Ruby Method Arguments: a new book, from your first call to metaprogramming

A new book on Ruby method arguments that follows one thing all the way down: how a Ruby method receives its arguments. From def greet(name) to keyword arguments, splats, blocks, closures, method_missing , instance_eval , and building a small DSL — with the patterns behind Rails and RSpec rebuilt from scratch. Every example was run before it was printed, and the exercises have self-checking solutions in a free companion repo.