maxdiff.fsx

(*
    You must implement a function maxDiff that return the difference between the biggest and the smallest value in a list(lst) received as parameter.

    The list(lst) contains integers, that means it may contain some negative numbers.
    
    If the list is empty or contains a single element, return 0.
    
    The list(lst) is not sorted.
    
    maxDiff([1, 2, 3, 4]); //return 3, because 4 - 1 == 3
    maxDiff([1, 2, 3, -4]); //return 7, because 3 - (-4) == 7

taken from: https://www.codewars.com/kata/588a3c3ef0fbc9c8e1000095/train/fsharp

*)

let ``max diff`` arr =
    match arr with
    |[||] | [|_|] -> 0
    |_ -> abs((arr |> Seq.max) - (arr |> Seq.min))