📛 Nomenclature

There are 2 hard problems in computer science:

• cache invalidation
• naming things
• off-by-1 errors

Let's take a look at the second one.

Conventions

Name	Example	a.k.a.
Camel Case	camelCase	Dromedary Case, Hump Case
Pascal Case	PascalCase	Upper Camel Case
Snake Case	snake_case	Pothole Case
Pascal Snake Case	Pascal_Snake_Case
Screaming Snake Case	SCREAMING_SNAKE_CASE	Upper Case Snake Case, Macro Case, Constant Case
Kebab Case	kebab-case
Cobol Case	COBOL-CASE	Screaming Kebab Case
Train Case	Train-Case
Flat Case	flatcase
Title Case	Title Case
Sentence Case	Sentence case

Python

• Variable: snake_case
• Constant: SCREAMING_SNAKE_CASE
• Function: snake_case
• Class: PascalCase
• Method: snake_case
• Module: snake_case
• PyPI Project: Train-Case of the module name [^1]

PyPI allows [a-z0-9_.-] in project name, with additional normalization rules.

References

• PEP 8 - Style Guide for Python Code
• PEP 257 - Docstring Conventions
• PEP 423 - Naming conventions and recipes related to packaging
• PyPI Names and normalization

Java

• Variable: camelCase
• Constant: SCREAMING_SNAKE_CASE
• Class: PascalCase
• Method: camelCase
• Interface: PascalCase
• Enum: PascalCase

JavaScript

• Variable: camelCase
• Constant: SCREAMING_SNAKE_CASE
• Function: camelCase
• Class: PascalCase
• Method: camelCase
• npm Package: kebab-case of the package name [^2]

npm allows [a-z0-9-_] in package name.

References

• npm pcakage name

HTTP

• Headers: Train-Case

HTML + CSS

note

HTML tag and attribute names are case-insensitive. The following conventions are just for readability.

• HTML Tag: flatcase
• HTML Attribute: flatcase
• HTML/CSS ID: kebab-case
• HTML/CSS Class: kebab-case

SQL

info

In PostgreSQL, all identifiers are case-sensitive, but unless you quote them, they are folded to lower case.

• Table name: Singular snake_case
• Column name: Singular snake_case

References

• SQL Style Guide

References

• Quick Guide to Programming Case Types – Amy's Programming Corner