React Native Interview Questions Your Guide to Success

React Native is a powerful framework for building cross-platform mobile applications using JavaScript and React. Stark.ai offers a curated collection of React Native interview questions, real-world scenarios, and expert guidance to help you excel in your next technical interview.

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  • Fundamentals & Core Concepts

    • What is the React Native bridge and how does it work?

      The bridge is the communication layer between JavaScript and native code. It serializes data and handles...

    • How does React Native handle platform-specific code?

      React Native provides Platform.select(), platform-specific file extensions (.ios.js/.android.js), Platform.OS...

    • What are native modules and when should you use them?

      Native modules expose platform-specific APIs to JavaScript through the bridge. They're used when requiring direct...

    • What is the role of the Shadow Thread in React Native?

      The Shadow Thread handles layout calculations using Yoga (Facebook's cross-platform layout engine). It processes...

    • How does React Native handle JavaScript engines across platforms?

      iOS uses JavaScriptCore (JSC) by default, while Android can use either JSC or Hermes. Hermes is Facebook's custom JS...

    • What is the purpose of linking in React Native?

      Linking handles deep linking and URL scheme integration in React Native apps. It provides methods to open external...

    • How does React Native handle app permissions?

      React Native provides APIs to request and check platform permissions (camera, location, etc.). These are handled...

    • What is the role of the Metro configuration file?

      metro.config.js customizes the Metro bundler's behavior, including module resolution, asset handling, and...

    • How does React Native handle assets and resources?

      Assets are handled through the Metro bundler, which can process images, fonts, and other resources....

  • Components & Props

    • How do you implement component composition in React Native?

      Component composition involves building larger components from smaller ones using props.children, render props, and...

    • What are refs in React Native and when should you use them?

      Refs provide a way to access DOM nodes or React elements directly. They should be used sparingly for cases like...

    • How do you optimize FlatList performance?

      FlatList performance can be optimized by: 1) Using getItemLayout to avoid measurement of items, 2) Implementing...

    • What are controlled and uncontrolled components?

      Controlled components have their state managed by React through props and callbacks (e.g., value and onChangeText)....

    • How do you handle component lifecycle in modern React Native?

      Modern React Native uses hooks like useEffect for lifecycle management. useEffect replaces componentDidMount,...

    • What is the purpose of PureComponent and when should it be used?

      PureComponent implements shouldComponentUpdate with a shallow prop and state comparison. It's used to optimize...

    • How do you handle prop validation in React Native?

      Prop validation is handled using PropTypes or TypeScript. PropTypes provide runtime checking of prop types, while...

    • What are Higher-Order Components (HOCs) and their use cases?

      HOCs are functions that take a component and return a new component with additional props or behavior. They're used...

    • How do you handle modal dialogs in React Native?

      Modal dialogs can be implemented using the Modal component or third-party libraries. Considerations include proper...

    • What are render props and how do they differ from HOCs?

      Render props are a pattern where a component receives a function prop that returns React elements. Unlike HOCs,...

  • State Management

    • How does Redux work in React Native?

      Redux implements a unidirectional data flow with a single store holding the application state. Actions describe...

    • What is Redux Toolkit and how does it simplify state management?

      Redux Toolkit is the official toolset for Redux development. It simplifies store setup, reduces boilerplate through...

    • How do you implement state persistence in React Native?

      State persistence involves: 1) Using AsyncStorage or similar storage solutions, 2) Implementing redux-persist for...

    • What are the benefits and drawbacks of MobX?

      MobX offers simpler setup than Redux, automatic tracking of state dependencies, and more flexibility in state...

    • How do you handle real-time state updates?

      Real-time updates can be handled through: 1) WebSocket connections with state synchronization, 2) Push notifications...

    • What are custom hooks and how do they help in state management?

      Custom hooks are JavaScript functions that use React hooks to encapsulate reusable state logic. They help abstract...

    • How do you handle form validation state?

      Form validation state involves: 1) Tracking input values and errors, 2) Implementing validation rules and error...

    • What is the role of middleware in Redux?

