React Native Interview Questions (2024)

Hello, React Native enthusiasts! If you're finding yourself at the doorstep of a React Native interview in 2024, you're in for an exciting ride. As technology continues to sprint forward, so does the landscape of interview questions.

Whether you're a seasoned developer or just starting your journey with React Native, the anticipation of an interview can be both exhilarating and nerve-wracking.

In this article, I've got your back! We'll be exploring the top React Native interview questions that might come your way in 2024.

So, let's see react native interview questions 2024, 2024 react native interview questions, interview questions react native, react native interview questions for freshers.

ReactJS - React is a JavaScript library designed for constructing responsive user interfaces in the context of web application development.

React Native - It is a framework specifically tailored for building mobile applications, providing a native look and feel across both iOS and Android platforms.

Syntax: Both React and React Native utilize JSX (JavaScript XML) syntax. However, there's a distinction in the tags used:

• React uses HTML tags like <div>, <h1>, <p>, etc.
• React Native employs different tags such as <View>, <Text>, etc., to create a mobile-friendly user interface.

Animation and Gestures:

• React relies heavily on CSS animations to achieve dynamic effects on web pages.
• In React Native, the recommended approach for animating components is to leverage the Animated API provided by the framework. This ensures smooth and efficient animations in the mobile application context.

Routing Mechanism:

• React relies on external libraries like react-router for implementing routing in web applications. It does not inherently possess built-in routing capabilities.
• React Native, on the other hand, comes with a built-in Navigator library, streamlining the process of navigation within mobile applications. This built-in feature simplifies the handling of navigation-related tasks in React Native development.

REACT JS	REACT NATIVE
It is used for developing web applications.	It is used for developing mobile applications.
It uses React-router for navigating web pages.	It has a built-in navigator library for navigating mobile applications.
It uses HTML tags.	It does not use HTML tags.
It provides high security.	It provides low security in comparison to ReactJS.
In this, the virtual DOM renders the browser code.	In this, Native uses its API to render code for mobile applications.

 

React Native currently operates with three distinct threads:

1. MAIN/UI Thread: The MAIN/UI Thread is the primary application thread where your Android or iOS app runs. This thread is responsible for handling the user interface (UI) of the application. It has the capability to modify and interact with the UI elements directly.

All user interactions and UI updates are managed by the Main Thread.

2. Shadow Thread: The Shadow Thread operates as a background thread and is employed for calculating the layout created using the React library in React Native. It works behind the scenes to compute the styling and layout information before applying it to the UI.

This asynchronous process ensures a responsive user interface by offloading layout calculations to a separate thread.

3. JavaScript Thread: The JavaScript Thread is dedicated to executing the main JavaScript code of your React Native application. It handles tasks such as data processing, business logic, and communication with the server. This thread ensures the smooth functioning of your application's logic.

It is worth noting that heavy computations or time-consuming operations in the JavaScript Thread can potentially affect the responsiveness of the UI, emphasizing the importance of optimizing code execution in this thread

 

In React Native, state is a fundamental concept used to manage and control the dynamic aspects of components. It serves as a storage mechanism for variable data that may change during the lifecycle of a component.

The state is particularly useful for storing information that might be modified in response to user interactions or other events within the component. It is mutable, meaning the values stored in the state can be updated or modified as needed during the component's lifecycle.

import React, {Component} from 'react';    
import { Text, View } from 'react-native';    
export default class App extends Component {    
 state = { 
myState: 'State of Text Component'
              }
updateState = () => this.setState({myState: 'The state is updated'})
render() {
return (
<View>    
<Text onPress={this.updateState}> {this.state.myState} </Text>    
</View> 
); 
} 
}

 

Props Drilling refers to the scenario in a React Native application where props need to be passed through multiple layers of components, even though some intermediary components do not directly use those props.

This can make the codebase less maintainable and hinder the component's reusability.

To avoid Props Drilling, consider implementing one of the following strategies:

Context API:

Utilize React's Context API to create a context that holds the shared state or values. This way, components can access the required data without passing it down through every level explicitly.

// Context creation
const MyContext = React.createContext();

// Providing data at the top level
const App = () => {
  const sharedData = /* data to be shared */;
  return (
    <MyContext.Provider value={sharedData}>
      {/* Your component hierarchy */}
    </MyContext.Provider>
  );
};

// Consuming data in a nested component
const MyComponent = () => {
  const data = React.useContext(MyContext);
  // Use data as needed
};

 

Redux State Management:

Integrate Redux to manage the global state of your React Native application. With Redux, components can access the shared state without relying on props drilling.

// Actions, reducers, and store setup in Redux
// (Note: Requires installation of redux and react-redux packages)

// Accessing data in a component
import { connect } from 'react-redux';

const MyComponent = ({ sharedData }) => {
  // Use sharedData as needed
};

const mapStateToProps = (state) => ({
  sharedData: state.sharedData,
});

export default connect(mapStateToProps)(MyComponent);

 

Higher-Order Components (HOCs) or Render Props:

Leverage HOCs or Render Props patterns to encapsulate the logic of passing props and provide cleaner abstractions. These techniques enable components to access shared data without explicitly passing it through every intermediate component.

// Example of a higher-order component (HOC)
const withSharedData = (WrappedComponent) => {
  const sharedData = /* data to be shared */;

  return (props) => (
    <WrappedComponent {...props} sharedData={sharedData} />
  );
};

// Usage in a component
const MyComponent = ({ sharedData }) => {
  // Use sharedData as needed
};

export default withSharedData(MyComponent);

 

React Native utilizes the Fetch API to address networking requirements. To retrieve content from a specific URL, we can utilize the fetch function by passing the desired URL as an argument:

fetch('https://test.com/endpoint/', {
 method: 'POST',
 headers: {
   Accept: 'application/json',
   'Content-Type': 'application/json'
 },
 body: JSON.stringify({
   firstParam: 'firstValue',
   secondParam: 'secondValue'
 })
});

Networking is inherently an asynchronous operation. Fetch methods return a Promise, simplifying the process of writing code that operates asynchronously.

const getMoviesFromApi = () => {
 return fetch('https://test.com/movies.json')
   .then((response) => response.json())
   .then((json) => {
     return json.movies;
   })
   .catch((error) => {
     console.error(error);
   });
};

The XMLHttpRequest API is integrated into React Native. As both Frisbee and Axios utilize the XMLHttpRequest, we can seamlessly incorporate these libraries into React Native applications.

var request = new XMLHttpRequest();
request.onreadystatechange = (e) => {
 if (request.readyState !== 4) {
   return;
 }

 if (request.status === 200) {
   console.log('success', request.responseText);
 } else {
   console.warn('error');
 }
};

request.open('GET', 'https://test.com/endpoint/');
request.send();

 

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