whole_func_string: function _filterByExtension(extension, item) {
      if (item.extension.toUpperCase() === extension.toUpperCase()) {
        return true;
      }
      return false;
    }
func_code_string: function _filterByExtension(extension, item) {
      if (item.extension.toUpperCase() === extension.toUpperCase()) {
        return true;
      }
      return false;
    }
func_documentation_string: Filter array of data by extension
  extension {String}
  item {Object}
  @return {Boolean}