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  <title>RxJS 5 Operators</title>
  <script src="https://npmcdn.com/@reactivex/rxjs@5.0.0-beta.5/dist/global/Rx.umd.js"></script>
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<body>
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//emit 2
const source = Rx.Observable.of(2);
const example = source
  //recursively call supplied function
  .expand(val => {
       //2,3,4,5,6
       console.log(`Passed value: ${val}`);
       return Rx.Observable.of(1 + val);
    })
    //call 5 times
    .take(5);
//output: 2,3,4,5,6
const subscribe = example.subscribe(val => console.log(`RESULT: ${val}`));
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