Seems you want a cross between update-in and merge. Maybe something like
this?
(defn combine
"Merge maps, recursively merging nested maps whose keys collide."
([] {})
([m] m)
([m1 m2]
(reduce (fn [m1 [k2 v2]]
(if-let [v1 (get m1 k2)]
(if (and (map? v1) (map? v2))
(assoc m1 k2 (combine v1 v2))
(assoc m1 k2 v2))
(assoc m1 k2 v2)))
m1 m2))
([m1 m2 & more]
(apply combine (combine m1 m2) more)))
(warning: scarcely tested much)
On Thu, Apr 25, 2013 at 4:41 PM, Joachim De Beule <
joachim.de.be...@gmail.com> wrote:
> Hi list,
>
> I was searching for an "easy" way to combined nested maps, e.g. as in
>
> (combine {:foo {:bar "baz"}} {:foo {:x "y"}})
> => {:foo {:bar "baz", :x "y"}}
>
> I would expect that there is some core map operation to do this, but
> neither merge nor unify work as they simply return {:foo {:x "y"}}, and I
> don't see anything else. Am I missing something?
>
> Joachim.
>
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