React.js library is all about splitting the app into several components. Each Component has its own lifecycle. React provides us with some in-built methods that we can override at particular stages in the life-cycle of the component.
In class-based components, the unmountComponentAtNode() method Remove a mounted React component from the DOM.
Creating React Application:
- Step 1: Create a React application using the following command.
npx create-react-app foldername
- Step 2: After creating your project folder i.e. foldername, move to it using the following command.
cd foldername
Project Structure: It will look like the following.
Example: Now write down the following code in the App.js file. Here, App is our default component where we have written our code.
App.js
import React from 'react'import ReactDOM from 'react-dom';Â
// Exporting your App Componentexport default function App() {Â
  // Function to unmount root component  function unm() {    ReactDOM.unmountComponentAtNode(document.getElementById("root"));  }Â
  return (    <div>      <h1>neveropen</h1>      <div>Hi Geek, this is the rendered content</div>      <button onClick={unm}>Unmount</button>    </div>  );} |
Step to Run Application: Run the application using the following command from the root directory of the project:
npm start
Output: Now open your browser and go to http://localhost:3000/, you will see the following output:
Reference: https://react.dev/reference/react-dom/unmountComponentAtNode
