Code Reference
Cheat-sheet library for web and app development
Welcome to the Code Reference docs — focused notes for everyday coding.
Each page covers overview, core concepts, examples, pitfalls, and related links.
Topics
Python
Language core, stdlib, tooling, examples
JavaScript
Language, async, modules, DOM
TypeScript
Types, generics, tooling
React
Components, hooks, patterns
React Native
Mobile UI, APIs, Expo
Next.js
App Router, RSC, deployment
Node.js
Express, Fastify, HTTP servers
Zod
Schema validation & TypeScript inference
Tailwind
Utility-first CSS
CSS
Layout, cascade, modern CSS
HTML
Semantic markup, media, a11y
Django
ORM, views, auth, DRF
Docker
Images, Compose, containers
Redis
Cache, data structures, pub/sub
Postgres
Ops, indexes, backups, EXPLAIN
SQL
Queries, schema, advanced SQL
Playwright
E2E browser testing
Pytest
Python testing framework
Jest
JavaScript testing framework
Bash
Shell scripting essentials
PowerShell
Windows shell & automation
GitHub Actions
CI/CD workflows
Git
Everyday Git, recovery, GitHub CLI
Comparisons
A vs B trade-offs
How notes are structured
- Overview — what and when
- Core concepts — APIs / syntax
- Examples — runnable snippets
- Pitfalls — mistakes to avoid
- Related — sibling notes
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