From my personal experience, I was not ready for this book when I was a beginner at took a stab at reading it. I had written in JavaScript before and stumbled upon this book through the Internet, and it demotivated the life out of me.
I am now about a year and a half of being deeper into the language, and I have finally picked the book back up again.
I am now about a year and a half of being deeper into the language, and I have finally picked the book back up again.