📱 Interview Prep

React Native

Components and styling, the new architecture, hooks, list performance, navigation, native modules, storage, animations, testing and shipping to the app stores.

📘 Learn it from scratch

Visual, hands-on lessons for every pattern in this topic. Do the lesson, then come back and the questions click.

Thinking in React: UI = f(state)State, Events & ReducersHTTP: Requests & ResponsesUnit Testing & Test-Driven Development

100 questions, most asked first

Ordered so the most useful questions for learning each pattern come first.

Any difficulty Easy Medium Hard

All patterns Fundamentals Architecture Lists & performance Build & release Navigation State & hooks Native modules & platform Networking & storage Animations & gestures Testing & debugging Security

#2The bridge vs the New Architecture (JSI, Fabric, TurboModules)ArchitectureHardFree Unlock 16 more React Native questions · all 1,200 questions for $39/year (about 11¢ a day)See full access #20When and how to write a native moduleNative modules & platformHard🔒#24Making a long FlatList fastLists & performanceHard🔒#34Context and re-render performanceState & hooksHard🔒#41Finding out why an app is slowLists & performanceHard🔒#61How a component becomes pixels (Fabric and Yoga)ArchitectureHard🔒#62useTransition and useDeferredValue in React NativeState & hooksHard🔒#68Running work in the backgroundNative modules & platformHard🔒#71Securing network traffic and the app binarySecurityHard🔒#87In-app purchases and subscriptionsNative modules & platformHard🔒#90Migrating an app to the New ArchitectureArchitectureHard🔒#91What JSI makes possibleArchitectureHard🔒#92Reanimated worklets and shared valuesAnimations & gesturesHard🔒#93How FlashList recycles viewsLists & performanceHard🔒#95Social login and OAuth with PKCESecurityHard🔒#96System design: the mobile side of a chat appArchitectureHard🔒#97System design: an offline-first news feedArchitectureHard🔒