Only by looking at the table of content I knew that this is going to be a fun read. The book is actually structured like a set of full-day classes or better said a training workshop for beginners in Swift. It starts with the basic elements of Swift, then covers code workflow and finishes of with more advanced topics like closures and error handling.
Honestly, it's always great to attend social events for software developers, eh craftsmen. Those unique opportunities to meet with other geeks in the field are undenyable and there should be more events like this throughout the year. Apart from getting introduced to new peeps and got quite a number of questions regarding the past and future Developers Conference.