You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
37 lines
652 B
37 lines
652 B
data A = True' | False'
|
|
deriving Show
|
|
|
|
foo :: A -> Integer
|
|
foo True' = 1
|
|
foo False' = 0
|
|
|
|
data P3 = P Bool A -- P (Bool x A)
|
|
|
|
data BigP = P1 Bool A | P2 Integer
|
|
deriving Show
|
|
|
|
bar :: BigP -> Integer
|
|
bar (P1 _ _) = 1
|
|
bar (P2 _) = 2
|
|
|
|
int_plus_3 :: Integer -> Integer
|
|
int_plus_3 n = n + 3
|
|
|
|
-- examples
|
|
comp :: BigP -> Integer
|
|
comp = int_plus_3 . bar
|
|
-- same as: int_plus_3 $ bar $ P2 10
|
|
|
|
double_arg :: Integer -> Integer -> Integer
|
|
double_arg a b = a + b
|
|
|
|
partially_applied :: Integer -> Integer
|
|
partially_applied = double_arg 7
|
|
|
|
|
|
func_arg :: (Integer -> Integer) -> Integer -> Integer
|
|
func_arg f b = f b
|
|
|
|
|
|
main :: IO ()
|
|
main = putStrLn "Hello world"
|
|
|