Percentage distribution of my comic collection

collection-distribution.js

const groupings = [
  'Star Wars',
  'Martha Washington',
  'Rick and Morty',
  'James Bond',
  'Star Trek',
];

const _ = require("lodash");
const lofcg = require("leagueofcomicgeeks");

const myUserId = 26853; // alistairjcbrown

lofcg.collection.get(
  myUserId,
  { type: lofcg.types.SERIES },
  (err, collection) => {
    if (err) {
      console.log("An error has occurred getting collection:", err);
      return;
    }

    const distribution = _.reduce(collection, function(buckets, series) {
      const matchingGrouping = _.find(groupings, (grouping) => series.name.toLowerCase().includes(grouping.toLowerCase()));
      const key = matchingGrouping || 'other';
      buckets[key] = buckets[key] || [];
      buckets[key].push(series);
      return buckets;
    }, {})

    const stats = _.reduce(distribution, function(result, matchedSeries, key) {
      result[key] = result[key] || 0;
      result[key] += _.sumBy(matchedSeries, 'count');
      return result;
    }, {});

    const totalComics = _.sum(_.values(stats));
    console.log('totalComics', totalComics);
    _.each(stats, function(count, series) {
      console.log(`Group ${_.padEnd(series+':', 20)}${_.padStart(count, 4)} [${Math.round(count/totalComics*100)}%]`)
    });
  }
);