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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/2.2.28/rx.all.min.js"></script>
</head>
<body>
  <input id="input" type="text">
</body>
</html>
 
var interval = Rx.Observable.interval(1000);
​
var source = interval
    .take(2)
    .doAction(function (x) { 
        console.log('Side effect');
    });
 
var published = source.shareValue(42);
 
published.subscribe(createObserver('SourceA'));
published.subscribe(createObserver('SourceB'));
​
function createObserver(tag) {
    return Rx.Observer.create(
        function (x) {
            console.log('Next: ' + tag + x);
        },
        function (err) {
            console.log('Error: ' + err);   
        },
        function () {
            console.log('Completed');   
        });
}
​
// => Next: SourceA42 
// => Next: SourceB42 
// => Side effect
// => Next: SourceA0 
// => Next: SourceB0 
// => Side effect
// => Next: SourceA1 
// => Next: SourceB1 
// => Completed 
// => Completed
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