[Haskell-cafe] APIs (was: Unexported functions are evil)

[Graham Klyne]

At 17:20 19/05/05 -0400, ajb at spamcop.net wrote:
> > One of the best bad example is the use of boolean as arguments.
>
>Oh, yes.  That's a pet peeve of mine.  About 99% of boolean arguments
>should be meaningful two-valued enumerated types.  It's literally a
>one-liner to create such an enumerated type, so there's no excuse.

While I see your point in the case of Booleans, I note that, in other 
circumstances, not using a pre-existing data type can be sub-optimal;  cf. 
use of Maybe noted at [1].

#g
--

[1] 
http://www.ninebynine.org/Software/Learning-Haskell-Notes.html#UseStandardTypes



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Graham Klyne
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