const product = {
  name: "Laptop",
  price: 1299,
  stock: 42,
  discount: 0,
  category: "Electronics",
};

const filtered = Object.entries(product)
  .filter(([key, value]) => Boolean(value))
  .reduce((acc, [key, value]) => {
    acc[key] = value;
    return acc;
  }, {});

console.log(Object.keys(filtered).length);
console.log(Object.values(filtered).includes(0));
console.log(Object.keys(filtered).join(", "));