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deps/v8/test/mjsunit/es6/array-concat-unspreadable-arraylike-proxy.js
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Matheus Marchini
deps: update V8 to 8.1.307.20
19 мар 2020, 02:23
Не верифицирован
19 мар 2020, 02:23
2883c85
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// Copyright 2014 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. // Note: concat does not currently support species so there is no difference // between [].concat(foo) and Array.prototype.concat.apply(foo). var log = []; var logger = {}; var handler = new Proxy({}, logger); logger.get = function(t, trap, r) { return function(...args) { log.push([trap, ...args]); return Reflect[trap](...args); } }; var target = ["a", "b"]; target[Symbol.isConcatSpreadable] = ""; var obj = new Proxy(target, handler); log.length = 0; assertEquals([obj], [].concat(obj)); assertEquals(1, log.length); for (var i in log) assertSame(target, log[i][1]); assertEquals(["get", target, Symbol.isConcatSpreadable, obj], log[0]); log.length = 0; assertEquals([obj], Array.prototype.concat.apply(obj)); assertEquals(2, log.length); // An extra read for the constructor for (var i in log) assertSame(target, log[i][1]); assertEquals(["get", target, "constructor", obj], log[0]); assertEquals(["get", target, Symbol.isConcatSpreadable, obj], log[1]);