Core team member Christophe Porteneuve has been hard at work for the past few months tracking and documenting Prototype for his new book Prototype and, which is now available as a Beta Book from the Pragmatic Programmers (and is scheduled to ship later this year).

The first half of Christophe's book is a whirlwind tour of Prototype: it starts with the convenience functions, explains how Prototype extends JavaScript's built-in objects, and goes on to cover event handling, DOM traversal and manipulation, and Ajax techniques. It even explains how to extend Prototype to suit your needs, as well as how to contribute your changes upstream. Check out the table of contents for a more in-depth look at what's covered.

The second half, to be made available in the next beta release, will feature complete coverage of

If you buy the PDF (or PDF+Paper combo) now, you'll get access to updated versions of the book as they're made available, plus a copy of the final version once it's released.

Prototype and is destined to become the bible of Prototype developers, so have a look at the sample chapters and purchase your beta copy today! :)