As a general rule, if you have something that has the semantics of a
pure function, and you can see how to implement it by banging on an
atom with swap! in a loop that consumes a sequence, then you can
transform it to use reduce.
If you have:
(defn foo [coll]
(let [x (atom bar)]
(dorun [y coll]
(swap! x f y))
@x))
you can change it to:
(defn foo [coll]
(reduce f bar coll))
:)
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