React JS Quick Reference Cheat Sheet: Syntax, Hooks & APIs
Bookmark this page for immediate syntax lookup during coding sessions and technical interviews. It summarizes essential CLI commands, modern React hooks, and common error resolutions.
1. Essential Terminal Commands
# Scaffold new Vite project
npm create vite@latest my-app -- --template react
# Install project dependencies
npm install
# Start local development server
npm run dev
# Compile optimized production build
npm run build
# Preview production build locally
npm run preview
2. Core React Hooks Quick Summary
| Hook | Syntax Example | Primary Purpose |
|---|---|---|
useState |
const [val, setVal] = useState(0) |
Local reactive component state. |
useEffect |
useEffect(() => { ... return () => ... }, [deps]) |
Asynchronous side-effects & cleanup. |
useRef |
const ref = useRef(null) |
Mutable container / DOM node reference. |
useContext |
const data = useContext(MyContext) |
Direct global context consumption. |
useReducer |
const [state, dispatch] = useReducer(fn, init) |
Predictable complex state transitions. |
useMemo |
const cached = useMemo(() => calc(), [deps]) |
Memoize expensive calculated values. |
useCallback |
const fn = useCallback(() => { ... }, [deps]) |
Preserve function reference equality. |
useTransition |
const [isPending, startTransition] = useTransition() |
Non-blocking concurrent rendering. |
Congratulations! You Have Mastered React JS!
You have completed the entire 42-class Veewom React JS curriculum. Return to the React Home Page to review key concepts or explore other tutorials on Veewom.
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