Return an empty Observable

Question

The function more() is supposed to return an Observable from a get request

export class Collection{

    public more = (): Observab         


        

Answer 1

Try this

export class Collection{
public more (): Observable<Response> {
   if (this.hasMore()) {
     return this.fetch();
   }
   else{
     return this.returnEmpty(); 
   }            
  }
public returnEmpty(): any {
    let subscription = source.subscribe(
      function (x) {
       console.log('Next: %s', x);
    },
    function (err) {
       console.log('Error: %s', err);
    },
    function () {
       console.log('Completed');
    });
    }
  }
let source = Observable.empty();

Answer 2

You can return Observable.of(empty_variable), for example

Observable.of('');

// or
Observable.of({});

// etc

Answer 3

For typescript you can specify generic param of your empty observable like this:

import 'rxjs/add/observable/empty' 

Observable.empty<Response>();

Answer 4

RxJS6 (without compatibility package installed)

There's now an EMPTY constant and an empty function.

  import { Observable, empty, of } from 'rxjs';

  var delay = empty().pipe(delay(1000));     
  var delay2 = EMPTY.pipe(delay(1000));

Observable.empty() doesn't exist anymore.

Answer 5

Yes, there is am Empty operator

Rx.Observable.empty();

For typescript, you can use from:

Rx.Observable<Response>.from([])