The 5 is just the last part of the equality statement. This might be easier
to see by adding in a "let":
(let [x (__ (sort (rest (reverse [2 5 4 1 3 6]))))
y (-> [2 5 4 1 3 6] (reverse) (rest) (sort) (__))]
(= x y 5))
- James
On 30 April 2014 18:09, Roelof Wobben <rwob...@hotmail.com> wrote:
>
>
> Op woensdag 30 april 2014 18:46:36 UTC+2 schreef James Reeves:
>
>> These two forms are equivalent:
>>
>> (__ (sort (rest (reverse [2 5 4 1 3 6]))))
>>
>> (-> [2 5 4 1 3 6] (reverse) (rest) (sort) (__))
>>
>> The -> macro turns the second form into the first. You can see this by
>> running macroexpand-all:
>>
>> (require '[clojure.walk :refer [macroexpand-all]])
>>
>> (macroexpand-all '(-> [2 5 4 1 3 6] (reverse) (rest) (sort) (__)))
>>
>> This should produce:
>>
>> (__ (sort (rest (reverse [2 5 4 1 3 6]))))
>>
>> - James
>>
>>
>>
> That what I expected. what is the benefit of this if the first forms
> already gives the right answer.
> The only thing I still do not see is what the 5) is doing here.
>
> It looks to me of writing something very difficult where it could be done
> very easy with just the first form.
>
> Roelof
>
>
>
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