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: 2026-07-08 00:12:18 UTC
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https://github.com/huanghaiyang/todash.dart

lodash implement by dart

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https://github.com/sebbekarlsson/simple-pipe

🚿 Function Composition for Python

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

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https://github.com/neiljbrown/java-functional-interface-examples

A set of Java code examples illustrating the set of functional interfaces that were added to the JDK's java.util.function package in Java 8+.

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https://github.com/mickstanciu/go-fn

GO Functional Programming

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

Python with a sweet functionnal taste

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https://github.com/meetzaveri/elite-async

🛠️ Zero dependencies, pure vanilla, slim and compact set of async utilities

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https://github.com/phipsgabler/dsl-examples

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https://github.com/segfaultax/pyeither

An implementation of Data.Either from Haskell in Python

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Pure batching for Scala

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Simple, typed, composable tools for callables.

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https://github.com/sigilbyte/functional-programming-language-fun

About Fun is a playful implementation of the basic functional programming language F. This was a group project by CS students @ LMU Munich.

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Code, etc for a meetup event. Monad transformers talk I gave at Brighton.

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Representation of higher-order functions for property testing

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https://github.com/timonson/bashfunc

A small Bash library for functional programming - map, filter, reduce and more

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❄️ An example of managing state using Purescript in a React app

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

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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/reslava/nuget-package-reslava-result

Railway-oriented programming for .NET. Handle errors without exceptions, compose async pipelines, and generate Minimal API endpoints automatically. Result<T>, OneOf, Maybe, LINQ syntax, and Roslyn analyzers — all in one zero-dependency package.

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https://github.com/joebew42/elixir_mostly_adeguate_guide

Examples from "Mostly Adeguate Guide" written in Elixir

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https://github.com/coderaiser/zames

converts callback-based functions to Promises and apply currying to arguments

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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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Dashboard that allows the user to view data and images from one of the Mars rovers.

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https://github.com/lukaszcz/hcpl

A prototypical proof checker and programming language based on illative combinatory logic

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Inquiry is a process flow that allows one ask multiple questions about a subject value. This process grants observability over all results, returning a collection of all successes, failures, and the original subject.

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https://github.com/scala-szeged/Scala-Course-Hungarian

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Date and time types and instances

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https://github.com/leolanese/becoming-functional

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https://github.com/muddassir235/tilawa

An Android Library, written in Kotlin, for streaming tilawa of the Qur'an from the web. Currently mp3quran.net is supported

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like bindall but lazy - meaning closures get created when needed.

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PrimeFuncPack Unit Test - a functional programming pack for .NET

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This is a library of utilities to encourage functional programming in Java, particularly for Java-8 developers but not exclusively.

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https://github.com/richecr/holo-fn

A minimal functional library for TypeScript featuring monads like Maybe, Either and Result. Built for composability and Rambda compatibility.

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https://github.com/narimiran/adventofcode2019

My OCaml solutions for Advent of Code 2019

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https://github.com/imrafaelmerino/vertx-effect

Vertx-effect brings functional effects to the Vert.x ecosystem and is inspired by Erlang’s actor model. Its manifesto emphasizes principles such as maximizing the use of verticles for scalability, maintaining single responsibility for each verticle, and prioritizing simplicity to enhance reliability and ease debugging.

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https://github.com/erthium/boids

Simulation of Boid artificial life program

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The Elm Architecture for TypeScript with Effect

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https://github.com/pertsevds/predicate_dispatch

Predicative dispatch decorator for Python, based on idea from book "Functional Programming in Python"

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https://github.com/gregros/zenesis

Revolutionary generator for type declarations.

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https://github.com/sandromaglione/supabase-ts

Use supabase with Functional Programming and fp-ts

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JavaScript library for common FP patterns

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https://github.com/aygp-dr/scheme-llm-toolkit

Composable Guile Scheme library for LLM integration featuring functional APIs, type-safe bindings, and meta-programming support for AI-powered development

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https://github.com/iamfarrokhnejad/swiftshare

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https://github.com/jezek/funson

another approach to functional json for fun

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https://github.com/totallymoney/dynamodb.ok

Functional wrapper around AWS DynamoDB client in F#

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https://github.com/rborovina/scala-minesweeper

This is a Scala implementation of the classic Minesweeper game. The project features different difficulty levels, the ability to save and load games, hints, and a scoring system that takes into account the number of bombs, hints used, elapsed time, and user actions.

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https://github.com/belsrc/fjp

WIP, ye be warned - Function Js Playground: A place for me to play with functional coding in Javascript

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https://github.com/vonzhou/scalaimpatient

Scala for the Impatient 《快学Scala》第一版习题代码

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https://github.com/papilo-cloud/mern-skeleton

This skeleton application will encapsulate rudimentary features and a workflow that's repeated for most MERN applications.

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https://github.com/univalence/spark-plumbus

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https://github.com/joggrdocs/funkai

A composable AI microframework built on ai-sdk, curried with funk-tional programming flair.

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https://github.com/harrisongrodin/structure-editor

Structure editor for a basic typed functional programming language

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https://github.com/jeffersonribeiro/html5-canvas-tetris

Built by following Math Math Method Tutorial

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https://github.com/alcestide/lisperatu

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https://github.com/leakyabstractions/result-api

🎱 Result library API

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Learn Haskell from many great resources on Youtube.

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Learning Functional Programming library Crocks, Maybe type and more

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https://github.com/b-gran/reducer-redux

Beautiful, functional redux reducers

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https://github.com/imfi-jz/haxe-functional

Tools for writing Haxe code in the functional programming paradigm.

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https://github.com/crvouga/simon-says

Implementation of the game Simon Says. Test your memory by seeing how long of a button press sequence your can remember.

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https://github.com/ortense/functors

A collection of dependency-free functors written in TypeScript, created to be type-safe, immutable, and lightweight.

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https://github.com/egorkhaklin/glass

A pure functional language whose compiler is written in Glass and self-compiles to byte-identical C, carrying a from-scratch zero-knowledge STARK prover: write a function, get a proof of its result. Hindley-Milner types, effects, exhaustive matching.

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