Elixir 1.4 was released in January 2017. Given that it is an introductory book it would probably be OK.

However I wonder whether

would a be more suitable introduction.

Welcome,
Yes, Elixir and Phoenix have been moving fast these last couple of years. You cannot go wrong by taking Dave’s programming course: https://codestool.coding-gnome.com/courses/elixir-for-programmers.
The online documentation is the most up to date reference: https://elixir-lang.org/getting-started/introduction.html
And Dave’s book on programming Elixir is quite good. https://pragprog.com/book/elixir16/programming-elixir-1-6

Mike

I has nothing to do with the changes. For the price Introducing Elixir is OK. But in terms of a learning path that effectively demonstrates what Elixir is capable of:

• Learn Functional Programming with Elixir
• Elixir in Action 2e

are a better investment of both your time and money.

It would seem that my book store doesn’t have that one.

Most bookstores will let you order books if you ask.

Given than you are already covering Erlang you may want to put

on your Radar (post - Elixir in Action)

That is my typical recommendation. It reduces the number of new concepts one has to deal with when learning Phoenix and builds the Ecto skills to a much more useful level (though SQL still is a separate pre-requisite).