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: 2026-06-25 00:08:15 UTC
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https://github.com/foxfriends/raiser

Raise multiple errors without throwing

error-handling fantasy-land functional-programming monad

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https://github.com/pmuens/htdp

How to Design Programs

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https://github.com/baberrehman/haskell-for-great-good

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https://github.com/asarkar/fp-scala

Functional Programming in Scala

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https://github.com/himal28924/pcl

PCL course from VIA University

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https://github.com/g0mb4/funcpp

Functional C++, it's fun.

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https://github.com/mikejeuga/fonctionnelle

Just some files while I am learning

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https://github.com/i7t5/pagerank

A Scala implementation of Google's classic PageRank algorithms for COMP 424 Parallel Computing, Spring 2025

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https://github.com/sanghviharshit/config-parser-sml

Class Project - Implementation of a configuration parser using Standard ML of NJ (SML).

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https://github.com/exbotanical/turnstile

A sandboxed continuous integration server for minimal effort build tasks

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https://github.com/appthrust/fcr

A functional programming toolkit for Kubernetes development, providing functional wrappers for controller-runtime packages with type-safe, composable operations

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https://github.com/dotoscat/pyfunstream

Allow to chain functions with the | operator through streams

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

🗂️ Collection of immutable data structures implemented in idiomatic, functional Scala. Some well-known, some homemade

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https://github.com/andreea-sindrilaru/fp-exercises

Functional programming assignments done in Elm

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https://github.com/lmarzocchetti/advent-of-code-2023-haskell

Advent of Code 2023

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https://github.com/vijayksingh/functional-programming-1

Functional Programming Lesson 1

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https://github.com/jakubriegel/geffe-generator

Functional style implemented Geffe cryptographic stream generator

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https://github.com/vit0rr/lexical_analysis

Lexical analysis interpreter step in OCaml

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A Webapp to keep a track of your finances

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https://github.com/alanvivona/code-samples

Playground repository containing examples, snippets & experiments: CycleJS, RxJS, ReactJS, NodeJS, MongoDB, D3, functional programming, machine learning, Python, etc.D

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https://github.com/sinkaszab/limbda

Functional programming helper library.

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https://github.com/htet-ahkar/functional-programming-web-village-voyage-

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https://github.com/mryossu/fallibledemo

A better way of handling exceptions in C# applications

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https://github.com/jackdbd/pegthing

My implementation of the Peg Thing game in Clojure for the Brave and True

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https://github.com/franciscomsm/fp-in-js

Functional programming in JS - talk assets

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

Rewritten React redux library [functional principles].

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https://github.com/julgitt/prolog-implementation-in-ocaml

Prolog parser, lexer and interpreter in Ocaml

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https://github.com/james-p-d/lambda

A simple Lambda expression interpreter in Java

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https://github.com/adversing/monoid.scala

Scala-based Haskell monoid implementation

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https://github.com/zyzbroker/elm-revisit

Explain ELM architecture and its selling point and weakness

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https://github.com/powerunit/powerunit-extensions-exceptions

Objects to support checked exception in lambda

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https://github.com/mhenderson/squarelimit

Escher's Square Limit in R with funcgeo.

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https://github.com/cryptocraigo/programming-for-kids

🚀 Explore programming with this guide for kids. Discover languages like Python and JavaScript, and start your journey in IT careers today.

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https://github.com/delonnewman/gen-test

Generative or property based testing for Ruby

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https://github.com/delonnewman/multiple-dispatch

An implementation of multiple dispatch for Ruby. Also known as generic-functions or multi-methods.

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https://github.com/asarkar/scala-with-cats

Scala with Cats

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https://github.com/delonnewman/hash_delegator

Thread-safe immutable objects that provide delegation and basic validation to hashes.

