<div id='app'></div>

class Users extends React.Component {
  render() {
    return (
      <ul>
        {
          
          this.props.list.map(function(user) {
            return <li>{user}</li>
          })
        }
      </ul>
    )
  }
}

ReactDOM.render(
  <Users list={['Tyler', 'Mikenzi', 'Ryan', 'Michael']} />,
  document.getElementById('app')
);