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;; this one looks much cleaner, but it holds onto the heads of the lists
(defn filter-collecting [predicate collector & lists]
(let [tuples (apply map vector lists)
filtered (filter #(apply predicate %) tuples)]
(map #(apply collector %) filtered)))
;; less garbage, but uglier
(defn filter-collecting [predicate collector & lists]
(map #(apply collector %) (filter #(apply predicate %) (apply map vector lists))))
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