«

Hello

If I want to add a method to a class, I can use send as shown below. Is
there a similar way to use send to add a method to an object?

class MyClass
end

MyClass.send(:define_method, oof) {'I say poof!'}

x = MyClass.new
x.poof # => "I say poof!"


I can define an object method as follows:

def x.object_poof
'I say object_poof'
end

x.object_poof # => "I say object_poof"

I would like to use send to define object methods but I have not figured
out how.

Thanks
Dave Miller
--
Posted via http://www.ruby-forum.com/.

Hello,

If you execute your script on Ruby 1.9, you can use
Object#define_singleton_method to add a method to an object.

# --- begin: example ---

class MyClass
end
MyClass.send(:define_method, oof) {'I say poof!'}
x =3D MyClass.new
y =3D MyClass.new

x.define_singleton_method( oof_singleton ) { "Here is in a singleton
method." }
x.poof_singleton #=3D> "Here is in a singleton method."
y.poof_singleton #=3D> NoMethodError

# --- end: example ---

The method Object#define_singleton_method is able to be used on Ruby
1.9, but I couldn't find out its doc...


2010/9/18 David Miller <>:
> Hello
>
> If I want to add a method to a class, I can use send as shown below. =A0I=
s
> there a similar way to use send to add a method to an object?
>
> class MyClass
> end
>
> MyClass.send(:define_method, oof) {'I say poof!'}
>
> x =3D MyClass.new
> x.poof # =3D> "I say poof!"
>
>
> I can define an object method as follows:
>
> def x.object_poof
> =A0'I say object_poof'
> end
>
> x.object_poof # =3D> "I say object_poof"
>
> I would like to use send to define object methods but I have not figured
> out how.
>
> Thanks
> Dave Miller
> --
> Posted via http://www.ruby-forum.com/.
>
>

--=20
NOBUOKA Yuya
e-mail:

David Miller wrote:
> I would like to use send to define object methods but I have not figured
> out how.

There is a magic incantation to get at the singleton class:

object_poof = Object.new
class <<object_poof; self; end.send(:define_method, oof) {'I say
poof!'}
object_poof.poof

I would personally use .class_eval { define_method .. } instead of
send(:define_method ..) but that's just preference.
--
Posted via http://www.ruby-forum.com/.