React Hooks Deep Dive
Demo Creator
@seed-creator · muallif
The Hook Mental Model
Hooks let you attach state and side-effects to function components. Each call to useState creates an independent piece of state tied to that render cycle.
Think of hooks as subscriptions: you declare what you depend on, React decides when to re-render.
useState and useReducer
useState is fine for simple boolean or string values. Reach for useReducer when the next state depends on the previous one or when you have related state fields that change together.
Pass a function to useState to compute expensive initial state lazily — it is only called on the first render.
Avoiding Stale Closures
useEffect and useCallback capture variables by closure. Always list every variable they read in the dependency array. ESLint plugin react-hooks/exhaustive-deps enforces this automatically.
function Counter() { const [count, setCount] = useState(0); const increment = useCallback(() => { setCount(prev => prev + 1); }, []); return <button onClick={increment}>{count}</button>;}
Use the functional updater form so increment never goes stale — prev is always the latest value.
useMemo and useCallback
Only memoize when a measurable performance problem exists. Premature memoization adds complexity and can hide real issues. Profile first.
6 ta izoh
Tizimga kiring izoh qoldirish uchun.
This landed at exactly the right time for me — the pull-quote is going straight into my notes.
Glad it helped! That line took a few rewrites to get right.
Same here. Any chance of a follow-up that goes a level deeper?
The callout halfway through saved me a debugging session this week.
Would love a section on the trickier edge cases.
+1 to that — the edge cases are where this stuff earns its keep.