AI Code Comment Generator (Free Tool)

def calculate_fibonacci(n, memo=None):
    if memo is None:
        memo = {}
    if n in memo:
        return memo[n]
    if n <= 1:
        return n
    memo[n] = calculate_fibonacci(n-1, memo) + calculate_fibonacci(n-2, memo)
    return memo[n]

def calculate_fibonacci(n: int, memo: dict = None) -> int:
    """
    Calculate the nth Fibonacci number using memoization.
    
    Uses dynamic programming with memoization to efficiently compute
    Fibonacci numbers. The memo dictionary caches previously computed
    values to avoid redundant recursive calls.
    
    Args:
        n (int): The position in Fibonacci sequence (0-indexed).
        memo (dict, optional): Cache for memoization. Defaults to None.
    
    Returns:
        int: The nth Fibonacci number.
    
    Raises:
        ValueError: If n is negative.
    
    Examples:
        >>> calculate_fibonacci(5)
        5
        >>> calculate_fibonacci(10)
        55
    
    Time Complexity: O(n)
    Space Complexity: O(n)
    """
    if memo is None:
        memo = {}
    if n in memo:
        return memo[n]
    if n <= 1:
        return n
    memo[n] = calculate_fibonacci(n-1, memo) + calculate_fibonacci(n-2, memo)
    return memo[n]

async function fetchUserData(userId, includeOrders = false) {
  const response = await fetch(`/api/users/${userId}`);
  if (!response.ok) throw new Error('User not found');
  const user = await response.json();
  if (includeOrders) {
    user.orders = await fetchOrders(userId);
  }
  return user;
}

/**
 * Fetches user data from the API with optional order history.
 * 
 * Makes an HTTP GET request to retrieve user information by ID.
 * Optionally fetches and includes the user's order history.
 * 
 * @async
 * @param {string|number} userId - The unique identifier of the user
 * @param {boolean} [includeOrders=false] - Whether to fetch user orders
 * @returns {Promise<Object>} User object with personal data and optional orders
 * @returns {string} returns.id - User ID
 * @returns {string} returns.name - User full name
 * @returns {string} returns.email - User email address
 * @returns {Array<Object>} [returns.orders] - User orders if requested
 * @throws {Error} When user is not found (HTTP 404)
 * @throws {Error} When network request fails
 * 
 * @example
 * // Fetch basic user data
 * const user = await fetchUserData('123');
 * 
 * @example
 * // Fetch user with order history
 * const userWithOrders = await fetchUserData('123', true);
 */
async function fetchUserData(userId, includeOrders = false) {
  const response = await fetch(`/api/users/${userId}`);
  if (!response.ok) throw new Error('User not found');
  const user = await response.json();
  if (includeOrders) {
    user.orders = await fetchOrders(userId);
  }
  return user;
}