03. Store Provision

function printProductAndQuantity(stock, ordered) {
  let collection = {};

  for (let i = 0; i < stock.length; i += 2) {
    // i += 2, за да вземаме по 2 елемента наведнъж
    collection[stock[i]] = Number(stock[i + 1]);
  }

  for (let j = 0; j < ordered.length; j += 2) {
    // проверка, ако стоката се повтаря
    if (Object.keys(collection).includes(ordered[j])) {
      // if (collection.hasOwnProperty(ordered[j])) {
      collection[ordered[j]] += Number(ordered[j + 1]);
    } else {
      collection[ordered[j]] = Number(ordered[j + 1]);
    }
  }

  for (let key in collection) {
    console.log(`${key} -> ${collection[key]}`);
  }
}