promise.js

parseXmlStringAsync(response.text)
  .then((result) => {
    var entryList = [];
    _.forEach(result.feed.datastream, (val) => {
        if (idList.indexOf(Number(val['$']['id'])) > -1) {
            var entry = {
                'ID': Number(val['$']['id']),
                'timestamp': Number(new Date(val.current_time[0]).getTime()),
                'currentvalue': Number(val.current_value[0]),
                'maxvalue': Number(val.max_value[0])
            };

            entryList.push(entry);
        }
    });

    return tdxApi.addDatasetDataAsync(packageParams.parkDataTable, entryList)
  })
  .then(() => {
    // If we get here, there were no errors.
    output.debug("Added data to the dataset");
    return ({error: false});
  })
  .catch((err) => {
    // Catch any errors here, report them, then continue.
    output.error("Failure processing entries: %s", err.message);
    return ({error: true});
  })
  .then((resArr) => {
    return cb(resArr);
  });
}