Factorial of number
Calculates the factorial of a number.
- Use recursion.
- If
nis less than or equal to1, return1. - Otherwise, return the product of
nand the factorial ofn - 1. - Throw a
TypeErrorifnis a negative number.
const factorial = n => n < 0 ? (() => { throw new TypeError('Negative numbers are not allowed!'); })() : n <= 1 ? 1 : n * factorial(n - 1); factorial(6); // 720
