Last Updated on September 3, 2023 by GeeksGod

Course : React JS Interview Questions & Answers for Beginners [2023]

React JS Interview Questions and Answers for Beginners | Updated [September 2023]

Welcome to the React JS Interview Questions and Answers – Practice Tests! This practice test is designed to help React developers prepare for their job interviews and crack them with confidence. With detailed explanations for each question, you’ll gain a deep understanding of the material covered in the tests.

By taking this practice test, you’ll be able to:

1. Sharpen your React JS knowledge
2. Get a feel for the types of questions you may encounter in an interview
3. Identify areas where you need to improve

Questions updated for 2023, you can be sure you’re getting the most current and relevant information.

React JS Interview Questions and Answers – Practice Tests

React JS Interview Questions and Answers – Practice Tests covers a wide range of React JS topics, so you can be sure you’re well-prepared for any question that comes your way.

Sample Question

When to use useCallback, useMemo and useEffect?

1. Option 1: useCallback to memoize function, useMemo to memoize value, useEffect to side effects
2. Option 2: useEffect to memoize function, useMemo to memoize value, useCallback to side effects
3. Option 3: useMemo to memoize function, useEffect to memoize value, useCallback to side effects
4. Option 4: useEffect to memoize value, useCallback to memoize function, useMemo to side effects

Correct Option: 1

Explanation: useCallback is used to memoize functions, meaning that if the dependencies have not changed, a previously created function is returned, avoiding unnecessary re-creations of functions. useMemo is used to memoize a value, meaning it only recomputes the value when one of the dependencies has changed. useEffect is used for performing side effects, such as data fetching, updating the state based on previous state, etc.

And if you need to brush up on a particular topic, don’t worry! You can retake the test as many times as you need.

In addition to the practice tests, you’ll have access to an active Q&A forum. This is a great place to ask questions, get help with any challenges you encounter, and connect with our Instructors.

And the best part? You’ll have lifetime access to the course, so you can come back and review the material whenever you need to. The practice test is also mobile compatible, so you can take it on-the-go and study at your convenience.

So what are you waiting for? Take this practice test today and make your first step towards acing your React JS interview!

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React JS Interview Questions for Beginners

React JS is a widely popular JavaScript library used for building user interfaces. If you’re a beginner and want to crack your React JS interview, here are some commonly asked questions to help you prepare:

1. What is React JS?

React JS is an open-source JavaScript library developed by Facebook. It allows developers to build reusable UI components and create rich web applications.

2. What are the key features of React JS?

Some key features of React JS include:

• Virtual DOM
• Component-Based Architecture
• Unidirectional Data Flow
• JSX Syntax
• Reusability

3. What is the difference between state and props in React JS?

In React JS, state and props are both used to manage and pass data to components, but they have some differences:

• State is managed within a component and can be updated using setState(). It is local and can be modified by the component itself.
• Props are passed to a component from its parent and are read-only. They should not be modified by the component that receives them.

These are just a few examples of the React JS interview questions you may encounter. Keep practicing and exploring to ace your interview.

React JS Interview Questions for Experienced Developers

If you have experience in React JS and want to level up your interview preparation, here are some advanced interview questions:

1. Explain the concept of hooks in React JS.

Hooks are a feature introduced in React JS 16.8. They allow developers to use state and other React features without writing a class component. Hooks provide a way to reuse stateful logic and make the code cleaner and easier to understand.

2. What is the significance of the useEffect() hook?

The useEffect() hook is used to perform side effects in functional components. It combines the functionalities of componentDidMount, componentDidUpdate, and componentWillUnmount from class components into a single hook. It is commonly used for data fetching, subscribing to events, and modifying the DOM.

3. How does React Router work?

React Router is a popular routing library for React JS applications. It allows developers to handle navigation and routing in a declarative way. React Router uses the concept of components to define different routes and render the appropriate component based on the URL.

These are just a few examples of the advanced React JS interview questions. Make sure to dive deeper into each topic and explore more questions to enhance your knowledge and boost your chances of success.

Conclusion

In conclusion, the React JS Interview Questions and Answers – Practice Tests provide a comprehensive resource for React developers to prepare for their job interviews. With detailed explanations, sample questions, and the ability to retake the test multiple times, you can enhance your knowledge and confidence. Additionally, the Q&A forum and lifetime access to the course add further value. Don’t forget to stay updated with the latest Free Udemy Coupon codes to make your learning journey even more rewarding. Start your preparation today and take a step towards acing your React JS interview!