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From: Robert Klemme <shortcutter@googlemail.com>
Newsgroups: comp.lang.ruby
Subject: Re: RubyWart: Missing Name Errors (AGAIN!)
Date: Wed, 01 May 2013 11:27:49 +0200
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On 05/01/2013 07:15 AM, rantingrickjohnson@gmail.com wrote:
> Same bowel movement, different cess pool!
>
> Can someone please explain the logic of having undefined symbols defaul=
t to random values instead of throwing a NameError? Because this is makin=
g me F'ING NUTS PEOPLE!!!!

They don't.  Also, this is not about an undefined Symbol but about an=20
unassigned member variable.

> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>   Code Sample
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> class Foo
>      def foo
>          $stdout.write("@poo =3D #{@poo}\n")
>      end
> end
>
>
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>   Interactive Session
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> rb> f =3D Foo.new
> #<Foo:0x79e6680>
> rb> f.foo
> @poo =3D 7

That output does not come from the code above:

irb(main):001:0> class Foo
irb(main):002:1>     def foo
irb(main):003:2>         $stdout.write("@poo =3D #{@poo}\n")
irb(main):004:2>     end
irb(main):005:1> end
=3D> nil
irb(main):006:0> f =3D Foo.new
=3D> #<Foo:0x8f8bb84>
irb(main):007:0> f.foo
@poo =3D
=3D> 8

What you probably did:

irb(main):001:0> class Foo
irb(main):002:1>     def foo
irb(main):003:2>         $stdout.write("@poo =3D #{@poo}")
irb(main):004:2>     end
irb(main):005:1> end
=3D> nil
irb(main):006:0> f =3D Foo.new
=3D> #<Foo:0x9285344>
irb(main):007:0> f.foo
@poo =3D =3D> 7

Whatever interactive Ruby you used does not print "=3D> " in front of the=
=20
inspect of the last value.  Now you also see why IRB does print this pref=
ix.

> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>   Resulting Emotional State
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> =E0=B2=A0_=E0=B2=A0

It may actually be the other way round.

Kind regards

	robert