Variables

Role of a variable

A computer program stores data using variables. A variable is an information storage area. We can imagine it as a box in which you can put and store things!

Variable properties

A variable has three main properties:

• Its name, which identifies it. A variable name may contain upper and lower case letters, numbers (not in the first position), and characters like the dollar sign ($) or underscore (_).
• Its value, which is the data stored in the variable.
• Its type, which determines the role and actions available to the variable.

You don’t have to define a variable type explicitly in JavaScript. Its type is deduced from the value stored in the variable and may change while the ...