What is !! in Javascript

Asked Jul 31 '14 at 07:50

Active Jul 31 '14 at 07:50

Viewed 51 times

I am very new to Javascript and came along this line while reverse engineering some code

if (msrc.readyState != 'open' && !!msrc.progressTimer)

var useArg = !!/youtube.com/.exec(url)

[these are not consecutive lines in code]

Can anybody tell what is !! ? Is it some kind of operator or what ?

I tried googling but could not find anything helpful

asked Jul 31 '14 at 07:50

Abhishek Dixit

http://stackoverflow.com/questions/784929/what-is-the-not-not-operator-in-javascript – Adam Jul 31 '14 at 07:52
asked many times before.. http://stackoverflow.com/questions/784929/what-is-the-not-not-operator-in-javascript – webkit Jul 31 '14 at 07:53
1

I remember the first time I encountered truthy and falsey. It's fun! – Andy Novocin Jul 31 '14 at 07:53

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