first elem to the last list haskell code example

Example 1: last element of list haskell

list = [1, 2, 3, 4]

last [a] -> a
last [x] 	= x
last (_:xs) = last xs

last list -- 4

Example 2: first element in list haskell

list = [1, 2, 3]

head :: [a] -> a
head (x:_) = x

head list -- 1