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/**
 * @path chapter15/15.4/15.4.4/15.4.4.20/15.4.4.20-2-15.js
 * @description Array.prototype.filter - 'length' is property of the global object
 */


function testcase() {
       
        function callbackfn(val, idx, obj) {
            return  obj.length === 2;
        }

        try {
            var oldLen = fnGlobalObject().length;
            fnGlobalObject()[0] = 12;
            fnGlobalObject()[1] = 11;
            fnGlobalObject()[2] = 9;
            fnGlobalObject().length = 2;
            var newArr = Array.prototype.filter.call(fnGlobalObject(), callbackfn);
            return newArr.length === 2;
        } finally {
            delete fnGlobalObject()[0];
            delete fnGlobalObject()[1];
            delete fnGlobalObject()[2];
            fnGlobalObject().length = oldLen;
        }
    }
runTestCase(testcase);