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Add a strict version of length #1

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Add a strict version of length #1

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5 changes: 5 additions & 0 deletions E01/A3.hs
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,7 @@ module E01.A3 where
-- nicht zur Verfügung, daher definieren wir sie hier erneut, müssen aber
-- den automatischen Import mit hiding unterdrücken.
import Prelude hiding (length, maximum)
import Data.List (foldl')

-- (a)
l :: [[Int]]
Expand Down Expand Up @@ -44,6 +45,10 @@ length (x:xs) = 1 + length xs
length1 :: [Int] -> Int
length1 = foldr (\x y -> y + 1) 0

-- Alternativ: Strikte Faltung mit Data.List.foldl'.
length2 :: [Int] -> Int
length2 = foldl' (\x _ -> x + 1) 0

maximum :: [Int] -> Int
maximum [] = error "A3.maximum: empty list"
maximum [x] = x
Expand Down