Trying to find factors of a number in JS

Question

I am just starting JS, and understand the concept of finding a factor. However, this snippet of code is what I have so far. I have the str variable that outputs nothing but the

Answer 1

function factorialize(num) {
 var result = '';
  if( num === 0){
    return 1;
  }else{
    var myNum = [];

  for(i = 1; i <= num; i++){
    myNum.push(i);
    result = myNum.reduce(function(pre,cur){
      return pre * cur;
    });
  }
     return result;
    }
}

factorialize(9);