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The Code (from ChatGPT)

JavaScript

function processOrder(items, customer, promoCode) {
  let subtotal = 0;
  for (const item of items) {
    subtotal += item.price * item.quantity;
  }
  
  let discount = 0;
  if (promoCode === 'SAVE10') {
    discount = subtotal * 0.10;
  } else if (promoCode === 'SAVE20') {
    discount = subtotal * 0.20;
  }
  
  const tax = (subtotal - discount) * customer.taxRate;
  const shipping = subtotal > 100 ? 0 : 9.99;
  const total = subtotal - discount + tax + shipping;
  
  return {
    subtotal,
    discount,
    tax,
    shipping,
    total,
    estimatedDeliveryDays: Math.ceil(customer.distance / 100)
  };
}

This e-commerce order processing function looks correct, but it has hidden bugs that could crash your checkout in production.