Ruby Singleton methods for class and objects

Question

I am learning Ruby Singletons and i found some ways to define and get list of Class and Object singleton methods.

Class Singleton Methods

Ways to define

Answer 1

Object singleton methods

instance_eval

class A
end

a = A.new

a.instance_eval do
def v 
"asd"
end
end

 a.singleton_methods
 => [:z, :v]