4 ms·
https://play-haskell.tomsmeding.com/saved/OuylO1bg https://play-haskell.tomsmeding.com/saved/OuylO1bg So (fmap (const 1) Just) means map `const 1` over a funct
by unhammer 4y ago
https://play-haskell.tomsmeding.com/saved/OuylO1bg https://play-haskell.tomsmeding.com/saved/OuylO1bg
So (fmap (const 1) Just) means map `const 1` over a function of type `a->Maybe a`, and ends up being equivalent to simply (const 1). This works because functions (r->) also have functor instances.