Q:

Formatting Number in javascript without using minimumFractionDigits, maximumFractionDigits

I have following types of values in a, b, c, d.
a= 12345678
b= 12345678.098
c=12345678.1
d=12345678.11

I need to format like,
a = 12,345,678.000
b=  12,345,678.098
c=12,345,678.100
d=12,345,678.110

I already tried tolocaleString() and toFixed(3) method. But I'm not able to works together of both method.
need your suggestion on this.

A:

This might help you.

var a = 12345678;
var b = 12345678.098;
var c = 12345678.1;
var d = 12345678.11;

String.prototype.format = function() {
  return this.replace(/(\d)(?=(\d{3})+(?!\d))/g, "$1,");
};

function formatNumber(input) {
  return parseFloat(input).toFixed(3).toString().format();
}

console.log(formatNumber(a));
console.log(formatNumber(b));
console.log(formatNumber(c));
console.log(formatNumber(d));

