From: Kent Dahl <kentda@...>
Date: 2002-12-17T17:25:00+09:00
Subject: Re: Deep copy in Rub?

Matt Armstrong wrote:
> In addition to the other answers, there are two methods to copy an
> object in Ruby.  Object.dup and Object.clone.
> 
> I'm not sure why -- they don't do anything different in the standard
> classes.  The Pickaxe book says they might do something different in
> derived classes, but stops short of suggesting a practice (e.g. clone
> does deep copy and dup does shallow copy).

There are differences:

[kentda@v052a kentda]$ irb
irb(main):001:0> a = "Hi"
"Hi"
irb(main):002:0> a.freeze
"Hi"
irb(main):003:0> a.dup.frozen?
false
irb(main):004:0> a.clone.frozen?
true


-- 
(\[ Kent Dahl ]/)_    _~_    __[ http://www.stud.ntnu.no/~kentda/ ]___/~
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