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: 2025-10-21 00:12:15 UTC
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https://github.com/italomaia/lua_fun

Functional programming library for lua lang.

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Last synced: 11 Aug 2025

https://github.com/luhring/funky

A Go (golang) linter that finds mutations.

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https://github.com/duboviy/funpy

:snake: A sandbox for trying out functional programming in Python

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https://github.com/vickumar1981/functional_python

Functional Programming in Python: PyCon 2022 Jupyter notebook

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https://github.com/0xleif/closure

Define and chain Closures with Inputs and Outputs

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https://github.com/kevin-lee/just-fp

A small functional programming library

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https://github.com/mtumilowicz/scala-zio2-fs2-refined-newtype-workshop

Introduction into fs2, newtype and refined types.

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https://github.com/causaly/array-fp-utils

Array utilities for functional programming in TypeScript.

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https://github.com/owainlewis/hof

Higher order functions for Golang

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https://github.com/bohdanmoroziuk/code-snippets

This is my personal knowledge-base. Here you'll find code-snippets, technical documentation, and command reference for various tools, and technologies.

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https://github.com/yehzhang/purescript-materialize

Materialize bindings à la purescript-smolder.

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https://github.com/coderitual/round-royale

My entry for the js13k 2017 game jam

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https://github.com/xavkearney/fsharp-arm-emulator

ARM Assembly Language Emulator implemented in F#

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https://github.com/huanghaiyang/todash.dart

lodash implement by dart

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https://github.com/khalyomede/monad

Maybe, Option and Result monads for PHP.

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https://github.com/mauricechouam/word-guess-game

Guess the correct word and earn a win point!

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https://github.com/lysxia/test-fun

Representation of higher-order functions for property testing

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https://github.com/jderochervlk/fp-ts-remote-data

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https://github.com/stewsquared/pe-speedrun

2020 Project Euler 1-100 Speedrun in Scala #ProjectEuler100

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https://github.com/leostera/zazen

:pray: sit, breathe, code.

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https://github.com/acorrenson/pym-s

Python with a sweet functionnal taste

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https://github.com/nedal-esrar/string-calculator-fsharp

Simple Calculator with Addition Functionality using F#

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https://github.com/mthaler/order-taking

Order taking example from the book "Domain Modeling Made Functional" converted to Kotlin

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https://github.com/masipcat/invars

Single assignment variables in Python

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https://github.com/tarsisexistence/fuzion

shortcut fu⚡️ion for TypeScript

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https://github.com/yornaath/fp-ts-http

Opinionated, strongly typed http middleware library using fp-ts fp-ts-routing and io-ts for decoding of io

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https://github.com/sloanelybutsurely/advent-of-code

🎄 Solutions to Advent of Code problems in whatever language I feel like using (mirror)

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https://github.com/markomanninen/calchylus

Lambda Calculus with Hy - Docs: http://calchylus.readthedocs.io/

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https://github.com/gingerhot/qqlog-haskellchina

QQ Group Log of HaskellChina User Group

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https://github.com/flintinatux/squirrel

A nimble functional library for Lua.

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https://github.com/mallozup/blacktango

console client for software maintainers

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https://github.com/mooerslab/emacsatx4may2022

Brief introduction to functional programming in Emacs Lisp

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https://github.com/denismurphy/pythonic

Selection of naive code snippets and examples that I compiled while learning Python.

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https://github.com/jakxz/functional-or

functional OR in js

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https://github.com/mkulke/hyper-ts-playground

A typescript express app with monadic middlewares and typestates.

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https://github.com/norbcodes/ncapybaralib

A small library with a bunch of functions and thingies I made for fun.

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https://github.com/ace411/bingo-functional-repl

A simple REPL for the bingo-functional library.

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https://github.com/kourouklides/fsharp-examples

Example code in .NET F#

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https://github.com/zarinfam/java-type-classes-sample

This is a sample project to describe and implement type classes functional programming concept in Java. You can find complete article in this link:

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https://github.com/keera-studios/enpuzzled

The new iOS & Android brain game - How clever are you?

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https://github.com/ethanabrooks/dollar-lambda

An argument parsing library based on function first principles

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https://github.com/francomelandri/intesta

Integration test api

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https://github.com/georgesittas/monads-presentation

Presentation about the role of monads in Functional Programming

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https://github.com/patrimart/ngix-store

IxJS augmented state management for Angular applications, inspired by Redux and built upon @ngrx.

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https://github.com/halogenandtoast/mirin

A tiny redirection server in Spock backed by MySQL.

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https://github.com/ilyasyoy/python-streamer

Simple lazy python Stream API-like wrapper.

