What is React.js? (Uses, Examples, & More)

What is React.js?

Facebook created the open-source React.js framework and library for JavaScript. In comparison to using pure JavaScript, it is used to rapidly and effectively create interactive user interfaces and online applications.

By building reusable components—which you may conceive of as separate Lego blocks—you design your apps with React. These parts are fragments of a complete interface that, when put together, make up the whole user interface for the program.

By offering the finest and most effective rendering execution, React’s main function in an application is to manage the view layer of that application, much like the V in a model-view-controller (MVC) paradigm. React.js encourages developers to break down these sophisticated user interfaces into distinct, reusable components that serve as the foundation for the entire UI rather than treating the entire UI as a single entity. This allows the ReactJS framework to render web pages more quickly and develop highly dynamic and responsive online apps by combining the speed and efficiency of JavaScript with a more effective way to manipulate the DOM.

A Brief History of React.js

Facebook had a difficult year in 2011 and had a sizable user base. By creating a faster, more responsive, and more dynamic user interface, it hoped to give users a richer user experience.

React was developed to accomplish this by one of Facebook’s software developers, Jordan Walke. By offering a more organized and structured method of creating dynamic and interactive user interfaces with reusable components, React streamlined the development process.

It was originally used on Facebook’s newsfeed. React fundamentally altered Facebook’s online development strategy as a result of its ground-breaking user interface and DOM manipulation techniques, and it swiftly gained popularity in the JavaScript ecosystem after being made available to the open-source community.

What does React.js do?

A web page is typically request by entering its URL into your web browser. Then, after receiving a request for that webpage, your browser renders it. A fresh request is made to the server to obtain the new page if you click a link on that page to navigate to another page of the website.

Every new page or resource you attempt to access on a website involves the same back-and-forth loading process between your browser (the client) and the server. This common method of website loading is quite adequate, but think about a website that is heavily dependent on data. The user experience would be terrible due to the repeated back-and-forth loading of the entire webpage.

Furthermore, updating the DOM to reflect data changes in a typical JavaScript application involves manual intervention. A complete page reload is require when you determine which data changed and update the DOM to reflect those changes.

React adopts a different strategy by enabling the creation of single-page applications (SPAs). On the first request, a single-page application loads just one HTML file. Then, it uses JavaScript to change the necessary section, content, or body of the webpage.


Because the client doesn’t have to refresh the entire webpage to receive a new page. Whenever a user submits a new request, this pattern is know as “client-side routing.” Instead of forcing a full page reload, React intercepts the request and just retrieves and modifies the relevant areas. Better performance and a more dynamic user experience are the outcomes of this strategy.

A virtual DOM, which is a duplicate of the real DOM, is use by React. Every time the data state changes, React’s virtual DOM is instantaneously update to reflect the new modification. React then determines what has changed by comparing the virtual DOM to the real DOM.

React then determines how to update the actual DOM in the least costly manner without rendering the actual DOM. Since you don’t have to refresh the entire page every time something changes, React’s components and UIs immediately reflect the changes.

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How to use React.js

React does not impose specific guidelines for coding standards or file management, unlike other frameworks like Angular. This implies that programmers and teams are free to establish the norms that work best for them and implement React as they see fit. Due to React’s versatility, you may utilise it as much or as little as you require.

You may build your complete app’s user interface with React, just one button, or a few interface elements. Depending on your needs, you can either gradually embrace it and sprinkle some interaction into an already-existing application or, even better, utilise it to create fully-fledged, sophisticated React apps from scratch.

Plugging React into a Website

To add some interaction to that HTML page, you may integrate React into an already-existing online app using a content delivery network (CDN). React then has authority over that particular area of the page, such as a widget, sidebar, or something else completely. They are just reusable, interactive React components with a dash of React functionality.

In only three easy steps, you can do that.

The two primary CDN scripts need to be included in your website’s HTML index file as the initial step. To load React into your app using a CDN provider, you require these scripts.

Creating a Fully-Fledged React App

It is more feasible to use React to construct full-fledged web applications rather than just adding minor elements of an interface to an already-existing web application. React does, on the other hand, potentially have significant tooling setup needs that are sometimes difficult and time-consuming to set up when developing new React apps.

Fortunately, you don’t use become familiar with this build configuration or set up the build tools yourself. To assist you in creating a boilerplate version of a React application, simba institute developed a package it  called reactjs Training in surat. With this course package, you can get started right away and enjoy using React apps that have a recognisable structure across all of your React projects.

Creating a new React project is as simple as running the following commands in your terminal:

React.js Examples

React has grown in popularity and stability as a result of its capacity to build online apps that are quick, effective, and scalable. It is being used by thousands of online apps, including both established businesses and fresh startups. Among those mentioned are:

  • Facebook
  • Instagram
  • Netflix
  • Reddit
  • Uber
  • Airbnb
  • The New York Times
  • Khan Academy
  • Codecademy
  • SoundCloud
  • Discord
  • WhatsApp Web

React has also grown more robust and can now be used to build native mobile applications using React Native and desktop apps using Electron.js.

Getting Started With React.JS

This article described React.js, gave its background, and demonstrated how React enhances JavaScript’s functionality. In order to demonstrate why developers use React.js over just using JavaScript, it also offered some examples of how developers use React.js, as well as a few quick code samples showing React.js code and syntax. The article’s conclusion included several actual instances of well-known apps created with React.js.

React is a great option for developers searching for a simple-to-use and highly effective JavaScript framework since it offers cutting-edge capabilities. With JavaScript-driven pages and React, you can create intricate UI interactions that connect with the server quickly. Bid adieu to pointless full-page reloads and begin using React while creating.


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