i have two arrays of objects i need to find the matching id from the first array in the seconde one, right now the code works but i need the elements in the first array CartVar to only be used once so there is no repetition

cart.map((order_item, index) => {
  return (
    <li key={index}>
      <div>
        <a>
          {order_item.title}
        </a>

        <span>
          {CartVar.find((x) => x.id === order_item._id).Quantity} x {order_item.Price}$
        </span>
      </div>
    </li>
  );
})