object.class.instance_methods # => [:meth1, :meth2,...]
object.instance_variables # => [:@var1, :@var2,..]

object.instance_variables.map { |var| object.instance_variable_get(var) }

module M
  M_constant = "M constant"
  def m_method
    puts "M#m_instance_method"
  end
end

class C
  include M
  attr_accessor :c_instance_variable

  C_constant = "C constant"

  @@c_class_variable = 4

  def self.c_class_method1
    puts "c_class_method1"
  end

  def c_method
    @c_instance_variable = 0
    puts "c_instance_method"
  end

  class << self
    attr_accessor :c_class_instance_variable
    @c_class_instance_variable = 5
    def c_class_method1
      puts "c_class_method1"
    end
  end
end

class D < C
end

M.constants
  #=> [:M_constant]
C.constants
  #=> [:A, :C_constant, :M_constant]
C.constants(false)
  #=> [:A, :C_constant]
D.constants
  #=> [:A, :C_constant, :M_constant]
D.constants(false)
  #=> []

C.class_variables
  #=> [:@@c_class_variable]
C.class_variables(false)
  #=> [:@@c_class_variable]
D.class_variables
  #=> [:@@c_class_variable]
D.class_variables(false)
  #=> []

C.new.instance_variables
  #=> [:@c_instance_variable]
D.new.instance_variables
  #=> []

M.instance_methods
  #=> [:m_instance_method]
C.instance_methods.size
  #=> 57
C.instance_methods(false)
  #=> [:c_instance_variable, :c_instance_variable=, :c_method]
D.instance_methods.size
  #=> 57
D.instance_methods(false)
  #=> []

C.singleton_class.instance_methods.size
  #=> 102
C.singleton_class.instance_methods(false)
  #=> [:c_class_method1, :c_class_instance_variable,
  #    :c_class_instance_variable=]
D.singleton_class.instance_methods.size
  #=> 102
D.singleton_class.instance_methods(false)
  #=> []