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Intro to ReactJS Application

In this article we will learn about Intro to ReactJS Application. React is a modular Javascript library created by Facebook which helps to make web apps fast and efficient with minimal coding. In this blog, we will make a simple React application that can be used to compare different products. Please read my previous article of Global Error Handling in Angular.

What is ReactJS?

ReactJS is a JavaScript library for creating reusable UI components that is declarative, efficient, and versatile. It is an open-source, component-based front end library that is exclusively responsible for the application’s view layer. It was created and maintained by Facebook and was later utilized in its products such as WhatsApp and Instagram.

React is a modular Javascript library created by Facebook which helps to make web apps fast and efficient with minimal coding.

ReactJS- Building Your First React App

Why we use ReactJS?

The main objective of ReactJS is to develop User Interfaces (UI) that improves the speed of the apps. It uses virtual DOM (JavaScript object), which improves the performance of the app. The JavaScript virtual DOM is faster than the regular DOM. We can use ReactJS on the client and server-side as well as with other frameworks. It uses component and data patterns that improve readability and helps to maintain larger apps.

Advantages of using ReactJs

  • Easy to learn and easy to use – React comes with a good supply of documentation and tutorials. Anyone who does JavaScript can easily understand React and start using it in just a few days.
  • Reusable components – React allows a developer to break the app into smaller components that can be reused later hence minimizing the codebase. We will understand more about components in the next section.
  • Use of virtual DOM – DOM manipulation is one of the most expensive tasks for any framework, especially when the application is big. React solves this issue by using a Virtual DOM, which is basically a lightweight copy of the Real DOM. It is only an in-memory representation and is not rendered on the actual screen. Instead of rendering the whole DOM again, React compares the changes in Virtual DOM and then renders it in the Real DOM accordingly.
  • Easy to write JSX – JSX is just a combination of HTML and Javascript. It makes coding a lot easier and also helps in preventing injection attacks like XSS.
  • Dynamic properties & states: Elements and components within React can be given states and properties (props). These states and props can be change, and passed down to other elements and components within it the app. This allows for more reusable code and better organization.
  • React is Independent of the rest of the application: If you want to use React, and integrate a back end database with MongoDB, or any other framework, you can easily do so.

A ReactJS application is composed of several components, each of which is responsible for producing a short, reusable piece of HTML code. All React apps are built around components. These Components can be stacked with other components to create sophisticated applications from simple building blocks. To populate data in the HTML DOM, ReactJS use a virtual DOM-based technique. The virtual DOM is fast because it simply modifies individual DOM items rather than reloading the entire DOM every time.

We write React components that correlate to various parts to make a React app. These components are organised into higher level components that comprise the application structure. Consider a form with numerous features such as input fields, labels, or buttons. Each form element can be written as a React component, and then combined into a higher-level component, i.e., the form component itself. The form components would define the form’s structure as well as the elements contained within it.

Top Companies/Brands Using ReactJS Development

Below are the list of companies they are using ReactJs

  • Facebook
  • Instagram
  • Twitter
  • Netflix
  • Yahoo! Mail
  • WhatsApp
  • Dropbox
  • Atlassian
  • Salesforce and many more……


This article we discussed about Intro to ReactJS Application, here we discussed ReactJS advantages and ehy we need to learn Reactjs. React is a modular Javascript library created by Facebook which helps to make web apps fast and efficient with minimal coding.

Leave behind your valuable queries and suggestions in the comment section below. Also, if you think this article helps you, do not forget to share this with your developer community. Happy Coding 🙂

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