Greetings, web warrior!

As we journey through the vast digital landscape, the terrain shifts under our feet. While JavaScript is the bedrock of web interactivity, frontend frameworks like React, Vue, and Angular have risen as towering mountains, reshaping the horizon of web development.

Today, we set our sights on React.js—a declarative, efficient, and flexible JavaScript library for building user interfaces.

Understanding React.js

React promotes the creation of reusable UI components. These components dictate what you see and how you interact on the screen.

JSX: An XML-like syntax extension for JavaScript. It isn’t necessary to use JSX in React, but it’s recommended due to its readability and conciseness.

const element =

Hello, world!

;

Components: React is all about components. A React application is essentially a component tree.

class Welcome extends React.Component {
render() {
return

# Hello, {this.props.name}

;
}
}

State & Props: React components have a built-in state object. When the state object changes, the component re-renders. Props are parameters passed to components.

Exercise

Forge your own React masterpiece:

• Set up a new React app using Create React App.
• Create a basic React component that displays a greeting based on a name prop.

Hints for the exercise:

• If you haven’t already set up React, you can do so using Create React App.
• Create a new component in a separate file, say Greeting.js.
• Use the component in your App.js and pass in different names to see the greetings change.

Here’s a simple scaffold to start with:

Greeting.js

import React from 'react';
function Greeting(props) {
return

# Hello, {props.name}!

;
}
export default Greeting;

App.js

import React from 'react';
import './App.css';
import Greeting from './Greeting';
function App() {
return (

);
}
export default App;

Conclusion

Brilliant job, developer extraordinaire! React offers a powerful toolkit for crafting interactive and efficient web applications. Today, you’ve taken your first steps in the React realm. As you delve deeper, you’ll discover hooks, context, Redux, and more. The React journey is long but rewarding. Embrace the components, and keep building! Safe coding!