Declaring Variables

Like C++ or Java , in JavaScript we do not have to declare a variable’s type when we define it.

Rather JavaScript allows us to store any value in a variable .

Syatax

var  <var name>;

OR

var <var name>=<value>

Declaring Variables

// declaring one javascript variable

var firstName;

// declaring multiple javascript variables

var firstName, lastName;

// declaring and assigning one javascript variable

var firstName = ‘Nishant’;

// declaring and assigning multiple javascript variables

var firstName = ‘Sachin’, lastName = ‘Gupta’;

Variables Decl Rules

1. Variable names must begin with a letter and can have digits also.
2. Variable names can also begin with $ and _
3. Variable names are case sensitiveDefault value of a variable is “undefined”

Displaying Variable