I don't understand this trend of hiding data in OOP, data is what computation is all about?!
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Data invariants.
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This stuff is valuable in Haskell too. It's Abstract Data Types. Here's some slides I did about the topic in Haskell liamoc.net/adts.pdf
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That's a really nice presentation! I like how you explain stuff using Haskell, type signatures, and diagrams!