code: function join(separator, itemList) {
      var result = "";
      for (var i = 0; i < itemList.length; i++) {
          if (i > 0) {
              result += separator;
          }
          result += itemList[i];
      }
      return result;
  }
docs: Joins items to one string.
  
  @function join
  
  @param {String} separator The separator.
  @param {Array} itemList The list of items.
  
  @return {String} The joined string.