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I am wondering what the functional programming ecosystem looks like for Java. I am an experienced Haskell programmer, so I am not looking to learn the fundamentals of FP, I am just looking for the easiest way to get certain things like an Either type, a Maybe type, Monoids, optics would be nice but not essential, and so on. I checked out the Functional Programming in Java and Modern Java in Action books and it looks to me (but I may have just missed mentions of libraries) that they lean into teaching FP ideas from first principles, whereas I'm not trying to learn the ideas, I am just looking for a good library. What I'm looking for basically is the Kotlin Arrow library; if I was working in Kotlin I would just use that and be happy. Obviously interoperability between Kotlin and Java exists though, so would just importing Arrow and using it from Java be a pragmatic solution or would it cause a lot of annoyances? The code I'm writing is not going to be used for anything, so incurring Kotlin as a dependency (at least I think that's how it works, right?) is not an issue. I am just looking for a good library to use. Thank you.
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