import React, { Component } from 'react';
import PropTypes from 'prop-types';

class Foo extends Component {

  static displayName = 'Foo';
  static propTypes = { bar: PropTypes.string };
  static defaultProps = { bar: 'Bar' };

  state = { saludo: 'Hola' };

  render() {
    return this.state.saludo + this.props.bar;
  }
}