Eloquent Ruby is one of my favorite books, too. That book really motivated me to learn how programming languages work. Here are a few other books I found to be enjoyable and well-written:
Programming Erlang by Joe Armstrong
Programming Elixir by Dave Thomas
Seven (more) Languages In Seven Weeks by Bruce Tate
Think Bayes, Think OS, How To Think Like A Functional Programmer (Think OCaml) and The Little Book of Semaphores by Allen B. Downey
Programming Erlang by Joe Armstrong
Programming Elixir by Dave Thomas
Seven (more) Languages In Seven Weeks by Bruce Tate
Think Bayes, Think OS, How To Think Like A Functional Programmer (Think OCaml) and The Little Book of Semaphores by Allen B. Downey