Most of the book is great, but the chapter on script loading and web workers aren’t as good as the rest – these chapters feel misplaced in this book and they don’t cover these topics as comprehensibly as the rest of the book’s content. This is minor though – the rest of the book more than makes up for these weaker chapters.
The book covers the basic promise (ha!) of promises and delves into the different approaches you can take in using and managing promises, including how to create your own promises and extend existing callbacks into promises.
(this is not a sponsored review – just a happy reader trying to pass on a book that helped me out)