While I am an adult (not a kid), I am a beginner to JavaScript, so I thought this book would be worth checking out— if it's easy for a child to understand, then it must be a good introductory to this coding language, and if I can't understand it, then either it's still too advance for sixth graders, OR I'm just not as smart as a sixth grader.
The projects are, well... juvenile, but that goes with saying. It's cute, and I bet it's fun for those hitting the demographic. That said, I can't imagine how anyone around the age of 12 (book recommendation says 10+) would react to this text. Would they be engaged enough to read and practice these projects independently, or even with a parent figure? I can't speak about this book from their perspective, but only from the perspective of an adult individual learning to code.
As mentioned, the projects were easy and fun introduction to using concepts in JavaScript. Although most of my projects kept coming up blank or running differently than it should have, so either the html reader I was using wasn't a proper editor, or I needed to edit the code for it to work properly, OR I'm just not as smart as a sixth grader!
Still, I was introduced to and learned new concepts of JavaScript and it gave me better practice flow to writing html script. I'll be able to take away projects from this book to practice and perfect so that I can create functional games. It might be worth taking a look at if you're interested in learning JavaScript for the first time.