// this is my code so far:

var currency = doc.stock.exchange.currency; //this is how I get the currency
  var formatNumberNat = val.toLocaleString(
    'en-US', {
      style: 'currency',
      currency: currency
    }
  );
return formatNumberNat; /* €90,102,409,320.00 */

function nFormatter(num, digits) {
  var si = [
    { value: 1E18, symbol: "E" },
    { value: 1E15, symbol: "P" },
    { value: 1E12, symbol: "T" },
    { value: 1E9,  symbol: "G" },
    { value: 1E6,  symbol: "M" },
    { value: 1E3,  symbol: "k" }
  ], i;
  for (i = 0; i < si.length; i++) {
    if (num >= si[i].value) {
      return (num / si[i].value).toFixed(digits).replace(/.0+$|(.[0-9]*[1-9])0+$/, "$1") + si[i].symbol;
    }
  }
  return num.toString();
}
console.log(nFormatter(123, 1));       // 123
console.log(nFormatter(1234, 1));      // 1.2k
console.log(nFormatter(100000000, 1)); // 100M
console.log(nFormatter(299792458, 1)); // 299.8M
console.log(nFormatter(759878, 1));    // 759.9k
console.log(nFormatter(759878, 0));    // 760k

function formatB(n) {
    if (n > 999999999)
        return "$" + (n/1000000000).toFixed(2) + "B";
    else if(n > 999999)
        return "$" + (n/1000000).toFixed(2) + "M";
    else
        return n;
}