title: Copying from an Observable to an Observer
body: <p>I would like to copy the contents of an <code>Observable</code> into an <code>Observer</code>.</p>
  
  <p>Is there a succinct way of achieving this without resorting to <code>subscribe()</code> and manually pumping events from the <code>Observable</code> to the <code>Observer</code>? i.e.</p>
  
  <pre><code>    var observer = new Subject();
      var observable = new Subject();
  
      observable.subscribe(i =&gt; observer.next(i), e =&gt; observer.error(e), () =&gt; observer.complete())
  </code></pre>
  
  <p>NOTE: Above code example is in TypeScript.</p>