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glennpratt/undefined.irb

Created January 16, 2014 17:10
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undefined.irb
2.0.0p353 :015 > foo.nil?
NameError: undefined local variable or method `foo' for main:Object
from (irb):15
from /usr/local/.rvm/rubies/ruby-2.0.0-p353/bin/irb:12:in `<main>'
2.0.0p353 :016 > @foo.nil?
=> true
2.0.0p353 :017 > @@foo.nil?
(irb):17: warning: class variable access from toplevel
NameError: uninitialized class variable @@foo in Object
from (irb):17
from /usr/local/.rvm/rubies/ruby-2.0.0-p353/bin/irb:12:in `<main>'
2.0.0p353 :018 >
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