class ButtonComponent extends React.Component {
  constructor(props) {
    super(props)
    this.state = {
      message: 'I do not need to be manually binded!',
    }
  }

  // this is now defined using the arrow function syntax
  handleClick = () => {
    console.log(this.state.message)
  }

  render() {
    return
      < button onClick={this.handleClick} />
  }
}