Top 18 Java Functional programming Projects

• Javaslang

  8 5,528 4.0 Java

  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.

  

• groovy

  22 5,089 9.8 Java

  Apache Groovy: A powerful multi-faceted programming language for the JVM platform

  

Project mention: Groovy 🎷 Cheat Sheet - 01 Say "Hello" from Groovy | dev.to | 2024-03-07

This time, I visited Groovy. Given my biased first impression about Java and the JVM, I wasn't too exited! But I couldn't have been more wrong! 😁

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• Functional Java

  1 3,538 0.0 Java

  Backport of Java 8's lambda expressions to Java 7, 6 and 5

• StreamEx

  2 2,147 6.4 Java

  Enhancing Java Stream API

• jOOλ

  2 2,055 1.7 Java

  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.

  

• functionaljava

  3 1,585 0.0 Java

  Functional programming in Java

  

• cyclops-react

  2 1,296 0.0 Java

  An advanced, but easy to use, platform for writing functional applications in Java 8.

  

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• λ

  1 855 3.4 Java

  Functional patterns for Java

  

• derive4j

  0 560 0.0 Java

  Java 8 annotation processor and framework for deriving algebraic data types constructors, pattern-matching, folds, optics and typeclasses.

  

• underscore-java

  2 516 8.7 Java

  java port of Underscore.js

• protonpack

  0 478 0.0 Java

  Stream utilities for Java 8

• throwing-function

  2 358 3.0 Java

  Checked Exceptions-enabled Java 8+ functional interfaces + adapters

• Faux Pas

  0 128 1.6 Java

  A library that simplifies error handling for Functional Programming in Java

  

• purefun

  2 104 9.1 Java

  Functional Programming library for Java

• noexception

  1 91 4.3 Java

  Java library for handling exceptions in concise, unified, and architecturally clean way.

Project mention: Unchecked Java: Say Goodbye to Checked Exceptions Forever | news.ycombinator.com | 2023-07-13

Putting aside the discussions about the necessity of checked exceptions (to which I feel unqualified to express my opinion), I believe the approach used by the OP article is not the best one:

- It requires modifying compiler arguments and putting some file in the local classpath! That's really not Java-ic. Is it?

- It is not transparent in the code. You cannot infer by looking at the source code that something has changed.

Since some time ago I use the NoException library[0] in my Java projects which achieves the same goal but without the above-mentioned issues. It can also be used to mimic Scala's Try construct.

[0] https://github.com/robertvazan/noexception

• fuzion

  1 45 9.9 Java

  The Fuzion Language Implementation (by tokiwa-software)

  

• expressible

  1 27 4.0 Java

  Utility library dedicated for functional & non-functional codebases to simplify modelling of success and failure responses for Java/Kotlin 🔀

• roman-arabic-calculator

  1 0 1.8 Java

  This code is a proof of concept. The calculator can work with both Arabic (1,2,3,4,5 ...) and Roman (I, II, III, IV, V ...) numbers.

• SaaSHub

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Java Functional programming related posts

• Janet for Mortals
  6 projects | news.ycombinator.com | 31 Mar 2023
• Underscore-java
  1 project | /r/java_projects | 29 Jan 2023
• To use Java Collections or another collections library? (Eclipse, Guava, Apache)
  3 projects | /r/java | 27 Jan 2023
• How can I build a FL stack using Apache Groovy and Apache Wayang?
  1 project | /r/ApacheWayang | 18 Jan 2023
• Technology to verify that program binaries match a given source code?
  2 projects | /r/cryptography | 5 Jan 2023
• Can I use Scala if my teammates are using Java in a project?
  1 project | /r/scala | 9 Dec 2022
• What’s so great about functional programming anyway?
  8 projects | news.ycombinator.com | 16 Nov 2022
• A note from our sponsor - WorkOS
  workos.com | 25 Apr 2024

  The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning. Learn more →

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