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1/8React Hooks — The Complete Guide
🧵 React Hooks still trip up devs after 6 years.
Here's everything you need to know in one thread — from useState to custom hooks:
useState isn't just for simple values.
Most devs do this:
const [count, setCount] = useState(0)But for complex state, use the functional updater form:
setCount(prev => prev + 1)This prevents stale closure bugs in async code. 🔑
useEffect has ONE job: synchronize with external systems.
Not "run code on mount."
Not "watch for changes."
Sync. With. External. Systems.
If you're using it to set state from props — you're probably fighting React, not using it.
The dependency array is a lint rule, not a performance trick.
Every value your effect reads from the component scope goes in the array.
Miss one → stale closure bug.
Add too many → infinite loops.
The ESLint plugin will save you. Turn it on.
useCallback and useMemo are for referential stability — not raw performance.
Use them when:
✅ A child component wraps the prop in React.memo
✅ The value is a useEffect dependency
NOT just because the function "looks expensive."
Profile first. Optimize second.
useRef isn't just for DOM access.
It's a mutable box that survives renders without causing them.
const timerId = useRef(null)
// store interval ID, prev value, anything
// that needs to persist but NOT trigger re-rendersCustom hooks are the real unlock.
Any time you find yourself copy-pasting useEffect + useState logic across components — that's a hook waiting to be extracted.
useFetch, useDebounce, useLocalStorage — these aren't magic, they're just extracted logic.
TL;DR React Hooks cheatsheet:
• useState → local UI state
• useEffect → sync with external systems
• useCallback/useMemo → referential stability, not speed
• useRef → persist without re-rendering
• Custom hooks → reusable stateful logic
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