Haskell Function

These are operations on haskell data. You can view function signatures using Haskell :type

Types

• Haskell Infix Function
• Haskell Prefix Function
• Haskell Postfix Function

Defined Functions

myfunction :: Int -> Int -> Int
myfunction x y = x+x + y*2

Generic Type Functions

head :: [a] -> a

Allows this function to work with any datatype and return that same datatype generic

Generic with Haskell Typeclass

square Num => a -> a

Haskell Throwaway Arguments

implies :: Bool -> Bool -> Bool
-- throwaway second arg
implies False _ = True 
implies True False = False 
implies True True = True 

Haskell Rest of Arguments

-- call it repeatTwice'
repeatTwice' [] = []
-- first list element and then the rest of the list
repeatTwice' (x:xs) = x : x : repeatTwice' xs