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: 2026-07-02 00:11:57 UTC
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https://github.com/ferr0s04/feup-pfl

Repository for PFL (Functional and Logical Programming) course of LEIC FEUP, for year 2024-25

feup feup-leic functional-programming haskell logical-programming prolog

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https://github.com/amsh4/livesketch

Real-time collaborative drawing app with React UI, Elixir backend, and Python analytics. Enables seamless sketching, anomaly detection, and scalable infra.

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https://github.com/davidboers/ElmEither

Implements the Either declaration in Elm.

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https://github.com/hamidurrahman1/interpreter-part-2

Implementation of an interpreter (i.e., evaluator) for the expressions with user-defined functions.

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https://github.com/tansudasli/kafka-sandbox

Apache Kafka installation on GCP and e-commerce product additions scenario to Kafka

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https://github.com/clitetailor/tokenize-monster

Yet another powerful tokenizer in js.

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https://github.com/bmmunga/terminal-screen

Program reads a binary encoded stream of bytes supplied as input and generates a graphical representation of the bytes in a terminal window.

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https://github.com/slamko/ppx_catch

Ocaml PPX for no-exception error handling

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https://github.com/keidrun/fantasy-utils

Small utils for Functional Programming with Promise.

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https://github.com/aligusnet/fsstats

Basic Statistics and Some Probability Library

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https://github.com/michael-yuji/pure-jwt

Pure, functional JWT library for Scala, works with any Monad, any Json library

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https://github.com/al333z/reactiveapplication

Master degree thesis on Reactive Programming.

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https://github.com/geekyfox/scheming

Scheming: The journey through functional programming, language design, insobriety and bad jokes

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https://github.com/b00gizm/typed-chain

A type-safe way to combine interdependent functions into a callable chain

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https://github.com/marcodpt/wand

A tiny JS router that makes no assumptions about its usage.

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https://github.com/jleahred/idata

small tools to reduce mutability and program more functionally with Rust

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https://github.com/surovv/kleisli

javascript with monads and function composition

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https://github.com/dbosoft/dbosoft.functional

Functional helpers based on language.ext

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https://github.com/sobakavosne/solve-the-word

FP Engineer task

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zot: the esolang originally invented by Chris Barker and wrapped with QuickJS

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https://github.com/dragos-tudor/backend-storing

Convenient functions for SQLServer, MongoDb and Redis databases.

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https://github.com/sobakavosne/generator

An application for generating 1 billion records (MySQL). Research & development project

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https://github.com/fusion/uncons.cr

A toy implementation of head|tail destructuring for the Immutable library

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https://github.com/deepcloudlabs/javascript-programming-essentials

Javascript Programming Essentials

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https://github.com/koheing/stream-executor

functional stream programming library

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https://github.com/corporatepiyush/jhighfun

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https://github.com/ghurtchu/msgflow

:speech_balloon: Persistent Chat Server. Tech used: Scala, Java, PostgreSQL.

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https://github.com/willmcpherson2/soop

The Soop Language

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https://github.com/roxtra1/sea-battle_console_game

Игра "Морской бой"

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https://github.com/hugojosefson/fns

Utility functions.

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https://github.com/lcsrodriguez/ensiie_s2_projet_prog_fonc

Git repository containing all the resources related to a school project on DNA/RNA strands construction Phylogenetic tree simulation using Functionnal Programming

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https://github.com/bartstc/looper-js-library

Simple and very modest library written based on functional programming inspired Underscore.js library

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https://github.com/lpld/func-prog-scala

Assignments from the book "Functional programming in Scala": https://www.manning.com/books/functional-programming-in-scala

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https://github.com/krzysiou/scala-labs

Scala course at my university

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https://github.com/supermacro/hangman

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https://github.com/mertturkmenoglu/f-sharp-examples

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https://github.com/alepop/compose

📦 A compose function (another one)

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https://github.com/reubano/devcraft-workshop

Materials for the DevCraft workshop on stream processing

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https://github.com/fabriziomettini/dsa-ii

Resources about my DS&A II course (FCEIA - UNR)

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https://github.com/jtucker/fp-trailblazers

Repository of notebooks that I use for my functional programming talk `Functions! Functions! Functions!`

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https://github.com/MicheleCattaneo/BST-traversal-visualization

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Go Optional, Nullable Types and Functional Utilities.

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Little Deep Learning framework in Racket

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add phnctionality | modules for functional programming | Python + Mypy

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Learning haskell Language solving computer science programming problem. This implies having a better knowledge about how language works and how to understand better how functional languages work.

