From: Park Heesob <phasis@...>
Date: 2002-06-05T14:00:31+09:00
Subject: Re: Dynamic local variables ?

"Han Holl" <han@pobox.com> wrote in message
news:3CFD3100.3010404@pobox.com...
>
> Is it possible at all to generate local variables dynamically ?
> What I need is  roughly this:
> I read in a file with one or more multidimensional hashes:
>
>   table = Tabel.new("/tmp/rubdefs.text")
>   puts table["rub"]["T"]["datumontvangst"]
>
> I want to access this as:
>   rub["T"]["datumontvangst"]
>

Hi,


I think PHP's extract and compact function is useful.

extract --  Import variables into the current symbol table from an array
compact --  Create array containing variables and their values

I implemented with ruby using global variable.

def extract(hash)
  hash.each do |key,value|
     eval "$#{key} = #{value.inspect}"
  end
end

def compact(*arg)
   hash = {}
   arg.each do |key|
        hash[key] = eval "$#{key}"
   end
   hash
end

var_hash = {"color" => "blue", "size"  => "medium", "shape" => "sphere"}
extract(var_hash)
puts $color, $size, $shape,"\n"

var_hash2 = compact('color','size','shape')


Park Heesob.