const factorialize = (num) => {
  let prevValue = num;         /*declare a variable to hold the previous num
                                which has been assigned from our argument;*/

  if (num === 0) return 1;    /* evaluate an if statement to determine if num
                              is equal to zero and if so return the value one;*/

  while (num > 1) {         /*the con condition is as long as our argument num
                            is greater than one go through the statement*/
    num--;                 /*in the statement we start by decrementing our value
                           of num until it get to one*/

    prevValue *= num;       /*
                              now to our statement
                              at the beginning we had set prevValue to num, beacuse in this
                              example we begin at 5 our prevValue = 5 a the start of the statement.

                              5 * 4 = 20 1st execution 5 is the prevValue and 4
                                         is the new decremented number after num--;
                              20 * 3 = 60 2nd exectuion 20 is now appended to prevValue
                                          and 3 is the new num fater num--;
                              60 * 2 = 120 3rd execution 60 is now appended to prevValue
                                           and 2 is the new num after num--;
                              120 * 1 = 120 4th execution 120 is now appended to prevValue
                                        and 1 is the new num after num--;
                              and the statement is terminated because our condition has been met
                            */
  }
  return prevValue;    /* since our prevValue has an appended value of 120
                        when it terminated because our condition had been met it returns that value.
                      */
}
factorialize(5);