// 1. Bind handleIncrementClick and handleDecrementClick to their app corresponding buttons

// 2. Implement handleIncrementClick using setState

// 3. Implement handleDecrementClick using setState

​

var NumberSelector = React.createClass({

  getInitialState () {

    return { number: 0 };

  },

  handleIncrementClick () {

    // code for 2

  },

  handleDecrementClick () {

    // code for 3

  },

  render () {

    return <div style={{width: 70, textAlign: "center"}}>

      <h2>{this.state.number}</h2>

      <button /* code for 1 */>-</button>

      <button /* code for 1 */}>+</button>

    </div>;

  }

});

​

React.render(<NumberSelector />, document.body);