self_yield.rb

# =================
# Spell: Self Yield
# =================

# Pass self to the current block.

class Person
  attr_accessor :name, :surname

  def initialize
    yield self
  end
end

joe = Person.new do |p|
  p.name = 'Joe'
  p.surname = 'Smith'
end

# For more information: http://www.pragprog.com/titles/ppmetr/metaprogramming-ruby