1class Foo extends Component {
2  constructor(props) {
3    super(props);
4    this.handleClick = this.handleClick.bind(this);
5  }
6  handleClick() {
7    console.log('Click happened');
8  }
9  render() {
10    return <button onClick={this.handleClick}>Click Me</button>;
11  }
12}

1export default class Archive extends React.Component { 
2
3    saySomething(something) {
4        console.log(something);
5    }
6
7    handleClick(e) {
8        this.saySomething("element clicked");
9    }
10
11    componentDidMount() {
12        this.saySomething("component did mount");
13    }
14
15    render() {
16        return <button onClick={this.handleClick.bind(this)} value="Click me" />;
17    }
18}