Variables in JavaScript

What is Variables?

• Variables are the container that are used to store the value.
• The stored values can be accessed, updated, and reused whenever needed.

Rules for Naming Variables in JavaScript

1. Variable names can contain letters, digits, _ (underscore), and $ (dollar sign).
2. Variable names must start with a letter, _, or $.
3. Variable names cannot contain spaces.
4. Variable names cannot use special characters except _ and $.
5. Variable names are case-sensitive.
6. Reserved keywords cannot be used as variable names.

There are three ways to declare variables:

• Let
• Const
• Var

Important things about variables:

1. Variable Declaration:

Creating a variable using let, const, or var.

let and var can be declared first and initialized later.

const must be initialized at the time of declaration.

let name;
const pi = 3.14;
var age;

2. Variable Initialization

Assigning a value to a variable.

name="Cat";
age=22;

3. Variable Reassignment

Changing the value of a variable.

var age = 22;
age = 23;

let name="Cat";
name="Parrot";

Excited to continue learning and building with JavaScript!