pseudocode.js

const transformDAUResponse = (response) => {
  return response.dau;
};

const transformDateForDAUURL = (date) => {
  return `/get/daus/?date=${data}`;
}

const reduceDAUs = (DAUs) => {
  if (DAUs.length == 0) {
    return 0;
  }
  return DAUs.reduce(0, (agg, dau) => agg + dau) / DAUs.length;
};

const retrieveDataForDates = (dates, dateTransformer, responseTransformer, valuesReducer) => {
  const urls = dates.map(date => dateTransformer(date));
  const resultPromises = urls.map(url => await axios.get(url));

  const results = await Promise.all(resultPromises);
  
  const valuesFromResults = results.map(result => responseTransformer(result.data));
  
  return valuesReducer(valuesFromResults);
};


const getDAUStats = (month) => {
  const averageDAUCurrent = await retrieveDataForDates(getListOfDatesForEachDayInMonth(month), transformDateForDAUURL, transformDAUResponse, reduceDAUs);
  const averageDAULast = await retrieveDataForDates(getListOfDatesForEachDayInMonth(month - 1), transformDateForDAUURL, transformDAUResponse, reduceDAUs);

  // Update UI
}