[Haskell-cafe] Re: howto tuple fold to do n-ary cross product?

[Miguel Mitrofanov]

Tuples would still be distinguishable from lists, since "cons" changes  
their type: (b,c,d) and (a,b,c,d) would have different types, while  
[b,c,d] and [a,b,c,d] wouldn't.

On 30 Nov 2008, at 20:48, Brandon S. Allbery KF8NH wrote:

> On 2008 Nov 30, at 12:43, Max Rabkin wrote:
>> On Sun, Nov 30, 2008 at 9:30 AM, Luke Palmer <lrpalmer at gmail.com>  
>> wrote:
>>> cross :: [a] -> [b] -> [(a,b)]
>>>
>>> It's just kind of a pain  (you build [(a,(b,(c,d)))] and then  
>>> flatten
>>> out the tuples).  The applicative notation is a neat little trick
>>> which does this work for you.
>>
>> It seems to me like this would all be easy if (a,b,c,d) was sugar for
>> (a,(b,(c,d))), and I can't see a disadvantage to that.
>
>
> No disadvantage aside from it making tuples indistinguishable from  
> lists.
>
> -- 
> brandon s. allbery [solaris,freebsd,perl,pugs,haskell] allbery at kf8nh.com
> system administrator [openafs,heimdal,too many hats] allbery at ece.cmu.edu
> electrical and computer engineering, carnegie mellon university     
> KF8NH
>
>
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