this seems to work

$ irb
irb(main):001:0> o=Object.new
=> #<Object:0x100e3128>
irb(main):002:0> s="test"
=> "test"
irb(main):003:0> sym=s.to_sym
=> :test
irb(main):004:0> o.instance_eval do
irb(main):005:1* puts s
irb(main):006:1> klass=class<<self;self;end
irb(main):007:1> klass.send(:define_method,sym){puts "#{s}"}
irb(main):008:1> end
test
=> #<Proc:0x003df7d8@(irb):7>
irb(main):009:0> o.test
test
=> nil


On 10/2/06, Luke Stark <Luke.Stark / mathworks.com> wrote:
> Jean,
>
> Hmm. This looks close, but the :test in your example can only be a
> variable that has been defined within the instance_eval...and I need to
> pass one from outside.
>
> The others run, but add the method to the class, rather than the
> instance of that class.
>
> I'm sure there's a simple way. I just can't see it.
>
> -L
>
> > -----Original Message-----
> > From: Jean Helou [mailto:jean.helou / gmail.com]
> > Sent: Monday, October 02, 2006 9:41 AM
> > To: ruby-talk ML
> > Subject: Re: Creating dynamically named singleton methods. Syntax
> > question.
> >
> > However this will define the given method for all new instances of
> > obj.class (MyThing in my example) which are created after this code is
> > executed, which is not what the OP seemed to want.
> >
> > jean
> >
> > ps: in my example :test can be a variable and String.to_sym is your
> > friend.
> >
> > On 10/2/06, Martin Coxall <pseudo.meta / gmail.com> wrote:
> > > On 10/2/06, Jan Svitok <jan.svitok / gmail.com> wrote:
> > > >
> > > > On 10/2/06, Luke Stark <Luke.Stark / mathworks.com> wrote:
> > > > > You may create singleton methods like so:
> > > > >
> > >
> > >
> > > I'll have one more go. This time I'll get it right. ;p
> > >
> > > obj.class.instance_eval do
> > >    define_method(:method_name) do |*args|
> > >       # Method goes here
> > >    end
> > > end
> > >
> > > N.B. this actually works this time, because I tried it.
> > >
> > > Regards,
> > >
> > > Martin
> > >
> > >
>
>
>