Teiva Harsanyi teivah

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Software Engineer @google | The Coder Cafe newsletter | 📖 100 Go Mistakes author | 改善

teivah / functor.hs

Created March 16, 2024 12:29

	fmapEx :: Maybe Int
	fmapEx = fmap (+ 1) Nothing -- Nothing

teivah / functor.hs

Last active March 16, 2024 15:38

	fmapEx :: Maybe Int -- A function returning a Maybe Int
	fmapEx = fmap (+ 1) (Just 42) -- Just 43

teivah / applicativeEx.hs

Created March 16, 2024 11:56

	applicativeEx :: Maybe Int
	applicativeEx = (+ 1) <$> Just 42 -- Just 43

teivah / applicativeEx.hs

Created March 16, 2024 01:56

	applicativeEx :: [Int]
	applicativeEx = [(+ 1)] <*> [1, 2, 3] -- [2, 3, 4]

teivah / applicativeEx.hs

Created March 16, 2024 01:48

	applicativeEx :: Maybe Int
	applicativeEx = Just (+ 1) <*> Just 42 -- Just 43

teivah / applicativeEx.hs

Created March 16, 2024 01:43

	applicativeEx :: Maybe Int
	applicativeEx = Just (+ 1) <*> Just 42 -- Just 43

teivah / fmap.hs

Last active March 16, 2024 01:12

	fmapEx :: [Int] -- A function returning a list
	fmapEx = fmap (+ 1) [1, 2, 3] -- [2, 3, 4]

teivah / fmap.hs

Last active March 16, 2024 00:43

	fmapEx :: Maybe Int
	fmapEx = fmap (Just (+ 1)) (Just 42) -- Does not compile

teivah / fmap.hs

Last active March 16, 2024 00:34

	fmapEx :: Maybe Int
	fmapEx = fmap (+ 1) Nothing -- Nothing

teivah / fmap.hs

Last active March 16, 2024 01:13

	fmapEx :: Maybe Int -- A function returning a Maybe Int
	fmapEx = fmap (+ 1) (Just 42) -- Nothing