Didn’t happen for “Introduction to Elixir” - so I guess no. There was a time where “upgrades” came at a 50% discount. I hate to say it - but at this point I’d recommend Learn You Some Erlang for Great Good! first anyway (not because it’s free online - but I guess that helps) and look at these endorsements:
“I hope that many of you will enjoy reading Fred’s book as much as I did and that you find learning Erlang to be an agreeable and thought-provoking process.”
—Joe Armstrong, designer of Erlang
“I like this book. It’s a complete description of the Erlang language together with many practical examples. Most importantly, it explains OTP, a set of design patterns and behaviors which allow you to build fault tolerant and robust systems.”
—Robert Virding, co-inventor of the Erlang language
