useLayoutEffect Quiz

Test your knowledge of the useLayoutEffect Hook in React, including layout measurement, paint timing, cleanup, server rendering, and performance caveats.

20 questions · free · answers explained

Start the quiz

All questions in this quiz

  1. What is useLayoutEffect mainly used for?
  2. How does useLayoutEffect differ from useEffect?
  3. Which task is a good fit for useLayoutEffect?
  4. Why should useLayoutEffect be used sparingly?
  5. What should you usually prefer when the effect does not need to block paint?
  6. When does the setup function of useLayoutEffect run?
  7. Can useLayoutEffect return a cleanup function?
  8. What happens if you update state inside useLayoutEffect?
  9. Which API is commonly read inside useLayoutEffect for measurement?
  10. Why can useLayoutEffect cause problems with server rendering?
  11. What is a common alternative when layout measurement is not required on initial server HTML?
  12. Which dependency behavior applies to useLayoutEffect?
  13. What is a common symptom that useLayoutEffect may be needed?
  14. What is a common misuse of useLayoutEffect?
  15. Does useLayoutEffect run during the render phase?
  16. Why should work inside useLayoutEffect be kept small?
  17. Which pattern can avoid a tooltip jumping on screen?
  18. What happens before useLayoutEffect setup reruns due to changed dependencies?
  19. What should a component use to access a DOM node measured in useLayoutEffect?
  20. What is the practical rule for choosing useLayoutEffect?

Prefer to read first? React interview questions with written answers.