Variables
JavaScript Variables
Variables are containers for storing data values. A variable can have different values at different phases of program execution.
Here, we use the var keyword to declare a variable. The variable name must be unique and further the value to the variable assigned by using the equal to (=) operator.
For example,
var x = 20; // Here variable x stores the value 20
JavaScript Variable names are case- sensitive
For example, var x and var X are two different naming variables.
There are different naming rules are as follows:
- Here, the first character must contain a letter, an underscore (_), or a dollar sign ($).
- Names must begin with a letter.
- Numbers are not allowed as the first letter but further names can contain numbers.
- JavaScript Names must not contain spaces.
Assignment Operator (=)
In JavaScript, the equal sign (=) is called the “assignment” operator, rather than an “equal to” operator.
Assignment operator mainly used to assign values to the variables.
For example,
x = 5 will assign the value 5 to x.
Code:
<html>
<head>
</head>
<body>
<script>
var x = 100;
document.write(x);
</script>
</body>
</html>
Here, the variable x assigns a value of 100 with the help of an assignment operator.
Output:
