Factorial (7 kyu)

// Factorial (7 kyu)
// https://www.codewars.com/kata/54ff0d1f355cfd20e60001fc/

// Description:

// In mathematics, the factorial of a non-negative integer n, denoted by n!, is the product of all positive integers less than or equal to n. For example: 5! = 5 * 4 * 3 * 2 * 1 = 120. By convention the value of 0! is 1.

// Write a function to calculate factorial for a given input. If input is below 0 or above 12 throw an exception of type ArgumentOutOfRangeException (C#) or IllegalArgumentException (Java) or RangeException (PHP) or throw a RangeError (JavaScript) or ValueError (Python) or return -1 (C).

// More details about factorial can be found here.


// My Solution:

function factorial(n) {
    if (n < 0 || n > 12) {
        throw new RangeError("Invalid input")
    }
    let mult = 1
    for (let i = 1; i <= n; i++) {
        mult *= i
    }
    return mult
}