9.js

function generateReadReport(readList, recommendList) {
  return renderPlainText(readList, recommendList);
}

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

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

  function point(readBook) {
    if (readBook.times <= 0) {
      return 0;
    }
    if (notRecommendBook()) {
      return 1;
    }

    if (readBook.times >= 3) {
      return 8;
    } else if (readBook.times === 2) {
      return 5;
    } else if (readBook.times === 1) {
      return 3;
    } else {
      return 0;
    }

    function notRecommendBook() {
      return !recommendList.map(recommend => recommend.asin).includes(readBook.asin);
    }
  }
}

module.exports = generateReadReport;