Hi,
Does using Array.indexedMap suit you?
import Array exposing (Array)
submap : Int -> Int -> (a -> a) -> Array a -> Array a
submap start end func =
Array.indexedMap (\i -> if i >= start && i < end then func else
identity)
Of course the result must be of the same type in this case.
On Friday, November 17, 2017 at 9:25:22 AM UTC+1, Francisco Ramos wrote:
>
> Hi there,
>
> Was wondering how I can map over an array with a start and end indexes. I
> know I could slice the array and then map, but performance is a concern and
> slicing is O(N) where N = end - start, plus the actual mapping, another
> O(N).
>
> Maybe there is another way where I just loop once over the array?
>
> Thanks a lot,
> Fran
>
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