gistfile1.rb

class MyGroup
  def initialize
    @all = []
  end
  
  def add(thing)
    @all << thing
  end
  
  def each
    return to_enum(:each) unless block_given?
    yield @all
  end
end

asdf = MyGroup.new
asdf.add "hello"

asdf.each { |x| puts x }