if ( typeof define !== "function" ) {
  var define = require( "amdefine" )( module );
}

define( function ( require ) {
  "use strict";

  function guid() {
    return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
      var r = Math.random()*16|0, v = c == 'x' ? r : (r&0x3|0x8);
      return v.toString(16);
    }).toUpperCase();
  }

  return guid;

});