322711 (7) [Avatar] Offline
In section 3.4.3 on page 90 of the print version of the book, a closing parenthesis is missing:

The function Enum.each/2 takes an enumerable (in this case, a list)
sjuric (86) [Avatar] Offline
3.4.3 missing a closing parethesis
Good catch, thanks for reporting!
Obviously, since the book is published, this will have to go to errata.