03_es6

class AppES6 extends React.Component{
  constructor(){
    super();
    this.state = {foo: 1};
    this.handleChange = this.handleChange.bind(this);
  }
  handleChange(e) {
    this.setState({foo: e.target.value});
  }
  render() {
    return(
      <input type="text" onChange={this.handleChange}/>
      {this.state.foo}
    );
  }
};