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- And now watch this:
- \begin{haskellcode}
- addTwo :: [Int] -> [Int]
- addTwo xs = map (\x -> x + 2) xs
-
- square :: [Int] -> [Int]
- square xs = map (\x -> x * x) xs
-
- absList :: [Int] -> [Int]
- absList xs = map (\x -> abs x) xs
- -- a haskeller would write, GHCi...
- absList = map abs
- \end{haskellcode}
- \pause
- Cool, right? So now we have abstracted out the \textbf{recursion pattern} that is all the same for those 3 functions. \code{map} is actually part of the standard library (called \emph{Prelude}).
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