ReactJS isCompositeComponent() Method

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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 see how to use isCompositeComponent() method. The isCompositeComponent() method return true if instance is a user-defined component.

Creating React Application And Installing Module:

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 { isCompositeComponent } from 'react-dom/test-utils'; 
  
// Defining our App Component 
const App = () => { 
  
// Function to demonstrate isCompositeComponent() method 
function func(){ 
   var a = isCompositeComponent(el); 
   console.log("The Following is an element :", a); 
} 
  
const el = <div> 
    <h1>element</h1> 
</div> 
  
// Returning our JSX code 
return <> 
    <div> 
        <h1>zambiatek</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#iscompositecomponent

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