JSTests/test262/test/built-ins/Array/prototype/map/15.4.4.19-3-21.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: 15.4.4.19-3-21
description: >
    Array.prototype.map - 'length' is an object that has an own
    valueOf method that returns an object and toString method that
    returns a string
---*/

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

        var firstStepOccured = false;
        var secondStepOccured = false;
        var obj = {
            0: 11,
            1: 9,

            length: {
                valueOf: function () {
                    firstStepOccured = true;
                    return {};
                },
                toString: function () {
                    secondStepOccured = true;
                    return '2';
                }
            }
        };

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

assert.sameValue(newArr.length, 2, 'newArr.length');
assert(firstStepOccured, 'firstStepOccured !== true');
assert(secondStepOccured, 'secondStepOccured !== true');