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<head>
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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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const source = Rx.Observable.of(1,2,3,4,5);
//transparently log values from source with do
const example = source
  .do(val => console.log(`BEFORE MAP: ${val}`))
  .map(val => val + 10)
  .do(val => console.log(`AFTER MAP: ${val}`));
//do does not transform values
//output: 11...12...13...14...15
const subscribe = example.subscribe(val => console.log(val));
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