How to use

realLength

function

in

Array

/**
  * Generate a string out of the choices keys
  * @param  {Array}  choices
  * @param  {Number|String} default - the choice index or name to capitalize
  * @return {String} The rendered choices key string
  */
 generateChoicesString(choices, defaultChoice) {
  var defIndex = choices.realLength - 1;
  if (_$c.isNumber(defaultChoice) && this.opt.choices.getChoice(defaultChoice)) {
   defIndex = defaultChoice;
  } else if (_$c.isString(defaultChoice)) {
   let index = _$c.findIndex(
    choices.realChoices,
    ({ value }) => value === defaultChoice
   );
   defIndex = index === -1 ? defIndex : index;
  }

  var defStr = this.opt.choices.pluck('key');
  this.rawDefault = defStr[defIndex];
  defStr[defIndex] = String(defStr[defIndex]).toUpperCase();
  return defStr.join('');
 }