Gossamer

Why Gossamer Expressive and clear syntax Forward pipes (|>), immutable by default, and one obvious way to do things. Data flows top-to-bottom, the way you wrote it — not nested inside-out. Automatic memory, no GC pauses Deterministic reference counting plus arena { } regions reclaim memory the moment it's done. No borrow checker, no lifetimes, no stop-the-world collector. Real goroutines, colorless functions go and typed channels on an M:N scheduler. Blocking calls park the goroutine, not the thread. No async, no await, no function colouring. Run it, or ship it A bytecode VM and a REPL for fast iteration; a single, dependency-free native binary via LLVM when you ship. Same language, your choice of tier. Familiar types, fewer surprises Result / Option / ?, exhaustive match, traits, generics, and no null. If you know Rust, Go, or F#, you can already read it. Batteries included, extensible in Rust A broad standard library — HTTP, JSON, crypto, SQL, compression, and more — and a clean path to drop down into safe Rust when you need it.

See it in a few lines Hit Run on any sample — it executes right in your browser, no install. Gossamer's VM is compiled to WebAssembly.

fn double(x: i64) -> i64 { x * 2 } fn add(a: i64, b: i64) -> i64 { a + b } fn clamp(lo: i64, hi: i64, x: i64) -> i64 { if x < lo { lo } else if x > hi { hi } else { x } }

fn main() { let n = 3 |> double |> add(10) |> clamp(0, 100) println!("answer: {}", n) }

Coming from another language? Short, focused guides that map what you already know onto Gossamer.

Get started Write a .gos file and run it with the gos toolchain — no build step needed while you iterate: $ gos run hello.gos hello, gossamer

$ gos build --release hello.gos # one native binary, ready to ship Runs on Linux (x86_64, aarch64, armv7), macOS (Intel & Apple Silicon), and Windows (x86_64). Install → Read the docs