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/chrisvest-4clojure-solution63.clj

Created May 3, 2011 18:05
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chrisvest-4clojure-solution63.clj
;; chrisvest's solution to http://4clojure.com/problem/63
(fn [f coll]
(reduce (fn [m x]
(let [k (f x)]
(update-in m [k] #(conj (or % []) x))))
{} coll))
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