Cast javascript object to array. How to?

I have made this sandbox test:

<html>
    <head>
        <title>whatever</title>
        <script type="text/javascript">
            function myLittleTest() {
                var obj, arr, armap;

                arr = [1, 2, 3, 5, 7, 11];

                obj = {};
                obj = arr;
                alert (typeof arr);
                alert (typeof obj);

                // doesn't work in IE
                armap = obj.map(function (x) { return x * x; });
                alert (typeof armap);

            }
            myLittleTest();
        </script>
    </head>
    <body>
    </body>
</html>

I realize I can use jQuery's function $.map for making that line of code work, but, what am I missing on javascript datatypes?

Cast javascript object to array. How to?

6 Answers