This is an interesting little tidbit in javascript. I came across it while reading Professional AgnularJS by Valeri Karpov and Diego Netto. A quick google search will give you the answer pretty quickly, but to ve you the trouble I've posted my favorite stack overflow answer here:
Coerces oObject to boolean. If it was falsey (e.g. 0, null, undefined, etc.), it will be false, otherwise, true.
!oObject //Inverted boolean
!!oObject //Non inverted boolean so true boolean representation
So !! is not an operator, it's just the ! operator twice.
Original Stack Overflow Post:
http://stackoverflow.com/questions/784929/what-is-the-not-not-operator-in-javascript
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