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<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>RxJS 5 Operators</title>
  <script src="https://npmcdn.com/@reactivex/rxjs@5.0.0-beta.3/dist/global/Rx.umd.js"></script>
</head>
<body></body>
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//emit value every 1 second
const source = Rx.Observable.interval(1000);
const example = source
  //side effects will be executed once
  .do(() => console.log('Do Something!'))
  //do nothing until connect() is called
  .publish();
/*
  source will not emit values until connect() is called
  output: (after 5s) 
  "Do Something!"
  "Subscriber One: 0"
  "Subscriber Two: 0"
  "Do Something!"
  "Subscriber One: 1"
  "Subscriber Two: 1"
*/
const subscribe = example.subscribe(val => console.log(`Subscriber One: ${val}`));
const subscribeTwo = example.subscribe(val => console.log(`Subscriber Two: ${val}`));
//call connect after 5 seconds, causing source to begin emitting items
setTimeout(() => {
 example.connect(); 
},5000)
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