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1) if you've done any programming in another language before, you will find the first couple of hundred pages heavy going, as it explains very basic concepts in excessive detail. But you still need to read these chapters as a few things come up which are peculiar to JavaScript.
2) It's just plain wrong, or incomplete in places. For instance, the browser-detection example given doesn't actually work because of some basic errors in the code. And it neglects to mention a lot of the vital peculiarities where Netscape's JavaScript and IE's JScript diverge in their behaviour. If the book is to be believed you'd think all Javascript 1.2 code would work on the latest Netscape and Microsoft browsers. It won't. It's just not that easy unfortunately.
3) Good for learning, but not much use as a "reference". Hard to find the info you want while you're coding, and when you do find it it's frequently too sketchy to give you any insight into your problem.
So don't rely on this book as your only JavaScript reference. You will have to look elsewhere to find out the truth and get your scripts working properly. Particularly if you want your code to work in Explorer.
"JavaScript Unleased" is clearly written with to-the-point explanations. The examples are real world and fit in nicely with each chapter while the book covers the latest version of JavaScript (1.5) completely. The David Flanagan/O'Reilly and Danny Goodman/Bible books are ancient history from 1998 already! I also feel this book is more complete than the Flanagan book and Danny Goodman's explanations are too wordy.
If your are an intermediate to experienced developer buy this book you won't regret it.