Vibe codingMediumvc-g112

Subject Ai code reviewLevel Mid–Senior~17 minCommon in Algorithms & data structures interviewsIndustries Software development

Question

This AI-written hook tracks window width for a responsive layout. After navigating between pages a few times the app slows down and console warns about updating an unmounted component. Identify the defect.

tsx

1function useWindowWidth() {2  const [width, setWidth] = useState(window.innerWidth);3  useEffect(() => {4    window.addEventListener('resize', () => setWidth(window.innerWidth));5  }, []);6  return width;7}

What a strong answer looks like

Treat the AI’s output as a draft to verify, not an answer to trust. Name the specific flaw and the input that triggers it, say how you’d catch it — tests, edge cases, reading critically — and how you’d re-prompt or decompose to get it right.

Learn the concepts

Describe your solution

Vibe coding: describe the solution in plain language (or narrate it) and the coach grades your approach. Generating runnable code from your description is coming next.

Run or narrate your approach, then ask the coach.