lastElement : List a -> a

[renovatorruler]

Create a function (like the sum : List Int -> Int we created yesterday) called lastElement which will take a List a and return the last element of the list.

λ> lastElement [1,2,3,4]
4
λ> lastElement ['x','y','z']
'z'

[amit-singhs]

lastElement : List a -> Maybe a
lastElement xs =
    case xs of 
      [] -> Nothing
      [x] -> Just x
      x::tail -> lastElement tail