Using .toLocaleString() in Node.js

Question

So I was writing a small helper method to convert numbers into a valid money format ($xx,xxx.xx) using .toLocaleString(). Everything works as expe

Answer 1

Just in case someone else stumbles upon this, here's how I formatted a number into a valid US dollar string while in a Node.js environment.

Number.prototype.toMoney = function() {
  var integer = this.toString().split('.')[0];
  var decimal = this.getDecimal();

  integer = integer.replace(/\B(?=(\d{3})+(?!\d))/g, ",");

  if( !decimal || !decimal.length ) {
    decimal = "00";
  } else if ( decimal.length === 1) {
    decimal += '0';
  } else if ( decimal.length > 2 ) {
    decimal = decimal.substr(0, 2);
  }

  return '$' + integer + '.' + decimal;
};

Number.prototype.getDecimal = function() {
  var n = Math.abs(this);
  var dec = n - Math.floor(n);
  dec = ( Math.round( dec * 100 ) / 100 ).toString();

  if( dec.split('.').length ) {
    return dec.split('.')[1];
  } else return "";
};

There are a few boo-boo's here, namely extending the native Number prototype. You will want to avoid this is 90% of the time; this is more specific to my particular implementation.

I blatantly stole the regex for formatting the commas from this question. and hacked together the decimal support of my own volition. Mileage may vary.