What is useCallback and when should it be used?

useCallback memoizes a function to avoid unnecessary re-creations.

✅ Syntax:

const memoizedCallback = useCallback(() => {

doSomething(a, b);

}, [a, b]);

✅ Use case:

• Prevents unnecessary re-renders of child components receiving functions as props.

const handleClick = useCallback(() => {

console.log("Clicked!");

}, []);