title: factorial tags: math,recursion,beginner
Calculates the factorial of a number.
Use recursion.
If n
is less than or equal to 1
, return 1
.
Otherwise, return the product of n
and the factorial of n - 1
.
Throws an exception if n
is a negative number.
const factorial = (n: number): number => (n <= 1 ? 1 : n * factorial(n - 1));
factorial(6); // 720