Another non-standard solution you could try is to use the state monad from
the monad library.
On Apr 21, 2012 3:22 PM, "Sergey Didenko" <sergey.dide...@gmail.com> wrote:

> There is also a non-idiomatic way - transform your code to use a
> native Java data structure like ArrayList or primitive array.
>
> You may want it for the speed or if the mutable algorithm is more
> readable. Anyway isolation of the mutable code is always a good
> advice.
>
> (defn new-game []
>
>  (let [board (java.util.ArrayList. (repeat 9 nil))]
>
>    (fn [n i]
>
>      (cond
>
>        (= n :x)(.set board i 'x)
>
>        (= n :o)(.set board i 'o)
>
>        (= n :print) (println board)))))
>
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