Do I have to store all subscriptions in properties ?

[rostamiani]

Do I have to store the subscription to a variable to get it unsubscribed?
I used httpClient services in my project just like this:

this.commerceService.getTotalList(this.listOptions).subscribe(
    // Do whatever
);

Do I have to store all subscriptions in properties ?

[Netanel Basal]

Yes, if you're not using the arrayName option.