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G#

A modern .NET language with Go, Kotlin, and Swift ergonomics

G# brings Go-, Kotlin-, and Swift-style ergonomics — packages, func, data class, nullable handling with if let, structured concurrency with scope — to the .NET runtime. Source compiles directly to managed assemblies.

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hello.gs
package Hello

import System

func greet(name string) string {
	return "Hello, ${name}!"
}

Console.WriteLine(greet("world"))

Modern, familiar syntax

Packages and imports, func declarations, sealed classes and discriminated enums, arrow lambdas, if let nullable handling, and pattern-based switch. Recognisable from Go, Kotlin, Swift, and TypeScript.

Runs on .NET

G# compiles straight to managed assemblies and runs on the modern .NET runtime. Import any CLR type, call its methods, and ship a normal executable.

Concurrency built in

Structured concurrency with scope, async/await over Task[T], and async sequence[T] async streams. Channels and goroutines ship as an opt-in extension.

Precise numeric types

Width-bearing primitives like int32, uint64, and float64 make the size of every value explicit — no guessing.

Real tooling

A command-line compiler (gsc), an MSBuild SDK, a VS Code extension, a language server, and Portable PDB debugging.

A complete specification

Learn the language from a single, implementation-grounded specification, plus tutorials and an "Effective G#" idioms guide.