title: How to map array form observable to another array
body: <p>I am currently using <code>this.route.url.subscribe(params=&gt;...</code> to do something with my route parameters. I want to check if some parameters are in the subscribed param array. But this array contains <code>URLSegments</code> from which I only want to check for the <code>path</code> attribute. Is there any way I can remap this with a <code>map</code> operator?<br>
  I tried remapping the whole array like <code>this.route.url.map(x=&gt;x.path)</code> but that does not work because the array itself has no <code>path</code>. Am I missing something?</p>