> Hey, I've got a case where I want to apply a function to *some* values
> in a map but not all. For instance:
>
> (def m { :a 1 :b 1 :c 1 :d 1 })
>
> (defn apply-map-fn [m f & ks]
> (into m (zipmap ks (map f (map #(% m) ks)))))
>
> (apply-map-fn m inc :a :c)
>
> => { :a 2 :b 1 :c 2 :d 1 }
>
>
> Is there a more idiomatic way to do this? Something shorter than
> apply-map-fn I wrote? I.e. something where I don't have to use apply-
> map-fn?
>
> Thanks in advance Clojure smarties. =)
Your solution looks quite good to me, although I would get rid of the
double map by composing the two functions -
(defn apply-map-fn
[m f & ks]
(into m (zipmap ks (map (comp f #(m %)) ks))))
Regards,
BG
--
Baishampayan Ghose
b.ghose at gmail.com
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