I suggest using proteus https://github.com/ztellman/proteus for performant 
local mutation.

On Thursday, March 20, 2014 3:34:20 PM UTC-4, Andy Smith wrote:
>
>
> Is is very bad form to use local mutable state to solve problems like :
>
> https://www.4clojure.com/problem/114
>
> i.e. 
>
> (fn [n f xs] (let [c (atom 0)] (take-while #(if (f %) (> n (swap! c inc)) 
> true) xs)))
>
> If so, what is the strongest reason to reject this kind of code? Since its 
> a local atom it ought to be thread-safe right?
>
> Thanks
>
> Andy
>

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