React Native Interview Questions and Answers

Ques 1. Explain the concept of 'Redux' in React Native.

Redux is a state management library for React Native applications. It centralizes the application's state and allows for predictable state changes through actions and reducers.

Ques 2. How can you optimize performance in a React Native app?

Performance optimization in React Native can be achieved by using PureComponent, memoization, optimizing renders, and using tools like React DevTools.

Ques 3. Explain the concept of 'Native Modules' in React Native.

Native Modules allow developers to write native code in Java, Objective-C, or Swift and expose it to the JavaScript thread in a React Native app. They are used for tasks that cannot be accomplished with JavaScript alone.

Ques 4. What is the purpose of the 'React Native Bridge'?

The React Native Bridge is a communication layer between the JavaScript code and the native code in React Native. It enables the execution of native code from the JavaScript thread.

Ques 5. What is the purpose of the 'Animated' API in React Native?

The 'Animated' API in React Native is used for creating smooth animations. It provides a way to animate the style properties of components, such as opacity and position.

Example:

import { Animated } from 'react-native';

const fadeAnim = new Animated.Value(0);

Animated.timing(fadeAnim, {
  toValue: 1,
  duration: 1000,
}).start();