095}
38 lines
1.4 KiB
JavaScript
38 lines
1.4 KiB
JavaScript
// Copyright 2015 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.
|
|
|
|
// Flags: --harmony-species
|
|
|
|
// Test the ES2015 @@species feature
|
|
|
|
'use strict';
|
|
|
|
let TypedArray = Uint8Array.__proto__;
|
|
|
|
// The @@species property exists on the right objects and has the right values
|
|
|
|
let classesWithSpecies = [RegExp, Array, TypedArray, ArrayBuffer, Map, Set, Promise];
|
|
let classesWithoutSpecies = [Object, Function, String, Number, Symbol, WeakMap, WeakSet];
|
|
|
|
for (let constructor of classesWithSpecies) {
|
|
assertEquals(constructor, constructor[Symbol.species]);
|
|
assertThrows(function() { constructor[Symbol.species] = undefined }, TypeError);
|
|
let descriptor = Object.getOwnPropertyDescriptor(constructor, Symbol.species);
|
|
assertTrue(descriptor.configurable);
|
|
assertFalse(descriptor.enumerable);
|
|
assertEquals(undefined, descriptor.writable);
|
|
assertEquals(undefined, descriptor.set);
|
|
assertEquals('function', typeof descriptor.get);
|
|
}
|
|
|
|
// @@species is defined with distinct getters
|
|
assertEquals(classesWithSpecies.length,
|
|
new Set(classesWithSpecies.map(constructor =>
|
|
Object.getOwnPropertyDescriptor(
|
|
constructor, Symbol.species).get)
|
|
).size);
|
|
|
|
for (let constructor of classesWithoutSpecies)
|
|
assertEquals(undefined, constructor[Symbol.species]);
|