      Middleware intercepts actions before they reach reducers, enabling side effects, async operations, logging, and...

    • How do you optimize Context API performance?

      Context optimization includes: 1) Split contexts by functionality, 2) Memoize context values, 3) Use context...

    • What are the patterns for managing complex state interactions?

      Complex state patterns include: 1) State machines with XState, 2) Command pattern for actions, 3) Observable pattern...

  • Navigation & Routing

    • How do you implement nested navigation?

      Nested navigation involves placing one navigator inside another (e.g., tab navigator inside stack navigator). Each...

    • What are navigation state persistence options?

      Navigation state can be persisted using persistNavigationState and loadNavigationState props on NavigationContainer....

    • How do you handle authentication flows in navigation?

      Authentication flows typically use conditional navigation based on auth state, often implementing stack switching or...

    • What are navigation events and how are they used?

      Navigation events (focus, blur, beforeRemove, state) can be listened to using addListener. They're useful for...

    • How do you implement custom navigation animations?

      Custom animations can be implemented using cardStyleInterpolator for stack navigator or custom transition...

    • What are navigation middlewares and when are they used?

      Navigation middlewares intercept and modify navigation actions before they're processed. They're useful for logging,...

    • How do you handle deep linking with parameters?

      Deep linking with parameters requires proper linking configuration with parameter extraction from URLs, parameter...

    • What are the strategies for handling navigation performance?

      Navigation performance optimization includes: 1) Screen preloading, 2) Lazy loading screens, 3) Minimizing...

    • How do you implement navigation testing?

      Navigation testing involves mocking navigation props, simulating navigation actions, testing deep linking handling,...

    • What is the role of linking configuration in React Navigation?

      Linking configuration defines URL pattern matching for deep links, including parameter extraction and screen...

  • Performance Optimization

    • How do you optimize FlatList performance?

      FlatList optimization includes: 1) Using getItemLayout to avoid measurement, 2) Implementing proper key extraction,...

    • What are the strategies for reducing bridge traffic?

      Bridge traffic can be reduced by: 1) Batching updates, 2) Minimizing state updates, 3) Using native modules for...

    • How do you implement efficient animations?

      Efficient animations involve: 1) Using native driver when possible, 2) Implementing proper interpolation, 3) Using...

    • What are the best practices for memory management?

      Memory management includes: 1) Proper cleanup in useEffect, 2) Removing event listeners, 3) Clearing timeouts and...

    • How do you optimize network requests?

      Network optimization includes: 1) Implementing proper caching, 2) Using request batching, 3) Implementing retry...

    • What is the impact of JavaScript dependencies on performance?

      Dependencies impact includes: 1) Bundle size increase, 2) Startup time effects, 3) Runtime performance overhead, 4)...

    • How do you implement efficient state management?

      Efficient state management involves: 1) Proper state structure, 2) Minimizing state updates, 3) Using appropriate...

    • What are the strategies for reducing app startup time?

      Startup optimization includes: 1) Using Hermes engine, 2) Implementing proper code splitting, 3) Optimizing native...

    • How do you implement efficient layout calculations?

      Layout optimization includes: 1) Using LayoutAnimation properly, 2) Minimizing layout depth, 3) Implementing proper...

    • What are the techniques for profile and debug performance issues?

      Profiling techniques include: 1) Using React DevTools, 2) Implementing performance monitoring, 3) Using native...

  • Platform Specific Development

    • How do you implement platform-specific native modules?

      Native modules require separate implementations in Swift/Objective-C for iOS and Java/Kotlin for Android. This...

    • What are the differences in navigation patterns between iOS and Android?

      iOS typically uses edge swipe gestures and navbar buttons, while Android uses the back button and different...

    • How do you handle platform-specific animations?

      Animation implementations may need platform-specific tuning for timing, easing, and performance. Native drivers...

    • What are the key differences in debugging between iOS and Android?

      Debugging tools and processes differ between platforms. iOS uses Xcode debugging tools while Android uses Android...

    • How do you handle platform-specific push notifications?

