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What is React JS ? Know the features of React JS

Last updated on 28th Jan 2023, Artciles, Blog

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Divan Singh (Java Developer )

Divan Singh is a Java developer and contributes in-depth articles on various big data technologies. He also has experience with Hadoop, microservices, Commvault, and a few BI tools. And he has expertise in Python, R, Java, Ruby, Pig, SQL, Hadoop, HDFS, Yarn, Mahout, Pig, Hive, Spark, Power BI, SSRS, Tableau, BOBJ, and Cognos.

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    • In this article you will get
    • What is ReactJS?
    • Why do people choose to program with the React?
    • ReactJS Features
    • Building Components of a React JS
    • ReactJS Advantages
    • Conclusion

What is ReactJS?

To build the composable user interfaces predictably and efficiently using a declarative code, It’s an open-source and a component-based framework responsible for creating a application’s view layer.ReactJs follows a Model View Controller (MVC) architecture, and view layer is an accountable for handling a mobile and web apps.React is famous for the building single-page applications and also mobile apps.

ReactJS MVC architecture

Why do people choose to program with the React?

Fast:A Feel quick and responsive through an Apps made in React can be handle complex updates.

Modular:Allow to write a many smaller, reusable files instead of a writing large, dense files of code. A modularity of a React is an attractive solution for a JavaScript’s visibility problems.

Scalable:React performs best in case of a large programs that display the lot of data changes.

Flexible:React approaches differently by breaking them into the components while building a user interfaces. This is incredibly important in big applications.

Popular:ReactJS gives a better performance than the other JavaScript languages due to t’s implementation of the virtual DOM.

Easy to learn:Since it needs a minimal understanding of a HTML and JavaScript, the learning curve is a low.

Server-side rendering and SEO friendly:ReactJS websites are popular for their server-side rendering feature. It makes a apps faster and much better for a search engine ranking in comparison to the products with a client-side rendering. React even produces are more opportunities for a website SEO and can occupy higher positions on search result’s page.

Reusable UI components:a React improves the development and a debugging processes.

Community:The number of a tools and extensions available for a ReactJS developers is tremendous. Along with an impressive out-of-box functionalities, more opportunities emerge once a discover how giant a React galaxy is Hence, it’s more reliable tool for a website development.

ReactJS Features

1.JSX – JavaScript Syntax Extension:

JSX is the preferable choice for more web developers. It isn’t necessary to use a JSX in React development, but there is a big difference between writing a react.js documents in a JSX and JavaScript. JSX is a syntax extension to a JavaScript. By using that, and can write HTML structures in a same file that contains a JavaScript code.

2.Unidirectional Data Flow and Flux:

If data has to flow in the another direction, and will need a additional feature.React contains a set of immutable values passed to a component renderer as a properties in a HTML tags. The components are cannot be modify any properties directly but support to call back function to do modifications.

3.Virtual Document Object Model (VDOM):

A React contains a lightweight representation of a real DOM in memory called a Virtual DOM. A Manipulating real DOM is more slower compared to VDOM as nothing gets drawn on a screen. When any object’s state modify, VDOM modifies only that a object in real DOM instead of updating a whole objects. That makes things are be move fast, particularly compared with the other front-end technologies that have to an update an each object even if only a single object changes in web application.


React supports a various extensions for the application architecture. It supports a server-side rendering, an extensively in a web app development. React Native is a famous framework developed from React for the creating cross-compatible mobile apps.


Testing React apps is simple due to large community support. Even a Facebook offers a small browser extension that makes a React debugging easier and faster.

Building Components of a React JS

1.ReactJS Components:

Components are heart and soul of a React. Components (like JavaScript functions) let split the UI into an independent, reusable pieces and think about every piece in isolation.Each component has its structures, APIs, and methods.

Functional Components:These components are have no state of their own and contain only a render method. They are simply a Javascript functions that may or may not be receive a data as parameters.

Class Components:These components are much complex than functional components. They can manage a state and to return a JSX on the screen have the separate render method. And can pass a data from one class to the other class components.

2.React State:

A state is the place from where a data comes. The state in the component can change over a time, and whenever it changes, the component re-renders.A change in the state can happen as a response to a system-generated events or user action, and these changes are explain the component’s behavior and how it will be render.The state object is an initialized in constructor, and it can save a multiple properties.For changing a state object value, use this.setState() function.To perform the merge between a new and the previous state, use a setState() function.

3.React Props:

Props stand for the properties, and they are be read-only components.Both Props and a State are plain JavaScript objects and hold a data that are influence the output of render. And they are varient in one way: State is managed within a component (like a variable declaration within a function), whereas props are get passed to a component (like a function parameters).Props are an immutable, and this is why a component of a container should explain the state that can be changed and also updated, while the child components should only send a data from a state using properties.

4.React Keys:

In a React, Keys are useful when working with the dynamically created components. Setting a key value will maintain a component uniquely identified after change.They help to React in identifying a items which have changed, are removed, or be added.

Features of ReactJS

ReactJS Advantages

  • React.js creates its a own virtual DOM. This will improve the apps performance since JavaScript virtual DOM is faster than a regular DOM.
  • ReactJS helps to create an awesome UI.
  • ReactJS is a SEO-friendly.
  • Component and Data patterns are improve readability which helps to keep a larger apps.
  • React can be used with the other frameworks.
  • React simplifies a complete process of scripting environment.
  • It facilitates an advanced maintenance and increases a productivity.
  • Ensures a faster rendering.
  • The best thing about a React is the provision of script for a mobile app development.
  • A strong community backs to ReactJS.
  • React JS comes with the helpful developer toolset.
  • Both startups and a fortune 500 companies are use React.


React is a famous JavaScript library used for a web development. React.js or ReactJS or React are various ways to represent a ReactJS. Today’s many are large-scale companies (Netflix, Instagram, to name few) also use a React JS. There are many advantages of using this framework over the other frameworks, and It’s ranking under a top 10 programming languages for a last few years under different language ranking indices.

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