Decimal to DMS converter

dd2dms.js

const dd2dms = (latOrLong) => {
  latOrLong = (typeof latOrLong === 'number') ? ''+latOrLong : latOrLong; //convert to string

  const nan2S = (input) => (isNaN(input) || 'NaN' === input) ? '0' : `${input}`;

  const result = {
    sign: '',
    deg: '0',
    min: '0',
    sec: '0'
  };

  // check for `-`
  let value;
  if (latOrLong.substr(0, 1) === "-") {
    value = latOrLong.substr(1, latOrLong.length - 1);
    result.sign = '-';
  } else {
    value = latOrLong;
  }

  // degrees = degrees
  let values = value.split(".");
  result.deg = nan2S(values[0]);

  // * 60 = mins
  let remainder = ("0." + values[1]) * 60;
  let minuteValues = remainder.toString().split(".");
  result.min = nan2S(minuteValues[0]);

  // * 60 again = secs
  let minuteRemainder = ("0." + minuteValues[1]) * 60;
  result.sec = nan2S(Math.round(minuteRemainder));

  return result;
};

const dd2dmsToString = (latOrLon) = `${latOrLon.sign}${latOrLon.deg}° ${latOrLon.min}' ${latOrLon.sec}"`;