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Q) React Hooks
REACT HOOKS: A Quick Reference
1. useState
Purpose: Add state management to functional components. Description: Returns a stateful value and a function to update it. Ideal for simple, independent pieces of state. Basic Syntax: const [stateVariable, setStateFunction] = useState(initialValue); Example: const [count, setCount] = useState(0);
2. useEffect
Purpose: Perform "side effects" (e.g., data fetching, subscriptions, DOM manipulation) in functional components. Description: Runs after every render by default. Can be controlled to run only on mount, unmount, or when specific dependencies change using a dependency array ([ ]). Basic Syntax: useEffect(() => { /* side effect code */ return () => { /* cleanup */ }; }, [dependencies]); Example: useEffect(() => { document.title = `Count: ${count}`; }, [count]);
3. useContext
Purpose: Access the value of a React Context from a functional component. Description: Allows components to consume context values without prop drilling, making global data accessible directly. Basic…
