React JS - Class component - Ajax call wihtout Axios or Fetch : rxjs/ajax & map - rxjs/Operators

import React, { Component } from "react";

import ReactDOM from "react-dom";

import { ajax } from 'rxjs/ajax';

import { map } from 'rxjs/operators';

class App extends Component {

   constructor() {

      super();

      this.state = { data: [] };

   }

   componentDidMount() {

      const response = ajax('https://jsonplaceholder.typicode.com/users').pipe(map(e => e.response));

      response.subscribe(res => {

         this.setState({ data: res });

      });

   }

   render() {

      return (

         <div>

            <h3>Using RxJS with ReactJS</h3>

            <ul>

               {this.state.data.map(el => (

                  <li>

                     {el.id}: {el.name}

                  </li>

               ))}

            </ul>

         </div>

      );

   }

}

ReactDOM.render(<App />, document.getElementById("root"));