useCallback Hook

useCallback is a React hook used to memoize functions, preventing them from being redefined on every render unless their dependencies change. This is critical when passing callbacks to child components that are optimized with React.memo, as a new function reference would otherwise cause unnecessary re-renders.

Example:

const handleClick = useCallback(() => {
  console.log('Button clicked');
}, []);

Each render returns the same function instance unless dependencies change. Without useCallback, a new function reference would be created every time the component re-renders.

Why it’s useful:

• Prevents unnecessary rendering of memoized child components

• Stabilizes function references for use with effects or custom hooks

• Helps maintain consistent behavior in closures

Like useMemo, useCallback is an optimization tool—not always necessary, but powerful when used strategically.

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