Create one-time subscription

Question

I need to create a subscription to an Observable that is immediately disposed of when it is first called.

Is there something like:

obser         


        

Answer 1

If you want to call an Observable only one time, it means you are not going to wait for a stream from it. So using toPromise() instead of subscribe() would be enough in your case as toPromise() doesn't need unsubscription.