How to dispatch multiple actions from an effect in ngrx conditionally

I am a back-end developer starting with front-end development for a project I am working on. The front-end uses Angular7 and NgRx. I have studied a lot in the last 4 days, but here is something I am stuck with and would appreciate your help.

I learnt that we can dispatch multiple actions from an effect in NgRx by returning an Observable array having multiple actions. I want to dispatch one of the action in the array based on a condition.

My code looks something like this

@Effect()
  something$: Observable<Action> = this.actions$.pipe(
    ofType(ActionType),
    switchMap.(action: any) => {
       return service.call(action.payload)
         .pipe(
             switchMap((data: ReturnType) => [ 
                new Action1(),
                new Action2(),
              ]),
        catchError(error handling)
      );
    }),
   );

and I want to achieve something like this

   @Effect()
  something$: Observable<Action> = this.actions$.pipe(
    ofType(ActionType),
    switchMap.(action: any) => {
       return service.call(action.payload)
         .pipe(
             switchMap((data: ReturnType) => [ 
                 if(condition)
                   new Action1()
                  else
                    new Action1.1() ,
                new Action2(),
              ]),
        catchError(error handling)
      );
    }),
   );

I think its my lack of knowledge of RxJs, which is preventing me to implement the condition.

You can dispatch multiple actions or specific actions by letting conditional ifs determine what iterable to return

I recommend you read: https://www.learnrxjs.io/operators/transformation/switchmap.html

  @Effect()
  something$: Observable<Action> = this.actions$.pipe(
    ofType(ActionType),
    switchMap(action: any) => {
       return service.call(action.payload)
         .pipe(
             switchMap((data: ReturnType) => {
                 let actionsToDispatch = [];
                 if(condition) {
                   actionsToDispatch.push(new SomeAction())
                 } else {
                   actionsToDispatch.push(new SomeOtherAction())
                 }
                 return actionsToDispatch
              }),
              catchError(error handling)
      );
    }),
   );