[Haskell-cafe] A functional programming solution for Mr and Mrs Hollingberry

Artyom Kazak artyom.kazak at gmail.com
Mon May 21 00:54:27 CEST 2012

Andreas Pauley <apauley at gmail.com> писал(а) в своём письме Sun, 20 May  
2012 20:33:13 +0300:

> I want to see how elegant a solution I can get in a functional
> language, given that the problem description is not really elegant at
> all. It has a few annoying exceptions to the normal rules, typical of
> what one might get in a real specification from some client.

After taking a look at other solutions, I feel like I will have to explain
myself, so I’d better do that without prompting :)

   - nothing was said about meaningful error messages, so I didn’t bother.
   - I had decided against defining constants like  
     separately; `PremiumSupplierIDs` and markup table are defined locally  
in the `calc`
     function, too. The latter two issues are fixed in the next version, as  
     may consider them to be against elegance.
   - surprisingly, all solutions use explicit comparisons to determine the  
     category. While it is okay for continuous ranges of codes, it doesn’t  
scale and
     not really elegant. Fixed as well.

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