Replace a sublist within a list with another list

This is just a very short snippet but someone might find this useful.
It took me a while to figure out how to do this right in haskell. In case you know of a better solution please tell me about it in the comment section.

replaceAll a b c = 
    concat (intersperse b (splitRegex regex c))
    where 
      regex = Text.Regex.mkRegex a

This is just a prove.

This is just a prove.

Calculate your age in Haskell

You have to pass the current date as the first triple and your birthday as the second one.

age :: (Int,Int,Int) -> (Int,Int,Int) -> Int
age (d, m, y) (d2, m2, y2)
   | m > m2 = y - y2
   | m == m2 && d >= d2 = y - y2
   | otherwise = y - y2 - 1

Triangle verification in Haskell

As promised here is my first code snippet. This code can tell you whatever 3 numbers form a valid triangle or not, and if they do it also tells you what kind of triangle.

max3 , min3, middle :: Int -> Int -> Int -> Int

max3  a b c = max (max a b) c

min3  a b c = min (min a b) c

middle a b c = max (min a b) (min b c)

sort3 :: Int -> Int -> Int -> (Int,Int,Int)

sort3 a b c = ((max3 a b c), (middle a b c), (min3 a b c))

data Triangle = Failure | Isosceles | Equilateral | Scalene
                deriving(Show)

analyse :: (Int,Int,Int) -> Triangle
analyse (a,b,c)
    | a >= b + c = Failure
    | b == c = Equilateral
    | (a == b) && (b == a) = Isosceles
    | otherwise = Scalene

safe_analyse :: Int -> Int -> Int -> Triangle
safe_analyse a b c  = analyse (sort3 a b c)

 

Hi there!

Now I've finally published my first post on this blog and it is nothing more than an announcement for future posts. Right now I'm learning Haskell, a beautiful purely functional language. While I'm working through the book I've purchased I'll publish code snippets here. They might be useful for someone...sometime...somehow...