Nodejs Utililty Methods Money Format

Number.prototype.formatMoney = function(c, d, t){
var n = this, 
    c = isNaN(c = Math.abs(c)) ? 2 : c, 
    d = (d === undefined) ? "." : d, 
    t = (t === undefined) ? "," : t, 
    s = n < 0 ? "-" : "", 
    i = parseInt(n = Math.abs(+n || 0).toFixed(c)) + "", 
    j = (j = i.length) > 3 ? j % 3 : 0;
   return s + (j ? i.substr(0, j) + t : "") +
...

Number.prototype.formatMoney = function(c, d, t){
var n = this, 
    c = isNaN(c = Math.abs(c)) ? 2 : c, 
    d = d == undefined ? "." : d, 
    t = t == undefined ? "," : t, 
    s = n < 0 ? "-" : "", 
    i = String(parseInt(n = Math.abs(Number(n) || 0).toFixed(c))), 
    j = (j = i.length) > 3 ? j % 3 : 0;
   return s + (j ? i.substr(0, j) + t : "") + i.substr(j).replace(/(\d{3})(?=\d)/g, "$1" + t) + (c ? d + Math.abs(n - i).toFixed(c).slice(2) : "");
...

'use strict';
Number.prototype.formatMoney = function(c, d, t, u) {
    var n = this,
        s = n < 0 ? '-' : '',
        i = parseInt(n = Math.abs(+n || 0).toFixed(c)) + '',
        j = (j = i.length) > 3 ? j % 3 : 0;
    c = isNaN(c = Math.abs(c)) ? 2 : c;
    d = d === undefined ? '.' : d;
    t = t === undefined ? ',' : t;
...

Number.prototype.formatMoney = function(decPlaces, thouSeparator, decSeparator) {
    var n = this,
    decPlaces = isNaN(decPlaces = Math.abs(decPlaces)) ? 2 : decPlaces,
    decSeparator = decSeparator == undefined ? "." : decSeparator,
    thouSeparator = thouSeparator == undefined ? "," : thouSeparator,
    sign = n < 0 ? "-" : "",
    i = parseInt(n = Math.abs(+n || 0).toFixed(decPlaces)) + "",
    j = (j = i.length) > 3 ? j % 3 : 0;
    return sign + (j ? i.substr(0, j) + thouSeparator : "") + i.substr(j).replace(/(\d{3})(?=\d)/g, "$1" + thouSeparator) + (decPlaces ? decSeparator + Math.abs(n - i).toFixed(decPlaces).slice(2) : "");
...

Number.prototype.formatMoney = function(decPlaces, thouSeparator, decSeparator) {
    var n = this,
      decPlaces = isNaN(decPlaces = Math.abs(decPlaces)) ? 2 : decPlaces,
      decSeparator = decSeparator == undefined ? "." : decSeparator,
      thouSeparator = thouSeparator == undefined ? "," : thouSeparator,
      sign = n < 0 ? "-" : "",
      i = parseInt(n = Math.abs(+n || 0).toFixed(decPlaces)) + "",
      j = (j = i.length) > 3 ? j % 3 : 0;
    return sign + (j ? i.substr(0, j) + thouSeparator : "") + i.substr(j).replace(/(\d{3})(?=\d)/g, "$1" + thouSeparator) + (decPlaces ? decSeparator + Math.abs(n - i).toFixed(decPlaces).slice(2) : "");
...

function number2Money(num) {
  if(isNaN(num))
     return "Invalid number.";
  return '$' + num.formatMoney(2, ',', '.');
Number.prototype.formatMoney = function(decPlaces, thouSeparator, decSeparator) {
    var n = this,
        decPlaces = isNaN(decPlaces = Math.abs(decPlaces)) ? 2 : decPlaces,
        decSeparator = decSeparator == undefined ? "." : decSeparator,
...

Number.prototype.formatMoney = function(decPlaces, thouSeparator, decSeparator) {
  var n = this,
  decPlaces = isNaN(decPlaces = Math.abs(decPlaces)) ? 2 : decPlaces,
  decSeparator = decSeparator == undefined ? "," : decSeparator,
  thouSeparator = thouSeparator == undefined ? "." : thouSeparator,
  sign = n < 0 ? "-" : "",
  i = parseInt(n = Math.abs(+n || 0).toFixed(decPlaces)) + "",
  j = (j = i.length) > 3 ? j % 3 : 0;
  return sign + (j ? i.substr(0, j) + thouSeparator : "") + i.substr(j).replace(/(\d{3})(?=\d)/g, "$1" + thouSeparator) + (decPlaces ? decSeparator + Math.abs(n - i).toFixed(decPlaces).slice(2) : "");
...

function addCommas(nStr)
  nStr += '';
  x = nStr.split('.');
  x1 = x[0];
  x2 = x.length > 1 ? '.' + x[1] : '';
  var rgx = /(\d+)(\d{3})/;
  while (rgx.test(x1)) {
    x1 = x1.replace(rgx, '$1' + ',' + '$2');
...

Number.prototype.formatMoney = function(decPlaces, thouSeparator, decSeparator,
    currencySymbol) {
  var n = this, decPlaces = isNaN(decPlaces = Math.abs(decPlaces)) ? 2
      : decPlaces, decSeparator = decSeparator == undefined ? "."
      : decSeparator, thouSeparator = thouSeparator == undefined ? ","
      : thouSeparator, currencySymbol = currencySymbol == undefined ? "$"
      : currencySymbol, sign = n < 0 ? "-" : "", i = parseInt(n = Math
      .abs(+n || 0).toFixed(decPlaces))
      + "", j = (j = i.length) > 3 ? j % 3 : 0;
...

Number.prototype.formatMoney = function(decPlaces, thouSeparator, decSeparator, currencySymbol) {
    decPlaces = isNaN(decPlaces = Math.abs(decPlaces)) ? 2 : decPlaces;
    decSeparator = decSeparator == undefined ? "." : decSeparator;
    thouSeparator = thouSeparator == undefined ? "," : thouSeparator;
    currencySymbol = currencySymbol == undefined ? "$" : currencySymbol;
    var n = this,
        sign = n < 0 ? "-" : "",
        i = parseInt(n = Math.abs(+n || 0).toFixed(decPlaces)) + "",
        j = (j = i.length) > 3 ? j % 3 : 0;
...