However, the book changes quite fast in difficulty. I am not experienced in jQuery and I could follow the book pretty good up until ~60 page out of the 91 total pages. The rest of the pages were hard to understand and, in my opinion, a bit too advanced for an introductory book. Also, the indentation of the examples was way off. In the last 20 pages I was opening the samples reformatting the indentation to make some sense.
You can find & download the book in the official Github.