js adding ',' to currency number code example

Example 1: format amount in javascript

const formatToCurrency = amount => {
  return "$" + amount.toFixed(2).replace(/\d(?=(\d{3})+\.)/g, "$&,");
};
formatToCurrency(12.34546); //"$12.35"
formatToCurrency(42345255.356); //"$42,345,255.36

Example 2: how to format money as currency string

(12345.67).toFixed(2).replace(/\d(?=(\d{3})+\.)/g, '$&,');  // 12,345.67