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    it IS the NOT operator. MInd to show the whole code? I guess this isn't a function declaration but rather an IIFE... Commented Feb 5, 2014 at 3:51
  • 1
    Are you sure that it's not something like !function(){...return bool;}() Commented Feb 5, 2014 at 3:51
  • @p.s.w.g: it shouldn't return boolean Commented Feb 5, 2014 at 3:53
  • Guess that's meant to be pseudo-code, but trueor falsewould do better, yes. Commented Feb 5, 2014 at 3:53
  • For context, the code is on github. If you understand what minification does, then I wouldn't question seemingly obscure syntax. Commented Feb 5, 2014 at 3:54