Recursive Factorial Calculation

Calculates the factorial of a non-negative integer using recursion.

Technology Stack : Recursion

Code Type : Recursive function

Code Difficulty : Intermediate

                
                    
def factorial(n, accumulator=1):
    if n < 0:
        raise ValueError("Input must be a non-negative integer")
    if n == 0:
        return accumulator
    else:
        return factorial(n - 1, n * accumulator)