Angular/RxJs When should I unsubscribe from `Subscription`

Question

When should I store the Subscription instances and invoke unsubscribe() during the NgOnDestroy life cycle and when can I simply ignore them?

Answer 1

Another short addition to the above mentioned situations is:

• Always unsubscribe, when new values in the subscribed stream is no more required or don't matter, it will result in way less number of triggers and increase in performance in a few cases. Cases such as components where the subscribed data/event no more exists or a new subscription to an all new stream is required (refresh, etc.) is a good example for unsubscription.