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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>
 
/* Have staggering intervals */
var source1 = Rx.Observable.interval(100)
    .map(function (i) { return 'First: ' + i; });
​
var source2 = Rx.Observable.interval(150)
    .map(function (i) { return 'Second: ' + i; });
​
// Combine latest of source1 and source2 whenever either gives a value
var source = source1.combineLatest(
    source2,
    function (s1, s2) { return s1 + ', ' + s2; }
    ).take(4);
​
var subscription = source.subscribe(
    function (x) {
        console.log('Next: ' + x.toString());
    },
    function (err) {
        console.log('Error: ' + err);   
    },
    function () {
        console.log('Completed');   
    });
​
// => Next: First: 0, Second: 0 
// => Next: First: 1, Second: 0 
// => Next: First: 1, Second: 1 
// => Next: First: 2, Second: 1 
// => Completed
Output

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