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Question
An AI assistant built this TypeScript endpoint for a 'custom formula' feature: users type a math expression in the UI and the server computes the result. It works for inputs like `2 * (3 + 4)`. Review it before it ships to all customers.
import express from "express";const app = express();app.use(express.json()); app.post("/api/evaluate", (req, res) => { const { expression } = req.body as { expression: string }; // Compute the user's formula const result = eval(expression); res.json({ result });});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
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.