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https://github.com/petetnt/advent-of-code-2017-reasonml

Advent of Code 2017 with ReasonML

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https://github.com/jottenlips/functionalobjc

λ Example project for using higher order functions in objective c

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https://github.com/hfagerlund/hey-haskell

An introduction to Haskell

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https://github.com/catseye/sally

MIRROR of https://codeberg.org/catseye/Sally : A cute but naïve functional language - "upside-down Forth cake".

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https://github.com/endou-mame/php-monad

📦 Implemented the concept of monads in functional programming in PHP.

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https://github.com/catseye/deturgenchry

MIRROR of https://codeberg.org/catseye/Deturgenchry : An OO language where `self` is a continuation (sort of)

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https://github.com/pjiwm/functional-rust

A Rust library for functional programming, providing function composition, currying, and higher-order functions. This crate can be compiled on nightly Rust.

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https://github.com/umesh-timalsina/ts-monads

Monads Playground in TypeScript

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https://github.com/wdalmut/kata-example-3

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https://github.com/tr-yasuda/kitsunejs

Type-safe Result and Option utilities for TypeScript, inspired by Rust. Safer error handling with a lightweight functional style.

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https://github.com/stevenchen3/ragdoll

Learning Typelevel's Cats library

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https://github.com/heitorgandolfi/elm-todo-list

Simple ToDo list application built in Elm for study purposes

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https://github.com/gabrielgiussi/scala-cats

Exercises from Scala with Cats

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https://github.com/devkiloton/java-ft

Code used in my workshop at UNICAMP university to show the benefits of the functional programming on Java, and compare imperative & declarative code.

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https://github.com/mrbrunelli/my-first-elm-app

My Fist App using Elm Lang

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https://github.com/yoyolicoris/qmul-ecs713-fp-final

My individual coursework of the module ECS713P Functional Programming, QMUL.

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https://github.com/olegalexander/oa-utils

Statically typed Python utilities for functional programming.

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https://github.com/inblack67/elixir-fundamentals---udemy-course

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Porting scala-aoc-2017 to kotlin (to learn the language)

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Introduction to Optics (Lenses, Prisms etc) in Scala.

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Fluently (and efficiently) compose PHP functions, methods, and lambda-expression strings

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https://github.com/chihaya-yuka/hackchat-haskell-bot

Hack.Chat's functional bot.

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

Rewritten React router library [functional principles].

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https://github.com/williamlsh/js-pandora

Practical challenging cases involved with algorithm, functional programming and interviews implemented with JavaScript

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https://github.com/nikdon/15puzzle

Purely functional 15 puzzle

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https://github.com/ashr123/exceptional-functions

A collection of functions that protect against unchecked Exceptions

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https://github.com/tmartins11/progfuncional

Repositório para armazenar todos os projetos desenvolvidos na disciplina de Programação Funcional - BCC | UNIFAL.

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https://github.com/vasilvelikov00/effective-ui

Composable, effect-based UI framework built on Effect.ts

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https://github.com/asllop/calf

Programming language for parallel maths and vector processing in Rust.

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https://github.com/papilo-cloud/pony-express

A simple mail server that stores emails and users. This behaves more like a conventional JSON backend API

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https://github.com/aryan02420/finite-state-machine

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https://github.com/palutz/introtofunctional

Introduction to functional programming slides

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https://github.com/jcoreio/map-shape

apply mapping functions to specific properties of an object

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https://github.com/64j0/poc-cpp-functional

A POC showing how one can leverage C++ functional features to: partial application, higher order functions.

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a library of functions I built to get practice with Clojure

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An OCaml-based interpreter for the Brainf*ck esoteric programming language.

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A testing library for JavaScript that uses behavior-driven development and functional programming.

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https://github.com/joangq/edsl

Abordaje Funcional a los lenguajes de dominio específico embebidos - Curso de ECI 2024

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Java implementation of Contract function

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A Haskell implementation of portfolio optimization using Monte Carlo simulation to maximize the Sharpe ratio for Dow Jones stocks. This project demonstrates parallel processing in Haskell for computationally intensive financial modeling.

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