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deps/v8/test/mjsunit/harmony/array-flatMap-species.js
29 строк
727 B
Ujjwal Sharma
deps: update V8 to 7.4.288.13
28 мар 2019, 23:36
28 мар 2019, 23:36
f579e11
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// Copyright 2018 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. { class MyArray extends Array { static get [Symbol.species]() { return Array; } } const wannabe = new MyArray(); const result = wannabe.flatMap(x => [x, x]); assertEquals(false, result instanceof MyArray); assertEquals(true, result instanceof Array); } { class MyArray extends Array { static get [Symbol.species]() { return this; } } const wannabe = new MyArray(); const result = wannabe.flatMap(x => [x, x]); assertEquals(true, result instanceof MyArray); assertEquals(true, result instanceof Array); }