[scrame]

I found it to be somewhat basic. The primary language is Java so a lot of the techniques are rooted in the kind of "move the dirt around" refactoring that you get with that language, and indeed covers what became the "refactoring" options in Java IDE's. Its a good overview of the ideas of refactoring, but often ends up creating more code and structure, since its often hard to change things in Java without adding more code.

Javascript has a lot more first-class options other than classes and interfaces, so there might be some more insight.

As far as good programming books, I quite liked Code Complete when I was a younger programmer, and found that Anti-Patterns was helpful in giving me a lot of vocabulary and patterns in recognizing what happens in job-settings, as well as refactoring overviews as a solution to real problems.