ConfirmIt Select one answer randomly in a single question

Randomly select one answer based on the selected answers in a multiple question that is not required.

//surveyscripting.com

//conjoin is a single question
//q1 is a multiple question
function assignArray(ans, num)
{
  for (var ab = 0; ab <= 2; ++ab )
  {
    if (!ans[ab] || !IsNumeric(ans[ab])) {
      ans[ab] = num;
      break;
    }
  }
}
function conjoint()
{
  f('conjoint').set(null);  //for testing purposes only
  var counter : int = 0;
  var ans = new Array();
  var form = f('conjoint');
  var answerCode;

  if (f('Q1')[3].toBoolean())
  {
    answerCode = 1;
    assignArray(ans, answerCode);
    counter++;
  }
  if (f('Q1')[2].toBoolean())
  {
    answerCode = 2;
    assignArray(ans, answerCode);
    counter++;
  }
  if (f('Q1')[5].toBoolean()) {
    answerCode = 3; 
    assignArray(ans, answerCode);
    counter++;
  }
  if (counter == 1) //if we have only 1 choice selected
  {
    f('conjoint').set(answerCode);
  }
  else if (counter > 1) //if we have more than 1 choice selected
  {
    var randomNumber1 : float = Math.random()*ans.length;
    var randomIndex1 : int = Math.floor(randomNumber1);
    var code1 = ans[randomIndex1];
    form.set(code1);
  }
  else if (!f('conjoint').toBoolean()) //if we have no choices selected
  {
    var precodes = form.domainValues();
    var randomNumber : float = Math.random()*precodes.length;
    var randomIndex : int = Math.floor(randomNumber);
    var code = precodes[randomIndex];
    form.set(code);
  }
}