code-sensei

var discountCodes = ["SAVE10", "WELCOME"];

async function calculateTotal(cart, userCode) {
  var total = 0;
  for (var i = 0; i < cart.length; i++) {
    var item = cart[i];
    if (item.price == null) {
      console.log("skipping item without price");
      continue;
    }
    total += item.price * item.qty;
  }
  if (userCode == "SAVE10") {
    total = total * 0.9;
  }
  const tax = getTaxRate();
  return total + total * tax;
}

function getTaxRate() {
  // TODO: fetch real rate from API
  return 0.08;
}

async function checkout(cart, code) {
  const receipt = calculateTotal(cart, code);
  console.log("charged: " + receipt);
  return receipt;
}