Hola,
  I'm looking for a function that updates a map value by calling a
function on it.

(def foo {:a 1})

So instead of this:
  (assoc foo :a (inc (:a foo)))            ; => {:a 2}

Something like this:
  (map-fn foo :a inc)                        ; => {:a 2}

Does that exist somewhere, or should I be doing this in a different
way?  If not, shouldn't it be included?

(defn map-fn
  [m key fn & args]
  (assoc m key (apply fn (get m key) args)))

Cheers,
Jeff

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