JSTests/test262/test/built-ins/Array/prototype/map/15.4.4.19-3-20.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.map
es5id: 15.4.4.19-3-20
description: >
    Array.prototype.map - value of 'length' is an Object which has an
    own valueOf method
---*/

        function callbackfn(val, idx, obj) {
            return val < 10;
        }

        var obj = {
            0: 11,
            1: 9,

            length: {
                valueOf: function () {
                    return 2;
                }
            }
        };

        var newArr = Array.prototype.map.call(obj, callbackfn);

assert.sameValue(newArr.length, 2, 'newArr.length');