JavaScript Naming Conventions

Programming has many naming conventions used to write clean and readable code

Style	Example
camelCase	firstName
PascalCase	FirstName
snake_case	first_name
UPPER_SNAKE_CASE	MAX_SIZE
kebab-case	first-name
Train-Case	First-Name
flatcase	firstname
UPPERCASE	FIRSTNAME
camel_Snake_Case	first_Name

Most Common Styles:

1. camelCase:

firstName
mobileNumber

Used for:

• Variables

• Functions

2. PascalCase:

FirstName
StudentDetails

Used for:

• Classes

• Components

3. snake_case:

first_name
mobile_number

Common in:

• Python

• Databases

4. UPPER_SNAKE_CASE:

MAX_SIZE
PI_VALUE

Used for:

• Constants

5. kebab-case:

first-name
user-profile

Used for:

• URLs

• CSS class names

In JavaScript, you cannot use first-name as a variable name because the-(hyphen) is interpreted as the minus operator.

 Error:

let first-name = "Raja"; 

Rule: Variable names can contain letters, numbers, _ (underscore), and $, but not - (hyphen)