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Discussion on: The Problem with Interfaces, and how Go Fixed it

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Nick

Haskell's approach is interesting as well, and not dissimilar from Go. In Haskell you can declare an interface (but really a typeclass), and then explicitly make a type "part" of that interface. It would be like declaring a class in Java, then declare interface, then you can define an implementation of the interface's method separate from the original class.

This has the benefit of not having to know which interfaces a type follows when you declare the type, as well as having to explicitly make a type to be a part of the interface.