Looking to build your career as a ReactJS developer? Wondering what are the most asked ReactJS interview questions for freshers and experienced? How rewarding is a career in this field? You will find all your answers in this comprehensive write-up.
As per Statista, React.js is the second most used web framework around the world. It is not surprising to know that this web application framework is becoming immensely popular because of the benefits it offers.
For example, top brands like Uber, Instagram, Walmart, Myntra, Pinterest, Airbnb, and Netflix use React for higher scalability, speed, as well as SEO advantages. As a result, the demand for React developers is highly increasing in the market today.
If you have done a web development course or MERN Stack Course, the next step is to appear for the interview. During the process, you will be asked a lot of basic to advanced level of questions.
To make things easier for you, we have covered the top ReactJS interview questions and answers for freshers and experienced professionals (senior developers) both.
Suggested Reading: Top 65 Django Interview Questions and Answers
ReactJS Interview Questions and Answers for Freshers
1. What is ReactJS?
ReactJS is an open-source, component-based front-end JavaScript library essential for the view layer of the application. It is supported by Facebook.
ReactJS utilizes a virtual DOM-based structure to fill in the information in HTML DOM. The virtual DOM works quickly, possessing a way that it only modifies single DOM components rather than refreshing the complete DOM every time.
The React application comprises several components, each answerable for outputting a small, reusable part of HTML. Components can be embedded inside other components to permit complex applications to work out of basic building blocks.
A component can also support an internal state. For instance, a TabList component can save a variable compared to the directly open tab.
2. What are the benefits of ReactJS?
The main advantages of ReactJS are as follows:
a) Easy to learn
ReactJS is not a core but a JS library that takes together objects and targets a specific thing to complete it effectively. It is the view controller in the MVC structure. Any developer who learns JavaScript can interpret React, master its fundamentals, and develop a fantastic app.
b) Reusable Components
Reusing components is the primary feature of React JS. Even Facebook has executed React as it supports the reuse of framework components. A developer can begin with numerous components like a checkbox, button, etc.
We develop wrapper components made out of those smaller components. Then, we write higher-level wrapper components. It goes on like that until we have this one root component, and that component is our app.
c) Virtual DOM
When we are about to build a web application with high customer connection and view updates, similar to the new form-maker on JotForm 4.0, we have to consider the available execution problem.
Updating DOM is generally the bottleneck concerning web execution. React attempts to understand this issue by utilizing virtual DOM and a DOM kept in memory.
d) Flux and Redux architecture
Facebook developed Flux architecture for its various web applications. It is like React components in its unidirectional flow. This structure has action creators that facilitate making action from method parameters. It also supports a library for these methods.
All these actions are supported together by a focal dispatcher to refresh stores. All views are restored according to the stores. There is likewise Redux, which is an upgraded version of flux architecture.
It has an individual store which is not needed in flux. Redux also allows a feature where middleware can be characterized to capture dispatched actions.
e) SEO-Friendly
SEO is the pillar of a strong business. A superior ranking is equivalent to more commitment from the person, which results in more income.
In addition, ReactJS generally provides a quicker speed by decreasing the time of page load, which is crucial for SEO.
f) Developer Tools
The React Developer Tools have been described as Chrome and Firefox dev extensions and permit us to review the React component order in the virtual DOM.
It also allows us to choose specific components and check and alter their current props and state.
g) Scope for Code Testing
The applications of ReactJS are simple to set. Moreover, it allows developers to test and debug their programs using native tools quickly.
h) Performance Enhancement
ReactJS improves execution because of virtual DOM. The DOM is a cross-platform programming API that manages with HTML, XML, or XHTML.
Some developers face the issue when updating the DOM, which hinders the application’s performance. ReactJS solved this problem by representing virtual DOM.
The React Virtual DOM exists in memory and is a definition of the internet browser's DOM. When we compose a React element, we do not correspond precisely to the DOM.
Instead, we are comprising virtual elements that React will pass into the DOM, enabling smoother and quicker performance.
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Frequently Asked Questions
Land your dream job by preparing with most asked ReactJS interview questions and answers (for both freshers & experienced professionals). This guide provides structured insights, proven methodologies, and actionable execution steps for modern professionals.
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