If not, I think it's pretty useful. There should be an easy way to
apply functions to maps' values by keys.
(defn update
[m & keyfuns]
(let [[key fun & rest] keyfuns]
(if (and key fun)
(recur (assoc m key (fun (key m))) rest)
m)))
(def foo {:a 5 :b 7})
(def bar (update foo :a inc :b #(+ 5 %)))
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