Prep Room
Sign inCreate account
Code Room
Vibe codingMediumvc-g188
Subject Ai code reviewLevel Mid–Senior~16 minCommon in Concurrency · Code quality & review interviewsIndustries Software development

Question

An AI wrote this TypeScript function to provision a new account: create the user, set up billing, and send a welcome email, in parallel for speed. Review the failure semantics.

typescript
async function provision(input: SignupInput) {  const [user, billing] = await Promise.all([    createUser(input),    createBillingAccount(input),    sendWelcomeEmail(input.email),  ]);  return { userId: user.id, billingId: billing.id };}

What happens when one of these fails partway, and why is the current shape dangerous?

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.