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Vibe codingHardvc-g117
Subject Ai code reviewLevel Senior–Staff~18 minCommon in Algorithms & data structures interviewsIndustries Software development

Question

An AI wrote this 'last updated' label for a Next.js server-rendered page. It throws a hydration mismatch warning and the timestamp flickers on load. Explain why and fix it.

tsx
export function LastSeen() {  return (    <span suppressHydrationWarning={false}>      Updated at {new Date().toLocaleTimeString()}    </span>  );}
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.