From: Austin Ziegler <halostatue@...>
Date: 2007-05-18T09:25:39+09:00
Subject: Re: Some Ruby Features missing...

On 5/17/07, edlich@gmail.com <edlich@gmail.com> wrote:
> On 16 Mai, 21:17, "Adriano Ferreira" <a.r.ferre...@gmail.com> wrote:
> > On 5/16/07, edl...@gmail.com <edl...@gmail.com> wrote:
> > As Stefano said, you can modify the methods of a class in Ruby anytime you want.
> > irb> class Foo
> > irb>    attr_accessor :foo # here the conventional accessor is defined
> > irb>
> > irb*    def foo # and here it is overriden
> > irb>        puts "foo invoked"
> > irb>        @foo
> > irb>    end
> > irb> end
> > => nil
> >
> > irb> Foo.new.foo
> > foo invoked
> > => nil
> Unfortunately this is not at runtime.

That's not true.

class Foo; end
Foo.new.foo # raises an exception
class Foo; def foo; "hello"; end; end
Foo.new.foo # "hello"

If you want to modify just an object, then just do so:

class Bar; end
foo = Bar.new
foo.baz # exception
class << bar; def baz; "hello"; end; end
foo.baz # "hello"

Better:

module BazMethod; def baz; "hello"; end; end
foo = Bar.new
foo.extend(BazMethod)
foo.baz # "hello"

There is no separate compile time in Ruby.

-austin
-- 
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