プログラミング民に聞きたいんだが、変数名とか普通に日本語でよくないか？？

// Calculate billing amount from customer information
function calculateBillingAmount(customer) {
let totalAmount = 0;
for (const order of customer.orderHistory) {
if (order.isCanceled) {
continue;
}
const priceWithoutTax = order.unitPrice * order.quantity;
const consumptionTax = priceWithoutTax * 0.1;
totalAmount += priceWithoutTax + consumptionTax;
}

// Rounding down
const finalBillingAmount = Math.floor(totalAmount);
return finalBillingAmount;
}

const aCustomer = {
name: “Taro Yamada”,
orderHistory: [
{ unitPrice: 1000, quantity: 2, isCanceled: false },
{ unitPrice: 500, quantity: 1, isCanceled: true },
{ unitPrice: 300, quantity: 5, isCanceled: false },
],
};

console.log(`Billing amount for ${aCustomer.name}: ${calculateBillingAmount(aCustomer)} JPY`);