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<!DOCTYPE html>
<html>
<head>
  <title>JS Bin</title>
  <script src="//cdn.jsdelivr.net/rsvp/3.0.6/rsvp.js"></script>
  <script src="//cdnjs.cloudflare.com/ajax/libs/rxjs/2.2.28/rx.all.min.js"></script>
</head>
<body>
</body>
</html>
 
/* Using Promises and Observables */
var source = Rx.Observable.amb(
    RSVP.Promise.resolve('foo'),
    Rx.Observable.timer(200).select(() => 'bar')
);
​
var subscription = source.subscribe(
  x => console.log(`onNext: ${x}`),
  e => console.log(`onError: ${e}`),
  () => console.log('onCompleted'));
​
// => onNext: foo
// => onCompleted
Output

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