Haskell · version 9.10

Run Haskell 9.10 online

Haskell 9.10 — run it in a Firecracker microVM on ls-judge. Real toolchain, no wrapper.

Starter code

What you get in Haskell 9.10

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

haskell
Haskell 9.10
main :: IO ()
main = do
  line <- getLine
  let n = read line :: Int
  print (n * 2)
stdin →21
expected →42
How it runs

How ls-judge runs Haskell 9.10

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 Haskell 9.10toolchain 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.

Other Haskell versions
Haskell 9all Haskell →