<!-- javaScript variables can hold many data types: numbers, strings, arrays, objects and more: -->

<script type="text/javascript">
    var n = 10; // n is number datatype
    document.write(n,"<br>");
</script>

<script type="text/javascript">
    //strings datatype

    var s = "Rohit"; // s is strings datatype
    document.write(s,"<br>");
</script>

<!--arrays datatype-->
<p id = "demo"></p>
<script>
    var a = ["Bumrah", 'arrsys', 123, 12.12];
    document.getElementById("demo").innerHTML = a[0];
</script>


<!--object datatype -->
<script type="text/javascript">
    var x = {firstname:"milan", secondname:"bakotra"};//x is object
    document.write(x.firstname,"  ",x.secondname, "<br>");//firstname and second name is properties
</script>