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How it was put together:

I'm the author of this one.

Awesome work, love it!

Is there an Erlang shell to evaluate expressions?

There seems to be a sub-window to the right of the module editor, but I'm unable to place the cursor there.

Tried in both Firefox 35 and Chrome 39.

No, there is no shell. Only main() function can be evaluated. You may be interested in http://tryerlang.org/, but it is much more restricted.

I don't understand about which window you are talking about. May you make a screenshot?

I think he might be referring to the 80 column vertical line

That's correct, thanks for pointing it out.

Awesome! I've been meaning to mess around with Erlang/Elixir.

+1 for Sleep-Sort

-1 for sleep sort.

Hmm maybe I should build one of these for Elixir. Does anyone know if there is one already for Elixir?

os:cmd is still available, and has access to things it should not.

Don't worry - it's on read-only chroot and inside restricted linux sandbox. You may try to read /etc/passwd http://tryerl.seriyps.ru/#id=30f6 or even list running OS processes http://tryerl.seriyps.ru/#id=12f2

Nice job!

Very nice sandbox

Yes, thank you!

Try Erlang online