1 # coding: utf-8
 2 
 3 class Parent
 4     def hi()
 5         puts "hi"
 6     end
 7 end
 8 
 9 module Mixinable
10     def hey()
11         puts "hey"
12     end
13 end
14 
15 class Child < Parent
16     include Mixinable
17 
18     def hello()
19         puts "hello"
20     end
21 end
22 
23 instance = Child.new
24 instance.hello
25 instance.hey
26 instance.hi

1 class << instance
2     def instance_singleton_method_one
3         puts "instance_singleton_method_one"
4     end
5 end
6 
7 instance.instance_singleton_method_one

1 def instance.instance_singleton_method_two
2     puts "instance_singleton_method_two"
3 end
4 
5 instance.instance_singleton_method_two

1 class Child
2     def child_method_one()
3         puts "child_method_one"
4     end
5 end
6 
7 instance.child_method_one

1 class Child
2     def Child.child_class_method_one()
3         puts "child_class_method_one"
4     end
5 end
6 
7 Child.child_class_method_one

1 class Child
2     def self.child_class_method_two()
3         puts "child_class_method_two"
4     end
5 end
6 
7 Child.child_class_method_two

1 def Child.child_class_method_three
2     puts "child_class_method_three"
3 end
4 
5 Child.child_class_method_three

1 class << Child
2     def child_class_method_four()
3         puts "child_class_method_four"
4     end
5 end
6 
7 Child.child_class_method_four