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Jun 21st, 2018
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  1. leethal@haxxor > irb1.9
  2. irb(main):001:0> defined?(FOO)
  3. => nil
  4. irb(main):002:0> FOO = "bar"
  5. => "bar"
  6. irb(main):003:0> defined?(FOO)
  7. => "constant"
  8. irb(main):004:0>
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