Functional programming

In computer science, functional programming is a programming paradigm where programs are constructed by applying and composing functions. It is a declarative programming paradigm in which function definitions are trees of expressions that map values to other values, rather than a sequence of imperative statements which update the running state of the program.

GitHub: https://github.com/topics/functional-programming
Wikipedia: https://en.wikipedia.org/wiki/Functional_programming
Related Topics: oop, declarative-programming, procedural-programming, event-driven-programming,
Last updated: 2026-06-16 00:11:53 UTC
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https://github.com/kevin-lee/j8plus

Library containing useful tools for Java 8

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https://github.com/siraben/fp-notes

Notes on Functional Programming and related topics

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https://github.com/mpkocher/functional-programming-techniques-in-python

Exploring functional centric designs and patterns in Python

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https://github.com/phenax/enum-fp

Functional Enum type / Sum type for javascript with simple pattern matching

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https://github.com/dhil/phd-dissertation

A summary of my activities during the past four years

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https://github.com/playq/d4s

Dynamo DB Database Done Scala-way

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https://github.com/fluture-js/fluture-express

:steam_locomotive: Create Express middleware using Futures

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https://github.com/nikdon/telepooz

Functional Telegram Bot API wrapper for Scala on top of akka, circe, cats, and shapeless

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https://github.com/howprogrammingworks/closure

Function closures and storing data in function scope

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Non-trivial, real use case demo of a hierarchical state machine library with cyclejs

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Remove all the cookies on the tray! - The Haskell iOS & Android board game

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https://github.com/HowProgrammingWorks/Closure

Function closures and storing data in function scope

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https://github.com/rvikmanis/redux-fp

Functional programming helpers for Redux.

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https://github.com/flyfish30/zig-cats

A category and functional programing library for Zig language

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https://github.com/adityaathalye/usermanager-first-principles

A "from first principles" variant of "usermanager-example", the tutorial Clojure web application by Sean Corfield.

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https://github.com/quadrupleslap/union-js

🏷️ Tagged unions for vanilla JavaScript!

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https://github.com/fp4ts/fp4ts

Zero-dependency, purely functional library for effectful programming in Typescript

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Functional Programming From Scratch 日本語版

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Concise anonymous functions for Emacs Lisp

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https://github.com/geirolz/cats-xml

A functional library to work with XML in Scala using Cats.

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https://github.com/loreanvictor/quel

Reactive Expressions for JavaScript

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https://github.com/fwcd/curry-language-server

IDE support for the functional logic programming language Curry

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https://github.com/cfhammill/lenses

Elegant Data Manipulation with Lenses

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https://github.com/moonad/Moonad

Moonad: a p2p academic journal, or a social network for code?

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Slides and video recording for my "Intro to Cats-Effect" talk

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https://github.com/madlib-lang/madlib

Madlib language compiler

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https://github.com/mystpi/act

🎬 Compose stateful actions to simulate mutable state

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Python functional programming

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https://github.com/arrow-kt/arrow-integrations

Λrrow Integrations is part of Λrrow, a functional companion to Kotlin's Standard Library

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https://github.com/sliptype/vue-pure

⛱ An example of managing state using Purescript in a Vue app

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https://github.com/transeptorlabs/transeptor-bundler

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https://github.com/mchakravarty/goalsapp

Track periodic goals — a sample iPhone app

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https://github.com/jackfoxy/fsregex

Composable regular expressions for F#

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https://github.com/sandromaglione/fpdart_riverpod

Complete guide on how to build a safe, maintainable, and testable flutter app using fpdart and riverpod

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https://github.com/flintinatux/tinyfunk

The tiniest of functional libraries

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https://github.com/sritchie/scala-rl

Functional Reinforcement Learning in Scala.

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https://github.com/tylors/45

A Functional, monadic test-runner

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A language about virtual kontinuation

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https://github.com/kwan3854/unity-nope

The fastest functional programming library for Unity – the easiest and quickest way to handle exceptions and null values.

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https://github.com/augusto11cb/java-studies

Repository of my learning notes and programs for fundamental & important concepts of Java programming and development.

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A language about virtual kontinuation

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Functional Reinforcement Learning in Scala.

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https://github.com/avdosev/either_dart

Either class for Dart or Flutter projects.

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https://github.com/keyvan-m-sadeghi/nancy

How JavaScript Promise Works

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Tiny vdom app framework. Pure Redux. No boilerplate.

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https://github.com/code-y/redux-fluent

A Practical and Functional Redux Utility

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https://github.com/cu1ch3n/type-inference-zoo

🦖 Implementations of various type inference algorithms. Online interactive playground is available at https://zoo.cuichen.cc/

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https://github.com/codelytv/php-finder_refactoring-kata

🐘🔍Incomprehensible Finder Refactoring Kata port for PHP

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https://github.com/crubier/infinistack

Infinite recursion in JS without stack overflow errors, based on magic 🎩✨🐇

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https://armcn.github.io/quickcheck/

Property Based Testing in R

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https://github.com/loophp/fpt

Functional programming toolbox for PHP.

