行为主题与Observable错误处理

Question

Im using rxJS in Angular and have a set of Behavior Subjects that are exposed as a readonly Observable

public _data = new BehaviorSubject<DataItem[]>([]);
public readonly data$ = this._data.asObservable();

now I have noticed that if I subscribe directly to the BehaviorSubject and there is an error it will throw the error to the console.

but if I subscribe to the Observable with same error I don't get any messages and the listener is then unsubscribed automatically.

I know this is the expected behavior but...

I would like to know what is the pattern to avoid code duplication on errors eg

this.myDataService.data$.subscribe(d=> throwSomeError(), e=> handleError(e));
//or use this:
this.myDataService.data$.subscribe(d=> throwSomeError()).catch(e=> handleError(e));

the handleError(e)

Answer 1

The second option will work better as BehaviorSubject will always kill the stream on an error.

Here's more info:

How do I throw an error on a behaviour subject and continue the stream?