From: Joseph McDonald <joe@...>
Date: 2000-12-08T10:40:05+09:00
Subject: [ruby-talk:6924] Re: Is there any way to undefine a variable?


You an remove it if made in a module:

module A
  Unify = 1
  puts defined? Unify
  remove_const("Unify")   # note quotes around name.
  puts defined? Unify
end

prints:
constant
nil

regards,
-joe


"Steven Grady" <grady@scam.xcf.berkeley.edu> wrote in message
news:90pad3$lvc$1@agate.berkeley.edu...
> I ask because Rational checks whether Unify is defined.  I
> can make it defined easily enough:
>     Unify = 1
>     defined? Unify # -> "constant"
> but I can't figure out how to undefine it:
>     undef Unify # -> NameError: undefined method 'Unify' for class
> # 'Object'
>
> This error is not surprising, since the documentation says that undef
> cancels "the method definition" -- it doesn't say anything about variable
> bindings.  But the question remains: how do I undefine Unify after I've
> defined it?
> --
> Steven
> "`The glorious sunset of my heart was fading.  Soon the Super Karate
> Monkey Death Car would park in my space.'"