JavaScript Variables

JavaScript Variables


JavaScript Variables
Variable can be defined as a container to hold data. A variable’s value during the script. Variables names must start with a letter of the alphabet or an underscore. Keywords to create variables is as shows below: 
let, const, var that’s all
Variables are declared with a var statement:
  • var pi = 3.1416, x, y, name = "Dr. Dave" ;
  • Variables names must begin with a letter or underscore and Variable names are case-sensitive 
  • Variables are untyped (they can hold values of any type)
  • The word var is optional (but it’s good style to use it)
Example
Output
Using let keyword in another example, ab, and c, are variables is as follows:
Example
Output
Using const keyword in another example, ab, and c, are variables is as follows:
If you want a general rule: always declare variables with const.
If you think the value of the variable can change, use let.
Example
Output