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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).

• Variables are the identifiers to store data values in our code.
• var is the keyword to declare a variable.
• ‘=’ is the operator to assign a value to a variable.
• A variable must start with _ or $ or letter. 99temp is invalid whereas _99temp is valid.
• In ES2015(known as ECMAscript), two other ways to declare variables were introduced- let and const. We can use these 2 keywords to define variables(now recommended).

Correct JavaScript variables

var x = 10;  
var _value="hello";  

Incorrect JavaScript variables

var  123=310;  
var *bb=340;  

In later chapter we will discuss about local and global variable.

Solve these below questions.

Sample Question 1:

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