React Native Cheat Sheet 2026

The 30 highest-yield React Native facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. A photo-sharing app uploads images to S3. Large uploads fail on slow connections. What technique improves reliability? → Use multipart/chunked upload with retry logic per chunk
2. Which tool provides a dashboard for tracking React Native crash rates, ANRs, and performance in production? → Firebase Crashlytics
3. Google Play's Data Safety section requires app developers to declare which of the following? → Data collected and shared by both the app and its SDKs
4. Which hook from Redux Toolkit allows a component to read from the Redux store? → useSelector
5. How has digital technology transformed React Native practice? → It has enhanced data collection, analysis, communication, and operational efficiency
6. What is the purpose of the `Linking` API in React Native? → To open URLs, deep links, and external apps like phone dialers or email clients
7. A travel app renders a list of 500 destination cards, each with a complex nested layout. Users report janky scrolling. What is the first optimization to apply? → Wrap each card in React.memo to prevent unnecessary re-renders
8. Which of the following is the correct flux concept data flow sequence? → Action->Dispatcher->Store->View
9. What role does active listening play in React Native practice? → It ensures accurate understanding, demonstrates respect, and improves outcomes
10. Which React Native API lets you copy text to the system clipboard? → Clipboard.setString() from @react-native-clipboard/clipboard
11. A messaging app stores thousands of chat messages locally. Which storage solution handles relational queries and large datasets best? → SQLite via a library like react-native-quick-sqlite
12. What does the Pressable component offer over TouchableOpacity? → More granular press state handling with ripple effects
13. What does `react-native link` do in older React Native projects? → Manually connects native module dependencies to the iOS and Android build systems
14. Which React Native API is used to handle device back button presses on Android? → BackHandler
15. How do React Native professionals evaluate research quality? → By assessing methodology, sample size, peer review status, and relevance to practice
16. Which React hook is used to manage local component state in React Native? → useState
17. In React Native's New Architecture, what replaces the bridge for communication between JS and native code? → JSI (JavaScript Interface)
18. In react, keys are assigned to a list of elements. These are the keys: → Unique among the siblings only
19. Choose the result of typing "npm init" at the command prompt. → Initializes a package.json file
20. Which storage solution ships built-in with React Native for persisting small key-value data? → AsyncStorage
21. What is the primary value of case study analysis in React Native training? → Developing critical thinking by applying theory to realistic professional scenarios
22. How do React Native professionals transfer knowledge from training to practice? → Through supervised practice, mentoring, gradual independence, and ongoing feedback
23. How can you pass parameters to a screen when navigating in React Navigation? → navigation.navigate('Screen', { key: value })
24. Which method on FlatList helps improve performance by specifying item dimensions? → getItemLayout
25. Which method resets the navigation stack and navigates to a new screen? → navigation.reset
26. Which React Native feature must be configured to comply with iOS's requirement that users be shown a purpose string before granting camera access? → NSCameraUsageDescription in Info.plist
27. An analytics dashboard renders dozens of recharts-style SVG charts. The app feels sluggish on mid-range devices. What helps most? → Replace SVG charts with Canvas-based rendering via react-native-skia
28. Evidence-based testing strategy for React Native recommends the primary tool for component-level unit tests that avoid testing implementation details? → React Native Testing Library (RNTL)
29. What is the implementation of the Navigator component in React Native? → JavaScript
30. What causes unnecessary re-renders in React Native components? → Passing new object or function references as props on every render