First of all really enjoying the book so far, big thanks to Bartosz and all the other contributors!
I'm reading section 8.5, towards the very beginning:
type Writer a = (a, String)
I said that the embellishment was somehow related to endofunctors. And, indeed, the Writer type constructor is functorial in a.
Ah, but it can't be because of instance Functor ((,) a) from base...
We don’t even have to implement fmap for it, because it’s just a simple product type.
which we cannot change!
I think this could use a note that we are ignoring some practical Haskell issues for the purpose of keeping the discussion focused on what's important.
First of all really enjoying the book so far, big thanks to Bartosz and all the other contributors!
I'm reading section 8.5, towards the very beginning:
Ah, but it can't be because of
instance Functor ((,) a)from base...which we cannot change!
I think this could use a note that we are ignoring some practical Haskell issues for the purpose of keeping the discussion focused on what's important.