mixin1.rb

# how do you mix module "Mixin" into class Charlie, such that I can call Charlie.method1? 

module Mixin
  def method1
    "method1"
  end
end

class Charlie
  include Mixin

  def self.method1
    Charlie.new.method1
  end
end


p Charlie.method1

mixin2.rb

# How do you mix module "Mixin" into Charlie, such that I can call method1 as Charlie.new.method1?

module Mixin
  def method1
    "method1"
  end
end

class Charlie
  include Mixin
end


p Charlie.new.method1

mixin3.rb

# Part 2

module Mixin
  def self.method1
    "method1"
  end

  def method1
    Mixin.method1
  end
end

class Charlie
  include Mixin

  def self.method1
    Charlie.new.method1
  end
end

p Charlie.new.method1
p Charlie.method1

mixin1.rb

Kirk you took the long way on this one -- all you need to do is this:

module Mixin
  def method1
    'method1'
  end
end

class Charlie
  extend Mixin
end

mixin2.rb
good!

mixin3.rb

So close! You made the same mistake as you made on mixin1.rb; otherwise, this is the idiom i was looking for. Treat Mixin's self.method1 as a sort of private method to the module, then make a method called method1 in Mixin, that calls self.method1. Nice! But burn "extended" into your brain!