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/lycantropos/lz

Functional utilities

currying functional-programming lazy-evaluation

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https://github.com/hannesm/mirageos-bobkonf2019-tutorial

MirageOS unikernels used for bobkonf 2019 tutorial

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SameGame implemented in Elm

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https://github.com/benhutchison/modesofcomposition

Lambdajam 2021 online workshop in Compositional Functional Programming in Scala

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:warning: experimentation with typescript and functions

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https://github.com/frndmg/compai

Functional primitives for Python

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https://github.com/aifrak/exercism-elixir

My solutions from the Exercism Elixir track | Completed exercices: 159/159 (October 2023)

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use Cassandra via Virgil with Kyo

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Serve HTTP using Algebraic Effects and Handlers

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a simple blog made with the elixir lang and the phoenix framework

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A set of functional utilities for working with callables in Ruby

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rocketchat reminder and bot powered by clojure

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Experimental Zig chainable iterators library

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https://github.com/kubukoz/catharsis

Utilities for cats-effect that don't really fit in the upstream.

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Railway-oriented programming for TypeScript. Result, Option, validation, and composition — practical over academic, no fp-ts complexity.

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Test the shape of your functions!

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https://github.com/rcardin/state-monad-example

An example describing the State Monad features.

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https://github.com/8451/functional-pypelines

Framework for creating composable functions, including an API for running them via a JSON config.

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Fun with JavaScript functions

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https://github.com/pavelosipov/poslens

Objective-C library for persisting and updating immutable data structures using functional lenses

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fp-ts extra functions and utilities

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Command the turtle to draw vector graphics in Elm

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Pure untyped lambda calculus in safe Rust.

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https://github.com/s3b4s/monpar

A monadic parser implemented in TS that an be used to create various kinds of parsers, such as HTML, JSON or CSV parsers.

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https://github.com/r17x/fp.js

Fun λ functional programming in JS

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https://github.com/jaalonso/categorias_y_programacion

Bibliografía sobre teoría de categorías y programación funcional

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https://github.com/mtumilowicz/scala-cats-free-monad-workshop

Introduction into functional programming free structures: free monads, free monoids, free applicatives.

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The new FPIndia static site built using Ema

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Puzzle game thing with an egg

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https://github.com/samadpls/scala-functionalproramming

This repo contains my practice on Scala and functional programming. It includes lectures and labs from various sources that helped me learn the basics and advanced concepts of Scala.

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https://github.com/btravstack/unthrown

Explicit errors as values for TypeScript — with a separate defect channel for the unexpected and qualification enforced at every boundary.

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Fluture-js based middleware for Redux. Handle async actions with FantasyLand compliant Futures, a lazy, monadic alternative to Promises.

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https://gitlab.com/littlesaints/functional-streams

Smart functions for stream processing, fault-tolerance and Java Streams integration of non-streaming APIs and language constructs.

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https://github.com/polytypic/netoptics

Optics for the impoverished

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This pure-Dart package offers a functional approach to handling HTTP status codes 🌐

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Useful PHP Functions version 2

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https://github.com/ksxgithub/deno-compose

pipe, pipeline, and compose functions with 64 overloads per function.

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https://github.com/nshkrdotcom/elixir_scope

Revolutionary AST-based debugging and code intelligence platform for Elixir applications

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A React hook to wrap react-query results with fp-ts-remote-data results.

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Fun tricks for stream-style programming: the inevitable, sad but logical conclusion of iterators and generics in Go

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A* Search algorithm in F#

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A functional/railway-oriented programming library for C++17

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A JavaScript library to write linq style functional code

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https://github.com/ehmicky/declarative-merge

Merge objects/arrays declaratively

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Functional Programming in Python 中文翻译

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https://github.com/catseye/quylthulg

MIRROR of https://codeberg.org/catseye/Quylthulg : A functional language with goto's inside data structures

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https://github.com/yarnaimo/lifts

⛵ LIghtweight Functional programming library for TypeScript

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https://github.com/jasonzhu1313/interactiveexpressionparser

This project focus on using functional programing to parse the expression, I use Haskell to develop an interactive expression parser using a lot of features of Haskell, you can use haskell compiler such as GHCI to run the program, Let's begin.

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https://github.com/adzz/maybex

An Implementation of the Maybe monad in Elixir

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🔥 hellishly fast, 🤏 tiny and 🤖 modular async/sync pipe toolkit for typescript.

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Functional programming for Norwegians ⛷️

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https://github.com/astrolabsoftware/interfaces

How to interface different languages implied in the process of scientific programming especially in the context of the AstroLab Sofware organization, or developments using it.

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https://github.com/goodmanwen/pipeit

Syntax suger for python's functional programming as Unix pipes.

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rust style error handling for cpp

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a typed, functional, concurrent programming language

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https://github.com/jemtaly/projectlambda

A calculator / programming language based on lambda calculus. 基于 Lambda 演算的简易编程语言。

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Pure Functional Database Connection Layer for Java

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Higher-order functional predicates.

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https://github.com/crvouga/match-three

Implementation of a Match Three type game. Swipe around items to match three in a row.

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https://github.com/howprogrammingworks/lenses

Lenses, fp getter & setter

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https://github.com/jaynil1611/programming_exercises

This repository contains solutions of all the homwework exercises of functional programming session of LevelOne.

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dysfunctional programming in python

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https://github.com/cassanof/stiletto

A Compiler written in ML for a python-like (mostly) functional language

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https://github.com/sourceduty/optimation_math

A flexible framework for iterative variable weighting, balancing trade-offs, and adaptive decision-making.

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https://github.com/menacingmecha/gd3_fp

Minimal, single-file functional programming module for Godot Engine 3.x

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https://github.com/makiftutuncu/effect

A basic, home-made functional effect system with powerful errors

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Result type for C#

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https://github.com/jennning/styled-components-ramda

An example project to showcase how to write clean and readable styled-components code with Ramda (FP)

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https://github.com/jiayihu/lab

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https://github.com/julianpasquale/ruby-functional-programming

This repository includes the slide deck and code examples for my presentation about Functional programming in Ruby

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

A bumbling foray in immutable data structures land. In Crystal!

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HList for Swift by statically meta-programming.

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https://github.com/royalicing/shohin

Pragmatic React/Elm-like components & state management for iOS

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https://github.com/oisee/minz

Minz /mɪnts/ - Systems programming for Z80. Features TRUE SMC lambdas, revolutionary ABI for seamless ASM integration, Lua metaprogramming. TSMC delivers 14.4% fewer instructions vs C. Optimized Z80 assembly for retro/embedded.

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