text: import React from 'react';
  import { render } from 'react-dom';
  
  import MyUser from './MyUser';
  
  // Performs the initial rendering of "<MyUser>".
  const myUser = render(
    (<MyUser />),
    document.getElementById('app')
  );
  
  // Sets the state, with a new "modified" value.
  // Since the modified state has changed, the
  // component will re-render.
  myUser.setState({
    modified: new Date(),
    first: 'First1',
    last: 'Last1',
  });
  
  // The "first" and "last" states have changed,
  // but the "modified" state has not. This means
  // that the "First2" and "Last2" values will
  // not be rendered.
  myUser.setState({
    first: 'First2',
    last: 'Last2',
  });
  