By the way, Erlang’s 'foo bar' is Elixir’s :"foo bar". They are atoms.
BTW, you can call Elixir functions in Erlang. For example, the way of calling Elixir function String.split("a, b, c", ", ") in Erlang is
'Elixir.String':split(<<"a, b, c">>, <<", ">>)
