How can I append items to Observable

Question

How do I append items to Observable?

This is some code:

 this.logEntries = this.controllerService.getLog(this.controller.remoteID, this.skip, this.max);          this.logEntries.subscribe(a => {             this.allLogEntries.add(this.logEntries)         }); 

and here is their declarations:

 logEntries: Observable<Log[]>;     allLogEntries: Observable<Log[]> = Observable.empty<Log[]>(); 

I want to append items to allLogEntries as they are being fetched from the web service. How do I do this?

Answer 1

Perhaps the scan operator could interest you. Here is a sample:

obs.startWith([])  .scan((acc,value) => acc.concat(value))  .subscribe((data) => {    console.log(data);  }); 

See this question for more details:

• Angular 2 Updating objects in “real time.”

Answer 2

Take a look at BehaviorSubject:

It's an Observable where you can push a new item as containing object.