How JavaScript Works

This book is for people who have had some experience with Java­Script and want to have a better deeper understanding of how it works and how to use it well. It is also for experienced pro­gram­mers who are looking to understand the workings of another lan­guage.This book is not for beginners. I hope to someday write a book for beginners. This is not that book. This is not a light book. If you skim it you will likely get nothing from of it.This book is not about JavaScript engines or virtual machines. It is about the lan­guage itself and the things every pro­gram­mer should know about it. This book is a radical reappraisal of Java­Script how it works how it could be made better and how it can be better used. It is about how to think about Java­Script and how to think in Java­Script. I am going to pretend that the current version of the lan­guage is the only version. I am not going to waste your time by showing how things worked in ES1 or ES3 or ES5. That does not matter. The focus is on how Java­Script works for us now.This book is not comprehensive. There are large complex chunks of the lan­guage that will be dismissed without a word. If I fail to mention your most favorite fea­ture that is most likely because that fea­ture is crap. I will not be paying much attention to syntax. I am assuming that you already know how to write an if statement.