From: email55555 email55555 <email55555@...>
Date: 2004-12-09T09:43:05+09:00
Subject: Re: binding question

I am learning Tk from the book "Practical Programming in Tcl and Tk".
I try to translate the book's examples from Tcl to Ruby. (as exercice
for myself)

Here is one of kind example: (TCL)

foreach name {one two three four five} {
  label .$name -text $name -bg white
  pack .$name -side top
}
pack .five -before .one


Ruby version: (Of course, there are many ways to write it)

%w[one two three four five].each {|name| ??? =
TkLabel.new(:text=>name, :bg=>'white') { pack(:side=>:top) } }
Tk.pack five, :before=>one  ## trouble... "five", "one" are not local variables.

As you can see, the problem is how can I create local variable one,
two ... five
to correspond the 5 TkLabels immediately (dynamically)?  ( what to
replace the ??? )

So, I came out by using eval binding to force automatically create
local variables base on it name.
Unfortunately, it does not work.

So, what's your suggestion? Do not using array ? write them one by one ?
or ...

variables = %w[one two three four five].map {|e|
TkLabel.new(:text=>name, :bg=>'white') {pack(:side=>:top)}}
Tk.pack variable[4] :before=>variables[0]