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  <title>RxJS 5 Operators</title>
  <script src="https://npmcdn.com/@reactivex/rxjs@5.0.0-beta.3/dist/global/Rx.umd.js"></script>
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const empty = Rx.Observable.of();
//emit 'Observable.of() Empty!' when empty, else any values from source
const exampleOne = empty.defaultIfEmpty('Observable.of() Empty!');
//output: 'Observable.of() Empty!'
const subscribe = exampleOne.subscribe(val => console.log(val));
//empty observable
const emptyTwo = Rx.Observable.empty();
//emit 'Observable.empty()!' when empty, else any values from source
const exampleTwo = emptyTwo.defaultIfEmpty('Observable.empty()!');
//output: 'Observable.empty()!'
const subscribe = exampleTwo.subscribe(val => console.log(val));
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