Functional enables “predictable” code, and Reactive enables “separated” code. Cycle.js apps are made of pure functions, which means you know they only take inputs and generate predictable outputs, without performing any I/O effects. The building blocks are reactive streams from libraries like xstream, RxJS or Most.js, which greatly simplify code related to events, asynchrony, and errors.

Cyclejs - A functional and reactive JavaScript framework for predictable code

BuckleScript leverages the existing OCaml compiler and toolchain to produce JavaScript that closely resembles the original OCaml. It isn't a new language. It simply takes OCaml, a fast, pragmatic and typed language, and makes it compile to clean, readable and performant JavaScript code. This allows the users to write in an industrial-strength language while using the existing, familiar JavaScript tools (npm/yarn, bundlers, minifiers, devtools, etc.) and accessing the vast ecosystem from both JavaScript and OCaml.

Bucklescript - A backend for the OCaml compiler which emits JavaScript.

Vavr is an object-functional language extension to Java 8, which aims to reduce the lines of code and increase code quality. It provides persistent collections, functional abstractions for error handling, concurrent programming, pattern matching and much more.
 
Vavr fuses the power of object-oriented programming with the elegance and robustness of functional programming. The most interesting part is a feature-rich, persistent collection library that smoothly integrates with Java's standard collections.

Vavr is an object-functional language extension to Java 8, which aims to reduce the lines of code and increase code quality. It provides persistent collections, functional abstractions for error handling, concurrent programming, pattern matching and much more.

Vavr - Object-functional language extension to Java

ZIO is a zero-dependency Scala library for asynchronous and concurrent programming. It is powered by highly-scalable, non-blocking fibers that never waste or leak resources, ZIO lets you build scalable, resilient, and reactive applications that meet the needs of your business.
 
<ul>
<li>High-performance. Build scalable applications with 100x the performance of Scala's <code>Future</code>.</li>
<li>Type-safe. Use the full power of the Scala compiler to catch bugs at compile time.</li>
<li>Concurrent. Easily build concurrent apps without deadlocks, race conditions, or complexity.</li>
<li>Asynchronous. Write sequential code that looks the same whether it's asynchronous or synchronous.</li>
<li>Resource-safe. Build apps that never leak resources (including threads!), even when they fail.</li>
<li>Testable. Inject test services into your app for fast, deterministic, and type-safe testing.</li>
<li>Resilient. Build apps that never lose errors, and which respond to failure locally and flexibly.</li>
<li>Functional. Rapidly compose solutions to complex problems from simple building blocks.</li>
</ul>

ZIO is a zero-dependency Scala library for asynchronous and concurrent programming. It is powered by highly-scalable, non-blocking fibers that never waste or leak resources, ZIO lets you build scalable, resilient, and reactive applications that meet the needs of your business.

Zio - A type-safe, composable library for async and concurrent programming in Scala 

Functional Java is an open source library facilitating functional programming in Java. The library implements numerous basic and advanced programming abstractions that assist composition oriented development. Functional Java also serves as a platform for learning functional programming concepts by introducing these concepts using a familiar language.


Functional java - A Library for Functional Programming in Java

Eta is a pure, lazy, strongly typed functional programming language on the JVM. It is a dialect of Haskell on the JVM. It is pure by default which means that calling a function with the same arguments will yield the same results every time. It is lazy by default which means that data stays in unevaluated state until a function needs to peek inside.
 
A strong type system gives you the power to tell the compiler more information about your code. Eta uses type inference so that it can understand your intent even if you don't explicity specify the types of your expressions
 
Eta runs on the JVM and it is designed to be compatable with Java. This means that you can reuse Java libraries in Eta projects and use Eta modules in Java. Eta's immutability makes concurrency a pleasure to work with. Eta offers a wide range of strategies for handling concurrency including the Par monad for fine-grained parallelism and Software Transactional Memory for reusable concurrent programming without locks.

Eta is a pure, lazy, strongly typed functional programming language on the JVM. It is a dialect of Haskell on the JVM. It is pure by default which means that calling a function with the same arguments will yield the same results every time. It is lazy by default which means that data stays in unevaluated state until a function needs to peek inside.

Eta - A powerful language for building scalable systems on the JVM

A small collection of Stream utilities for Java 8. Protonpack provides takeWhile, takeUntil, skipWhile, skipUntil, zip, zipWithIndex, unfold, MapStream, aggregate, Streamable, unique collector.

Protonpack - Stream utilities for Java 8

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Cyclejs - A functional and reactive JavaScript framework for predictable code

Bucklescript - A backend for the OCaml compiler which emits JavaScript.

Vavr - Object-functional language extension to Java

Zio - A type-safe, composable library for async and concurrent programming in Scala

Functional java - A Library for Functional Programming in Java

Eta - A powerful language for building scalable systems on the JVM

Protonpack - Stream utilities for Java 8

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Cyclejs - A functional and reactive JavaScript framework for predictable code

Bucklescript - A backend for the OCaml compiler which emits JavaScript.

Vavr - Object-functional language extension to Java

Zio - A type-safe, composable library for async and concurrent programming in Scala

Functional java - A Library for Functional Programming in Java

Eta - A powerful language for building scalable systems on the JVM

Protonpack - Stream utilities for Java 8

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