Value of the last element of a list

Question

how to get the value of the last element of a List? I\'ve noted that List.hd (or .Head) return an item, while List.tl (or .Tail) returns a List.

Is rev the List and

Answer 1

Below code worked fine with me, I've an array of integers, want to start from the 5th item, then take it minus the item number

Sum of [Array(xi) - Array(xi-5)] where i start at 5

The code used is:

series |> Array.windowed 5
       |> Array.fold (fun s x -> 
                            (x |> Array.rev |> Array.head) -  (x |> Array.head) + s) 0
       |> float