Actually from my dabblings with Erlang I never felt the need to deal with Elixir, then again I was a big Prolog fan during university days (yes I do know that the resemblance is only superficial).
Not to be contrary but I’d call it more than superficial, the inventors of Erlang were using Prolog before they created Erlang. Also, IIRC the first version of what would become Erlang was actually a Prolog variant.