      Push notifications require different setup and handling for APNs (iOS) and FCM (Android). This includes different...

    • What are the differences in app lifecycle handling between platforms?

      App lifecycle events and background handling differ between iOS and Android. This includes different background...

    • How do you handle platform-specific storage mechanisms?

      Storage mechanisms like AsyncStorage have platform-specific implementations and limitations. Secure storage, file...

    • What are the key differences in performance optimization between platforms?

      Performance optimization requires platform-specific approaches for memory management, UI rendering, and native...

    • How do you handle platform-specific network security?

      Network security configuration differs between platforms, including SSL pinning, network permissions, and security...

    • What are the approaches for handling platform-specific biometric authentication?

      Biometric authentication requires different implementations for Touch ID/Face ID (iOS) and Fingerprint/Face Unlock...

  • Styling & Layout

    • How do you implement custom fonts in React Native?

      Custom fonts require platform-specific setup: iOS needs font files added to the Xcode project and Info.plist,...

    • How do you handle dynamic styling based on props or state?

      Dynamic styling can be implemented using style arrays, conditional styles in objects, or dynamic style generation...

    • What are the best practices for handling device orientation changes?

      Orientation changes require responsive layouts using flex, Dimensions API updates handling, and potentially...

    • How do you implement custom shadows across platforms?

      Shadows require different implementations: iOS uses shadow* properties, Android uses elevation. Platform-specific...

    • How do you handle keyboard avoidance in layouts?

      KeyboardAvoidingView component with appropriate behavior prop ('height', 'position', 'padding') handles keyboard...

    • What are the approaches for implementing grid layouts?

      Grid layouts can be implemented using FlatList with numColumns, flexbox with flex-wrap, or custom grid components....

    • How do you handle RTL (Right-to-Left) layouts?

      RTL support requires proper use of start/end instead of left/right, handling text alignment, and considering layout...

    • What are the strategies for handling different screen densities?

      Screen density handling involves using density-independent pixels, proper image asset management (including @2x,...

    • How do you implement animated layouts?

      Animated layouts use LayoutAnimation or Animated API. LayoutAnimation provides simple animations for layout changes....

    • What are the performance considerations for styling?

      Style performance considerations include using StyleSheet.create, avoiding inline styles, minimizing style...

  • APIs & Network Integration

    • How do you implement API caching?

      API caching can be implemented using in-memory caching, AsyncStorage, or specialized caching libraries. Consider...

    • What are the best practices for handling offline data synchronization?

      Offline sync requires local storage of data, queue management for offline actions, conflict resolution strategies,...

    • How do you handle file uploads in React Native?

      File uploads require proper multipart/form-data handling, progress tracking, chunked uploads for large files, and...

    • What are the strategies for API request cancellation?

      Request cancellation can be implemented using AbortController with fetch, or cancelToken with Axios. Important for...

    • How do you handle API rate limiting?

      Rate limiting requires implementing request queuing, proper error handling for rate limit responses, exponential...

    • What are Websockets and how are they implemented?

      WebSockets provide real-time bidirectional communication. Implementation involves socket connection management,...

    • How do you handle API versioning in your app?

      API versioning strategies include URL versioning, header versioning, or content negotiation. Apps should handle...

    • What are the security considerations for API integration?

      Security considerations include SSL/TLS, token management, certificate pinning, request/response encryption, and...

    • How do you handle API response compression?

      Response compression involves proper handling of Content-Encoding headers, decompression of gzipped responses, and...

    • What are the strategies for API request batching?

      Request batching involves combining multiple requests into single requests, implementing proper request queuing, and...

What is the React Native bridge and how does it work?

The bridge is the communication layer between JavaScript and native code. It serializes data and handles asynchronous communication between JS and native threads. All native module calls and UI updates pass through the bridge, which can impact performance with heavy data transfers.

How does React Native handle platform-specific code?

React Native provides Platform.select(), platform-specific file extensions (.ios.js/.android.js), Platform.OS checks, and platform-specific components. These methods allow writing platform-specific logic while maintaining a shared codebase.

