From: matz@... (Yukihiro Matsumoto) Date: 2001-05-16T16:40:44+09:00 Subject: [ruby-talk:15253] Re: class << self Hi, In message "[ruby-talk:15250] Re: class << self" on 01/05/16, Hans-Dieter Stich writes: |btw. i didn't find 'define' and 'undefine' in the pickaxe |book. what do you mean with these two words? does 'undefine' |stand for 'undef_method'? They are "def" and "undef" respectively. Description of "undef" keyword is accidentally ommitted in pixaxe book. It works just like "undef_method". matz.