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"Avoid typeclass abuse" seems like an oddly specific choice to include in a short post about introductory haskell, but it's true

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I wrote up some advice I often give for beginning Haskell programmers: haskellforall.com/2017/10/advice

I made this mistake early on a lot: I thought Java interfaces mapped to Haskell classes, but really more often they map to Haskell records.

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Typeclasses map to Haskell records too! Just with extra magic!