Created
June 17, 2020 13:20
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| f1 = (<$> ((:[]) <$>)) | |
| f1 :: (Functor f) => (f [a] -> b) -> f a -> b | |
| :: (Functor f) => (f [a] -> b) -> (f a -> b) | |
| (=<<) :: (Monad m) => (a -> m b) -> m a -> m b | |
| :: (Monad m) => (a -> m b) -> (m a -> m b) | |
| -- Applying f1 to (=<<) | |
| f = f1 (=<<) | |
| f :: (a -> b) -> [a] -> [b] | |
| :: (a -> b) -> ([a] -> [b]) | |
| -- Matching type of `(=<<)` with (f [a] -> b) | |
| f [a] -> b | |
| (e -> [a]) -> b -- as f ~ (e ->) | |
| (a -> m b) -> (m a -> m b) | |
| (a -> [b]) -> ([a] -> [b]) | |
| (e -> [a]) -> ([e] -> [a]) | |
| -- so b ~ ([e] -> [a]) | |
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