JSTests/test262/test/built-ins/Array/prototype/filter/15.4.4.20-3-22.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.filter
es5id: 15.4.4.20-3-22
description: >
    Array.prototype.filter throws TypeError exception when 'length' is
    an object with toString and valueOf methods that don�t return
    primitive values
---*/

        var accessed = false;
        var firstStepOccured = false;
        var secondStepOccured = false;

        function callbackfn(val, idx, obj) {
            accessed = true;
            return true;
        }

        var obj = {
            1: 11,
            2: 12,

            length: {
                valueOf: function () {
                    firstStepOccured = true;
                    return {};
                },
                toString: function () {
                    secondStepOccured = true;
                    return {};
                }
            }
        };
assert.throws(TypeError, function() {
            Array.prototype.filter.call(obj, callbackfn);
});
assert.sameValue(accessed, false, 'accessed');
assert(firstStepOccured, 'firstStepOccured !== true');
assert(secondStepOccured, 'secondStepOccured !== true');