How to get attributes that were defined through attr_reader or attr_accessor

Question

Suppose I have a class A

class A
  attr_accessor :x, :y

  def initialize(x,y)
    @x, @y = x, y
  end
end

How can I get

Answer 1

class A
  ATTRIBUTES = [:x, :y]
  attr_accessor *ATTRIBUTES

  def initialize(x,y)
    @x, @y = x, y
  end

  def attributes
    ATTRIBUTES.map{|attribute| self.send(attribute) }
  end
end

This may not be the DRY-est, but if you are only concerned with doing this for one class (as opposed to a base class that everything inherits from), then this should work.