instance_method :fun1 

 1 module Mod1  
 2   def fun1  
 3     puts "Mod1::fun1"  
 4   end  
 5   instance_method :fun1  
 6 end  
 7 module Mod2  
 8   def fun2  
 9     puts "Mod2::fun2"  
10   end  
11   instance_method :fun2  
12 end  
13 class Cls  
14   include Mod1  
15   include Mod2  
16 end  
17 obj = Cls.new  
18 obj.fun1  
19 obj.fun2  

 1 module Mod  
 2   def myFunction  
 3     puts "myFunction"  
 4   end  
 5   module_function :myFunction  
 6   class Class  
 7     def yourFunction  
 8       puts "Mod::Class.yourFunction"  
 9     end  
10   end  
11 end  
12 Mod.myFunction  
13 object = Mod::Class.new  
14 object.yourFunction 

 1 module MyModule 
 2 　　GOODMOOD = "happy" 
 3 　　BADMOOD = "grumpy" 
 4     def greet
 5         return "I'm #{GOODMOOD}. How are you?" 
 6     end 
 7     def MyModule.greet
 8           return "I'm #{BADMOOD}. How are you?" 
 9     end 
10 end

1   def self.greet
2     return "I'm #{BADMOOD}. How are you?"
3   end

MyModule::GOODMOOD

include MyModule 
puts( greet )

1 ob = MyClass.new 
2 ob.sayHi 
3 puts(ob.greet)

 1 module MagicThing
 2   attr_accessor :power
 3 end
 4 
 5 module Treasure
 6   attr_accessor :value
 7   attr_accessor :owner
 8 end
 9 
10 class Weapon
11   attr_accessor :deadliness
12 end
13 
14 class Sword < Weapon
15   include Treasure
16   include MagicThing
17   attr_accessor :name
18 end

1 s = Sword.new
2 s.name = "Excalibur"
3 s.deadliness = "fatal"
4 s.value = 1000
5 s.owner = "Gribbit The Dragon"
6 s.power = "Glows when Orcs Appear"

 1 x = 1 # local to this program
 2 
 3 module Foo
 4   x = 50 # local to module Foo
 5 
 6   # This can be mixed in but the variable x won't then be visible
 7   def no_bar
 8     return x
 9   end
10 
11 
12   def bar
13     @x = 1000
14     return @x
15   end
16 
17   puts("In Foo: x = #{x}") # this can access the „module local‟ x
18 end
19 
20 
21 include Foo
22 
23 puts(x)
24 #puts(no_bar) # Error! This can't access the module-local variable
25       ## needed by the no_bar method
26 puts(bar)