Question

In Javascript I have a number and I want to add comma to it when it’s displayed as a string.

I can add comma to the number like this:

function numberWithCommas(value) {
  return value.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ",");
}

But I don’t want to call a method on every number that we have to get this. I want to do something similar to this:

Number.prototype.toString = function(radix) {
  return numberWithCommas(this);
}

So when I do the following, the right value will show up:

var num = 100000;
alert(num); // 100,000

Can’t get the above to work. Any ideas?

Answer 1

What about creating a new number function?

Number.prototype.withCommas = function(){
    return this.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ",");
}

var n = 1234567;
alert( n.withCommas() );

http://jsfiddle.net/kyX8x/1/