(let [op (atom +)]
(defn alt-op [a b]
((swap! op #(if (= % +) - +)) a b)))
(map alt-op (range 1 10))
On Thu, Nov 13, 2014 at 10:09 PM, Robert Levy <r.p.l...@gmail.com> wrote:
> But for "applyv" you could do this:
>
> (*reduce + *(*map *(*comp eval list*) (*cycle *[*+ -*]) (*range 1 10*)))
>
> On Thu, Nov 13, 2014 at 10:06 PM, Robert Levy <r.p.l...@gmail.com> wrote:
>
>> Is that any more elegant than Dave's (reduce + (map * (cycle [1 -1])
>> (range 1 n))) though? I would say that's the best actually sensible
>> answer proposed in this thread.
>>
>> On Thu, Nov 13, 2014 at 9:54 PM, Andy L <core.as...@gmail.com> wrote:
>>
>>>
>>>
>>> On Thu, Nov 13, 2014 at 7:23 PM, Robert Levy <r.p.l...@gmail.com> wrote:
>>>
>>>> You don't need this for numbers over 900 right?
>>>>
>>>>
>>> I see what you mean. But no, I just practice and try to capture
>>> patterns. So, going after your example I got following:
>>>
>>> (reduce + (map applyv (cycle [+ -]) (range 1 10)))
>>>
>>> where something like applyv perhaps exists,
>>> (defn applyv [f a] (f v)) - but I am not sure how to find it.
>>>
>>> A.
>>>
>>>
>>>
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>>
>>
>
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