How about:
(->> (map * (cycle [1 -1]) (range 1 n))
(reduce +))
?
Dave
On Thu, Nov 13, 2014 at 5:31 PM, Andy L <core.as...@gmail.com> wrote:
> Hi,
>
> All I was able to come up with was this
>
> (defn altsum[n] (reduce + (map * (range 1 (inc n)) (interpose -1 (repeat
> 1)))))
>
> ... works quite well, however I was wondering if there is more idiomatic
> way to write that.
>
> Thanks,
> Andy
>
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