From: ts <decoux@...>
Date: 2001-11-22T15:13:28+09:00
Subject: [ruby-talk:26113] Re: What am I missing here?

>>>>> "R" == Ralph Mason <ralph.mason@telogis.com> writes:

R> What am  I missing here?

 $_ (like $~) is a local and thread local variable.

R> irb(main):001:0> $_= "ruby"
R> "ruby"
R> irb(main):002:0> module Kernel ; def upcase ; $_.upcase! ; end ; end

 Inside #upcase $_ is nil because it was never assigned.

Guy Decoux