I need a function that produces the 'next' value from a lazy-seq --
something like a Python generator. I imagine it would have to be some
sort of closure like:
(def next-sine
(let [sines (atom (cycle (map sin (range 0 6.28 0.01))))]
#(swap! sines rest)))
Is there a more idomatic way of doing this? I don't see a lot of use
of closures in clojure...
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