How are authors able to write a book on a framework that is just released? A framework like spring is updated, and a book is released in the next day. Is this typically by people who are direct contributors? Are they basing it off of beta/alpha versions?
I find this rather difficult to understand as that documentation is rarely up to snuff by the time the framework is updated.
Those who write books about frameworks are generally involved in the framework they are writing about, they have access to documentation and pre-release versions of the framework. They aren't random people that know about programming, they likely contacted the development team about writing a book and got the information or were asked by the development team to write a book. Also good frameworks keep their documentation up to date, its part of being a good framework, though the general public may not have access to the most up to date documentation.
