Run Go 1.22 online

What's in Go 1.22

• Loop variables scoped per iteration — no more `for i := range xs { go func(){ use(i) }() }` bug.
• net/http gets path parameters and method-scoped patterns.
• Vendor security fixes propagate faster with the new govulncheck integration.

What you get in Go 1.22

Clicking "Run now" opens the playground with this exact code and a matching test case — passes on first Run.

package main
import "fmt"
func main(){var n int;fmt.Scan(&n);fmt.Println(n*2)}

How ls-judge runs Go 1.22

Every submission is compiled and executed inside its own Firecracker microVM — the same isolation primitive AWS Lambda uses. No shared container, no shared kernel with other users' code. The Go 1.22toolchain shipped with the microVM is the real thing (not a browser-side emulation): syscalls behave the way they do in production, and the compile / runtime behaviour matches what you would see on your own machine with that version installed.

Feed stdin from the Tests panel, watch verdicts stream per test case over a WebSocket. Free to use, no sign-up, works from any browser.