What are React hooks?

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React Hooks are special functions introduced in React 16.8 that allow developers to use state and other React features in functional components, which were previously available only in class components. Hooks simplify code, remove the need for classes, and make components more reusable and easier to test.

🔑 Key Points about Hooks

  1. State in Functional Components: With the useState hook, functional components can hold and update state.

  2. Lifecycle in Functional Components: The useEffect hook allows developers to handle side effects like data fetching, subscriptions, or DOM updates, similar to lifecycle methods in class components.

  3. Reusability: Hooks make it easy to extract and reuse stateful logic across multiple components through custom hooks.

  4. Rules of Hooks: Hooks must be called at the top level of a component and only inside React functions, not in loops, conditions, or nested functions.

  5. No this Keyword: Hooks remove the complexity of using this in class components, making the code cleaner and easier to understand.

⚡ Common React Hooks

  • useState → Manages state within a component.

  • useEffect → Handles side effects like fetching data, updating the DOM, or setting timers.

  • useContext → Provides a way to consume values from React Context without prop drilling.

  • useRef → Accesses or stores mutable values that persist across renders, often used for DOM references.

  • useReducer → Manages complex state logic with reducers, similar to Redux patterns.

  • useMemo & useCallback → Optimize performance by memoizing values and functions.

✅ In summary: React Hooks make functional components as powerful as class components while keeping them simpler, more readable, and more efficient.

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