I'm looking to do some operations upon the data in an associative
structure. What do you think about this method of hijacking the
definition of assoc-in? Is there some better way to do what I'm doing
here?
user> (defn op-in [op m [k & ks] v]
(if ks
(assoc m k (op-in op (get m k) ks v))
(assoc m k (op (get m k) v))))
#'user/op-in
user> (def union-in (partial op-in clojure.set/union))
#'user/union-in
user> (union-in {:a [#{1 2}]} [:a 0] #{1 7 8})
{:a [#{1 2 7 8}]}
user> (def conj-in (partial op-in conj))
#'user/conj-in
user> (conj-in {:a [#{1 2}]} [:a 0] 7)
{:a [#{1 2 7}]}
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