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  <script src="https://cdnjs.cloudflare.com/ajax/libs/rxjs/5.0.1/Rx.js"></script>
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var subject = new Rx.Subject();
var observer = {
    next: x => console.log('next: ' + x),
    error: err => console.log('error: ' + err),
    complete: () => console.log('complete')
}
subject.subscribe(observer);
subject.next(1);
// next: 1
subject.next(2);
// next: 2
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