class component

 The sample react app always create function component which is stateless and used a lot now a days.

Let's see how the earlier component types, Class component is created.

So, instead of function, a class is created and render() function is used to return the output.

The class extends from React.Component.

import React from "react";
import "./App.css";

class App extends React.Component {
  render() {
    return (
      <div className="App">
        <h1>Hello from React</h1>
      </div>
    );
  }
}

export default App;

You can import the Component sub class also and change the code as below.

import React, { Component } from "react";
import "./App.css";

class App extends Component {
  render() {
    return (
      <div className="App">
        <h1>Hello from React</h1>
      </div>
    );
  }
}

export default App;