diff --git a/VL2.tex b/VL2.tex index 3c81489..591ef68 100644 --- a/VL2.tex +++ b/VL2.tex @@ -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}).