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シリーズ: haskell haskell 7 行 · 更新日 2026-02-03

exercise_5_2.hs

haskell/Week_6_Lab/exercise_5_2.hs

-- Define the mapMaybe function
mapMaybe :: (a -> b) -> [Maybe a] -> [b]
mapMaybe _ [] = []  -- Base case: empty list returns an empty list
mapMaybe f (x:xs) =
  case x of
    Just value -> f value : mapMaybe f xs  -- Apply the function to the value inside Just and continue
    Nothing    -> mapMaybe f xs           -- Skip Nothing values and continue
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