How to use arrow functions inside React.createClass

Question

I want to use ES6 (ES2015) as much as possible for my small project. Now I want to use arrow functions with React.

// What I want
let Text = React.createClass({
    componentDidMount: () => {
        setInterval(this.updateCurrentTime, 1000);
    }
}

// What I have
let Paragraph = React.createClass({
    render: () => (<div className="MySuperTable"><Text name="Dodo" startDate={(new Date()).toString()} /></div>)
});

let Text = React.createClass({
    getInitialState: function () {
        return {
            currentTime: (new Date()).toString()
        }
    },
    componentDidMount: function () {
        setInterval(this.updateCurrentTime, 1000);
    },
    updateCurrentTime: function () {
        this.setState({
            currentTime: (new Date()).toString()
        });
    },
    render: function () {
        return (
            <div>
                <span>Hello my name is {this.props.name}</span>
                <span>And I was born on {this.props.startDate}</span>
                <span>And I now it's {this.state.currentTime}</span>
            </div>
        );
    }
});

ReactDOM.render(
    <Paragraph/>,
    document.getElementById('container')
);

1. What do I have to do to get this working?
2. As I understand this will be the object passed into createClass itself, is this correct?
3. How do I bind it to the Text instance?

Thanks in advance.

Answer 1

You can change your code with ES2015 like this

class Text extends React.Component {
  constructor() {
    super();
    this.state = { currentTime: (new Date()).toString() };
  }

  componentDidMount() {
    setInterval(() => this.updateCurrentTime(), 1000);
  }

  updateCurrentTime() {
    this.setState({
      currentTime: (new Date()).toString()
    });
  }

  render() {
    return <div>
      <span>Hello my name is { this.props.name }</span>
      <span>And i was born { this.props.startDate }</span>
      <span>And i now it's { this.state.currentTime }</span>
    </div>  
  }
};

let Paragraph = () => {
  return <div className="MySuperTable">
    <Text name="Dodo" startDate={ (new Date()).toString() } />
  </div>
};

Example

React - Reusable Components