title: When to use asObservable() in rxjs?
body: <p>I am wondering what is the use of <a href="https://github.com/Reactive-Extensions/RxJS/blob/master/doc/api/core/operators/asobservable.md" rel="noreferrer"><code>asObservable</code></a>:</p>
  
  <p>As per docs: </p>
  
  <blockquote>
    <p>An observable sequence that hides the identity of the
    source sequence.</p>
  </blockquote>
  
  <p>But why would you need to hide the sequence?</p>