What are native modules and when should you use them?

Native modules expose platform-specific APIs to JavaScript through the bridge. They're used when requiring direct access to platform APIs, implementing performance-critical features, or integrating third-party SDKs that don't have React Native implementations.

What is the role of the Shadow Thread in React Native?

The Shadow Thread handles layout calculations using Yoga (Facebook's cross-platform layout engine). It processes flex layouts and converts them to native layouts, running separately from the main thread to ensure smooth UI performance.

How does React Native handle JavaScript engines across platforms?

iOS uses JavaScriptCore (JSC) by default, while Android can use either JSC or Hermes. Hermes is Facebook's custom JS engine optimized for React Native, offering better performance, reduced memory usage, and faster startup times.

What is the purpose of linking in React Native?

Linking handles deep linking and URL scheme integration in React Native apps. It provides methods to open external links and handle incoming deep links, enabling integration with other apps and web content.

How does React Native handle app permissions?

React Native provides APIs to request and check platform permissions (camera, location, etc.). These are handled through native modules and require configuration in platform-specific files (AndroidManifest.xml, Info.plist).

What is the role of the Metro configuration file?

metro.config.js customizes the Metro bundler's behavior, including module resolution, asset handling, and transformation settings. It can be modified to support different file types, customize bundling, and optimize build performance.

How does React Native handle assets and resources?

Assets are handled through the Metro bundler, which can process images, fonts, and other resources. Platform-specific asset selection is supported through asset suffixes, and the require syntax is used for static asset references.

How do you implement component composition in React Native?

Component composition involves building larger components from smaller ones using props.children, render props, and higher-order components. This promotes code reuse, maintainability, and separation of concerns in the application architecture.

What are refs in React Native and when should you use them?

Refs provide a way to access DOM nodes or React elements directly. They should be used sparingly for cases like managing focus, text selection, animations, or integrating with third-party libraries. Refs should not be used for tasks that can be handled through props and state.

How do you optimize FlatList performance?

FlatList performance can be optimized by: 1) Using getItemLayout to avoid measurement of items, 2) Implementing windowSize and maxToRenderPerBatch, 3) Using removeClippedSubviews, 4) Implementing proper key extraction, and 5) Optimizing renderItem function with memo or PureComponent.

What are controlled and uncontrolled components?

Controlled components have their state managed by React through props and callbacks (e.g., value and onChangeText). Uncontrolled components maintain their own internal state. Controlled components provide more predictable behavior but require more setup.

How do you handle component lifecycle in modern React Native?

Modern React Native uses hooks like useEffect for lifecycle management. useEffect replaces componentDidMount, componentDidUpdate, and componentWillUnmount. The dependency array controls when effects run, and cleanup functions handle teardown.

What is the purpose of PureComponent and when should it be used?

PureComponent implements shouldComponentUpdate with a shallow prop and state comparison. It's used to optimize performance by preventing unnecessary renders when props or state haven't changed. Should be used for components with simple props/state structures.

How do you handle prop validation in React Native?

Prop validation is handled using PropTypes or TypeScript. PropTypes provide runtime checking of prop types, while TypeScript offers compile-time type checking. Both help catch bugs early and improve code documentation.

What are Higher-Order Components (HOCs) and their use cases?

HOCs are functions that take a component and return a new component with additional props or behavior. They're used for code reuse, adding functionality like authentication, logging, or data fetching. HOCs follow the principle of composition over inheritance.

How do you handle modal dialogs in React Native?

Modal dialogs can be implemented using the Modal component or third-party libraries. Considerations include proper animation handling, backdrop press handling, accessibility, and platform-specific behaviors like hardware back button on Android.

What are render props and how do they differ from HOCs?

Render props are a pattern where a component receives a function prop that returns React elements. Unlike HOCs, render props provide more flexibility in composing behavior and avoid naming collisions. They're useful for sharing stateful logic between components.

How does Redux work in React Native?

