I dont get rxjs 6 with angular 6 with interval, switchMap, and map : <p>I want to update my rxjs code to 6 got I don't get it.</p>

<p>Before I had the below that wouth poll for new data every 5 seconds:</p>

<pre><code>import { Observable, interval } from 'rxjs';
import { switchMap, map } from 'rxjs/operators';

var result = interval(5000).switchMap(() =&gt; this._authHttp.get(url)).map(res =&gt; res.json().results);
</code></pre>

<p>Now...of course, it's broken and the documentation leaves me nowhere to go.</p>

<p>How do I write the above to conform to rxjs 6?</p>

<p>Thanks</p>
