My solution for "Bonfire: Factorialize a number"

gistfile1.txt

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

function factorialize(num) {
  var factorArray = [];
  for (var i=1; i <=num; i++ ) {
    factorArray.push(i);
  }
  
  if (num > 0)
  return factorArray.reduce(function(a,b) {
    return a*b;
  });
  
  else {
    return 1;
  }
}

factorialize(20);

Tell me if something if wrong with it! I know it is fairly different from the actual solution, but it seems to me that it gives you the same results.