Elixir · version 1.18

Run Elixir 1.18 online

Elixir 1.18 — run it in a Firecracker microVM on ls-judge. Real toolchain, no wrapper.

Starter code

What you get in Elixir 1.18

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

elixir
Elixir 1.18
n = IO.read(:stdio, :line) |> String.trim() |> String.to_integer()
IO.puts(n * 2)
stdin →21
expected →42
How it runs

How ls-judge runs Elixir 1.18

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 Elixir 1.18toolchain 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 Elixir versions
Elixir 1.17Elixir 1all Elixir →