Share on Google+Share on Google+

JavaScript Variables

Advertisement
JavaScript Variables: In this tutorial you will come to know about how to declare variables, how to display the values of a variable, what is the meaning of dynamic typing of variables in JavaScript.

JavaScript Variables:

Variables are like containers, which contains a value. In JavaScript variables dependent on the value, not on the datatype that means variables are of  dynamic typing. Variable names are case-sensitive and this should be start with either a letter or underscore.

We can use var statement  to declare a variable as follows.

var x;

var variable;

We can assign any type of value at the time of declaration like:

var x=23;

var variable="string";

We can ignore  the var statement at declaration time by assigning value to a variable.

x=23;

variable="string";

is same as the above given example

Example 1:

<html>
<head>
<title>
Variables in JavaScript
</title>
</head>
<body>
<script type="text/javascript">
var x=12;
document.write("Value of x is " + x);
y="String";
document.write("<br/> Value of y is " + y);
x="String type value";
document.write("<br/>New value of x is " + x);
y=343;
document.write("<br/>New value of y is " + y);
</script>
</body>
</html>

Output:

Value of x is 12
Value of y is String
New value of x is String type value
New value of y is 343

Advertisements

Posted on: November 6, 2009 If you enjoyed this post then why not add us on Google+? Add us to your Circles

Share this Tutorial Follow us on Twitter, or add us on Facebook or Google Plus to keep you updated with the recent trends of Java and other open source platforms.