Arrays tutorial in JavaScript

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<head>
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    <title>Arrays JavaScript</title>
    <script>
        var ary = [10, 20, 30, 40, 50];
        var aryTwo = [10, "Harry", "Hello", true, null];
        var sum = 0;
        document.write(ary + "<br>");
        document.write(ary[2] + "<br>");
        document.write(ary[4] + "<br>");
        document.write(ary[8] + "<br>");
        document.write("<br><br>");
        document.write("<ul>");
        for (var a = 0; a < ary.length; a++) {
            document.write("<li>" + ary[a] + "</li>");
            sum = sum + ary[a];
        }
        document.write("</ul>");
        document.write("Sum is : " + sum + "<br><br>");
        document.write("<ul>");
        for (var b = 0; b < aryTwo.length; b++) {
            document.write("<li>" + aryTwo[b] + "</li>");
        }
        document.write("</ul>");
    </script>
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<body>
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