Discussion on: Code Challenge: Follow the Dirty Money

const
  visitedLinks = new Set(),
  visitedIds = new Set(); // Just in case somebody gets tricky and adds unique links that have duplicate IDs

async function visitLink(link) {
  let total = 0;

  if (!visitedLinks.has(link)) {
    visitedLinks.add(link);

    const { id, content, links } = await (await fetch(link)).json();

    if (!visitedIds.has(id)) {
      visitedIds.add(id);

      total += parseFloat(
        content
          .match(/\$[\d,]+(?:[,.]\d+)?/)[0]
          .substring(1)
          .replace(',', '.')
      );

      for (const link of links) {
        total += await visitLink(link);
      }
    }
  }

  return total;
}

visitLink(
  'https://gist.githubusercontent.com/jorinvo/6f68380dd07e5db3cf5fd48b2465bb04/raw/c02b1e0b45ecb2e54b36e4410d0631a66d474323/fd0d929f-966f-4d1a-89cd-feee5a1c5347.json'
).then(console.log); // 9064.78999999999 (JS rounding errors, yay)