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expr -> maybe int

Ruby answered on March 9, 2022 Popularity 1/10 Helpfulness 1/10

answer expr -> maybe int

related expr -> maybe int

expr -> maybe int

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multMaybes :: Maybe Int -> Maybe Int -> Maybe Int
multMaybes Nothing _ = Nothing
multMaybes _ Nothing = Nothing
multMaybes (Just x) (Just y) = Just (x * y)

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Source: stackoverflow.com

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Contributed on Mar 09 2022

Ruby

0 Answers Avg Quality 2/10

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expr -> maybe int

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addMaybes Nothing _ = Nothing
addMaybes _ Nothing = Nothing
addMaybes (Just x) (Just y) = Just (x + y)

subMaybes Nothing _ = Nothing
subMaybes _ Nothing = Nothing
subMaybes (Just x) (Just y) = Just (x - y)

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Source: stackoverflow.com

Tags: expr int whatever

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Contributed on Mar 09 2022

Ruby

0 Answers Avg Quality 2/10

expr -> maybe int

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expression :: Math -> Maybe Int
expression (Val n)        = Just n
expression (Add e1 e2)    = liftA2 (+) (expression e1) (expression e2)
expression (Sub e1 e2)    = liftA2 (-) (expression e1) (expression e2)
expression (Mult e1 e2)   = liftA2 (*) (expression e1) (expression e2)
expression (Div e1 e2)
  | r2 /= Just 0          = liftA2 div (expression e1) r2
  | otherwise             = Nothing
  where r2 = expression e2

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Source: stackoverflow.com

Tags: int whatever expr

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Contributed on Mar 09 2022

Ruby

0 Answers Avg Quality 2/10

expr -> maybe int

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expr -> maybe int

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expr -> maybe int

expr -> maybe int

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