Display Spotify streaming stats for your favorite artist (hours, days, and unique songs listened with a list of top tracks). Place this file in the same directory as `MyData` after downloading and unzipping your Spotify data. Customize the constants up top then run with Node.js.

skrrtStats.js

const ARTIST = "Yung Skrrt";    // substitute any artist (ensure exact match)
const TOP_TRACKS = 21;           // number of top trackx to display

// time conversion constants
const MS_IN_HR = 3600000;
const HRS_IN_DAY = 24;

// GOTTA HIT THE STORAGE SPOT, GET UP IN THE STASH!
// retreive and consolidate streaming data
const streams0 = require("./MyData/StreamingHistory0.json");
const streams1 = require("./MyData/StreamingHistory1.json");
const streams = streams0.concat(streams1);

// filter to streams of tracks by artist
const artistStreams = streams.filter(stream => stream.artistName === ARTIST);

// return play duration of all artist streams in milliseconds
function getDuration() {
    let duration = 0;
    artistStreams.forEach(stream => {
        duration += stream.msPlayed;
    });
    return duration;
}

// return duration in hours
function getDurationInHours() {
    return (getDuration()/MS_IN_HR).round();
}

// return duration in days
function getDurationInDays() {
    return (getDuration()/MS_IN_HR/HRS_IN_DAY).round();
}

// return a sorted (descending) Map<trackName, playCount>
function getTracksByPlayCount() {
    const trackCounts = new Map();
    artistStreams.forEach(stream => {
        if (!trackCounts.has(stream.trackName)) {
            trackCounts.set(stream.trackName, 1);
        } else {
            let count = trackCounts.get(stream.trackName);
            count++;
            trackCounts.set(stream.trackName, count);
        }
    });

    const trackRanks = new Map([...trackCounts.entries()].sort((a, b) => b[1] - a[1]));
    return trackRanks;
}

// return a string listing the first n top tracks
function listTopTracks() {
    const trackCounts = getTracksByPlayCount().entries();
    let topTracksList = "";
    let rank = 1;

    for (track of trackCounts) {
        if (rank > TOP_TRACKS) {
            break;
        }
        topTracksList += String(rank).padStart(2, '0') + ". \"" + 
        track[0] + "\" with " + track[1] + " plays \n";
        rank++;
    }

    return topTracksList;
}

// decimal rounding (to hundredths)
Number.prototype.round = function() {
    const num = this;
    return (Math.round(num * 100) / 100).toFixed(2);
}

// string formatter
String.prototype.format = function() {
    var s = this,
        i = arguments.length;

    while (i--) {
        s = s.replace(new RegExp('\\{' + i + '\\}', 'gm'), arguments[i]);
    }
    return s;
};

// STATS UP, STATS UP!
// print artist stats
console.log(
    "\n" + 
    "You listened to {0} for {1} hours. That's {2} days. \n".format(ARTIST, getDurationInHours(), getDurationInDays()) +
    "\n" +
    "You listened to {0} unique {1} songs. \n".format(getTracksByPlayCount().size, ARTIST) +
    "\n" +
    "Your top " + ARTIST + " tracks \n" +
    "--------------------------\n" +
    listTopTracks() +
    "\n"
);