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- So how do our \hinline{sum}, \hinline{prod} and \hinline{length} functions look like if we use our \hinline{fold} abstraction?
- \pause
- \begin{haskellcode}
- sum :: [Int] -> Int
- sum xs = fold 0 (\x y -> x + y) xs
- -- a Haskeller would write
- sum = fold 0 (+)
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- prod :: [Int] -> Int
- prod xs = fold 1 (\x y -> x * y) xs
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- length :: [a] -> Int
- length xs = fold 0 (\x y -> 1 + y) xs
- \end{haskellcode}
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