A React Native 36,878 app is two programs: a JavaScript bundle, served during development by the Metro bundler, and a native app that runs it in Hermes 11,328 and draws real native views. Setting up means installing tools for both halves and learning which files belong to which, because that decides what a save can change instantly and what needs a new build. Everything here was run on Linux against an Android 16 emulator on 23 September 2026, and it ends with BookNest's scaffold, which the rest of the chapter builds on.
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Project Setup
Setting Up a React Native Project