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  1. or download this
    >>> !! 0
false
>>> !! "0"
true
  2. or download this
    >>> not not 0
False
>>> not not "0"
True
  3. or download this
    irb(main):002:0> !! 0
=> true
irb(main):003:0> !! "0"
(irb):3: warning: string literal in condition
=> true
  4. or download this
      DB<102> !! 0
 => ""

  DB<103> !! "0"
 => ""