15.js

function renderPlainText(reportData, recommendList) {
  let report = `name: ${reportData.userName}\n`;
  report += '-----\n';
  for (let book of reportData.readBooks) {
    if (book.times >= 1) {
      report += `  - ${book.name}: ${book.point} point\n`;
    }
  }
  report += '-----\n';
  report += `total: ${total()} point`;
  return report;

  function total() {
    return reportData.readBooks
      .reduce((total, book) => total + book.point, 0);
  }
}