how to use tap() code example

Example: how to use tap()

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      import { fromEvent } from 'rxjs';
import { tap, map } from 'rxjs/operators';

const clicks = fromEvent(document, 'click');
const positions = clicks.pipe(
  tap(ev => console.log(ev)),
  map(ev => ev.clientX),
);
positions.subscribe(x => console.log(x));