Nodejs Utililty Methods Money Format

Number.prototype.toMoney = function(decimals, decimal_sep, thousands_sep)
   var n = this,
   c = isNaN(decimals) ? 2 : Math.abs(decimals), 
   d = decimal_sep || ',', 
   t = (typeof thousands_sep === 'undefined') ? '.' : thousands_sep, 
   sign = (n < 0) ? '-' : '',
   i = parseInt(n = Math.abs(n).toFixed(c)) + '', 
   j = ((j = i.length) > 3) ? j % 3 : 0; 
...

Number.prototype.toMoney = function(decimals, decimal_sep, thousands_sep)
   var n = this,
   c = isNaN(decimals) ? 2 : Math.abs(decimals), 
   d = decimal_sep || '.', 
   t = (typeof thousands_sep === 'undefined') ? ',' : thousands_sep, 
   sign = (n < 0) ? '-' : '',
   i = parseInt(n = Math.abs(n).toFixed(c)) + '',
   j = ((j = i.length) > 3) ? j % 3 : 0;
...

Number.prototype.money = function(c, d, t){
var n = this*1000, 
    c = isNaN(c = Math.abs(c)) ? 0 : 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;
   const money = 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.money = function(decPlaces, thouSeparator, decSeparator, appendix, prefix) {
    var n = this,
        decPlaces = isNaN(decPlaces = Math.abs(decPlaces)) ? 2 : decPlaces,
        decSeparator = decSeparator == undefined ? "." : decSeparator,
        thouSeparator = thouSeparator == undefined ? "," : thouSeparator,
        prefix = prefix || '',
        appendix = appendix || '',
        sign = n < 0 ? "-" : "",
        i = parseInt(n = Math.abs(+n || 0).toFixed(decPlaces)) + "",
...