Function constructor

src/Tree/Tree.js:22–32

(props)

class Tree extends Component {
  constructor (props) {
    super(props);

    this.state = {
      data: [],
      value: this.formatValue(props.value)
    };

    this.onClick = this.onClick.bind(this);
    this.handleChange = this.handleChange.bind(this);
  }
  
  componentWillMount () {
    this.formatData(this.props.data);