code: function difference () {
                      var arrays   = libs.object.only(libs.object.toArray(arguments), 'array'),
                          diff     = [],
                          allItems = [],
                          i;
  
                      for(i = 0; i < arrays.length; i++) allItems = allItems.concat(arrays[i]);
  
                      for(i = 0; i < allItems.length; i++) {
                          var inArray = -1, unique = false;
  
                          for(var n = 0; n < arrays.length; n++) {
                              if(inArray === -1 && arrays[n].indexOf(allItems[i]) > -1) {
                                  inArray = n;
                                  unique  = true;
                              }
                              else if(inArray !== -1 && arrays[n].indexOf(allItems[i]) > -1) {
                                  inArray = n;
                                  unique  = false;
                              }
                          }
                          if(inArray !== -1 && unique) diff.push(allItems[i]);
                      }
  
                      return diff;
                  }
docs: Returns all the items unique to a single array (the set difference).
  @param {...Array} arrays The Array objects to operate on.
  @param {Array} other The array to compute the difference from.
  @return {Array} A new array with items unique to each array.