Do I have to unsubscribe from ActivatedRoute (e.g. params) observables?

Question

I find many examples where ActivatedRoute Observables like params or url are subscribed but not unsubscribed.

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Answer 1

The component will be destroyed and the routerState will become unreferenced when the router navigates to a different route, which will make them free to get garbage collected including the observable.

If you pass around references to this component to other components or services, the component won't be garbage collected and the subscription would be kept active, but I'm sure (without verifying) that the observable will be completed by the router when navigating away and cause the subscription to cancel.