Should I unsubscribe from Cold Observable?

Question

I know that it\'s good practice to unsubscribe from Observable to prevent memory leak.

But if it\'s Cold Observable

Answer 1

Since Cold Observables are finite you dont have to unsubscribe.

Unsubscribe when:

• Infinite Obesrvables, ex. interval()
• If subscribed to (Subject, BehaviorSubject, ReplaySubject, AsyncSubject)

In case of ReplaySubject you should unsubscribe if it cache life time is not provided

In case of AsyncSubject you should unsubscribe if it is not completed

• Websocket stream
• Abstract control ex. valueChanges()
• Renderer2.listen()
• Events streams ex. formEvent()
• NgRx Store

Do not unsubscribe when:

• If stream is ending himself ex. of('1','2')
• Router events, all Observables from Router are unsubscribing them self
• AsyncPipe
• Finite Observable ex. http.get()
• EventEmmiter

Subscribe have to be unsubscribed if it would not hit complete or error.

If I am wrong or missing something please let me know. Thanks ;)