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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>
 
/* With a seed */
var source = Rx.Observable.range(1, 3)
    .scan(
        1,
        function (acc, x) {
            return acc * x;
        });
var subscription = source.subscribe(
    function (x) {
        console.log('Next: ' + x);
    },
    function (err) {
        console.log('Error: ' + err);   
    },
    function () {
        console.log('Completed');   
    });
// => Next: 1
// => Next: 2
// => Next: 6
// => Completed 
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