select takes a callback function which gives you access to the current feature state (see the
Within that function you can pick a specific piece of state.
select returns an Observable which will emit as soon as the selected state changes.
You can use memoized selectors also with the Feature Store...
You only have to omit the feature key when using
This is because the Feature Store is operating on a specific feature state already
(the corresponding feature key has been provided in the constructor).