Retrieving Release Notes of Google Apps Script and Google APIs from RSS using Google Apps Script

function getData_({ urls, before }) {
  const date = new Date();
  date.setDate(date.getDate() - before);
  const dateUnix = date.getTime();
  const reqs = urls.map((url) => ({ url, muteHttpExceptions: true }));
  const res = UrlFetchApp.fetchAll(reqs);
  const values = res.reduce((ar, r) => {
    if (r.getResponseCode() == 200) {
      const xml = XmlService.parse(r.getContentText());
      const root = xml.getRootElement();
      const ns = root.getNamespace();
      const updated = new Date(root.getChild("updated", ns).getValue());
      if (updated.getTime() > dateUnix) {
        const title = root.getChild("title", ns).getValue();
        const entries = root.getChildren("entry", ns).map((e) => {
          const updated = new Date(e.getChild("updated", ns).getValue());
          const href = e.getChild("link", ns).getAttribute("href").getValue();
          const content = e.getChild("content", ns).getValue().trim();
          return [updated, href, content];
        });
        ar = [...ar, ...entries.map((e) => [title, updated, ...e])];
      }
    }
    return ar;
  }, []);
  return values;
}

function putValuesToSpreadsheet_({ values, sheetName }) {
  const sheet = SpreadsheetApp.getActiveSpreadsheet().getSheetByName(sheetName);
  sheet
    .clearContents()
    .getRange(sheet.getLastRow() + 1, 1, values.length, values[0].length)
    .setValues(values);
}

// Please run this function.
function main() {
  const urls = [
    "https://developers.google.com/feeds/apps-script-release-notes.xml",
    "https://developers.google.com/feeds/drive-release-notes.xml",
    "https://developers.google.com/feeds/sheets-release-notes.xml",
    "https://developers.google.com/feeds/docs-release-notes.xml",
    "https://developers.google.com/feeds/slides-release-notes.xml",
    "https://developers.google.com/feeds/forms-release-notes.xml",
    "https://developers.google.com/feeds/calendar-release-notes.xml",
    "https://developers.google.com/feeds/gmail-release-notes.xml",
  ];
  const before = 30; // In this sample, the data from 30 days ago to now is retrieved.
  const sheetName = "Sheet1"; // Please set your sheet name.
  const values = getData_({ urls, before });
  putValuesToSpreadsheet_({ values, sheetName });
}