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alandipert/invert.clj

Created February 13, 2013 23:46
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invert.clj
(defn invert
[g]
(let [maps (map (fn [[name groups]] (zipmap groups (repeat #{name}))) g)]
(reduce (partial merge-with into) maps)))
(comment
(invert {"sally" #{"shipping"}, "joe" #{"shipping" "receiving"}})
;=> {"shipping" #{"joe" "sally"}, "receiving" #{"joe"}}
)
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