Top React JS Developer Interview Questions Answers

React JS is a highly popular software tool and using it provides numerous benefits for businesses. Career opportunities in React JS are flexible, well-paying, and full of growth opportunities and exposure. React JS developers are in high demand and companies are willing to pay handsome salary amounts to these professionals. Below are some leading careers you can explore after learning React JS.

• Front-End Developer

• UI/UX Developer

• JavaScript Developer

• Mobile App Developer

• Technical Consultant

• Framework Developer

• Freelance Developer

How to Clear React JS Interview?

It is necessary yourself fully before applying for the React JS front-end web development position. To prepare for the interview, you can enroll in the companies that provide the Best React JS Courses. This training will provide you with great knowledge of the React JS course. Whenever you give the React JS job interview, the interviewer expects you to fully explain your qualifications and skills. For this, you need to create a portfolio and showcase your skills and projects you have completed in the past. In the interview, be prepared to discuss your skills and experience with programming languages, tools, and frameworks.

Along with it, the interviewer wishes to see your understanding of the latest trends and technologies in web development. So, prepare yourself to talk about past projects and how you approached solving various challenges. Along with it, showcase your problem-solving skills and tell them how you have solved various challenges. Finally, highlight your strengths and let the interviewers know your area areas of expertise.

Top React JS Developer Interview Questions?

Here are some top React JS Interview questions you can go through before the interview.

What is the significance of keys in React?

React JS comes with keys that are useful for identifying unique VDOM Elements with their corresponding data driving the UI. In addition, these keys are useful for optimizing rendering by recycling existing DOM elements. It allows React JS to re-order the DOM elements rather than rendering lots of nested DOM changes.

What is the significance of refs in React?

Refs are added like an attribute to a React.createElement() call. For example, <li ref="someName"/>. Refs provide simple and quick access to the DOM Element. In addition, these Refs can be in any form which is either a string or a function.

How are React Router and its techniques different from traditional JavaScript routers?

“Traditional” routers use a predefined set of routes and each route in it defines a series of actions when a route is triggered. On the other hand, the React router focuses on “single-level” routing and enables the creation of HOCs.

What are the advantages and disadvantages of shallow rendering components in tests?

• The advantages of shallow rendering are as follows- Shallow rendering of a component is faster than fully rendering it. This is because the React project contains a large number of components that can have a significant impact on the time of unit test to execute. Shallow rendering is quick as it prevents testing outside the boundaries of the component.
• Coming to its disadvantages are as follows- Shallow rendering differs to some extent from the real-world usage of a component as part of an application. So, it is possible that it may not catch certain issues.

Name some common approaches for styling a React Application

Some common approaches are as follows:

• CSS Classes - Developers use the CSS classes for styling as they are already familiar with the approach.
• Inline CSS - Using inline CSS for styling React elements ensures that styles can be completely scoped to an element.
• Pre-processors - These are often used on React projects because they are well-understood by developers.
• CSS-in-JS Modules - They are a popular option for styling because they integrate closely with React components.

Conclusion

Using React JS, a widely used software application, has many advantages for organizations. You can enroll in the Best React JS Courses offering firms to help you prepare for the interview. Prepare to talk about your knowledge of programming languages, tools, and frameworks throughout the interview. The interviewer also wants to see that you are aware of the most recent developments in web development in terms of trends and technologies. At last, show off your problem-solving abilities and describe the difficulties you have overcome.