From: Chad Perrin <code@...>
Date: 2011-05-29T09:51:01+09:00
Subject: Re: Method that mutates object

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On Sun, May 29, 2011 at 09:29:41AM +0900, Gary Wright wrote:
>=20
> My main point was that 'immutable' is the wrong term to apply to
> fixnum objects (and all other objects) in Ruby.  You can add instance
> variables to anything.

I must be doing something wrong, then:

    irb(main):001:0> module Mod
    irb(main):002:1> end
    =3D> nil
    irb(main):003:0> bar =3D 'bar'
    =3D> "bar"
    irb(main):004:0> bar.extend Mod
    =3D> "bar"
    irb(main):005:0> foo =3D 1
    =3D> 1
    irb(main):006:0> foo.extend Mod
    TypeError: can't define singleton
            from (irb):6:in `extend_object'
            from (irb):6:in `extend'
            from (irb):6
            from /usr/bin/irb1.9.1:12:in `<main>'

=2E . . and I haven't even tried adding an instance variable to that module
yet.  How should I add an instance variable to my fixnum object if not
with extend?

--=20
Chad Perrin [ original content licensed OWL: http://owl.apotheon.org ]

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