javascript function leading bang ! syntax

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Ideally you should be able to do all this simply as:

function(){
  // do stuff
}();

That means declare anonymous function and execute it. But that will not work due to specifics of JS grammar.

So shortest form of achieving this is to use some expression e.g. UnaryExpression (and so CallExpression):

!function(){
  // do stuff
}();

Or for the fun: 

-function(){
  // do stuff
}();

Or: 

+function(){
  // do stuff
}();

Or even:

~function(){
  // do stuff
  return 0;
}( );

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