JSTests/test262/test/built-ins/Array/prototype/some/15.4.4.17-7-b-11.js

// 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.some
es5id: 15.4.4.17-7-b-11
description: >
    Array.prototype.some - deleting property of prototype causes
    prototype index property not to be visited on an Array
---*/

        var accessed = false;
        function callbackfn(val, idx, obj) {
            accessed = true;
            return idx === 1;
        }
        var arr = [0, , 2];

        Object.defineProperty(arr, "0", {
            get: function () {
                delete Array.prototype[1];
                return 0;
            },
            configurable: true
        });

            Array.prototype[1] = 1;

assert.sameValue(arr.some(callbackfn), false, 'arr.some(callbackfn)');
assert(accessed, 'accessed !== true');