ds-algo-study/DS-n-Algos/Arrays/basic-examples/problems/02-recursive-factorial.js

Just experimenting with publishing a package

/***********************************************************************
Write a recursive function called `factorial` that takes an integer, `num`,
and returns the factorial of `num`. Assume the value of `num` is greater 
than or equal to 1.

A factorial is the number get when multiplying a number by itself minus one
all the way down to 1 (but not 0)! We represent them with an exclamation
point, also sometimes called a "bang" in programming.

5! = 5 x 4 x 3 x 2 x 1 = 120

Examples:

factorial(1); // => 1
factorial(3); // => 6
factorial(5); // => 120
***********************************************************************/

function factorial(num) {
  if (num === 1) {
      return 1;
  }

  return num * factorial(num - 1);
}
  
/**************DO NOT MODIFY ANYTHING UNDER THIS LINE*****************/
module.exports = factorial;