The author considers his book as an introductional tutorial, which it's definitely not.
I was a bit disappointed first as it goes into too much detail on the basics of web development and Rub y the language, but then I got enlightened. This book is called "Introduction to Web Development with Ruby on Rails", therefore it doesn't expect its reader to have any experience with RoR, Ruby or web dev whatsoever.
This book allows its reader not only to grasp the basics, it empowers him to do apps that's are production ready without any prior frontend experience. Javascript is not very well covered though. However, in the world of RoR that doesn't matter that much.
I wish I had read a book like this before. Unfortunately, the heyday of RoR has been long gone, but this doesn't make this book any worse.
This book is a must read if you're thinking to touch any RoR project.
My score is 5/5