On 26 Oct 2008, at 18:30, Joe Blow wrote:
>
> I understand that (class << self; self; end) returns the singelton
> class
> of object that is calling it but why would use that instead of self <<
> MyClass ...?
>
> For example, arent these all equivalent?
>
> class << String
> def foo
> puts "foo"
> end
> end
>
> class String
> class << self
> def foo
> puts "foo"
> end
> end
> end
>
> class String
> (class << self; self; end).module_eval do
> def foo
> puts "foo"
> end
> end
> end
>
> So why would you use the more obscure (class << self; self; end)
> technique? Can someone please explain.
if self isn't a class for example
class Object
def meta
(class << self; self; end)
end
end
x = "123"
x.meta.module_eval do
def foo
puts "foo"
end
end
x.foo
you could of course have just done
def x.foo
puts "foo"
end
but sometimes you want to more than just add a method.
Fred
>
> --
> Posted via http://www.ruby-forum.com/.
>
> >
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