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Things that are things, but not other things

Understanding the exact properties that disqualify a data type from being an instance of a given abstraction turns out to be surprisingly helpful

Nicolas Rinaudo
Nicolas writes code for JPMorgan, where we use Scala to make some very complicated things seem very simple.
About This Talk

Abstractions such as functor, monads... are often explained by example, which I think is only half of what's needed to build a solid intuition. The other half is counter-examples: things that *aren't* things. This talk intends to fill that void, by going through the list of common abstractions and showing types that are, say, a functor, but not an applicative. While this may sound more like a toy than something useful, understanding the exact properties that disqualify a data type from being an instance of a given abstraction turns out to be surprisingly helpful, and have certainly allowed me to go further in my study of such things.

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