import { map, tap, catchError, switchMap, filter } from 'rxjs/operators';

source()

.pipe(

map(x => x + 'foo'),

map(x => x + 'bar'),

catchError(err => {})

)

.subscribe(data => {

sink(data)

});

source()

.pipe(

map(x => x + 'foo'),

// `tap` taps into the source observable, so like `subscribe` but inside the pipe.

tap(x => sink(x)),

tap(x => sink(x)),

catchError(err => {})

)

.subscribe(data => {

sink(data)

});

myIdentifier()

.pipe(

switchMap(x => source(x)),

filter(x => myFilter(x)),

tap(x => sink(x)),

catchError(err => {}),

map(x => x + 'foo')

)

.subscribe(data => {

sink(data)

});