LabStack: Multi-language programming playground

From the title I was hoping against hope that it would allow me to easily call functions written in one language from functions written in another.

Disappointed again.

So how is it so fast?

Cool. Running a Haskell program with a compiler error doesn't show the error.

This is kind of cool. How do you prevent people from running malicious code?

Nice! Consider adding Lisp, scheme, forth?

Proposal to add support for perl6, d, zig?

Was considering using this as comparative language teaching tool, and the thing that struck me most was the verbosity of Java compared to other languages:

  fun main(args: Array<String>) {
    println("Hello from Kotlin!")
  }

vs.

  public class Main {
    public static void main(String[] args) {
      System.out.println("Hello from Java!");
    }
  }