From: "David A. Black" <dblack@...>
Date: 2003-12-15T21:35:14+09:00
Subject: Re: Q: How to convert hashed parameters to local variables?

Hi --

On Mon, 15 Dec 2003, ts wrote:

> >>>>> "D" == David A Black <dblack@wobblini.net> writes:
> 
> D> No it doesn't.  Well, strictly speaking it does, since "current
> D> scope" means its own block, which it then exits causing the
> D> variables to go out of scope.  But if by "current scope" you mean
> D> the scope from which eval was called, then, as my example shows,
> D> the variables are not created in that scope.  
> 
>  not understood, sorry
> 
> svg% cat b.rb
> #!/usr/bin/ruby
> args = { "a" => "hello" }
> str = ""
> args.each do |key,val|
>    str << "#{key}='#{val}'\n"
> end
> eval str
> eval 'puts a'
> svg%
>  
> svg% b.rb
> hello

I was saying that if you do

  puts a

instead of

  eval 'puts a'

'a' will not be known.  This was in response to Greg's post.

Mind you, I forgot about the fact that you can re-eval 'a' and get
back the same 'a' -- but here the goal was to create variables at the
scope surrounding the eval, not in the eval block itself.


David

-- 
David A. Black
dblack@wobblini.net