❤ Verse programming language

Functional logic language developed by Epic Games - repo of all informations, official resources and snippets

Also called "MaxVerse" by SPJ: "Analogy Haskell" "built on top of VC"

🔴Official descriptions of language by its authors

---

General descritpions

• Verse is a functional logic language (like Curry or Mercury)
• Verse is a declarative language: a variable names a single value, not a cell whose value changes over time
• Verse is lenient but not strict:
• Like strict: everything gets evaluated in the end
• Like lazy: functions can be called before the argument has a value
• Verse has an unusual static type system: types are firstclass values
• Verse has an effect system, rather than using monads
• Verse is open: Open spec, open-source compiler, verifier, published papers, runtime under permissive open-source license with no IP encumberances
• Mutable state, I/O, and other effects
• Pervasive transactional memory
• Structs, classes, inheritance

Ideas & visions

• Kick functional logic programming out the lab and into the mainstream

• Learnable as a first language (c.f. Javascript yes, C++ no)

• Stretches from end users to professional developers

• Transactional memory at scale

• Very strong stability guarantees

• A radical new approach to types

• Extensible: mechanisms for the language to grow over time, without breaking code

  ---

_{do not confuse with: https://github.com/verse-lang/verse https://github.com/Idyllei/verse-pl}

Official materials:

• ▶Beyond Functional Programming: The Verse Programming Language (Simon Peyton Jones) _{Dec 2022 SPJ}
  • 📟 ^slide deck
• ▶ The Verse programming language GDC 2023

---

💙 Verse in UEFN - Unreal Editor For Fortnite

Called "ShipVerse" by SPJ or "BetaVerse"(Tim Sweeney) "very conservative subset" of Verse programming language avilable in UEFN, sometimes related as "Verse scripting"

UEFN Verse does differ a bit from Verse programming language and what we see in VC

I've made video summarizing how Verse might play in UEFN and to clarify these 3 different terms: CoreVerse, ShipVerse, MaxVerse _{at 4:14 video time, video is from before UEFN release and has many predictions}

Official materials:

• ▶2020 Year In Review | Inside Unreal (reveal of Verse scripting language) _{at 1:00:45 video time. Dec 2020}
• ▶ The Verse programming language GDC 2023
• 📘 UEFN Verse documentation

---

💚 Visual Verse - visual scripting language developed by Epic

Epic is working on visual scripting language and Unreal Engine IDE for it and to be used potentially in UEFN/Fortnite

🟢 Visual Verse - what we know alreadyc

---

Epic is working on Visual Verse visual scripting language

• Visual scripting is a process of using a visual programming language to create computer programs/scripts. Instead of writing lines of code You use GUI elements, connecting nodes/blocks defining behaviour & logic (Unreal Engine uses Blueprints (old Kismet) visual scripting language heavily in UE editor for most of in editor avilable tasks & scripting logic)
• there are not much informations about it beside registering trademark, recruitment posts for Fortnite (probably UEFN) 1 2, and some minor mentions/leaks related to it
• From those we know IDE for Unreal Engine for VV is in the works

---

---

💜 VC - Verse Calculus

New Core Calculus for Functional Logic Programming

Called "CoreVerse" by SPJ "analogy: Lambda Calculus" but made for Verse and FLP languages

Official materials:

[1📝]: The Verse Calculus: a Core Calculus for Functional Logic Programming

---

repo: VC_VerseCalculusNotes contains notes from [1📝] WIP

---

Other Verse related works:

• _{miniVerse Attempt adhering to VC rewrite semantics with runnable examples from [1📝] written in authors miniVerse notation}

_{This repo is not endorsed by Epic Games, Inc. I'm not Epic Games employee. Made solely for learning and knowledge sharing}