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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>bufferCount</title>
  <script src="https://npmcdn.com/@reactivex/rxjs@5.0.0-beta.3/dist/global/Rx.umd.js"></script>
</head>
<body>
</body>
</html>
 
//emit value every second
const sourceInterval = Rx.Observable.interval(1000);
//start first buffer after 5s, and every 5s after
const startInterval = Rx.Observable.interval(5000);
//emit value after 3s, closing corresponding buffer
const closingInterval = val => {
    console.log(`Value ${val} emitted, starting buffer! Closing in 3s!`)
    return Rx.Observable.interval(3000);
}
//every 5s a new buffer will start, collecting emitted values for 3s then emitting buffered values
const bufferToggleInterval = sourceInterval.bufferToggle(startInterval, closingInterval);
//log to console
//ex. emitted buffers [4,5,6]...[9,10,11]
const subscribe = bufferToggleInterval.subscribe(val => console.log('Emitted Buffer:', val));
Output

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