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Use of super() method inside constructor of the component

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The super() is used inside the constructor for the purpose of getting access to this keyword inside our constructor. Super is a keyword in JavaScript and is used to call super or parent class in the hierarchy. React class extends React Component with ES6 syntax. If we would like to set a property or access this inside the constructor we need to call the super() method. 

Prerequisites:

Steps to create React Application:

Step 1: Create a React application using the following command:

npx create-react-app filename

Step 2: After creating your project folder i.e. example, move to it using the following command:

cd filename

Project Structure:

Project Structure

The updated dependencies in package.json file will look like:

"dependencies": {
"react": "^18.2.0",
"react-dom": "^18.2.0",
"react-scripts": "5.0.1",
"web-vitals": "^2.1.4",
}

Example 1: This example will illustrate the use of super() inside the constructor of the component

Javascript




import React from 'react'
 
class MyComponent extends React.Component {
    constructor() {
        // Undefined
        console.log(this)
    }
    render() {
        // Defined
        return <div>Super Concept</div>;
    }
}
 
export default MyComponent;


Step to Run Application: Run the application using the following command from the root directory of the project:

npm start

Output:

Example 2: This example illustrates the code by solving that error we use super() in the constructor.

Javascript




// App.js
 
import React from 'react'
 
class MyComponent extends React.Component {
constructor() {
    super()
    console.log(this)
}
 
render() {
    return <div>Super Concept</div>; // Defined
}
}
 
export default MyComponent;


Output:

SuperOutput

Output



Last Updated : 04 Dec, 2023
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