Using &block as constructor

block_constructor.rb

# &block constructors
# From http://www.deploymentzone.com/2011/06/23/block-constructors

# If you need a behavior like this in your class:
Person.new do |p|
  p.first_name = "John"
  p.last_name = "Brown"
  p.dob = Date.parse("5/9/1800")
end

# You can achieve it with this snippet:
class Person
  attr_accessor :first_name, :last_name, :dob

  def initialize
    yield self if block_given?
  end
end