because in haskell functions are curried, function_name :: param1 -> param2 -> return is a function that if you only give it param1 it returns a function th

because in haskell functions are curried, function_name :: param1 -> param2 -> return is a function that if you only give it param1 it returns a function that takes an argument of param2Type and returns returnType. This way you can easily compose functions