is there a safer operator I can use, which would give me the latest value or null, sort of like

BehaviorRelay.value

?

You can

amb

your upstream with

Observable.just(NO_VALUE)

(where

NO_VALUE

is some sentinel value that makes sense with your types). If you put the sentinal last in the list of arguments to

amb

, you’ll get the behavior you want.

wouldnt the

just

always win?

Yep, if all the arguments emit synchronously then the winner depends on order in the list.

sweet