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📱 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

#6How does navigation work in React Native?NavigationMediumFree #7Avoiding unnecessary re-rendersState & hooksMediumFree #9Storing data on the deviceNetworking & storageMediumFree #10What is Hermes?ArchitectureMediumFree Unlock 51 more React Native questions · all 1,200 questions for $39/year (about 11¢ a day)See full access #11The threads of a React Native appArchitectureMedium🔒#12Animated vs ReanimatedAnimations & gesturesMedium🔒#13useEffect cleanup and subscriptionsState & hooksMedium🔒#14Images in React Native appsLists & performanceMedium🔒#16Handling flaky networks and offline modeNetworking & storageMedium🔒#17How push notifications workNative modules & platformMedium🔒#18Over-the-air (OTA) updatesBuild & releaseMedium🔒#25Choosing a state management approachState & hooksMedium🔒#26useMemo and useCallbackState & hooksMedium🔒#29Deep links and universal linksNavigationMedium🔒#32Writing custom hooksState & hooksMedium🔒#33useReducer vs useStateState & hooksMedium🔒#35Passing params between screens (and typing them)NavigationMedium🔒#36Building a login flowNavigationMedium🔒#37Storing tokens and secrets securelySecurityMedium🔒#39Supporting phones, tablets and rotationFundamentalsMedium🔒#40Accessibility in React NativeFundamentalsMedium🔒#42Improving app start-up timeLists & performanceMedium🔒#43Memory leaks in React NativeLists & performanceMedium🔒#44Reducing app and bundle sizeBuild & releaseMedium🔒#46Infinite scroll and pull-to-refreshLists & performanceMedium🔒#48Gestures with React Native Gesture HandlerAnimations & gesturesMedium🔒#49Animating items appearing and disappearingAnimations & gesturesMedium🔒#50Unit and component testingTesting & debuggingMedium🔒#51End-to-end testing with Detox or MaestroTesting & debuggingMedium🔒#52Mocking native modules in JestTesting & debuggingMedium🔒#53Error boundaries and crash reportingTesting & debuggingMedium🔒#55Environments and configurationBuild & releaseMedium🔒#56Releasing to the App Store and Google PlayBuild & releaseMedium🔒#58CI/CD for a React Native appBuild & releaseMedium🔒#59Upgrading React Native versionsBuild & releaseMedium🔒#63Real-time updates with WebSocketsNetworking & storageMedium🔒#64Server-state caching with TanStack QueryNetworking & storageMedium🔒#65AsyncStorage vs MMKV vs SQLiteNetworking & storageMedium🔒#66Uploading photos and filesNetworking & storageMedium🔒#69Getting the user's locationNative modules & platformMedium🔒#70Face ID, Touch ID and fingerprint loginSecurityMedium🔒#72Translations, RTL and localizationFundamentalsMedium🔒#76Tabs, stacks and nested navigatorsNavigationMedium🔒#78File-based routing with Expo RouterNavigationMedium🔒#79Sharing code between mobile and webArchitectureMedium🔒#82Stale closures in callbacks and intervalsState & hooksMedium🔒#83State updates are batchedState & hooksMedium🔒#84Search-as-you-type without race conditionsNetworking & storageMedium🔒#85Optimistic updatesNetworking & storageMedium🔒#86Feature flags, analytics and A/B testsBuild & releaseMedium🔒#89Building a reusable component libraryFundamentalsMedium🔒#94ANRs and native crashesTesting & debuggingMedium🔒#98Structuring a large React Native codebaseFundamentalsMedium🔒#99Avoiding App Store and Play Store rejectionsBuild & releaseMedium🔒#100What do you look for when reviewing a React Native PR?FundamentalsMedium🔒