如何从Elm中的Array/List中删除给定索引处的项目？

Question

i在给定的索引处删除项目的最优雅方法是什么Array？在给定的List？

Answer 1

我能想到的最好的:

removeFromList i xs =
  (List.take i xs) ++ (List.drop (i+1) xs) 

removeFromArray i =
  Array.toList >> removeFromList i >> Array.fromList 

Answer 2

这应该非常有效：

remove : Int -> Array a -> Array a
remove i a =
  let
    a1 = Array.slice 0 i a
    a2 = Array.slice (i+1) (Array.length a) a
  in
    Array.append a1 a2