when components, which are reusable, self-contained chunks of code that encapsulate logic, data, and presentation, are used. To create more sophisticated UI structures, components can be nested by putting one inside another.
Let’s utilize React, one of the most well-liked JavaScript libraries for developing user interfaces, as an illustration for constructing and nesting components.
First Step: Configuring the React Environment
Installing Node.js and npm (Node Package Manager) is required before you can begin using React. By executing the following commands, a new React project may be created:
npx create-react-app my-app
cd my-app
npm start
Create Components in Step 2
JavaScript functions or classes are used to generate components in React. We’ll make two straightforward functional components for this example.
Add the following code to a fresh file called Header.js in the src folder:
// Header.js
import React from ‘react’;
function Header() {
return (
<header>
<h1>Welcome to My App</h1>
</header>
);
}
export default Header;
In the src folder, make a new file called Content.js and add the following code:
// Content.js
import React from ‘react’;
function Content() {
return (
<section>
<p>This is the content of the app.</p>
</section>
);
}
export default Content;
Nesting Components in Step 3
Let’s now develop a parent component that will contain the Header and Content components that we previously established.
Edit the App.js file in the src folder and add the code below to its content:
// App.js
import React from ‘react’;
import Header from ‘./Header’;
import Content from ‘./Content’;
function App() {
return (
<div>
<Header />
<Content />
</div>
);
}
export default App;
4. Render the application.
In the index.js file, you must render the App component to complete the process.
// index.js
import React from ‘react’;
import ReactDOM from ‘react-dom’;
import App from ‘./App’;
import ‘./index.css’;
ReactDOM.render(
<React.StrictMode>
<App />
</React.StrictMode>,
document.getElementById(‘root’)
);
I’m done now! In React, you have constructed and nested components. The Header and Content components should be rendered inside the App component on the browser when you start the development server using npm start.
Keep in mind that this example shows the fundamental React notion of building and nesting components. Components can be further grouped and reused to create scalable and maintainable user interfaces in increasingly sophisticated systems.
