On Wed, Jul 3, 2013 at 10:31 AM, Dragan Djuric <draga...@gmail.com> wrote:

> Yes, I agree completely, when we stay inside Haskell. However, Clojure is
> dynamic. Here are two objects that are equal despite having different types:
>

If you're going to talk about "category theory concepts", then that's the
constraint you have to operate under. "monad" is constituted by the laws,
the laws involve operations with a certain type, and that's just it. It's
not a matter of being in Haskell or not, it's a matter of accurately
implementing the concepts you claim to be implementing. I would actually
maintain that a call to bind whose first argument is a vector but which
returns a list (because it's implemented with mapcat, say) is not changing
the monad, because you're actually operating in the list monad (what
algo.monads calls the sequence monad, I think) and while the implementation
might choose different ways of mapping the function depending on the type
of the first argument to bind, that's an implementation detail.


-- 
Ben Wolfson
"Human kind has used its intelligence to vary the flavour of drinks, which
may be sweet, aromatic, fermented or spirit-based. ... Family and social
life also offer numerous other occasions to consume drinks for pleasure."
[Larousse, "Drink" entry]

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