JS Variable
JavaScript Variable
A JavaScript variable is simply a name of storage location. There are two types of variables in JavaScript : local variable and global variable.
There are some rules while declaring a JavaScript variable (also known as identifiers).
- Name must start with a letter (a to z or A to Z), underscore( _ ), or dollar( $ ) sign.
- After first letter we can use digits (0 to 9), for example value1.
- JavaScript variables are case sensitive, for example x and X are different variables.
Correct JavaScript variables
var x = 10;
var _value="sonoo";
Incorrect JavaScript variables
var 123=30;
var *aa=320;
Example of JavaScript variable
Let’s see a simple example of JavaScript variable.
Output of the above example
JavaScript local variable
A JavaScript local variable is declared inside block or function. It is accessible within the function or block only. For example:
OR
JavaScript global variable
A JavaScript global variable is accessible from any function. A variable i.e. declared outside the function or declared with window object is known as global variable. For example:
