Syntax coding kata

index.js

const FeedParser = require("feedparser");
const request = require("request");

const feedRequest = request("https://feed.syntax.fm/rss");
const feedparser = new FeedParser();

feedRequest.on("response", function(res) {
  var stream = this;

  if (res.statusCode !== 200) {
    this.emit("error", new Error("Bad status code"));
  } else {
    stream.pipe(feedparser);
  }
});

const data = new Promise(resolve => {
  const result = [];
  feedparser.on("readable", function() {
    let stream = this;
    let item;
    while ((item = stream.read())) {
      result.push(item);
    }
  });

  feedparser.on("end", () => resolve(result));
});

data
  .then(map(getItunesDuration))
  .then(map(toMinutes))
  .then(sum)
  .then(Math.round)
  .then(console.log);

function map(fn) {
  return list => list.map(fn);
}

function getItunesDuration(data) {
  if (!data["itunes:duration"]) return "0:0:0";
  return data["itunes:duration"]["#"];
}

function toMinutes(duration) {
  const parsedDuration = duration.split(":").map(n => parseInt(n, 10));
  while (parsedDuration.length < 3) parsedDuration.unshift(0);
  const [hours, minutes, seconds] = parsedDuration;
  return hours * 60 + minutes + seconds / 60;
}

function sum(list) {
  return list.reduce((acc, v) => acc + v, 0);
}

output.txt

5220