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Introduction of React JS

ReactJS is a popular JavaScript library that was created by Facebook and is used to build web applications. It is known for its simplicity, flexibility, and reusability, making it a popular choice among developers. ReactJS is based on the concept of components, which are self-contained building blocks that can be reused across different parts of an application.

In this comprehensive guide, we will take an in-depth look at ReactJS, its features, and how to get started with building web applications using ReactJS.

Chapter 1: Getting Started with ReactJS In this chapter, we will go over the basics of ReactJS, including its history, features, and how it works. We will also go over the tools and technologies you need to get started with ReactJS.

Chapter 2: Setting up Your Environment Before you can start building web applications with ReactJS, you need to set up your development environment. In this chapter, we will walk you through the process of setting up your environment, including installing Node.js, npm, and other tools you need.

Chapter 3: Building Your First ReactJS Application In this chapter, we will show you how to build your first ReactJS application. We will go over the basics of ReactJS components, JSX, and how to use them to build a simple web application.

Chapter 4: Understanding Components Components are the building blocks of ReactJS applications. In this chapter, we will take an in-depth look at components, how to create them, and how to use them in your applications.

Chapter 5: Managing State and Props In this chapter, we will explore state and props, two key concepts in ReactJS. We will show you how to use state and props to manage data and pass it between components.

Chapter 6: Working with Forms and Events Forms and events are essential elements of web applications. In this chapter, we will show you how to work with forms and events in ReactJS. We will go over how to handle form input and user events using ReactJS.

Chapter 7: Working with APIs APIs are used to connect web applications to external services and data sources. In this chapter, we will show you how to work with APIs in ReactJS. We will go over how to fetch data from APIs and use it in your applications.

Chapter 8: Testing Your ReactJS Application Testing is an essential part of software development. In this chapter, we will show you how to test your ReactJS application using popular testing frameworks like Jest and Enzyme.

Chapter 9: Optimizing Your ReactJS Application Performance is crucial in web applications. In this chapter, we will show you how to optimize your ReactJS application for performance. We will go over techniques like code splitting, lazy loading, and server-side rendering.

Chapter 10: Deploying Your ReactJS Application Once you have built your ReactJS application, you need to deploy it to a web server. In this chapter, we will show you how to deploy your ReactJS application to popular web hostings services like AWS, Google Cloud, and Heroku.

Chapter 11: Advanced ReactJS Concepts In this chapter, we will explore some of the advanced concepts in ReactJS. We will go over topics like Higher Order Components, Render Props, and Context API.

React JS is a flexible open-source JavaScript library for implement the user Interface or we can say View of MVC

React JS is maintained by Facebook so it a reliable. And react js is component-based which make the code in small waves of peace and import in particular component and make a single page application.



Let’s consider the above image where we can see the Header, Menus, and Content. So basically this three-part we can divide and put in different components like in the header component we can write the code for the header only. and the same as other parts, so that way we can make the component in different waves of peace of code and import in the parent component. So it will display as one page and that would be reusable and you can use it wherever you need in the current project.

Let’s see with the code structure of ReactJS


  <h1>Hello, world!</h1>,

In ReactJS there are two types of Component

  1. Functional Component
  2. Class Component
1. Functional Component

I hope You have created functions before in JavaScript. so the functional component is basically the same as the JavaScript function where we can get the props as a parameter and render in return function for display in UI.

import React from 'react';
const Test = (props) => {
&nbsp; &nbsp;return (
&nbsp; &nbsp; &nbsp; <div>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;<p>Title</p>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;{props.title}
&nbsp; &nbsp; &nbsp; </div>
&nbsp; &nbsp;);
export default Test;
2. Class Component

It’s totally different from than functional component, In-class component needs to define a class that extends Component and has a render function. we can use the life-cycles methods in-class components whereas in functional components we can use react Hooks.

// MyComponent.js
import React, { Component } from 'react';

class MyComponent extends Component {
  render() {
    return (
      <div>This is my component.</div>

export default MyComponent;

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