From: Christian Surlykke <christian@...>
Date: 2006-11-12T23:06:44+09:00
Subject: Create local variable in Binding after it's creation

Hi,

Is it possible to create a new local variable in a binding after it's creation?

Specifically, what I'd like to do:

  l = lambda { puts a }  # 'a' not defined at this point.
  eval('a = 7', l.binding)  # Hope to create a in l's binding
  l.call                             # Hope to get '7'

- but that produces:

  NameError: undefined local variable or method `a' for main:Object
          from (irb):1
          from (irb):3:in `call'
          from (irb):3
          from :0

Apparently, 'a' gets created in the scope from where 'eval' was called and not in 'l'''s binding. 

Any suggestions would be most welcome.

best regards 
Christian Surlykke