class NumbersGame extends React.Component<any, INumbersGameState>{

  public constructor(props: any) {
    super(props);
    this.onDragEnd = this.onDragEnd.bind(this);
    this.state = {...initialData};
  }

  public onDragEnd(result: any) {
    // the item was dropped!
  }

  public render() {
    const numbers = this.state.column.numberIds.map((numberId: string) => this.state.numbers[numberId]);

    return (
      <NumbersGameContext onDragEnd={this.onDragEnd}>
        <VerticalColumn column={this.state.column} items={numbers} />
      </NumbersGameContext>
    )
  }
}