code: function(elements, b) {
          var a = [],
          elements = elements || slice(this);
          elements.forEach(function(el) {
              // question the support of [].indexOf in older mobiles (RS will bring up 5800 to test)
              if (a.indexOf(el, 0, b) < 0)
              a.push(el);
          });
  
          return a;
      }
docs: reduce
  ------
  
  Reduces the set of elements in the xui object to a unique set.
  
  ### syntax ###
  
  x$( window ).reduce( elements, index );
  
  ### arguments ###
  
  - elements `Array` is an array of elements to reduce _(optional)_.
  - index `Number` is the last array index to include in the reduction. If unspecified, it will reduce all elements _(optional)_.