On Wed, Dec 16, 2009 at 1:33 PM, samppi <[email protected]> wrote:
> I'm using a vector as a stack. I want to apply a function–let's call
> it modify-element, one argument—to the elements from k to (- (count a-
> vector) k).
>
> Right now, I have something like (not tested yet):
> (reduce #(update-in %1 [%2] modify-element) a-vector (range k (-
> (count a-vector) k)))
>
> Is there a better way?
Not sure it's better, but I find this more readable:
(defn stack-apply [n f stack]
(if (zero? n)
stack
(conj (stack-apply (dec n) f (pop stack))
(f (last stack)))))
user> (let [stack [1 2 3 4 5]
f #(* 100 %)]
(stack-apply 3 f stack))
[1 2 300 400 500]
Best,
Graham
>
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