This module has revealed to you the mysteries of Ruby's self keyword. Remember that you can think of self as a Ruby program asking the question: "Who am I right now?" It's a special variable that points to the object associated with the code we're currently executing. We walked through how to use it properly. We explored the concept of "monkey patching," the practice of adding methods to or altering Ruby's core classes—which is a great thing to know, but be careful about using it in your programs! We also covered how to use attr_accessor, attr_reader, and attr_writer as needed.

The concept of Ruby's self might be an initially confusing one, but, armed with the knowledge and experience you've gained over the past several lessons, you're prepared to implement it in a variety of future situations.