Vibe codingMediumvc-g477

Subject Ai verificationLevel Mid–Senior~16 minCommon in Algorithms & data structures interviewsIndustries Software development

Question

An AI agent refactored your `applyDiscount(cart, code)` function to support a new percentage-off coupon type. The new coupon works in your test. But `applyDiscount` is also called by the gift-card flow and the loyalty-points flow. Describe how you'd confirm the change didn't break those adjacent features before merging.

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.