Elixir is based on Erlang, but it borrows heavily from Ruby. If you understand functional programming (or if you want to), this is an excellent new language to learn. If you appreciate the beauty and elegance of Ruby, you might love Elixir, too.
Hal Fulton has two degrees in computer science and 30 years of experience. He learned Ruby in 1999, and attended the first Ruby Conference in 2001. He is the author of The Ruby Way, now in its third edition, which was the second English-language book on Ruby.