// Avoid
let c = 10; // Avoid using single-letter variable names
let func = () => {
    // Complex logic without explanation
};

// Prefer
const itemCount = 10; // Use descriptive variable names
const calculateTotal = () => {
    // Clear function name and comments for complex logic
};

def calculate_discount(price):
  TEN_PERCENT_DISCOUNT = 0.1
  discount = price * TEN_PERCENT_DISCOUNT
  return price - discount

def calculate_discount(product_price):
  """Calculate discount for product.

   Warning: Certain characters might not be handled correctly.
   Please refer to the documentation for supported formats.

   Args:
       product_price (float): The price of the product.

   Returns:
       Float: The calculated discount price. 

   Raises:
       ValueError: If the product price is invalid or unsupported.
  """
  TEN_PERCENT_DISCOUNT = 0.1
  discount_amount = product_price * TEN_PERCENT_DISCOUNT
  return product_price - discount_amount

// Avoid
const handleUserData = () => {
    // Performs multiple tasks: fetches data, processes it, and updates UI
};

// Prefer
const fetchData = () => {
    // Responsible for fetching data
};
const processData = (data) => {
    // Responsible for processing data
};
const updateUI = (processedData) => {
    // Responsible for updating the UI
};

def process_data(data):
   # ... validate users...
   # ... calculate values ...
   # ... format output …

def validate_user(data):
   # ... data validation logic ...
def calculate_values(data):
   # ... calculation logic based on validated data ...
def format_output(data):
   # ... format results for display …

// Avoid
if (status === 2) {
    // What does 2 signify?
    // ...
}

// Prefer
const STATUS_COMPLETED = 2;
if (status === STATUS_COMPLETED) {
    // Clear and self-explanatory
    // ...        
}

def calculate_book_price(quantity, price):
  return quantity * price
def calculate_laptop_price(quantity, price):
  return quantity * price

def calculate_product_price(product_quantity, product_price):
 return product_quantity * product_price

const fetchData = async (url) => {
    try {
        const response = await fetch(url);
        if (!response.ok) {
            throw new Error('Failed to fetch data');
        }
        return await response.json();
    } catch (error) {
        console.error('Error fetching data:', error.message);
       return null;
    }
};