http://www.freecodecamp.com/robertsheacole 's solution for Bonfire: Factorialize a Number

bonfire-factorialize-a-number.js

// Bonfire: Factorialize a Number
// Author: @robertsheacole
// Challenge: http://www.freecodecamp.com/challenges/bonfire-factorialize-a-number
// Learn to Code at Free Code Camp (www.freecodecamp.com)

function factorialize(num) {
  //Check is num paramater is equal to 0. If so return 1, otherwise answer will be 0. 
  if(num === 0){
    return 1;
  }
 
 //This is the main part of the function. It multiplies the paramater by the function paramater minus 1. So, (5 * (5 - 1))
 return num * factorialize(num - 1);
}

factorialize(5);