For the past year or so, I’ve been spending part time learning JavaScript. My reason has been we use ExtJS extensively in my company and it’s written in JavaScript. ExtJS is very object oriented so any book that tries to present JavaScript in an OO fashion is a big help.
This book lives up to it’s billing. It starts out going through JavaScript in general, but then moves on to the OO constructs it advertises. For example, Chapter 4 titled simply “Objects” goes through all the basics.
I strongly recommend this book to anyone learning JavaScript for use in an OO environment.