# No yielding

class Person
  attr_accessor :first, :last
  def initialize(first, last)
    @first = first
    @last = last
  end
  def hello
    puts "#{@first} #{@last} says hello!"
  end
end

martin = Person.new("Martin", "Heimbring")
martin.hello # Martin Heimbring says hello!

martin = Person.new
martin.first = "Martin"
martin.last = "Heimbring"
martin.hello # Martin Heimbring says hello!


class YieldPerson
  attr_accessor :first, :last
  def initialize(first, last)
    @first = first
    @last = last
    yield self if block_given?
  end
  def hello
    puts "#{@first} #{@last} says hello!"
  end
end

# While both of the previous ways work, so does this...
YieldPerson.new do |p|
  p.first = "Martin"
  p.last = "Heimbring"
  p.hello # Martin Heimbring says hello!
end