[Haskell-cafe] Functor and Haskell

[Kim-Ee Yeoh]

Daryoush Mehrtash-2 wrote:
> 
>> singleton :: a -> [a]
>> singleton x = [x]
>> 
>> Here F is the identity functor, and G is the list functor. And yes, C=D=
>> category of (a subset of) Haskell types.
> 
> Are you saying the function that goes from list functor to singleton
> funtor
> is a natural transformation?
> 

Here *singleton* is the natural transformation from the identity functor
to the list functor.


Daryoush Mehrtash-2 wrote:
> 
> But aren't they functors to different subset of Haskell Types?
> 

They're usually treated as endofunctors on Hask, for reasons
Ross Paterson has given.

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