cache_objects.rb

class Person
  def self.new(name)
    @cache ||= {}
    @cache[name] ||= super(name)
  end
  def initialize(name)
    @name = name
  end
end

Person.new(:luis) # => #<Person:0x007fccd432f9d0 @name=:luis>
Person.new(:katalina) # => #<Person:0x007fccd43329c8 @name=:katalina>
Person.new(:luis) # => #<Person:0x007fccd432f9d0 @name=:luis>