Redux implements a unidirectional data flow with a single store holding the application state. Actions describe state changes, reducers specify how actions transform state, and components connect to the store using hooks or HOCs. Middleware handles side effects.

What is Redux Toolkit and how does it simplify state management?

Redux Toolkit is the official toolset for Redux development. It simplifies store setup, reduces boilerplate through createSlice, handles immutable updates with Immer, and includes RTK Query for data fetching. It provides utilities for common Redux patterns.

How do you implement state persistence in React Native?

State persistence involves: 1) Using AsyncStorage or similar storage solutions, 2) Implementing redux-persist for Redux state, 3) Handling storage serialization/deserialization, 4) Managing storage versioning, 5) Implementing proper error handling and fallbacks.

What are the benefits and drawbacks of MobX?

MobX offers simpler setup than Redux, automatic tracking of state dependencies, and more flexibility in state structure. Drawbacks include potential overuse of observables, harder debugging due to automatic updates, and less predictable state changes.

How do you handle real-time state updates?

Real-time updates can be handled through: 1) WebSocket connections with state synchronization, 2) Push notifications with state updates, 3) Polling with proper state merging, 4) Optimistic updates with rollback handling.

What are custom hooks and how do they help in state management?

Custom hooks are JavaScript functions that use React hooks to encapsulate reusable state logic. They help abstract complex state management, share stateful logic between components, and improve code organization and reusability.

How do you handle form validation state?

Form validation state involves: 1) Tracking input values and errors, 2) Implementing validation rules and error messages, 3) Managing submission state, 4) Handling async validation, 5) Coordinating multiple form fields' validation state.

What is the role of middleware in Redux?

Middleware intercepts actions before they reach reducers, enabling side effects, async operations, logging, and routing. Common middleware includes redux-thunk for async actions, redux-saga for complex workflows, and custom middleware for specific needs.

How do you optimize Context API performance?

Context optimization includes: 1) Split contexts by functionality, 2) Memoize context values, 3) Use context selectors to prevent unnecessary rerenders, 4) Implement context providers at appropriate levels, 5) Consider alternative solutions for frequently changing values.

What are the patterns for managing complex state interactions?

Complex state patterns include: 1) State machines with XState, 2) Command pattern for actions, 3) Observable pattern for state streams, 4) Reducer composition for modular state logic, 5) Event sourcing for state history.

How do you optimize FlatList performance?

FlatList optimization includes: 1) Using getItemLayout to avoid measurement, 2) Implementing proper key extraction, 3) Using removeClippedSubviews, 4) Optimizing renderItem with memo, 5) Adjusting windowSize and maxToRenderPerBatch, 6) Implementing proper item height calculations.

What are the strategies for reducing bridge traffic?

Bridge traffic can be reduced by: 1) Batching updates, 2) Minimizing state updates, 3) Using native modules for heavy computations, 4) Implementing proper data serialization, 5) Using Hermes engine, 6) Optimizing image loading and processing.

How do you implement efficient animations?

Efficient animations involve: 1) Using native driver when possible, 2) Implementing proper interpolation, 3) Using layoutAnimation for simple layouts, 4) Optimizing gesture handling, 5) Managing animation memory usage, 6) Using proper timing functions.

What are the best practices for memory management?

Memory management includes: 1) Proper cleanup in useEffect, 2) Removing event listeners, 3) Clearing timeouts and intervals, 4) Implementing proper image caching, 5) Managing large data structures, 6) Monitoring memory leaks.

How do you optimize network requests?

Network optimization includes: 1) Implementing proper caching, 2) Using request batching, 3) Implementing retry logic, 4) Optimizing payload size, 5) Using proper compression, 6) Implementing offline support, 7) Managing concurrent requests.

What is the impact of JavaScript dependencies on performance?

Dependencies impact includes: 1) Bundle size increase, 2) Startup time effects, 3) Runtime performance overhead, 4) Memory usage implications, 5) Bridge traffic increase. Proper dependency management and auditing is crucial.

How do you implement efficient state management?

