pick(clojure.contrib.stream-utils)

Return the next value of stream argument n inside a stream transformer. When used inside of defst, the name of the stream argument can be used instead of its index n.

; clojure/contrib/stream_utils.clj:148
(defn pick
  [n]
  (fn [streams]
    (let [[v ns] (stream-next (streams n))]
      (if (nil? ns)
	[nil nil]
	[v (assoc streams n ns)]))))

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