code: function parse_scan(show_hidden, callback) {
    return function(error, stdout, stderr) {
      if (error) callback(error);
      else
        if (show_hidden) {
          callback(error, stdout
          .split(/Cell [0-9]+ -/)
          .map(parse_cell)
          .filter(has_keys)
          .sort(by_signal));
      } else {
          callback(error, stdout
          .split(/Cell [0-9]+ -/)
          .map(parse_cell)
          .filter(has_ssid)
          .sort(by_signal));
      }
    };
  }
docs: Parses all scanned wireless network cells.
  
  @private
  @static
  @category iwlist
  @param {function} callback The callback function.