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Ya I get the sense the Erlang example is written a bad faith a little.

Not my intention at all, please feel free to rewrite it: I don't know much Erlang and I actually copied that code from Rosetta Code.

Apples to apples? I don't do Elixir but this is what I think it's doing:

io:fwrite(string:join(string:tokens("Hello,How,Are,You,Today",","),".")).