Sandbox demo
Scaffold an Expo App
From `npx create-expo-app` to a running iOS simulator in five turns.
Watch a real bootstrap: empty folder, a single prompt, an app you can navigate. Codex pulls together the right CLI invocations, the right config, and the right starter screen — then proves it by booting the simulator.
Sandbox transcript
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The transcript is canned — no real API calls. The point is to internalize the loop: user → plan → tool → result → answer.
Check your understanding
Q1. Why use Expo over bare React Native to start?
· Score 100% on the quiz.