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.
Source
clojure/contrib/stream_utils.clj:149
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(defn pick
"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."
[n]
(fn [streams]
(let [[v ns] (stream-next (streams n))]
(if (nil? ns)
[nil nil]
[v (assoc streams n ns)]))))
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