functionaljava
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functionaljava | λ | |
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3 | 1 | |
1,585 | 855 | |
0.1% | 0.0% | |
0.0 | 3.4 | |
about 1 year ago | about 1 year ago | |
Java | Java | |
- | MIT License |
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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.
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What are some alternatives?
ncalc - Power calculator for Android. Solve some problem algebra and calculus.
Javaslang - vʌvr (formerly called Javaslang) is a non-commercial, non-profit object-functional library that runs with Java 8+. It aims to reduce the lines of code and increase code quality.
JFXShader - Allows custom effect shaders in JavaFX
jOOλ - jOOλ - The Missing Parts in Java 8 jOOλ improves the JDK libraries in areas where the Expert Group's focus was elsewhere. It adds tuple support, function support, and a lot of additional functionality around sequential Streams. The JDK 8's main efforts (default methods, lambdas, and the Stream API) were focused around maintaining backwards compatibility and implementing a functional API for parallelism.
act-pbt - Property based testing for act state machines.
Functional Java - Backport of Java 8's lambda expressions to Java 7, 6 and 5
property-based-matrix-testing-tutorial - Property-based matrix testing in Java
StreamEx - Enhancing Java Stream API
metaocaml-frex
derive4j - Java 8 annotation processor and framework for deriving algebraic data types constructors, pattern-matching, folds, optics and typeclasses.
purefun - Functional Programming library for Java
underscore-java - java port of Underscore.js