Thanks everyone- that's been really useful.

And yes, frequencies, really throws me every time (as do some of the 
unintuitively - to me - named functions).

On Wednesday, 10 April 2013 18:27:58 UTC+1, edw...@kenworthy.info wrote:
>
> So, page 143 of Clojure Programming has an implementation of Conway's Life:
>
>   (defn step
>   "Yields the next state of the world"
>   [cells]
>   (set (for [[loc n] (frequencies (mapcat neighbours cells))
>
>     :when (or (= n 3) (and (= n 2) (cells loc)))]
>
> loc))) 
>
> The book claims this to be "an elegant implementation'.
>
> Now it's been a long while since I wrote code to put food on the table - 
> but back then if I saw C or C++ code written like this I would describe it 
> as obfuscated - the sort of thing I would expect to see in the (now 
> defunct?) annual obfuscated C competition. It's concise and rather clever, 
> certainly, but hardly self-documenting: it's not very clear what it's doing 
> at all- with a couple of magic numbers thrown in for good measure. Rather 
> arcane in fact.
>
> Is it just me? Is this considered to be good Clojure code and I'm just 
> hopelessly out of touch and need to get with the programme?
>
>
>
>
>  

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