From: Rimantas Liubertas <rimantas@...>
Date: 2008-07-13T10:42:36+09:00
Subject: Re: Modules

>> >> Foo.zim # works, OK, fair enough
>> 2
>> >> Foo::zim # works, but why have two syntaxes that do the same?
>> 2

objec.method works for any object. Everything is an object, so Foo is
an object too.
Class::method, Module::method  works with class/module methods only.

>> >> SomeClass.zim # NoMethodError, huh? Why doesn't this work?
>> >> SomeClass.new.zim # NoMethodError.

Let's take a different angle:

>> class Baz
>> def Baz.qux # class method. you can look at it as a singleton method for Baz
>> 3
>> end
>> end
=> nil

>> Baz.qux
=> 3
>> Baz.new.qux # class method is not available to the instance
NoMethodError: undefined method `qux' for #<Baz:0x35c6f4>
	from (irb):7
	from :0


Thus zim exists only for the object of the Foo module - not any class
that mixes in Foo, just for THE Foo itself.


Regards,
Rimantas
--
http://rimantas.com/