The !! Operator in Javascript

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