import { Subject } from 'rxjs/Subject';
import { BehaviorSubject } from 'rxjs/BehaviorSubject';
import { Observable } from 'rxjs/Observable';
import { of } from 'rxjs/observable/of;'

import 'rxjs/add/observable/of';	
import 'rxjs/add/operator/catch';	
import 'rxjs/add/operator/do';	
import 'rxjs/add/operator/map';	
import 'rxjs/add/operator/mergeMap';	
import 'rxjs/add/operator/switchMap';

import 'rxjs/add/observable/of';	
import 'rxjs/add/operator/catch';	
import 'rxjs/add/operator/do';	
import 'rxjs/add/operator/map';	
import 'rxjs/add/operator/mergeMap';	
import 'rxjs/add/operator/switchMap';

import { of } from 'rxjs';
import { map, switchMap, catchError, mergeMap } from 'rxjs/operators';

do -> tap
catch -> catchError
switch -> switchAll
finally -> finalize

this.http.get('url')
  .do(console.log)
  .map(results => results.data)
  .subscribe(results => {
    console.log('Resultados', results);
  });

this.http.get('url')
  .pipe(
    tap(console.log), // antigo operador 'do'
    map(results => results.data)
  )
  .subscribe(results => {
    console.log('Resultados', results);
  });