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. Search

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.