Data Type in JavaScript
- 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 .
- 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’;
Syatax
var <var name>;
OR
var <var name>=<value>
Variables Decl Rules
-
Variable names must begin with a letter and can have digits also.
-
Variable names can also begin with $ and _
- Variable names are case sensitiveDefault value of a variable is “undefined”
Displaying Variable
To display a variables value we just have to pass it’s name to the document.write( ) method.
For Example
var a=10;
document.write(a);
To print a variable’s value with some text we use operator “ + “
For Example
var a=10;
document.write(‘Value of a is ‘+a);