Preparing for a React Native interview? Whether you’re a beginner or an experienced developer, these top 10 interview questions will help you ace your next job opportunity! ✅
1️⃣ What is React Native? How is it different from React.js?
Answer:
React Native is an open-source framework created by Meta for building mobile applications using JavaScript and React. Unlike React.js, which is used for building web applications, React Native renders mobile UI using native components instead of HTML & CSS.
Key Difference:
React.js → Web applications using React & Virtual DOM.
React Native → Mobile applications using native UI components.
2️⃣ How does React Native work?
Answer:
React Native bridges JavaScript and native code. It runs JavaScript in a separate thread using a JavaScript bridge, which communicates with native components via an asynchronous message queue.
3️⃣ What are the core components in React Native?
Answer:
React Native provides built-in UI components similar to HTML elements:
✅ <View> – Similar to <div> in web apps.
✅ <Text> – Like <p> for rendering text.
✅ <Image> – Used for displaying images.
✅ <TextInput> – User input field.
✅ <ScrollView> – Scrollable container.
✅ <FlatList> – Optimized list rendering.
4️⃣ How does React Native handle navigation?
Answer:
React Native doesn’t have built-in navigation but supports libraries like:
🔹 react-navigation (most popular) – Uses stack, tab, and drawer navigators.
🔹 react-native-navigation – A more native-like navigation solution.
Example using react-navigation:
`import { createStackNavigator } from '@react-navigation/stack';
const Stack = createStackNavigator();
export default function App() {
return (
<NavigationContainer>
<Stack.Navigator>
<Stack.Screen name="Home" component={HomeScreen} />
</Stack.Navigator>
</NavigationContainer>
);
}`
5️⃣ How do you handle state management in React Native?
Answer:
You can manage state using:
✅ React’s built-in useState & useReducer.
✅ Context API for global state.
✅ Third-party libraries like Redux, Zustand, Recoil.
6️⃣ What is Expo, and why should you use it?
Answer:
Expo is a toolchain that simplifies React Native development by providing:
✅ No need for Xcode or Android Studio.
✅ Easy setup and debugging.
✅ Pre-built APIs for camera, notifications, maps, and more.
To start an Expo project:
`npx create-expo-app myApp
cd myApp
npx expo start`
7️⃣ How does React Native communicate with native modules?
Answer:
React Native bridges JavaScript and native code using Native Modules. You can write platform-specific code in Swift (iOS) or Kotlin (Android) and call it in React Native using Native Modules.
Example: Creating a native module in Android (Kotlin):
class MyModule(reactContext: ReactApplicationContext) : ReactContextBaseJavaModule(reactContext) {
override fun getName(): String {
return "MyModule"
}
}
8️⃣ How do you optimize performance in React Native apps?
Answer:
🔹 Use FlatList for rendering large lists efficiently.
🔹 Enable Hermes Engine for better JavaScript execution.
🔹 Optimize image loading with react-native-fast-image.
🔹 Avoid unnecessary re-renders using memoization (React.memo, useMemo, useCallback).
9️⃣ How do you handle debugging in React Native?
Answer:
🔹 Use React Native Debugger for inspecting UI & Redux state.
🔹 Use console.log() for quick debugging.
🔹 Use Flipper for advanced debugging.
🔟 How does hot reloading work in React Native?
Answer:
React Native Hot Reloading allows developers to see code changes instantly without rebuilding the app. It listens for file changes and reloads only the modified components.
To enable Fast Refresh, ensure it’s turned on in the developer menu.
🎯 Final Thoughts
React Native is still a top choice for mobile development in 2025! If you’re preparing for a React Native interview, these questions should help you feel confident.
💬 What other questions do you think should be included? Let’s discuss in the comments! 🚀
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