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https://github.com/grigorii-horos/picolang

Minimal interpreter of functional language, writen in JavaScript

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https://github.com/baileympearson/iterable-ts

A Typescript library providing flexible and composable iterator operations.

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https://github.com/samyam81/anonymous-functions

A lambda expression in Java is a concise way to define an anonymous function that can be used as a method parameter or assigned to a variable.

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https://github.com/david-fernando/noloopfor

JavaScript library for making functional loops

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https://github.com/numq/webrtc-backend

Random video chat backend written in functional programming paradigm

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https://github.com/kioviensis/fuzion

shortcut fu⚡️ion for TypeScript

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https://github.com/sczyh30/samsara-aquarius

:zap:Samsara Aquarius - a technology sharing web application written in Scala

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https://github.com/romalev/reactive-spring-web-flux-service

Simple POC of nonblocking REST service based on spring-web-flux which is backed by Netty.

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https://github.com/imteekay/talks

Tech Talks - Striving to share knowledge

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https://github.com/lukechu10/nopo

An interpreted functional programming language

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https://github.com/inhibitor1217/lemma

(WIP) i18n web service

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https://github.com/francomelandri/pipeline-fp

pipeline pattern using functional programming approach

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https://github.com/jabrena/streams-by-example

Learning Java 8 Stream API by examples

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https://github.com/rubenjgarcia/commons-functional

A collection of Functional helpers for Java 8

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https://github.com/brauliov/logica-y-programacion

Prácticas de la asignatura de Lógica y Programación del curso 2015-2016

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https://github.com/raviqqe/stg

STG Machine in Go

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https://github.com/sciexp/python-nix-template

❄️ (om)nix template for python workspace monorepos +/- pyo3 extension modules with uv2nix and flake-parts 🐍

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https://github.com/glebec/advent-of-code-2019

Advent of Code 2019 Solutions in Haskell

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https://github.com/laserdisc-io/stream-it

An integration test library for end-to-end testing of streaming applications

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https://github.com/tatsuya6502/nikkei-linux-fp

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https://github.com/mallozup/doghub

a functional stale bot for Github Issue and PRs.

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https://github.com/tjmaynes/shopping-cart-service-py

Sample shopping cart CRUD service using Python3/FastAPI and Kubernetes

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https://github.com/polyvariant/learn-scala

Reference learning material for Scala

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https://github.com/noyzys/nautchkafe-vanish

A simple bukkit/spigot plugin 1.21 :: vanish moderation system.

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https://github.com/mtumilowicz/scala-http4s-zio-doobie-workshop

Introduction to pure functional programming using effects with zio, http4s, fs2 and doobie.

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https://github.com/jaalonso/exercitium

Ejercicios de programación funcional con Haskell

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https://github.com/constantiner/fun-ctional

The library brings most of the familiar functional techniques (like functional composition) to asynchronous world with shining Promises

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https://github.com/JonasMuehlmann/optional.go

optional.go is a simple and generic wrapper around a value and a presence flag inspired by C++'s std::optional

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https://github.com/nengo/nengo-gyrus

Recursively generate large-scale Nengo models using NumPy semantics.

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https://github.com/crowdhailer/eyg

Explicit concurrency for intelligible parallel programing.

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https://github.com/winston0410/ramda-dom-utilities

An utility library that enables currying and piping for DOM manipulation functions with Ramda

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https://github.com/sylphlab/media-curator

Intelligently organizes and deduplicates large digital photo and video collections using metadata and content analysis (perceptual hashing, LSH).

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https://github.com/connor-makowski/pamda

Functional programming for python

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https://github.com/mrhrifat/javascript

JavaScript is the most popular Programming language in the world. Over 97% of websites use JavaScript on the client side for web page behavior, often incorporating third-party libraries.

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https://github.com/wanderhuang/basic-programming-knowledge

从零开始

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https://github.com/eloyekunle/haskell_snippets

Useful snippets and algorithms in Haskell

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https://github.com/kylecorbelli/typescript-maybe

A TypeScript Maybe Type and Module

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https://github.com/segfaultax/pyeither

An implementation of Data.Either from Haskell in Python

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https://github.com/matthewsecrist/fxnk

A functional programming library for Elixir inspired by Ramda.

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https://github.com/mrcaidev/design-patterns

Design patterns written in TypeScript, under both OOP and FP paradigm.

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https://github.com/badeend/result

For failures that are not exceptional: `Result<T,E>` for C#.

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https://github.com/danisancas/tallerscalapeum

Temario de talleres de Scala impartidos para la comunidad PEUM

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https://github.com/drlordbasil/experimental_python_agents

A collection of Python functions that leverage Large Language Models (LLMs) to replace traditional programming functions and libraries. The goal is to create a library where every operation is handled by LLM responses rather than hardcoded functions.

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