-- Can specify the type if we want
twice :: Int -> Int
twice n = n * 2

-- From before
square n = n * n

area length width = length * width


-- Result of square is passed to twice

twiceSquare n = twice (square n)

-- Another example of one function using another

twiceArea n m = twice (area n m)


-- Using the composition operator!  Note: No parameters!

twiceSquareComp = twice . square


-- Defining a fn as the partial application of another

double = (area 2)