Furniture / JS Advanced

function solve() {
  let textarea = document.querySelectorAll('textarea');
  let tbody = document.querySelector('tbody');

  [...document.querySelectorAll('button')].forEach(btn => btn.addEventListener('click', execute));
  function execute(btn) {
    if (!textarea[0].value) return;
    if (btn.target.textContent === 'Generate') {
      let input = JSON.parse(textarea[0].value);
      input.forEach(furniture => {
        tbody.innerHTML += `<tr>
          <td><img src=${furniture.img}></td>
          <td><p>${furniture.name}</p></td>
          <td><p>${furniture.price}</p></td>
          <td><p>${furniture.decFactor}</p></td>
          <td><input type="checkbox"/></td>
          </tr>`
      })
    } else {
      let furnitureName = [];
      let totalPrice = 0;
      let averageDecFactor = 0;
      [...document.querySelectorAll('input:checked')]
        .forEach(furniture => {
          let parentRow = furniture.parentNode.parentNode;
          averageDecFactor += Number(parentRow.children[3].textContent);
          totalPrice += Number(parentRow.children[2].textContent);
          furnitureName.push(parentRow.children[1].textContent);
        });
      textarea[1].textContent += `Bought furniture: ${furnitureName.join(', ')}\n`;
      textarea[1].textContent += `Total price: ${totalPrice.toFixed(2)}\n`;
      textarea[1].textContent += `Average decoration factor: ${averageDecFactor / furnitureName.length}`;
    }
  }
}