From: Olivier Renaud <o.renaud@...>
Date: 2007-03-16T00:46:49+09:00
Subject: Re: freeze string fails to freeze ???

Le jeudi 15 mars 2007 16:35, jwaala.amplify@gmail.com a �crit�:
> >> a='asdf'
>
> => "asdf"
>
> >> a.freeze
>
> => "asdf"
>
> >> a='qwer'
>
> => "qwer"
>
> should'nt that throw and exception ???

No, because calling the freeze method prevents from modifying the object, it 
doesn't prevent from modifying the variable. Remember that a variable is just 
a way to give a name to an object, but it is not tied to this object forever.

So, your code doesn't raise an exception, but this one does :

irb(main):001:0> a="abc"
=> "abc"
irb(main):002:0> a.freeze
=> "abc"
irb(main):003:0> a << 'd'
TypeError: can't modify frozen string
        from (irb):3:in `<<'
        from (irb):3

What you are looking for is closer of a constant, actually :

irb(main):004:0> A="abc"
=> "abc"
irb(main):005:0> A="def"
(irb):5: warning: already initialized constant A

-- 
Olivier Renaud