var JSON_URL = "https://api.example.io/comments.json";
class CommentList extends React.Component {
    constructor() {
        super();
        this.state = { comments: [] }
    }
    componentDidMount() {
        $.ajax({
            url: JSON_URL,
            dataType: 'json',
            success: function(data) {
                   this.setState({comments: data.comments});
            }.bind(this)
         });
    };
    render() {
          return <ul> {this.state.comments.map((comment) => {
               return <li>{comment.body}—{comment.author}</li>;
                })}           </ul>;  }
    }
    React.render(<CommentList />, document.getElementById('root'));