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 - deleting property of prototype causes prototype index property not to be visited on an Array ---*/ function callbackfn(val, idx, obj) { return idx === 1 && typeof val === "undefined"; } var arr = [0, , 2]; Object.defineProperty(arr, "0", { get: function() { delete Array.prototype[1]; return 0; }, configurable: true }); Array.prototype[1] = 1; var testResult = arr.map(callbackfn); assert.sameValue(testResult.length, 3, 'testResult.length'); assert.sameValue(typeof testResult[1], "undefined", 'typeof testResult[1]');