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https://github.com/vikaspulluri/functional-lite-javascript

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https://github.com/ronanyeah/spotify-fresh

play with your spotify playlists using a Node.js cli

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https://github.com/olekscode/functionalprogramming-assignments

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https://github.com/tsuberim/fun

A purely fun-ctional language with amazing performance

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https://github.com/gabrielczar/functional

Exercises using functional language

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https://github.com/victorlga/functional-etl

A functional ETL pipeline in OCaml that processes order data from CSV files hosted online using map, reduce, and filter, producing aggregated results and storing into a database.

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https://github.com/peter-roh/ocaml

taking 'programming languages' course

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https://github.com/mode89/fdtrie-js

Persistent data structures with fast diff

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https://github.com/brucou/graph-adt

A small (2kb minified gzipped) library to search graphs

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https://github.com/oezg/minesweeper-kt

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https://github.com/vadniks/computercomponentsdesktopapp

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A cross-language exploration of JWT header parsing techniques across multiple programming paradigms

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https://github.com/maxbarsukov-itmo/functional-programming-3

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https://github.com/vitoralvesp/check-verificator

Repositório dedicado ao Projeto "Está em Xeque?", da disciplina Paradigmas de Linguagens de Programação, para o estudo de Paradigmas Funcionais utilizando Haskell.

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https://github.com/okyungjin/fx-playground

Playground for FxJS, FxDOM

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https://github.com/tmccombs/rust-cons

A persistent single-linked list for Rust

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https://github.com/rafaeloledo/functional_js

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https://github.com/eloyhere/semantic-java

Semantic-Java is a modern, maven Java stream processing framework with zero dependencies. It elegantly blends the fluency of Java Streams, the laziness of JavaScript generators, and intelligent index-based control inspired by database indexing — perfect for time-series, event streams, and high-performance data pipelines as a maven pendency.

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https://github.com/bennypowers/power-functions

A wee functional library intended half for entertainment, half for personal edification.

functional-programming javascript

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https://github.com/kamalfarahani/katharos

A library providing useful types and functions for functional programming in Python

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https://github.com/youz/honestb

The Honest B programming language

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

This repository hosts the "Goodies To Go (G2G)" project, an F#-based online ordering system for a canteen, demonstrating domain modeling and basic functionalities.

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https://github.com/albertllousas/flight-booking-microservice

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Writing Lazy K interpreters in various languages

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https://github.com/artificial-sapience/clearflow

Correctness-first orchestration for emergent AI. Type-safe, deeply immutable, 100% code coverage.

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https://github.com/cyboranf/effective-java-3rd

Learning from book

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https://github.com/calvinlfer/zio-intro-game-solutions

My solutions to the ZIO game

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https://github.com/calvinlfer/dag-validator

A simple Directed Acyclic Graph validator that detects if cycles are present

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https://github.com/taimoorzaeem/functional-stuff

Some functional programs.

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https://github.com/max-sir/kotlintraining_koans

Solution for all tasks from Kotlin Koans https://play.kotlinlang.org/koans/overview

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https://github.com/oliver021/helppad-net

Versatile .NET Toolkit: A Comprehensive Set of Miscellaneous Helpers, Classes, and Utilities

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https://github.com/cuchi/turmite

Chaotic two-dimensional Turing machine

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https://github.com/thoughtfool/pocket-squatch

A simple game concept to practice design and logic principles within the 2D world. This was a project that was developed in close partnership with my school-age daughter. She is the inspirational project-manager and creative-director that helped guide the development process.

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https://github.com/shakadak/computorv1

Second degree polynomial solver.

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https://github.com/offensiveedge/urls-le

Zero Hassle URL Extraction & Validation - Extract, validate, and analyze URLs from logs, configs, code, and documentation. Features accessibility checking, link validation, pattern analysis, and comprehensive reporting.

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https://github.com/shakadak/leekwars-functional

list and array functions respectively implemented and reimplemented for currying and performance.

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https://github.com/pfpack/early-core-asyncpipeline

EarlyFuncPack Core.AsyncPipeline is a core library for .NET consisting of asynchronous pipeline.

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https://github.com/bcherny/mapf

Ergonomic Promise.all

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https://github.com/khaledashrafh/petpal-simulation

The PetPal Simulation is a console-based application that simulates the experience of adopting and taking care of a pet. Users can adopt a pet, feed it, play with it, and check its status. The game tracks the pet's hunger and happiness levels, and it ends if these levels drop to critical values.

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