renya_geek.rb

# encoding: UTF-8

require 'singleton'

class Cats
  include Singleton
  def initialize
    @cat = { name: 'Alice', sex: 'F' }
  end

  def ask(msg)
    puts msg
  end

  # def get_from_cat(key)
  #   @cat[key.to_sym]
  # end
end

Cats.instance.ask('myaaaooo!')

# only hard coree!!
puts Cats.instance.instance_eval { @cat[:name] }