Code RoomChat messages duplicate on navigation
HardPrep Room Coding #4082

Chat messages duplicate on navigation

Vibe & agenticNetworking & APIsSenior–Staff~20 min

An AI wrote this React Native chat hook. Messages duplicate more and more as the user navigates in and out of the screen, and the app's memory climbs. Diagnose it.

Implement
replay_chat_messages(events: list[str]) → list[str]
Examples
in[["mount:general","emit:general|hello","emit:general|world"]]out["hello","world"]
in[["mount:general","room:random","emit:general|stale","emit:random|fresh"]]out["fresh"]
in[["mount:general","emit:general|hi","unmount","emit:general|hi"]]out[]
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.

0:00 of about 20 min

Vibe & agentic: describe the solution in plain language (or narrate it) and the coach grades your approach.

Which questions mattered is sealed until you submit. Telling you now would just be handing over the edge cases.