Efficient state management involves: 1) Proper state structure, 2) Minimizing state updates, 3) Using appropriate state management tools, 4) Implementing proper memoization, 5) Managing state persistence efficiently.

What are the strategies for reducing app startup time?

Startup optimization includes: 1) Using Hermes engine, 2) Implementing proper code splitting, 3) Optimizing native module initialization, 4) Managing asset loading, 5) Implementing proper splash screen, 6) Reducing initial bundle size.

How do you implement efficient layout calculations?

Layout optimization includes: 1) Using LayoutAnimation properly, 2) Minimizing layout depth, 3) Implementing proper flex layouts, 4) Managing dynamic layouts efficiently, 5) Using proper measurement techniques.

What are the techniques for profile and debug performance issues?

Profiling techniques include: 1) Using React DevTools, 2) Implementing performance monitoring, 3) Using native profiling tools, 4) Analyzing bridge traffic, 5) Monitoring memory usage, 6) Implementing proper logging.

How do you implement platform-specific native modules?

Native modules require separate implementations in Swift/Objective-C for iOS and Java/Kotlin for Android. This includes proper method mapping, event handling, and data type conversion while maintaining a consistent JavaScript interface.

What are the differences in navigation patterns between iOS and Android?

iOS typically uses edge swipe gestures and navbar buttons, while Android uses the back button and different navigation patterns. Navigation libraries need platform-specific configuration for proper behavior and animations.

How do you handle platform-specific animations?

Animation implementations may need platform-specific tuning for timing, easing, and performance. Native drivers might work differently, and some animations may need platform-specific implementations for optimal performance.

What are the key differences in debugging between iOS and Android?

Debugging tools and processes differ between platforms. iOS uses Xcode debugging tools while Android uses Android Studio. Chrome Developer Tools work differently, and native debugging requires platform-specific approaches.

How do you handle platform-specific push notifications?

Push notifications require different setup and handling for APNs (iOS) and FCM (Android). This includes different configuration, payload structures, and handling mechanisms while maintaining a consistent app experience.

What are the differences in app lifecycle handling between platforms?

App lifecycle events and background handling differ between iOS and Android. This includes different background modes, state restoration, and process lifecycle management requiring platform-specific implementations.

How do you handle platform-specific storage mechanisms?

Storage mechanisms like AsyncStorage have platform-specific implementations and limitations. Secure storage, file system access, and data persistence require different approaches and configurations per platform.

What are the key differences in performance optimization between platforms?

Performance optimization requires platform-specific approaches for memory management, UI rendering, and native module optimization. Different profiling tools and optimization techniques are needed for each platform.

How do you handle platform-specific network security?

Network security configuration differs between platforms, including SSL pinning, network permissions, and security policies. Different configuration files and implementation approaches are needed for each platform.

What are the approaches for handling platform-specific biometric authentication?

Biometric authentication requires different implementations for Touch ID/Face ID (iOS) and Fingerprint/Face Unlock (Android). This includes different APIs, security models, and user experience considerations.

How do you implement custom fonts in React Native?

Custom fonts require platform-specific setup: iOS needs font files added to the Xcode project and Info.plist, Android needs fonts in android/app/src/main/assets/fonts. React Native config needs updating, and linking may be required. Font names might differ between platforms.

How do you handle dynamic styling based on props or state?

Dynamic styling can be implemented using style arrays, conditional styles in objects, or dynamic style generation functions. StyleSheet.create should be used outside component render for performance. Consider memoization for complex style calculations.

What are the best practices for handling device orientation changes?

Orientation changes require responsive layouts using flex, Dimensions API updates handling, and potentially different layouts for portrait/landscape. useWindowDimensions hook helps track dimensions, and specific orientation styles may be needed.

How do you implement custom shadows across platforms?

Shadows require different implementations: iOS uses shadow* properties, Android uses elevation. Platform-specific shadow styles are needed for consistent appearance. Consider using libraries for cross-platform shadow implementation.

How do you handle keyboard avoidance in layouts?

