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Implementation of map-invert that preserves duplicates by cons entries into a sequence.
;; See: http://codereview.stackexchange.com/q/6682/9032
(defn map-invert-preserve-dups [m]
(apply merge-with into
(for [[k v] m]
{v [k]})))
(->> "http://www.weeklyscript.com/Pulp%20Fiction.txt"
(slurp)
(re-seq #"\w{5,}")
(frequencies)
(map-invert-preserve-dups)
(sort)
(reverse)
(take 25))
([272 ("VINCENT")] [214 ("JULES")] [182 ("Butch")] [162 ("Vincent")] [147 ("BUTCH")] [94 ("Jules")] [92 ("FABIENNE")] [89 ("fuckin")] [78 ("Marsellus")] [77 ("gonna")] [58 ("LANCE")] [56 ("about")] [54 ("YOUNG")] [51 ("through")] [50 ("looks" "there")] [45 ("never")] [44 ("front")] [43 ("Jimmie" "little")] [42 ("their")] [41 ("right" "NIGHT" "takes")] [37 ("JIMMIE" "other")] [35 ("still")] [34 ("PUMPKIN")] [33 ("Fabienne")] [32 ("think" "watch" "table" "Maynard")])
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