âïž React Hooks â A Quick Guide
React Hooks are functions that let you “hook into” React state and lifecycle features from function components. Introduced in React 16.8, Hooks eliminate the need for class components for most use cases.
đ§ Why Use Hooks?
Reuse logic across components (via custom hooks)
Simplify component structure (no classes)
Cleaner and more readable state management
Easily manage side effects
đŠ Built-in React Hooks
| Hook | Purpose |
|---|---|
useState | Manage local state |
useEffect | Handle side effects (e.g., fetch, subscriptions) |
useContext | Consume React Context |
useRef | Persist mutable values without re-rendering |
useMemo | Optimize performance with memoized values |
useCallback | Memoize functions to prevent unnecessary renders |
useReducer | State logic with reducers (like Redux) |
useLayoutEffect | Similar to useEffect but fires synchronously |
useImperativeHandle | Customize the instance value exposed by ref |
useId, useTransition, useDeferredValue | Advanced, concurrent mode-specific hooks (React 18+) |
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đ ïž Examples of Popular Hooks
đą 1. useState
đĄ 2. useEffect
đ” 3. useContext
đŽ 4. useRef
đŁ 5. useReducer (good for complex state)
đ§ Custom Hook Example
Create reusable logic:
Use it like:
đ§Ș Tips & Gotchas
Never use Hooks conditionally (must always run in the same order)
Custom hooks are just functions that use other hooks
useEffect()replacescomponentDidMount,componentDidUpdate,componentWillUnmountDonât mutate state directly â always use
setState/dispatch
đ Resources to Learn Hooks
đ useHooks.dev â Ready-made custom hooks
