Functional Programming In Games

Welcome to this page! Hope you find what you are looking for

I don't know you, but when I was learning how to do funcitonal programming I wanted to program fun things, or something other than a "website for your cat(tm)" so I was looking for FP in games and there wasn't much around at the time... so I created this list.

Please note: this list is not complete. If you find something missing or incorrect, please send a PR or create an issue specifying the problem.

Thanks

Some resources for Functional Programming in Games Resources

Books

• Haskell: Game Programming in Haskell
• F#: Friendly F# Not totally about games but all examples are game related
• Lisp: Land of Lisp
• Racket: Realm of Racket
• Rust:
  • Learn game development in Rust
  • Hands-on Rust- Effective Learning through 2D Game Development and Play
  • arewegameyet.rs links to 5+ books, and there are also tutorials, videos, etc.

Tutorials

• F# game tutorial series with Monogame
• Arcadia - Clojure on Unity3d
• Building flappy bird from scratch with Arcadia at November Clojure NYC Meetup
• Writing a 2048 clone in elm
• Caves of Clojure a blog series on how to develop a Roguelike in Clojure. Code.
• Game development in Clojure (with play-clj)

Videos

• Building a platform game from the ground up with F# and MonoGame
• A reactive game stack: Using Erlang, Lua and Voltdb to enable a nonsharded game world
• Writing a game in Haskell
• F# in Social Gaming
• My adventures with Elm
• Morgan Mullaney - Well I Wouldn't Want To Make a Dysfunctional Game (Video)
• Games and 3D Graphics in Arcadia
• CodeMesh 2014 - Arcadia: Functional Video Game Development
• Making Games at Runtime with Clojure (with play-clj)
• RustConf 2018 - Closing Keynote - Using Rust For Game Development by Catherine West
• Rust Linz, 2021 - Herbert Wolverson - Learning Rust with Game Development - this video is by the author of Hands-On Rust

Presentations

• My adventure with Elm - Yan Cui

Papers

• Monadic Scripting in F# for Computer Games
• A Formal Specification for Casanova,a Language for Computer Games

Libraries and engines

Haskell

• HELM An FRP game engine inspired by Elm.
• FunGEn A BSD licensed, cross platform non FRP game engine written in Haskell.*
• Haskell game related libraries
• LambdaHack Haskell game engine library for roguelike dungeon crawlers.

F #

• Duality Scripting Allows you to write F# on the Duality Game Engine (the compiler is integrated into the editor so you can write code on any editor you want). This plugin supports C# too.
• Nu Game Engine cross-platform F# 2D game engine. It encourages to use as the architecture a variation of FRP which he calls Iterative Functional Reactive Programming.
• Unity 3D can be used with F#. There are multiple examples in the internet, for example this one.
• Godot can be scripted with F#. Setup guides for Godot 3 and Godot 4.
• Monogame based F# engine Mibo

Clojure

• play-clj A wrapper around libGDX. It supports pc, Android and iOS (through RoboVM).
• brute An Entity Component System which supports both Clojure and ClojureScript. Some information on the thinking behind the implementation are on the author's blog.
• Arcadia Clojure integrated into the Unity engine. It uses ClojureCLR. It has been used for interactive art installations and game jam games.

Scala

• Indigo: A Scala 3 / Scala.js 2D game engine built specifically for functional programmers.
• SGL: Scala Game Library (SGL) is a library for developing cross-platform 2D video games in Scala. It provides a high-level API for building games, and can export games to the Desktop, Android, and the web. More platforms, including iOS and consoles, are on the roadmap.
• Minart: Scala library with low-level primitives for making media applications such as games. Compiles to the JVM native and JS.

Awesome Gamedev Repositories

• OCaml: Awesome OCaml Gamedev

Games

Shipped or in development commercial games made with FP languages

• Onikira: Demon Killer is a 2D side scrolling beat ‘em up set in a fantasy feudal Japan. It's on Steam (tho unsupported), parts of it written in F#.
• Wayward Tide A game in development, targeting pc and written in Haskell
• Magic Cookies Published on iTunes and Google Play for Android, it's written in Haskell.
• Nikki and the Robots is a 2-dimensional platform game written in Haskell, now open source. It's published on Steam.
• [Asteroid Sharpshooter] published on Xbox Live Indie Games, written in F#. Slides on the development process. His blog has more information on how he made F# work with XNA on Xbox 360.

Open source

• Game jam games

  • An Evening of Modern Dance made with Arcadia (Clojure) for Ludum Dare 32. Source available.
  • Elm Flyer made with Elm. Source.
  • Castle of Elm 7DRL game made in Elm. Source, slides on Elm and developing a game jam game with it.
  • Hyper Loop Runner LD47 racing game made with Scala. Source
  • Volcano Lullaby LD50 platforming game made with Scala. Source
  • 10 Second Lander MJ130 clone of lunar lander with a time limit. Source
  • Xtreme Skydive 3D 32BitJam entry based on Nokia Skydiver. Source

• More open source games, by language

  • Haskell
    • Haskanoid A breakout game in Haskell using SDL and FRP, with Wiimote and Kinect support. Available on Google Play.
    • Allure of the Stars is a near-future Sci-Fi roguelike and tactical squad game written in Haskell.
    • Nikki and the Robots commercial game written in Haskell, now open source.
  • Scala
    • The Minartaur's Lair Roguelike following the rougly following the "Yet another roguelike" tutorial. itch.io

• Meta - games that teach functional programming concepts in-game

  • cube-composer
    • "A puzzle game inspired by functional program