# Re: final/closed classes in Ruby (was: Sharp knives and glue

**URL:** <https://www.ruby-forum.com/t/re-final-closed-classes-in-ruby-was-sharp-knives-and-glue/94717>\
**Category:** Ruby\
**Created:** [May 11, 2006, 11:47pm UTC](https://www.ruby-forum.com/t/re-final-closed-classes-in-ruby-was-sharp-knives-and-glue/94717 "2006-05-11T23:47:00Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![BergerS\_Daniel](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/bc8723/32.png) [@BergerS\_Daniel](https://www.ruby-forum.com/u/BergerS_Daniel)\
**Post date:** [May 11, 2006, 11:47pm UTC](https://www.ruby-forum.com/t/re-final-closed-classes-in-ruby-was-sharp-knives-and-glue/94717/1 "2006-05-11T23:47:00Z")

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> -----Original Message-----  
> From: Gregory S. [[mailto:removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)]  
> Sent: Thursday, May 11, 2006 3:39 PM  
> To: ruby-talk ML  
> Subject: Re: final/closed classes in Ruby (was: Sharp knives and glue)

> class Foo  
> def test  
> puts “hello”  
> end  
> freeze #this already exists and does what you want  
> end

Well, I’ll be damned. I didn’t know you could do that. You learn  
something knew every day I guess. 🙂

Doesn’t prevent subclassing though. 🙂

Thanks,

Dan

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**Author:** ![BergerS\_Daniel](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/bc8723/32.png) [@BergerS\_Daniel](https://www.ruby-forum.com/u/BergerS_Daniel)\
**Post date:** [May 11, 2006, 11:50pm UTC](https://www.ruby-forum.com/t/re-final-closed-classes-in-ruby-was-sharp-knives-and-glue/94717/2 "2006-05-11T23:50:11Z")

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On 5/11/06, Berger, Daniel [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote:

> > def test  
> > Thanks,
> 
> Dan

But any solution you can put into place with pure ruby, can be  
circumvented  
just as easily. 🙂