title: RXJS - Angular : Two Observable<booleans> should return Observable<boolean>
body: <p>I want to evaluate two <code>observable&lt;boolean&gt;</code> and I would like to save the flow in another <code>observable&lt;boolean&gt;</code>.</p>
  
  <p>I tried <code>combineLatest(obs1$, obs2$);</code> but it generates an <code>observable&lt;[boolean, boolean]&gt;</code>. </p>
  
  <p>Is there a better function than <code>combineLatest</code> to evaluate both observables and returns another <code>observable&lt;boolean&gt;</code>?</p>