Verse (programming language)

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Verse

Paradigm	Object-oriented
Designed by	Simon Peyton Jones, Tim Sweeney, Lennart Augustsson, Guy Steele, Olin Shivers, Ranjit Jhala, Koen Claessen, Joachim Breitner
Developer	Epic Games
First appeared	2023; 2 years ago (2023)
Typing discipline	Strong
License	Proprietary
Filename extensions	.verse
Website	dev.epicgames.com/documentation/en-us/uefn/verse-language-reference

Verse is a static typed object-oriented programming language created by Epic Games. It was released alongside UEFN in March 2023 and was authored by a team of well-known programmers led by Simon Peyton Jones, and Epic Games CEO Tim Sweeney. Verse is designed to interact with Fortnite Creative's existing ‍​devices system. As of June 2024, UEFN remains the only way to interpret, parse, compile or run Verse code; plans to implement the language into the release of Unreal Engine 6 have been discussed.^[1]

Verse supports modular programming, allowing developers to import specific modules required for their scripts. Commonly used modules include the API digests that are generated every time a project containing verse is opened. There is an API digest to access and interact with Fortnite objects, Verse objects, and Unreal Engine objects. Developers can also create their own modules and import them into scripts if needed.

Verse employs a class-based object-oriented programming model. Developers can define classes to represent various game entities and behaviors.

For example:

hello_world_device := class(creative_device):
    OnBegin<override>()<suspends>:void=
        Print("Hello, world!")
        Print("2 + 2 = {2 + 2}")

The above code defines a new class inheriting from `creative_device` and prints the traditional "Hello, world" message. All classes inherited from a `creative_device' can be placed into the engine's spatial environment when compiled. The `creative_device` class is necessary to interact with the pre-existing Fortnite Creative toolset.

Verse allows defining functions within classes. These can perform various operations, such as mathematical calculations, game logic, and more. The example below is a method to determine if a character is looking at a specific location.

IsLookingAtLocation(Character:fort_character, LocationToCheck: vector3, Threshold: float):logic

The language supports event-driven programming, where events like EliminatedEvent and PlayerAddedEvent can trigger specified functions. Events can also be subscribed to and listened for.

Verse supports various mathematical functions necessary for game development, such as calculating magnitudes, normalizing vectors, and converting rotations to direction vectors. The spatial math module provides classes and functions for vector and rotational math, essential for game development tasks like positioning and movement.Cos, Normalize, Distance , ArcTan, and Lerp are a few of the functions are available for mathematical operations.^[2][3]

Verse code shares several similarities with lambda calculus, particularly in how it handles functions and data. In lambda calculus, functions are first-class citizens, meaning they can be passed as arguments to other functions, returned as values from other functions, and assigned to variables; while in Verse functions can be passed around and manipulated similarly, showcasing the functional programming paradigm. Examples include methods like Normalize(v1:vector3) and DrawDebugLine(LineStart: vector3, LineEnd: vector3). Verse supports lambda expressions and anonymous functions, allowing for inline function definitions, similar to how lambda functions are used in languages like Python or JavaScript. Verse also allows for composing functions by chaining method calls and passing functions as parameters. The declarative style used in lambda calculus is also a prominent feature of Verse for defining data transformations and computations rather than an imperative control flow model. This is seen in functions like Normalize and DrawDebugLine which are defined declaratively.^[4][3]

Epic Games has described Verse as the programming language for the metaverse and has factored mass scalability into its development. Until the proposed convergence with Unreal Engine, it is yet to be seen how Verse will behave interacting with various systems and processes outside of the Fortnite ecosystem.

• Official website