On Tue, Dec 7, 2010 at 12:04 AM, Alex Baranosky
<[email protected]> wrote:
> I think it will be fun to come up with a solution that will work with n
> maps:
> (defn multi-fmap [f &maps]
> ...)
> i.e.
> (multi-fmap #(+ %1 %1 %2 ) {:a 1 :b 2} {:a 3 :b 4}) => {:a 5 :b 8}
> (multi-fmap #(+ %1 %2 %3 ) {:a 1 :b 2} {:a 3 :b 4} {:a 5 :b 6}) => {:a 9 :b
> 12}
(defn multi-fmap [f & maps]
(into {}
(for [k (keys (first maps))]
[k (apply f (map #(get % k) maps))])))
works for your two test-cases. It assumes that the keys you're
interested in are exactly the keys of the first map; if any map is
missing a key the function will get a nil argument in the position
corresponding to that map when computing the result's value for that
key.
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