do you really need that? How about an infinite lazy sequence?
(defn infinite [arg]
(lazy-seq
(Thread/sleep 2000) ;;simulate 2 second retrieval time
(concat (for [i (range 0 arg)]
i) (infinite arg))))
(def a (infinite 3))
(first a) ;;=> sleep 2 seconds, return 0
(take 3 (filter #(= % 2) a)) ;;wait a bit and return 3 twos
(loop [i 0 a (infinite 3)] ;;wait a bit, process 3 twos, and return
"done"
(cond
(= i 3) "done"
(= (first a) 2) (recur (+ i 1) (rest a))
true (recur i (rest a))))
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