Introduction Of React Js

 Introduction Of React Js



What is React Js ?

React is a front-end JavaScript library for creating user interfaces based on UI components that is free and open-source. Facebook is the company that created and published React. React can be used as a base in the development of single-page, mobile, or server-rendered applications with frameworks like Next.js. Also it handles the view layer in web and mobile apps. We can also make reusable user interface components with React.

The MVC (model view controller) design is now used by the majority of websites. React is the 'V' in MVC architecture, which stands for view, whereas Redux or Flux provides the architecture.


Why are we learn React Js?

Although there are numerous JavaScript frameworks available today (such as Angular and Node), React was the first to enter the market and quickly garnered popularity. The earlier frameworks used the DOM to follow the usual data flow structure (Document Object Model). When a web page is loaded, the browser creates a document object (DOM). It dynamically adds or removes data on the back end, and when any changes are made, a new DOM is built for the same page each time. This frequent DOM construction wastes memory and slows down the application's speed.

As a result, the ReactJS framework was created, which removes this flaw. ReactJS allows you to break down your app into individual components. ReactJS uses the same traditional data flow as before, but it does not operate directly on the browser's Document Object Model (DOM); instead, it uses a virtual DOM.

What are the features of ReactJS ?

React has a lot of specific features that have helped it become the most widely used frontend development library.



  •  JSX(JavaScript Syntax Extension) - HTML and JavaScript are combined in JSX. JavaScript objects can be inserted into HTML elements. Because browsers do not support JSX, the code is transcompiled into JavaScript by the Babel compiler. JSX makes coding simple and straightforward.
  • One-way Data Binding - One-way data binding is a one-direction flow, as the name implies. In react, data only goes in one direction, from top to bottom, from parent components to child components. The child component's properties (props) cannot return data to its parent component, but they can communicate with it to change the states based on the inputs. One-way data binding operates in this manner. Everything remains modular and quick as a result.
  • Performance - As previously mentioned, react makes use of a virtual DOM and only updates the portions that have changed. As a result, the DOM runs faster. Because the DOM runs in memory, we can create independent components, making the DOM run quicker.
  • Components - Because it is component-based, React.js separates the web page into numerous components. Each component is part of the UI design and has its own logic and design. As a result, component logic written in JavaScript is simple to use, runs quickly, and can be reused.
  • Virtual DOM - Document Object Model stands for Document Object Model. It is the most important factor of the web since it splits the code into modules and executes it. JavaScript Frameworks typically update the entire DOM at once, making the online application slow. However, react makes use of virtual DOM, which is a copy of real DOM. When a web application is modified, the virtual DOM is updated first, and the difference between the real DOM and the virtual DOM is determined. When it discovers the difference, DOM just updates the parts that have changed recently, leaving the rest unchanged.
  • Simplicity - React.js is a component-based framework that makes code reusable, and it uses JSX, a combination of HTML and JavaScript. This reduces the amount of code and makes it easier to comprehend and troubleshoot. 

Let's see what are the advantages of React Js

React JS has numerous advantages. Let's look at the main advantages of React JS to see why it's different from other front-end development frameworks. 


  • It’s easy to learn
  • It helps to build rich user interfaces
  • It offers fast rendering
  • It comes with useful developer toolset
  • Template designing made easy
  • It's  SEO Friendly
  • Used on client as well as server side.
  • The Benefit of Having JavaScript Library
Thank you for reading my blog. I hope you have a clear idea about React Js now.
















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