beginners-guide-react-router-15.js

import {
  Route,
  Link,
  Switch
} from 'react-router-dom';

const Messages = ({ match }) => (
  <div>
    <ul>
     ...
    </ul>
    <Switch>
      <Route path={`${match.url}/:id(\\d+)`} component={Message} />
      <Route
        path={match.url}
        render={() => <h3>Please select a message</h3>}
      />
    </Switch>
  </div>
);