From: Guoliang Cao <caogl@...>
Date: 2008-05-20T05:28:06+09:00
Subject: Method as first class member

Hi,

I don't consider myself a ruby guru but have been a ruby user for a few
years. Since ruby 1.9 is out but its feature set is not finalized, guess
it's ok to voice my opinions on what may be interesting to a joe user.

Currently Ruby has 2 kinds of callable block - proc and lambda, which
are slightly different on semantics. Other than those, is it possible to
make methods work similarly (maybe like a lambda plus an implicit self
parameter)? This will make it closer to the statement "everything is an
object" - a method is an object too. This also makes Ruby a next level
functional language I guess. To refer to the method object, we probably
can use syntax like this:

m = obj->do_something
m[1,2,3]

m = Dir->pwd
m[]

Method object may work similar to lambda and be passed as parameter.
Down the way, partial invocation can be added by associating a context
to the method object and memorizing parameter values. i.e.

m = obj->do_something 1,2,3
m[]


What do you guys think? any comments are welcome.

Regards,
Guoliang

btw, I know ruby-core is the place to post but I don't have permission.
I wonder how the permission is granted, by number of posts?
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