Perl · version 5

Run Perl 5 online

Perl 5 — run it in a Firecracker microVM on ls-judge. Real toolchain, no wrapper.

Starter code

What you get in Perl 5

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

perl
Perl 5
my $n = <STDIN>;
chomp $n;
print $n * 2, "\n";
stdin →21
expected →42
How it runs

How ls-judge runs Perl 5

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 Perl 5toolchain 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.