Skip to content
Related Articles

Related Articles

ReactJS isCompositeComponentWithType() Method

View Discussion
Improve Article
Save Article
  • Last Updated : 01 Jun, 2021

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 isCompositeComponentWithType() method. This method returns true if a component whose type is of a React componentClass.

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.


import React from 'react';
import { isCompositeComponentWithType } from 'react-dom/test-utils';
// Defining our App Component
const App = () => {
  // Function to demonstrate isCompositeComponentWithType() method
  function func() {
    var a = isCompositeComponentWithType(el);
    console.log("The Following element is"+
                " isCompositeComponentWithType :", a);
  const el = <div>
  // Returning our JSX code
  return <>
      <div id='el'>
          <button onClick={func}>
           Click Here !!
// 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:


My Personal Notes arrow_drop_up
Recommended Articles
Page :

Start Your Coding Journey Now!