From: Markus Gaelli <gaelli@...>
Date: 2006-09-01T08:17:40+09:00
Subject: Fwd: [Q] How would you do method extensions (sometimes called class extensions) in Ruby?



Begin forwarded message:

> From: Markus Gaelli <gaelli@emergent.de>
> Date: September 1, 2006 1:04:50 AM GMT+02:00
> To: ruby-core@ruby-lang.org
> Subject: Re: [Q] How would you do method extensions (sometimes  
> called class extensions) in Ruby?
>
> Sam and Nicolas,
>
> thanks for your fast answers and pointers.
> Guess I have to subscribe to another list - which is a good thing!
> - Just wanted to be sure... ;-)
> (I therefore forward another mail which just happened to arrive in  
> this moment in my squeak mailbox)
>
> On Aug 31, 2006, at 11:44 PM, Sam Roberts wrote:
>
>> On Fri, Sep 01, 2006 at 06:08:11AM +0900, Markus Gaelli wrote:
>>> I am aware of Singleton Methods, but as they can extend instances,
>>> (how) can I extend classes without changing their original class
>>> definition in Ruby?
>>
>> This is probably best posted to ruby-talk, not ruby-core, folks would
>> likely be quite interested.
>>
>> classes are "open" in ruby, you can add methods as you wish.
>>
>> irb(main):001:0> s = "hi"
>> => "hi"
>> irb(main):002:0> class String; def this(opt) puts(self+opt) end end
>> => nil
>> irb(main):003:0> s.this(" that")
>> hi that
>> => nil
>> irb(main):004:0> "bye".this(" that")
>> bye that
>> => nil
>>
>
> I was reading (skimming) the Ruby book of Thomas and Hunt but could  
> not find this. Thanks a lot!
> I appreciate Ruby to be able to extend any class with any methods.
>
> Cheers,
>
> Markus
>
> p.s. Funny that you have "reply" set to the person who answered and  
> not to the list, different than in Squeak and Squeakland...