IIFE variations

IIFE.js

// 1
( function IIFE(){/*...*/} )();
// 2
( function IIFE(){/*...*/}() );
// 3
( function(){/*...*/} )();
// 4
( function IIFE( global ){/*...*/} )( window );
// 5
( function IIFE( undefined ){ 
  var a;
  if( a === undefined ){/*...*/}
} )();
// 6
( function( def ){
  def( window );
} )( function def( global ){/*...*/} );