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Before: Code with Bug

function calculateTotal(items) {
  let total = 0;
  for (let i = 0; i < items.length; i++) {
    total += items[i].price * items[i].quantity;
  }
  return total;
}

const cart = [
  { id: 1, name: 'T-Shirt', price: 25, quantity: 2 },
  { id: 2, name: 'Shoes', price: 50 }, // Missing quantity!
];

const total = calculateTotal(cart);
console.log(`Total: $${total}`); // NaN due to undefined quantity

After: Fixed Code

function calculateTotal(items) {
  let total = 0;
  for (const item of items) {
    // Add null check and default quantity
    const quantity = item.quantity ?? 1;
    total += item.price * quantity;
  }
  return total;
}

const cart = [
  { id: 1, name: 'T-Shirt', price: 25, quantity: 2 },
  { id: 2, name: 'Shoes', price: 50 }, // Will use default quantity: 1
];

const total = calculateTotal(cart);
console.log(`Total: $${total}`); // $100 (50*1 + 25*2)

AI Analysis

  • Added null check for missing quantity property
  • Implemented default quantity value of 1
  • Used for...of loop for better readability

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