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// #docregion Observable
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import {Observable, Subscriber} from 'rxjs/Rx';
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var obs = new Observable<number>((obs: Subscriber<number>) => {
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var i = 0;
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setInterval(() => { obs.next(++i); }, 1000);
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});
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obs.subscribe(i => console.log(`${i} seconds elapsed`));
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// #enddocregion
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