John Resig

The first part about the Javascript core language is rather mediocre/shallow and "Crockford - The good parts" does a better job at that; even though the book says you should read something like Crockford before reading this book, which doesn't make sense in my opinion.

There seems to be one severe mistake in the first part, when the constructor property of objects is claimed to be a property of the objects themselves, instead of the linked prototypes.

However, in the second part the authors allow deep insights into the problems that come with cross-browser Javascript development and how to circumvent them. It makes clear why something like jQuery, which John Resig is the primary author of, is currently absolutely necessary, and should serve as an excellent primer if one wants to understand the jQuery source code.… (mere)