Automatically Increase Array size Using JavaScript

<html>
    <body bgcolor="lightgreen">
        <h3>Automatically increases size of array </h3>
        <hr color="green">
            <p>Currently size of array is 3 ([1],[1],[2])</p>
            <head><script type="text/javascript">
var someArray = new Array();
alert(someArray.length);
someArray[0] = "A";
alert(someArray.length);
someArray[1] = "B";
alert(someArray.length);
someArray[2] = "C";
alert(someArray.length+" ----> This is the increased index i.e [3]...Now array size becomes 4");
</script>
        </head>
    </body>
</html>