We just updated the CLOS page on the Common Lisp Cookbook. You should refer to it for updates.CLOS is the “Common Lisp Object System”, arguably one of the most powerful object systems available in any language.Some of its features include: it is dynamic, making it a joy to work with in a Lisp REPL. For example, changing a class definition will update the existing objects, given certain rules which we have control upon.
