Strict mode Passingnon-Strict mode Passing
Features:
- ∅
// Copyright (c) 2012 Ecma International. All rights reserved. // This code is governed by the BSD license found in the LICENSE file. /*--- esid: sec-array.prototype.map description: > Array.prototype.map - decreasing length of array causes index property not to be visited ---*/ function callbackfn(val, idx, obj) { return idx === 3 && typeof val === "undefined"; } var arr = [0, 1, 2, "last"]; Object.defineProperty(arr, "0", { get: function() { arr.length = 3; return 0; }, configurable: true }); var testResult = arr.map(callbackfn); assert.sameValue(typeof testResult[3], "undefined", 'typeof testResult[3]');