On Tuesday, February 17, 2015 at 10:24:29 PM UTC-5, Udayakumar Rayala wrote:
>
> Then probably (apply concat) is better than (mapcat identity) isnt it?
>
> What is (cons ::sentinel)? Why do you need it here?
>
It'll drop the wrong elements otherwise:
=> (->> (range 1 22)
(partition 5 5 nil)
(mapcat next))
(2 3 4 5 7 8 9 10 12 13 14 15 17 18 19 20)
All the partitions need to be shifted by one position to the left, so the
elements to drop are at their left edges, if we want to use the efficient
"next" instead of the evil linear-time "butlast" in the later step. But
that can be done by prepending a dummy element to the input, which will
conveniently go away as one of the elided elements.
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