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  <title>RxJS Operators</title>
  <script src="https://npmcdn.com/@reactivex/rxjs@5.0.0-beta.2/dist/global/Rx.umd.js"></script>
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<body>
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//emit 'Hello' and 'Goodbye'
const source = Rx.Observable.of('Hello', 'Goodbye');
// map value from source into inner observable, when complete emit result and move to next
const exampleOne = source.concatMap(val => Rx.Observable.of(`${val} World!`));
//output: 'Example One: 'Hello World', Example One: 'Goodbye World'
const subscribe = exampleOne
  .subscribe(val => console.log('Example One:', val));
//example with promise
const examplePromise = val => new Promise(resolve => resolve(`${val} World!`));
// map value from source into inner observable, when complete emit result and move to next
const exampleTwo = source.concatMap(val => examplePromise(val))
//output: 'Example w/ Promise: 'Hello World', Example w/ Promise: 'Goodbye World'
const subscribeTwo = exampleTwo
  //delay for logging clarity
  .delay(1000)
  .subscribe(val => console.log('Example w/ Promise:', val));
//result of first param passed to second param selector function before being  returned
const exampleWithSelector = source.concatMap(val => examplePromise(val), result => `${result} w/ selector!`);
//output: 'Example w/ Selector: 'Hello w/ Selector', Example w/ Selector: 'Goodbye w/ Selector'
const subscribeThree = exampleWithSelector
  //delay for logging clarity
  .delay(2000)
  .subscribe(val => console.log('Example w/ Selector:', val));
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