a_object = [1, { :uno => 1}]

p a_object.class

p a_object.class.superclass

p a_object.instance_of? Object

p a_object.instance_of? Array

p a_object.is_a? Object

p a_object.is_a? Array

p a_object.respond_to? :each

l = Array.instance_methods(false)
p l.length
p l

t = Array.instance_methods(true)
p t.length
p t