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

Richard O'Keefe ok at cs.otago.ac.nz
Mon May 28 04:07:09 CEST 2012

On 26/05/2012, at 4:16 AM, David Turner wrote:
> I don't. I think the trouble is that classes don't add value in exercises of this size.

This was the key point, I think.
In this example, there wasn't any significant behaviour that could be moved
to superclasses.  For that matter, whether a supplier is plain, preferred,
or problematic is, one hopes, not a *permanent* property of a supplier.

Sometimes higher-order functions can substitute for classes.

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