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Vibe codingMediumvc-g241
Subject Ai code reviewLevel Mid–Senior~16 minCommon in Algorithms & data structures interviewsIndustries Software development

Question

An AI assistant wrote this SwiftUI view-model networking helper. It compiles and works in a quick demo, but in a long-lived screen that re-fetches on pull-to-refresh, instruments shows the view-model count climbing and never dropping. Identify the leak and how you'd catch it.

swift
final class FeedViewModel: ObservableObject {    @Published var items: [Item] = []    private var timer: Timer?     func startPolling() {        timer = Timer.scheduledTimer(withTimeInterval: 30, repeats: true) { _ in            self.api.fetchFeed { result in                if case .success(let items) = result {                    DispatchQueue.main.async { self.items = items }                }            }        }    }}
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.