Elevate Your Code Quality

1function calculateTotal(items) {
2    // Good: Using reduce for summing up values
3    const subtotal = items.reduce((sum, item) => sum + item.price, 0);
4  
5    // Bad: Magic number, should be a named constant
6    const tax = subtotal * 0.1;
7  
8    // Can be improved: Consider using toFixed(2) for currency
9    const total = subtotal + tax;
10  
11    return total;
12  }
13  
14  // Can be improved: Consider adding input validation
15  function applyDiscount(total, discountCode) {
16    if (discountCode === 'SAVE10') {
17      // Bad: Magic number, should be a named constant
18      return total * 0.9;
19    }
20    return total;
21  }