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https://github.com/nshkrdotcom/claude_agent_sdk

An Elixir SDK for Claude Code - provides programmatic access to Claude Code CLI with streaming message processing

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https://github.com/healeycodes/golfcart

⛳ A minimal programming language inspired by Ink, JavaScript, and Python.

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https://github.com/armcn/quickcheck

Property Based Testing in R

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https://github.com/2bigo/nancy

How JavaScript Promise Works

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https://github.com/fizzyelt/functional-programming

帶你探索 functional programming

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https://github.com/facile-it/mutoid

Reactive library for data fetching, caching, state management

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https://github.com/svenruppert/functional-reactive-lib

A core java lib for the functional reactive coding ... JDK only

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https://github.com/nshkrdotcom/gemini_ex

Elixir Interface / Adapter for Google Gemini LLM, for both AI Studio and Vertex AI

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https://github.com/ctlst-tech/c-atom

Model-based driven real-time embedded software framework for safety-critical and mission-critical application

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https://github.com/iheartradio/thomas

Another A/B test library

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https://github.com/aashari/boilerplate-lambda-typescript

AWS Lambda project template with TypeScript and Terraform. Features serverless architecture, automated deployment pipelines, testing frameworks, local development environment, AWS SDK integration, and standardized project structure for scalable Lambda functions.

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https://github.com/bizmonger/nikeza

Platform for associating content to their providers.

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https://github.com/risingfisan/programacao-funcional

Contém todas as fichas relativas à cadeira de Programação Funcional, do ano letivo 2018/19, e resoluções de testes e exames de anos anteriores.

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https://github.com/47degrees/functional-error-handling

Functional Error Handling

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https://github.com/rahul-barick/serverless-aws-lambda-node-postgres

Serverless AWS Lambda with Node.js,Postgres Rest API with Sequelize.

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https://github.com/75lb/typical

Isomorphic, functional type-checking for Javascript

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https://github.com/phenax/pipey

Create pipeline operator ready functions by converting instance methods's to context-free functions

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https://github.com/iitalics/opal

Simple and powerful programming language with type inference

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https://github.com/pointfreeco/swift-quickcheck

🏁 An implementation of QuickCheck in Swift.

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https://github.com/nitrodevs/csharpfunctionalextensions.fluentassertions

A small set of extensions to make test assertions more fluent when using CSharpFunctionalExtensions! Wow!

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https://github.com/federico-paolillo/memoize

Memoize C# functions with ease.

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https://github.com/ghurtchu/diary

:pencil2::clipboard: JWT auth based persistent (MongoDB) RESTful API for managing notes along with searching and sorting capabilities.

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https://github.com/Darkhogg/polyethylene

easy manipulation of iterables and async itrerables

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https://github.com/csabahruska/manual-stg-experiment

Manually constructed STG programs compiled with the standard GHC codegen backend.

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https://github.com/obfusk/koneko

koneko - a concatenative not-quite-lisp for kittens

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https://github.com/calvinlfer/es-cqrs-shopping-cart

A resilient and scalable shopping cart system designed using Event Sourcing (ES) and Command Query Responsibility Segregation (CQRS)

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https://github.com/anssihalmeaho/funl

FunL programming language

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https://github.com/ioleo/zio-by-example

Source code for "ZIO by example" blog post.

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https://github.com/identinet/sanctuary-cheat-sheet

Functional programming cheat sheet for https://sanctuary.js.org/

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https://github.com/arichiardi/fonda

An async pipeline approach to functional core - imperative shell.

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https://github.com/cando/Algar

Algebraic structures, higher-kinded types and other category theory bad ideas

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https://github.com/xodio/hm-parser

A parser for Hidnley Milner notations

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https://github.com/ritesh404/kudojs

A utility library to write code in functional programming style in Javascript

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https://github.com/mitranim/emerge

Use plain JS types as immutable data, with efficient merging and memory sharing

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https://github.com/galad/csharpdiscriminatedunion

A library for generating discriminated union types in C#

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https://github.com/keera-studios/haskell-titan

Testing Infrastructure for Temporal AbstractioNs

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:ambulance: Error-handling for redux-saga.

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https://github.com/ken-okabe/vanfs

🍦 VanFS: 1:1 bindings from F# to 🍦VanJS (an ultra-lightweight , zero-dependency , and unopinionated Reactive UI framework based on pure vanilla JavaScript and DOM without React/JSX) + WebComponents + micro FRP

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