What's !! meaning when used in the of statement?

Question

Such as if(!!you) , I thought we can get rid of the !! , and it's the same. Cause JavaScript will change it to Boolean automatically?

duplicate http://stackoverflow.com/questions/784929/what-is-the-not-not-operator-in-javascript http://stackoverflow.com/questions/9284664/double-exclamation-points — hallie, Jul 15 '15 at 01:15

score 0 · Answer 1 · answered Jul 15 '15 at 01:10

0

!! cast the variable to a Boolean. Similar to how you do +foo to cast it to a number.

answered Jul 15 '15 at 01:10

1 Answers1