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Erlang was designed in 1986 at Ericsson by Joe Armstrong, Robert Virding, and Mike Williams as a language for writing fault-tolerant telephone switches. Today it powers WhatsApp's messaging, RabbitMQ, and most of CouchDB. Elixir runs on the same VM (BEAM).

A minimal Judge0-runnable program needs a module + main function:

-module(main).
-export([main/1]).

main(_) ->
    io:format("Hello, Erlang!~n").

• -module(main). declares the module name
• -export([main/1]). exports the main function (arity 1)
• main(_) ignores the argument with _
• ~n is Erlang's newline format specifier
• Statements end with . (period)
• Expressions inside a function are separated by , (comma), and the LAST one has no separator before its .

No semicolons. Periods end definitions.