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Add example on how a Haskeller would write this function

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Julian Ospald 2015-04-19 19:49:56 +02:00
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VL2.tex
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@ -494,6 +494,8 @@ 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}).