Wanna play golf?
(defn filter-collecting [predicate collector & lists]
(lazy-seq
(loop [lists lists out []]
(if (empty? (first lists))
(reverse out)
(let [heads (map first lists)]
(if (apply predicate heads)
(recur (map rest lists) (cons (apply collector heads) out))
(recur (map rest lists) out)))))))
;; usage:
;; (filter-collecting
;; (fn [x y] (< x y))
;; (fn [x y] (+ x y))
;; '(1 7 3 9)
;; '(5 5 5 5))
;; ==> (6 8)
More detail at: http://blog.fogus.me/2009/08/14/clojure-golf-episode-1/
-m
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