JavaScript Variables

Variables are containers for storing data in JavaScript.

JavaScript Variables can be declared in 4 ways:

Automatically

Using var

Using let

Using const

1. Automatically

   They are automatically declared when first used:

   x = 5;

   y = 10;

   z = x + y;

2. Using var

   The var keyword was used in all JavaScript code with the old browser.

   Example:

   var carName

3. Using let

   It is used only if you can’t use const

   Example:

   let carName = “volvo”;

4. Using const

   It is used if the data type is not changing i.e (Arrays and Objects)