What's the best of following approaches?
Outer subscription, early deref
(defn component [msg]
[:p msg]))
(let [msg (rf/subscribe [:msg])]
[component @msg]
Outer subscription, late deref
(defn component [msg]
[:p @msg]))
(let [msg (rf/subscribe [:msg])]
[component msg]
Inner subscription, early deref
(defn component []
(let [msg @(rf/subscribe [:msg])]
[:p msg])))
Inner subscription, late deref
(defn component []
(let [msg (rf/subscribe [:msg])]
[:p @msg])))
When I keep the inner component pure using outer subscription, I can end up with many arguments that need to be passed through deeply nested structure of often unrelated parents. That can easily become a mess.
When I subscribe inside inner component, it becomes impure, losing easy testability.
Also, I wonder if there is an important difference between early and late dereferencing, other than I have to pass reagent/atom when testing the latter.