// like_button.js'use strict';const e = React.createElement;class LikeButton extends React.Component {
  constructor(props) {
    super(props);
    this.state = { liked: false };
  }
  render() {
    if (this.state.liked) {
      return 'You liked this.';
    }
    return (
    /* JSX code following… */
      <button onClick={() => this.setState({ liked: true })}>
          Like
      </button>
    );
  }}const domContainer = document.querySelector('#like_button_container');ReactDOM.render(e(LikeButton), domContainer);