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: 2026-07-05 00:08:24 UTC
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https://github.com/bee-produced/bee-built

A collection of modular libraries tailor-made for Kotlin enthusiasts.

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https://github.com/team846/code-2017

Code base for our 2017 robot - Punk Monkey

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Java 8 Programs, All java features practice

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https://github.com/filiprd/monet

Online paintings retailer platform implemented in functional Scala 3

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https://github.com/aleksandarskrbic/functional-rest-api-example

Purely Functional REST API showcase application

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https://github.com/danieljharvey/website-face

Hakyll site for danieljharvey.github.io about mostly Haskell shit at the moment.

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https://github.com/deepcloudlabs/dcl235-2020-may-11

DCL-235: Effective Java Programming

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https://github.com/dragos-tudor/frontend-rendering

Rewritten React core library [functional principles].

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https://github.com/xsismadn3ss/basic_exercises_gleam

Ejercicios básicos para aprender conceptos de Gleam

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https://github.com/dirkbosman/func_with_scala

Func / Functions / Fun with Scala :)

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https://github.com/martianoff/gala-acp

Transport-neutral Agent Communication Protocol for GALA: content-hash message identity, idempotent dedup, a delivery/liveness FSM, and a generic agent-run contract — with a Claude backend.

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https://github.com/maxbarsukov-itmo/functional-programming-0

🧪λ Функциональное программирование: Лабораторная работа №0

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https://github.com/those-otter-programs/functional_interface_bean_mapper

Sampling the use of functional interfaces to create bean mappers.

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A library which calculates a bowling score, written in Haskell

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Modify object and return immutable object.

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https://github.com/milaziabchenko/custom-music-player-with-dropdown-select

Custom music player coupled with custom-made dropdown select, built with HTML, CSS, and JavaScript, combining FP and OOP approaches, and using the Web Audio API functionality

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https://github.com/bertrand31/data-structures-javascript

Collection of data structures implemented in a functional fashion in JavaScript

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https://github.com/codeconscious/unique-file-generator-fsharp

Create an arbitrary number of random, unique (by name and content) files.

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https://github.com/hamidhosen42/functional-banking-website-js

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https://github.com/didierfranc/sweetch

Switch as a function

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https://github.com/recursivelogic/haskell-bot

Haskell Discord bot for the FP Discord server

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https://github.com/constantiner/sibylla

Asynchronous Promise based functional style utilities with full TypeScript support

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https://github.com/turbaszek/ct4cs

Challenges from Category Theory for Programmers

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https://github.com/meragix/calx

⏱️ A lightweight, immutable, and fully tree-shakeable date manipulation library for Dart & Flutter. Functional-first core with zero-allocation opt-in extensions.

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https://github.com/olhkyle/fxjs-verstenden

Learn fxjs based on functional-programming concept

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https://github.com/ghillairet/frdomain-kt

Kotlin version of code from the book Functional and Reactive Domain Modeling

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https://github.com/kczulko/astar

A* algorithm

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Tetris in pure JavaScript

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Roslyn analyzer for prevention of copying certain data

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A Rule-Based discount calculating engine for a retail store. The engine reads transaction data, applies various discount rules based on the product, date, and other criteria, and writes the results back to a database.

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React app to switch images on toggle, on mouse hover or touch and by scrolling the page, made to practice React Hooks.

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https://github.com/lechindianer/fp-talk

Intro talk on functional programming

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Homework for FP ITMO course

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Persistent array data structure in JS

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

Functional Programming subject of @CMDA-TT

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Assignments from the book "Real World Haskell" (http://book.realworldhaskell.org/)

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Programming paradigms course material.

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Checkers with AI.

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Simple object to object dot notation converter in Node.js.

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Just learning how to structure ZIO programs

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🛠️ Develop and test Erlang applications effortlessly with erlang-1em, simplifying deployment and enhancing productivity for developers.

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https://github.com/wdalmut/min-max-kata-functional

Functional approach with Ramda to solve the min-max kata

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https://github.com/barbixxxa/functional-programming-language

Disciplina de Linguagem de Programação Funcional com o Professor Luis Menezes - POLI/UPE 2016.2

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https://github.com/rom-chik/kma_fp

Functional programming course on Haskell.

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https://github.com/exbotanical/heuristics

Useful heuristics, type checks, and validation helpers for JavaScript and TypeScript

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https://github.com/alinpahontu2912/racket-supermarket

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https://github.com/thehoneymad/coursera

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https://github.com/tdibacco/fp

Functional Programing constructs for Go.

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Repositório para atividades relacionadas ao paradigma funcional com o uso da linguagem Erlang.

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https://github.com/sophiecollard/variance

Simple examples to illustrate the differences between invariance, covariance and contravariance in Scala

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https://github.com/appsweet-co/debug

Makes your console logs much better

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https://github.com/jumpn/utils-composite

Composite Utilities

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https://github.com/teemu/superpowers

Sane map() for unsane Python users

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https://github.com/sourcevault/flyd-group-within

buffer flyd stream values within x millisecond

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https://github.com/rcardin/cats-effect-playground

A set of small projects to learn and to understand the cats-effect library

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https://github.com/davidlee18/minihaskell

a little, functional, and lazy language

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https://github.com/zeucxb/alura-functional-js

Curso de javascript funcional da Alura.

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https://github.com/spacesoldier/starty

a lightweight framework which helps building modular and configurable Node.js applications

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https://github.com/sgon4arov/plato

🤖 Enhance coding with Plato, a CLI-compatible AI assistant that streamlines coding tasks while integrating seamlessly with GitHub Copilot.

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https://github.com/nkcoder/byronbay

Playground for functional programming with Scala

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https://github.com/palutz/elm_playground

Playing with Elm

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https://github.com/j-christl/ocaml-utils

Some basic OCaml utility functions I will keep updating while learning functional programming

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https://github.com/rolandtritsch/haskell-aoc-2017

Taking a stab at doing the AoC in Haskell (at least Day01 :))

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https://github.com/kathleenwest/advancedconsoleapplicationi

This is a very simple windows console application that I completed for a class assignment. It is shown here to illustrate my coding style, structure, and commenting. This example is considered Level 3 – Advanced. Objectives: Events Functional Programming Custom EventArgs IList<> Interface Indexer Delegates Anonymous Methods Event Handlers

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

Homework repo for functional programming

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https://github.com/rcardin/rockthejvm-exercises

Solutions to the exercises proposed during the courses on RockTheJvm site

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https://github.com/th3n0m4d/functional-programming-meetup

Basic functional programming ideas illustrated with (the awesome) Ramda library.

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https://github.com/icepanorama/learning-sml

A collection of small programs written as I'm refamiliarizing myself with Standard ML.

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https://github.com/mahi97/numex-lang

~ The pure functional Interpreter for NUMEX Language Based on Racket

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https://github.com/edwyng/ldp-haskell-draft-beers

Programa diseñado con programación funcional que permita determinar cuántos litros de cerveza deben agregarse entre los barriles para servir exactamente n vasos de cerveza desde cualquiera de las salidas.

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https://github.com/habu-kagumba/functional-programming-js

Javascript applications with FP

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https://github.com/zlovtnik/frontend

A TypeScript/Bun/React frontend application for the Actix Web REST API backend with JWT authentication, multi-tenant support, and comprehensive functional programming patterns.

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