Kategory Alternatives

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Reviews and mentions

Posts with mentions or reviews of Kategory. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2021-11-22.
  • FP Architecture
    2 projects | dev.to | 22 Nov 2021
  • What are the best library options for Functional Programming in Java?
    1 project | reddit.com/r/learnjava | 20 Nov 2021
    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.
  • ¿Es Validated un Applicative?
    5 projects | dev.to | 19 Nov 2021
  • Either vs Try (vs Result)
    5 projects | dev.to | 16 Nov 2021
  • Is there any KEEP for adding support to something like F# computation expressions to Kotlin?
    1 project | reddit.com/r/Kotlin | 15 Oct 2021
    There is also https://arrow-kt.io/
  • Java is the best
    5 projects | reddit.com/r/ProgrammerHumor | 30 Aug 2021
    Nothing like cats or ZIO for Kotlin. I do hope I don't have to explain why Kotlin Arrow is not a good replacement.
  • Modelando Ausencia con Kotlin y Arrow
    2 projects | dev.to | 8 Jul 2021
  • Is there a competent Effects library (like ZIO or Monix) for Java? (IO monad)
    3 projects | reddit.com/r/scala | 27 May 2021
    The Arrow library, for the Kotlin language, draws notably from major functional libraries and effect libraries from Scala, such as cats, cats-effect, fs2, and monix.
  • DoorDash: Migrating From Python to Kotlin for Our Backend Services
    13 projects | reddit.com/r/programming | 5 May 2021
    If you need to handle stuff like that, use Arrow.
  • What are the other use cases of the Either monad, other than error handling?
    2 projects | reddit.com/r/functionalprogramming | 3 May 2021
    That just gave me another reason to try to create my own version of the Arrow library in Kotlin! I didn't really like the names given to some of the types there. 😅 This can also serve as a way for me to learn Optics and the FX side of the library too! (And maybe I can even try my hand at implementing persistent data structures!)
  • Your own custom Spring Data repository
    3 projects | dev.to | 11 Apr 2021
    -- Arrow
  • Kotlin for someone who learned in this order: assembler, C++, scheme, C#, Java, JS
    1 project | reddit.com/r/Kotlin | 28 Mar 2021
    Yes, Kotlin does not have an option monad, and that is because static nullability is integrated into the language. Having an Option / Optional construct in Kotlin is therefore generally agreed to be superfluous. For example: Λrrow, the state-of-the-art FP framework for Kotlin discontinued their Option monad because it has shown that it is not useful when you already have nullable types. Kotlin offers a lot of features to deal with nullability: safe calls (?.), non-null assertions (!!), the elvis operator (:?) or the fact that nullable types are supertypes of their non-nullable variants. Those are all things you could not achieve with Optional. From my experience, there's always a way to combine the above language features to solve every problem in an elegant matter. So what's the problem with the code in the article? As always it is Java interop. The author coerced this example to fit with his argumentation, but you usually don't use Integer.parseInt() in Kotlin. That one is straight from the Java stdlib. In Kotlin, we have .toInt(), which is an extension function, which means you can utilize safe calls with it:
  • Generalizing over Generics in Rust (Part 1) - AKA Higher Kinded Types in Rust
    3 projects | reddit.com/r/rust | 17 Feb 2021
    It's similar to how Arrow-KT implemented HKTs on top of Kotlin's type system. You have to pass concrete witnesses around there, though, which you don't have to in Rust. Rust's compiler can use traits to figure out which function to call (Kotlin lacked traits, but they're implementing generic interfaces now, something that might end up being quite similar) so you can forgo witnesses.


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arrow-kt/arrow is an open source project licensed under GNU General Public License v3.0 or later which is an OSI approved license.

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