What is hooks ?
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- by Mcs July 2, 2025
Hooks are special functions introduced in React 16.8 that allow you to "hook into" React state and lifecycle features from functional components. Before hooks, managing state and side effects in React components typically required using class components. Hooks provide a way to achieve the same functionality within simpler functional components.
Most Common Basic Hooks
| Hook | Use |
|---|---|
| useState() | Add state to function components |
| useEffect() | Handle side effects (e.g., API call, DOM updates) |
| useRef() | Create mutable reference (like instance variables) |
| useContext() | Access global/shared data using context |
Advanced Hooks in React
| Hook | Purpose |
|---|---|
| useReducer() | Manages complex state logic (like Redux) |
| useCallback() | Memoizes functions to avoid re-creation on re-renders |
| useMemo() | Memoizes values to prevent expensive recalculations |
| useLayoutEffect() | LikeuseEffect but runs synchronously after DOM updates |
| useImperativeHandle() | Customize the refpassed to a child component |
| useDebugValue() | Show custom labels in React DevTools |
| useDeferredValue() | Improve performance during input rendering |
| useTransition() | Mark UI updates as non-urgent to prevent UI blocking |
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