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<!DOCTYPE html>
<html>
<head>
<script src="//code.jquery.com/jquery-2.1.0.min.js"></script>
  <title>JS Bin</title>
  <script src="//cdn.jsdelivr.net/rsvp/3.0.6/rsvp.js"></script>
  <script src="//cdnjs.cloudflare.com/ajax/libs/rxjs/2.3.12/rx.min.js"></script>
</head>
<body>
  <input id="input" type="text">
</body>
</html>
 
var source = Rx.Observable.throw(new Error())
  .doOnError(
    function (err) { console.log('Do Error: ' + err); }
  );
​
var subscription = source.subscribe(
  function (x) {
    console.log('Next: ' + x);
  },
  function (err) {
    console.log('Error: ' + err);
  },
  function () {
    console.log('Completed');
  });
​
// => Do Error: Error
// => Error: Error
Output

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