300 React JS Interview Questions and Answers September 2023

React JS Interview Questions and Answers Practice Test Quiz is designed to help React developers prepare for their job interviews by providing a comprehensive list of React interview questions and answers. The course covers basic concepts such as React components, state, and props, as well as advanced topics such as React Fiber and Redux.

Practice Test Highlights:

• List of 300 React interview questions and answers
• Quiz format with multiple-choice questions for easy self-assessment
• Detailed explanations of correct answers
• Organized by topic for focused learning
• Suitable for developers of all levels
• Can be used as a self-paced learning resource or for job interview preparation

We update our React JS question bank with fresh and relevant questions every month to ensure that you are well-prepared for your React JS interviews.

Below are some sample React JS questions and answers that are covered in our practice test. These questions come with detailed explanations and reference links to help you better understand the concepts:

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Sample Question 1:

What is the difference between Shadow DOM and Virtual DOM?

1. Shadow DOM is a browser feature, while Virtual DOM is a React feature

2. Shadow DOM is used for server-side rendering, while Virtual DOM is used for client-side rendering

3. Shadow DOM is used for styling and encapsulation, while Virtual DOM is used for performance optimization

4. There is no difference

Correct Answer

1. Shadow DOM is a browser feature, while Virtual DOM is a React feature

Explanation

Shadow DOM and Virtual DOM are two different concepts. Shadow DOM is a browser feature that allows developers to encapsulate styles and markup within components. Virtual DOM, on the other hand, is a React feature that allows for performance optimization by minimizing changes to the actual DOM.

[Reference Link]

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Sample Question 2:

What is JSX?

1. A testing framework

2. A JavaScript syntax extension

3. A new programming language

4. A design pattern

Correct Answer

2. A JavaScript syntax extension

Explanation

JSX is a JavaScript syntax extension that allows developers to write HTML-like code in JavaScript. JSX is not required to use React, but it is commonly used because it makes writing and managing UI components easier.

[Reference Link]

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This allows you to stay ahead of the curve and have an edge over other candidates by being up-to-date with the latest trends and developments in the React JS ecosystem. So, take our practice test now and stay ahead of the game!

React is currently one of the most popular front-end technologies used by companies in the industry. As a result, React has become a buzzword in the industry. If you are preparing for a job interview, it is important to be familiar with React. This tutorial is a compilation of ReactJS interview questions that cover a range of levels, from basic to advanced. These questions are commonly asked in interviews, so this tutorial is an excellent resource to help you prepare.

As technology advances, selecting the appropriate technology to develop an application or website is becoming increasingly challenging. React has emerged as the fastest growing JavaScript framework and is gaining popularity rapidly.

The demand for React Certification Training is growing exponentially as JavaScript tools establish their roots in the market. With a short learning curve, reusable components, and a clean abstraction, React is an obvious choice for front-end developers worldwide.

If you’re an aspiring front-end developer preparing for interviews, our Top 300 React Interview Questions blog will provide you with the necessary knowledge.

By taking this practice test, you’ll be able to identify areas where you need to improve and hone your skills to perfection.

Don’t miss out on the opportunity to stand out from the competition and impress your potential employers.

• Retake the React JS Interview Questions and Answers | Quiz as Many Times as You WantPractice makes perfect, and with this course, you can retake the exams as many times as you need to feel confident in your knowledge.
• Support from Instructors When You Need ItOur instructors are available to answer any questions you have and provide guidance along the way.
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Take this practice test now and give yourself the best chance to crack your next React JS interview!