How relevant is the book "Javascript Patterns" by S. Stefanov?

Question

JavaScript

Good afternoon, tell me please, how relevant is this book in the realities of modern javascript?

Answer 1

Relevant until nothing else has been written about JS, just by reading a book, represent classes instead of prototypes. Well, or read something else, the same gang of four.
Here are more materials on the topic
https://www.ozon.ru/context/detail/id/20216992/
https://refactoring.guru/ru/design-patterns

Answer 2

Scrolled through, similar to Airbnb()'s JavaScript Code Guide , but more detailed. The purpose of the book, as I understand it, is to show the features of js code, and how best to do what can be achieved in different ways.
What is written there will probably still be relevant for a very long time. But, for example, instead of varnow it is customary to use letand , for some reason I did not find a mention constof the operator that it is better not to use it. deleteI think it's not critical.