singleton_method

singleton_method means object’s specific method

when we define method on specific object, will insert the singleton class between object and his class.

1. puts example2. class  
2.   
3. class  << example2  
4.   puts  self  
5. end  

輸出結果：

1. ExampleClass  
2. #<Class:#<ExampleClass:0x28305d>>  

And if we add class method on class just like add singleton method on class