[Haskell-cafe] programming style...and type classes...

[Nicholls, Mark]

I’m nervous of the statement “used properly”…it’s a bit tautological, and the inference is often used the wrong way around…i.e. if it doesn’t work you didn’t use it properly….and if it did…then you did!

i.e. the logic goes.
Creating an open data abstraction is not a “proper” usage?
But not knowing future extensions requirements is a reality?
So having a language where data abstraction are open by default (unless you WANT to close them) is an attractive objective?
Typeclasses provide this?
Eureka!
Becomes DISASTER?

So is the objection is really empirical ?…i.e. typeclasses will cause you problems IF you work like this (and you don’t know what you’re doing)?

Once you know where the problems are…best steer clear….once you know the pitfalls, you can use them “properly” (successfully)?

(ironically the process of finding the problems IS not using them properly!...but that’s life I think).



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