From: Ja Tse <lists@...>
Date: 2012-08-11T04:53:59+09:00
Subject: Re: Unable to print a block argument.

Thanks, JAn

I the concept was right but I didn't look close enough. I have modified 
it a little bit please see the snippet.

Can you also tell me the name of this pattern as it us used a lot in 
Ruby, and what would be a good use case.

Thanks


'''

class Foo
  attr_accessor :name, :surname, :age

  def initialize( name, surname, age  )
    @name = name
    @surname = surname
    @age = age
  end

  def self.open(foo)
    x = new "foo", "bar", "buzz"
    block_given? ? yield(x) : x
  end

  def len
    @op.length
  end
end

Foo.open("this") do |o|
  puts o.name
  o.surname = "xxxx"
  puts o.surname
  puts o.age
end

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