G# language for .NET borrows from Go, Kotlin, and Swift

Small and simple language in the works runs on the .NET runtime, interoperates with CLR libraries, and compiles to managed PE assemblies that are accessible from the standard .NET toolchain. G# (GSharp) is moving forward as a programming language for Microsoft’s .NET platform, touted as bringing Go-, Kotlin-, and Swift-style ergonomics to the CLR (Common Language Runtime). The language is described by its creators as modern, simple, and accessible. Although pre-1.0 and still growing, G# aims to be for people who want a small, predictable language with direct access to the .NET ecosystem. Developers will see imports, func, structs, slices, maps, channels, go, select, and for in iteration. Also important are nullable flow, direct calls into the CLR (Common Language Runtime), and built-in concurrency. With G#, copyrighted in 2026, developers get value-oriented structs, reference-oriented classes, data structs, and data classes. For concurrency, G# uses scope for structured concurrency, async func and await for task-based asynchrony, and async sequence[T] for asynchronous streams. G# also makes use of the same Task and Task[T] types familiar from the .NET BCL (Base Class Library). G# documentation is available on the GitHub site of Microsoft software engineer David Obando. “Every .NET type—your packages, third-party NuGet packages, the BCL—is callable from G# with the syntax you already know. CLR generics use G#’s bracket spelling, and method calls, properties, indexers, and for in over IEnumerable[T] all just work,” according to the website. A Visual Studio Code extension for G3 can be found at marketplace.visualstudio.com. The extension adds syntax highlighting, language server features, build/run commands, and debugger configuration for .gs and .gsproj files. Developers can install the extension from within VS Code (search for “G#” in the Extensions view) or from the command line.