KeyboardAvoidingView component with appropriate behavior prop ('height', 'position', 'padding') handles keyboard overlap. Platform-specific adjustments may be needed. Consider scroll view integration and input accessibility.

What are the approaches for implementing grid layouts?

Grid layouts can be implemented using FlatList with numColumns, flexbox with flex-wrap, or custom grid components. Consider performance for large grids, responsive behavior, and proper item sizing calculations.

How do you handle RTL (Right-to-Left) layouts?

RTL support requires proper use of start/end instead of left/right, handling text alignment, and considering layout direction. Use I18nManager for RTL control, and test layouts in both directions.

What are the strategies for handling different screen densities?

Screen density handling involves using density-independent pixels, proper image asset management (including @2x, @3x), and responsive design practices. Consider platform-specific density differences and testing on various devices.

How do you implement animated layouts?

Animated layouts use LayoutAnimation or Animated API. LayoutAnimation provides simple animations for layout changes. Complex animations might require Animated API with proper measurement and layout calculation.

What are the performance considerations for styling?

Style performance considerations include using StyleSheet.create, avoiding inline styles, minimizing style calculations in render, proper use of flex for layouts, and implementing efficient dynamic styling strategies.

How do you implement API caching?

API caching can be implemented using in-memory caching, AsyncStorage, or specialized caching libraries. Consider cache invalidation strategies, TTL (Time To Live), and proper cache updates when data changes.

What are the best practices for handling offline data synchronization?

Offline sync requires local storage of data, queue management for offline actions, conflict resolution strategies, and proper sync when online. Consider using libraries like WatermelonDB or implementing custom sync logic.

How do you handle file uploads in React Native?

File uploads require proper multipart/form-data handling, progress tracking, chunked uploads for large files, and proper error handling. Consider platform-specific file access APIs and compression before upload.

What are the strategies for API request cancellation?

Request cancellation can be implemented using AbortController with fetch, or cancelToken with Axios. Important for preventing memory leaks and unnecessary updates when components unmount or dependencies change.

How do you handle API rate limiting?

Rate limiting requires implementing request queuing, proper error handling for rate limit responses, exponential backoff for retries, and tracking request counts. Consider using libraries for request throttling.

What are Websockets and how are they implemented?

WebSockets provide real-time bidirectional communication. Implementation involves socket connection management, proper event handling, reconnection strategies, and state management for real-time data.

How do you handle API versioning in your app?

API versioning strategies include URL versioning, header versioning, or content negotiation. Apps should handle different API versions gracefully, possibly supporting multiple versions during transition periods.

What are the security considerations for API integration?

Security considerations include SSL/TLS, token management, certificate pinning, request/response encryption, and proper error handling. Avoid storing sensitive data in plain text and implement proper authentication flows.

How do you handle API response compression?

Response compression involves proper handling of Content-Encoding headers, decompression of gzipped responses, and optimization of data transfer. Consider implementing compression for requests when appropriate.

What are the strategies for API request batching?

Request batching involves combining multiple requests into single requests, implementing proper request queuing, and handling responses efficiently. Consider trade-offs between reduced network calls and increased complexity.

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Technical Interview Questions

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HR Interview Questions

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Why Prepare with Stark.ai for react-native Interviews?

Role-Specific Questions

  • Mobile Developer
  • React Native Developer
  • Full Stack Developer

Expert Insights

  • Deep dive into React Native components, state management, and performance optimization.

Real-World Scenarios

  • Building a cross-platform mobile app with complex animations and API integrations.

How Stark.ai Helps You Prepare for react-native Interviews

Mock Interviews

Simulate React Native-specific interview scenarios.

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Practice Coding Questions

Solve React Native development challenges tailored for interviews.

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Resume Optimization

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Tips to Ace Your react-native Interviews

Master React Native Components

Understand core components, props, and state management techniques.

Optimize Performance

Learn best practices for handling animations, rendering optimizations, and memory management.

Work with Native Modules

Understand how to integrate native code for platform-specific functionalities.

Debugging & Troubleshooting

Familiarize yourself with React Native debugging tools and common issue resolution techniques.

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