Declare a Variable in JavaScipt Example

Updated on August 13, 2015     Kisan Patel

In JavaScirpt we can declare the variable using the reserved word var. The value of this variable can be any thing; it can be numeric or it can be string or it can be a Boolean value.

var c = "Hello";

Variables are case sensitive and must start with an alphabet letter or a underscore (_).

var firstName;
var siteName = "C#";
lastName = "Code";
document.write(siteName + " " + lastName);

In the above code snippet
The 1^st line declares the firstName variable.
The 2^nd line declares the siteName variable and assign value.
The 3^rd line assigns a value to undeclared variable that automatically creates a valid variable.