I am finding more and more use-cases for doing something when data changes that
aren't necessarily to do with a UI component.
Ideally I want to do something like (outside any GUI):
(defn my-controller-for-concern-x
(let [source (subscribe [:....])]
(do-something-when-this-changes @source)))
and that (do-something-when-this-changes) be called whenever @source changes.
But that feels dangerous and a possible memory leak. Am I being overly
cautious/is there a better way?
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