store provition2 - fundamentals

function printStock(stock, orderedProducts) {
    let currentStock = {};

    stock.forEach((e, index) => {
        if (index % 2 == 0) {
            if (!currentStock[e]) {
                currentStock[e] = Number(stock[index + 1]);
            } else {
                currentStock[e] += Number(stock[index + 1]);
            }
        }
    });

    orderedProducts.forEach((el, index) => {
        if (index % 2 == 0) {
            if (!currentStock[el]) {
                currentStock[el] = Number(orderedProducts[index + 1]);
            } else {
                currentStock[el] += Number(orderedProducts[index + 1]);
            }
        }
    });

    Object.keys(currentStock)
        .forEach(product => console.log(`${product} -> ${currentStock[product]}`));
}