title: Failable map in RxJS?
body: <p>I'm from iOS land where I've used <a href="https://github.com/ReactiveCocoa/ReactiveCocoa" rel="nofollow">ReactiveCocoa</a> extensively. In RAC, there is <code>tryMap</code> operator which <code>sendError</code> when the <code>map</code>ing operation fails.</p>
  
  <p>Is there an equivalent in Rx.JS? I can mimic the similar behavior using <code>flatMap</code> and another <code>Observable</code> but that certainly seems like an overkill.</p>
  
  <p>Thanks!</p>