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list comprehensions!

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This commit is contained in:
Logan McGrath 2021-08-13 16:41:59 -07:00
parent 7699137716
commit 82069dd346
1 changed files with 1 additions and 5 deletions
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lib/Homework/Ch01.hs
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@ -23,12 +23,8 @@ doubleEveryOther = revDigits . go []
go acc [] = acc
sumDigits :: [Integer] -> Integer
sumDigits = sumDigits' . flattenDigits . eachToDigits
sumDigits digits = foldDigits 0 (+) [y | x <- digits, y <- toDigits x]
where
eachToDigits = foldDigits [] (\n acc -> toDigits n : acc)
flattenDigits = foldDigits [] (++)
sumDigits' = foldDigits 0 (+)
foldDigits acc f (x : xs) = foldDigits (f x acc) f xs
foldDigits acc _ [] = acc