Nodejs Utililty Methods Currency Format

function formatCurrency(num) {
    num = num.toString().replace(/\$|\,/g,'');
    if(isNaN(num))
    num = "0";
    sign = (num == (num = Math.abs(num)));
    num = Math.floor(num*100+0.50000000001);
    cents = num%100;
    num = Math.floor(num/100).toString();
    if(cents<10)
...

Number.prototype.ToCurrencyWithSymbol = function (ccyCode, rounder) {
    var symbol = ccyCode.ConvertToCurrencySymbol();
    aDigits = this.toFixed(rounder).split(".");
    aDigits[0] = aDigits[0].split("").reverse().join("")
                                    .replace(/(\d{3})(?=\d)/g, "$1,").split("").reverse().join("");
    return symbol + aDigits.join(".");

Number.prototype.formatCurrency = function()
  return '$' + this.toFixed(2);

Number.prototype.formatCurrency = 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 : "") + i.substr(j).replace(/(\d{3})(?=\d)/g, "$1" + t) + (c ? d + Math.abs(n - i).toFixed(c).slice(2) : "");
...

Number.prototype.formatCurrency = 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 : "") + i.substr(j).replace(/(\d{3})(?=\d)/g, "$1" + t)
  + (c ? d + Math.abs(n - i).toFixed(c).slice(2) : "");
};

Number.prototype.toCurrency = function ( noFractions, currencySymbol, decimalSeparator, thousandsSeparator ) {
    var n, startAt, intLen;
    if ( currencySymbol == null ) currencySymbol = "$";
    if ( decimalSeparator == null ) decimalSeparator = ".";
    if ( thousandsSeparator == null ) thousandsSeparator = ",";
    n = this.round( noFractions ? 0 : 2, true, decimalSeparator );
    intLen = n.length - (noFractions ? 0 : 3);
    if ( (startAt = intLen % 3) == 0 ) startAt = 3;
    for ( var i = 0, len = Math.ceil( intLen / 3 ) - 1; i < len; i++ )n = n.insertAt( i * 4 + startAt, thousandsSeparator );
...

Number.prototype.toCurrency = function() {
  return (arguments[0] ? arguments[0] : "\\") + this.withCommas();
};

Number.prototype.toCurrency = function() {
  return (arguments[0] ? arguments[0] : "") + this.withCommas();
};

Number.prototype.toCurrency = function(){
  return "R$ " + this.format(2, 3, '.', ',');
};

Number.prototype.toCurrency = 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 : "") + i.substr(j).replace(/(\d{3})(?=\d)/g, "$1" + t) + (c ? d + Math.abs(n - i).toFixed(c).slice(2) : "");
...