React.js library is all about splitting the app into several components. Each Component has its own lifecycle. React provides us some in-built methods that we can override at particular stages in the life-cycle of the component.
In this article, we will know how to use isDOMComponent() method. This method returns true if the instance is a DOM component.
Creating React Application And Installing Module:
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Step 1: Create a React application using the following command.
npx create-react-app foldername
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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 { isDOMComponent } from 'react-dom/test-utils';   // Defining our App Component const App = () => {     // Function to demonstrate isDOMcomponent() method   function func() {     var a = isDOMComponent(el);     console.log("The Following element is a DOM component :", a);   }     const el = <div>       <h1>element</h1>   </div>     // Returning our JSX code   return <>       <div id='el'>           <h1>neveropen</h1>           <button onClick={func}>Click Here !!</button>       </div>   </>; }   // Exporting your Default App Component export default App |
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://reactjs.org/docs/test-utils.html#isdomcomponent
