Start learning ReactJS from the beginning | Join our live introductory class (Class 1)

Introduction:
ReactJS is a popular JavaScript library that is used for building interactive user interfaces. It is maintained by Facebook and a community of developers. In this tutorial, we will learn ReactJS from scratch through a live basics class. This class will cover the fundamentals of ReactJS and provide a hands-on experience of building a simple React application.

Class 1 Agenda:

• Introduction to ReactJS
• Setting up the development environment
• Creating a basic React component
• Rendering the component in the browser

Getting Started:
Before we dive into the live class, let’s make sure we have all the necessary tools and resources set up. To work with ReactJS, you will need to have Node.js installed on your machine. You can download and install Node.js from the official website (https://nodejs.org/).

Once Node.js is installed, open up your terminal and run the following command to install create-react-app, which is a tool that helps you set up a new React project easily:

npm install -g create-react-app

After installing create-react-app, you can create a new React project by running the following command:

create-react-app my-react-app
cd my-react-app
npm start

This will create a new React project called "my-react-app" and start a development server. You can open your web browser and navigate to http://localhost:3000 to see your React application running.

Creating a Basic React Component:
In React, everything is a component. Components are reusable building blocks that represent parts of a user interface. Let’s create a basic React component called "HelloWorld" that will display a simple greeting message.

Open up your code editor and navigate to the "src" directory in your React project. Create a new file called "HelloWorld.js" and add the following code:

import React from 'react';

class HelloWorld extends React.Component {
  render() {
    return <div>Hello, World!</div>;
  }
}

export default HelloWorld;

In this code, we have defined a class component called "HelloWorld" that extends the React.Component class. The render method returns a div element with the text "Hello, World!". We then export the component using the export default syntax.

Rendering the Component:
Now that we have created our HelloWorld component, let’s render it in our main App component. Open up the "App.js" file in the "src" directory and update it as follows:

import React from 'react';
import HelloWorld from './HelloWorld';

class App extends React.Component {
  render() {
    return (
      <div>
        <h1>My React App</h1>
        <HelloWorld />
      </div>
    )
  }
}

export default App;

In this code, we have imported the HelloWorld component at the top of the file and added it inside the render method of the App component. Now when you save the file and refresh your browser, you should see the greeting message "Hello, World!" displayed on the screen.

Conclusion:
In this live basics class, we have covered the fundamentals of ReactJS and built a simple React application. We have learned how to create a basic React component, render it in the browser, and set up a development environment for React development. This is just the beginning of your journey with ReactJS, and there is a lot more to explore and learn. I encourage you to continue practicing and building more complex applications with ReactJS to further enhance your skills. Thank you for attending this class, and happy coding!