From: George Ogata <g_ogata@...>
Date: 2004-04-04T07:09:22+09:00
Subject: Re: [newbie] What is the difference between dup and clone ?

Alexey Verkhovsky <alex_verk@mail.ru> writes:

> OK, clone copies frozen state, and dup doesn't (but both copy tainted) - 
> this much I understand.
>
> But the Rdoc (quoted fully below) hints at some other distinction, saying:
>
> "While clone is used to duplicate an object, including its internal 
> state, dup typically uses the class of the descendent object to create 
> the new instance."

Well, one distinction is that singleton class stuff is `clone'd, but
not `dup'ed:

o = Object.new
class << o
  def scare
    puts 'boo!'
  end
end

o.clone.scare  # ok
o.dup.scare    # NoMethodError

HTH