Reactive HTML parsing

hnparse.js

const ch = require("cheerio");
const fetch = require("node-fetch").default;

const getLeadingNum = (v) => parseInt(v.split(" ")[0], 10);

function HNParser(html) {
  if (! (this instanceof HNParser)) {
    return new HNParser(html);
  }
  this.html = html;
}
HNParser.prototype = {
  get doc() {
    return ch(this.html);
  },
  get hnmain() {
    return ch(this.doc.find("#hnmain")[0]);
  },
  get body() {
    return this.hnmain.find(".itemlist tr.athing");
  },
  get titles() {
    return this.body.map(function () {
      const cheery = ch(this);
      const nextEl = cheery.next();
      const storylink = cheery.find(".title .storylink");
      return {
        href: storylink.attr("href"),
        title: storylink.text(),
        score: getLeadingNum(nextEl.find(".score").text()),
        age: getLeadingNum(nextEl.find(".age").text()),
        comments: getLeadingNum(
          nextEl.find(".age").next().next().next().text()
        ),
      };
    });
  },
};

fetch("https://news.ycombinator.com")
  .then((v) => v.text())
  .then(HNParser)
  .then(({titles}) =>
    titles.each(function () {
      const { href, title, score, age, comments } = this;
      console.log(`${title}
  ${href}
  score: ${score} age: ${age} comments: ${comments}`);
    })
  );