React · Middle · Question 71 of 75

What happens if a parent passes `onChange={() => {}}` inline to a memoized child?

✓Correct answer: A new function is created on each render, so memo sees changed props and re-renders the child
2React reuses the function automatically
3The child never re-renders

Explanation

Wrap it in useCallback with correct dependencies, or let the React Compiler memoize it. Without memo on the child, stable callbacks don't matter.

Further reading

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