I wrote this based on assoc-in. If anyone thinks this should be in
core or contrib, feel free to use it.
(defn assoc-in-by
"'Updates' a value in a nested associative structure, where ks is a
sequence of keys and (f v) is the new value and returns a new nested
structure.
If any levels do not exist, hash-maps will be created."
[m [k & ks] f]
(if ks
(assoc m k (assoc-in-by (get m k) ks f))
(assoc m k (f (get m k)))))
user> (assoc-in-by {:1 1 :2 {:3 3}} [:2 :3] inc)
{:1 1, :2 {:3 4}}
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