Avoid multiple subscriptions while working with Observables
Don’t subscribe to often while working with RxJs. If you are in a situation where you need to get values from many observables in your component don’t manage it imperatively by subscribing to all of them separately but take a full advantage of RxJs and compose your observables.
To get an impression how this approach might help you take a look on following code.
I want to render in my component a filtered and sorted list of cards. All data is stored in ngrx/store and therefore I need to select it at first. By default store.select method returns an observable so I finally end up having two observables with data i need to perform the task. By using the combineLatest method of Observable I get one observable which passes an array of latest values from source observables to its subscriber. This enables me to work with my data from store very conveniently.