list-2.hs

 -– Empty list
[]
 –- We use the cons operator (:) to combine the element 3 (an integer)
 -- and an empty list (which can take on the type of integer list)
3 : []
-- The cons operator is right-associative. (3 : []) is also of type integer
-- list, we use the cons operator again to add the element 2 in front of it
2 : (3 : [])
-- The cons operator is right-associative. (2 : 3 : []) is also of type integer
-- list, we use the cons operator again to add the element 1 in front of it
1 : (2 : (3 : []))