Introduction to ReactJS

What is React?

React is a JavaScript library for building user-interfaces. It is the view layer of web applications. React was created by Jordan Ealke, a software engineer at Facebook and open sourced it to the world by Facebook & Instagram. Broadly speaking, to write React applications, we write React components that correspond to various interface elements.

System Configuration

To install create-reacte-app, follow the below steps.

1. Install node.js with version 14+ from node.js office site. Check the node version installed in your machine by

node -v

1. Install create-react-app by running this command

npm install -g create-react-app

1. Once the installation is done, create a React app using

npx create-react-app my-app

Here, my-app will be your application's name.

Forder Structure Description

• node_modules: All the modules dependencies are created in this folder
• public: Contains the public static assets of the application
• public/index.html: First page loaded, when you run the application
• src: All application related files are created in this folder
• src/index.js: Entry point of the application ## Features of React
• React is a small library
• React covers only the rendering and event handling part.
• Presentation code in JavaScript powered by JSX
• Code size is smaller hence it is faster than Angular etc.
• Flexible
• Virtual DOM