Prep RoomSign inStart free
Code RoomuseEffect dependency array changes timing
MediumPrep Room Coding #4232

useEffect dependency array changes timing

Vibe & agenticCode quality & reviewMid–Senior~18 min

You're migrating a large React class component to hooks with an AI agent, one component at a time. The agent confidently converts `componentDidUpdate(prevProps)` logic into a `useEffect`. Below is a sketch of what it produced — explain what behavior changed and how you'd catch it.

Implement
count_effect_runs(dep_values: list[str], unstable_dep: bool, skip_mount: bool) → int
Examples
in[["u1","u1","u2"],false,false]out2
in[["u1","u1","u2"],false,true]out1
in[["u1","u1","u2"],true,false]out3
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 18 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.