[erlang-questions] List matching, help me make this look better

[Jarrod Roberson]

>
>   myfunc("aaaa" ++ _) ->
>        io:format("matched aaaa~n");
>
> instead.  Works also as:
>
>   myfunc("aaaa " ++ R) ->
>       io:format("matthed aaaa~n"),
>       io:format("R matches 123 in your example file");


can somebody explain what the ++ operator is called and is doing there?
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