From: dblack@...
Date: 2003-09-25T12:15:22+09:00
Subject: Re: value binding and function binding

Hi --

On Thu, 25 Sep 2003, Vivek Nallur wrote:

> Hi
>
> I was just wandering through some lisp code and I saw this:
> (let ((x 1))
> 	(flet ((x (y) (+ x y)))
> 		(x x)))
>
> (I'm not sure if the indentation came out properly)
>
> A transliteration(?) of this code gave me an error!
>
> [nvivek@indus nvivek]$ cat t.rb
> x = 1;
> def x (y)

At this point, your x variable is out of scope, so this:

>   x += y

gives you that error (because here, x is uninitialized).

> end
> x x
>
> [nvivek@indus nvivek]$ ruby t.rb
> t.rb:3:in `x': undefined method `+' for nil:NilClass (NoMethodError)
>         from t.rb:5
>
> All I want to do is to check if ruby supports the same identifier having
> both a value binding as well as a function binding.

Yes, both inside and outside the method (separately):

  ruby -e 'def x(y); x = y; puts x; end; x = 1; x x'
  =>  1


David

-- 
David Alan Black
home: dblack@superlink.net
work: blackdav@shu.edu
Web:  http://pirate.shu.edu/~blackdav