purefun
functionaljava
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purefun | functionaljava | |
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2 | 3 | |
104 | 1,585 | |
- | 0.4% | |
9.1 | 0.0 | |
13 days ago | about 1 year ago | |
Java | Java | |
MIT License | - |
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purefun
- Is there a cats-effect or ZIO for Java? If not, then what are the blockers of having an effect system as of Java 17? What are the drawbacks of such a library in Java?
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Is there a competent Effects library (like ZIO or Monix) for Java? (IO monad)
Hi, I'm working in a library that could help you, https://github.com/tonivade/purefun.
functionaljava
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How to write this (3) Java lines in a functional style?
A few side-notes about this code: - you need some sort of "wrapper" or "container" in order to use functional methods like map/flatMap/filter/etc on some object - here I used Optionalfor testing because it's available in standard Java: Optional describes an object that may or may not be available. - A more suitable "wrapper" for this use-case could have been Try which describes the result of an execution that may succeed or fail, see vavr has a Try for example, functionaljava has Either - map transforms A -> B (would make sense for your mapToUser) whereas flatMap transforms A -> Optional (or whichever "wrapper", would make sense for your userService.save if suppose the saving operation can fail) - Here is a working example for you :) - practise exercises: 1- replace the "wrapper" Optional with List, there is almost no change of code, this now gives you the ability to process lists of users 2- import vavr and replace the "wrapper" Optional with Try, there is almost no change of code, this now gives you the ability to process operations that may fail - Enjoy functional programming, you'll find java is rather verbose and quickly gets clunky for FP, consider switching to another language
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Show HN: Pidove, an Alternative to the Java Streams API
? Sometimes passing a lambda (or other function) as an argument is a simpler approach to specialization than defining a subclass. That I think is mainstream and accepted in Java today.
There is a lot more to "functional programming" than that, such as the use of persistent collections. In some cases (such as managing the symbol table in a compiler) those methods lead to good efficiency and great simplification, in other cases they are ways to make easy problems punishingly hard.
pidove builds on top of ordinary Java Collections and doesn't push more exotic approaches as does
http://www.functionaljava.org/
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OCaml modules vs C#/Java OOP
We can simulate using type components in modules in Java by using parametrized classes, the type parameters correspond to type declarations in a ML signature. I found an example monoid definition in Java if you want to see how that looks. You can see that the "functors" are kept inside the class definition, though I don't know if it's necessary, I don't really know Java. You probably get weaker abstraction, because you can't have some monoid with an unknown carrier type, you always know the carrier type - it's just the type parameter A in Monoid.
What are some alternatives?
cyclops-react - An advanced, but easy to use, platform for writing functional applications in Java 8.
ncalc - Power calculator for Android. Solve some problem algebra and calculus.
jimmer - A revolutionary ORM framework for both java and kotlin.
JFXShader - Allows custom effect shaders in JavaFX
Paguro - Generic, Null-safe, Immutable Collections and Functional Transformations for the JVM
act-pbt - Property based testing for act state machines.
pure-todo-backend - Todo-Backend (https://www.todobackend.com/) implementation using pure stack
λ - Functional patterns for Java
Kategory - Λrrow - Functional companion to Kotlin's Standard Library
property-based-matrix-testing-tutorial - Property-based matrix testing in Java
tuples - Object-oriented Java tuples
metaocaml-frex