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| Both sides previous revision Previous revision Next revision | Previous revision Last revision Both sides next revision | ||
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functor_._haskell [2014/09/15 19:24] nikolaj |
functor_._haskell [2015/04/07 11:54] nikolaj |
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| Line 8: | Line 8: | ||
| -- methods | -- methods | ||
| (<$) :: a -> f b -> f a | (<$) :: a -> f b -> f a | ||
| - | (<$) :: fmap . const | + | (<$) = fmap . const |
| </code> | </code> | ||
| Line 14: | Line 14: | ||
| | fmap f . fmap g $\ \leftrightsquigarrow\ $ fmap (f . g) | | | fmap f . fmap g $\ \leftrightsquigarrow\ $ fmap (f . g) | | ||
| - | ==== Discussion ==== | + | ----- |
| + | === Discussion === | ||
| In Haskell, the first law implies the second. | In Haskell, the first law implies the second. | ||
| + | |||
| + | === Notes === | ||
| + | {{ 5815_89f1_500.png}} | ||
| === Reference === | === Reference === | ||
| - | ==== Parents ==== | + | |
| + | ----- | ||
| === Related === | === Related === | ||
| [[Haskell]], [[Functor]], [[Functor category]] | [[Haskell]], [[Functor]], [[Functor category]] | ||
