Comments on: Formatting Numbers With Commas in AS3

By: Andrew

Andrew — Thu, 24 Jun 2010 23:47:22 +0000

As with jack – this came in very handy and works as expected; thanks for sharing it.

By: nixon

nixon — Tue, 30 Mar 2010 20:10:08 +0000

While your solution will work for any sized positive number it won’t handle numbers with a decimal point.

For example 5.25 would be formatted 5,.25

Our two functions aren’t behaving that much differently, personally, I find the flexibility to work with negative numbers and decimal points is worth the extra few lines of code because I can reuse the same function anytime I need formatted numbers and don’t have to revisit it when a special case comes along.

By: Scott

Scott — Mon, 29 Mar 2010 17:28:53 +0000

I took a different approach — should work for any sized number. I didn’t need the negative detection, you should be able to add that to this easily if you need it.

public function addCommas(number:Number):String
{
var numberString:String = String(number);
var newString:String = “”;
var col:int = 0;
for (var index:int = numberString.length-1; index >= 0; index–)
{
col++;
newString = numberString.substr(index, 1) + newString;
if (col == 3 && index != 0)
{
newString = “,” + newString;
col = 0;
}

}
return newString;
}

By: Jack

Jack — Wed, 27 Jan 2010 01:39:13 +0000

Thanks for posting the code. Works great and saved me a ton of time.

-Jack

By: Nixon

Nixon — Wed, 18 Nov 2009 14:42:42 +0000

hey there Wyeth,
I’ve cranked some pretty big numbers through the function without a problem…

I think the issue is that line you break out:
var mod:Number = num.length/3;

In actuality should read:
var mod:Number = num.length%3;

The percent sign being the modulus math operation. The modulus operator is doing the same thing as your switch statement in that, 4%3 = 1, 5%3=2 etc etc. Unfortunately the switch statement you’ve outlined won’t work on numbers with more than 9 digits.

I would replace the switch with this:
var mod:Number = num.length%3;

I think the problem is from wordpress really butchering the code format… maybe I can attach a file for download…

By: Wyeth

Wyeth — Tue, 17 Nov 2009 23:53:23 +0000

Hi there,
Thanks for your script. It helped me. I had a problem though. When the number got up into higher digits, the commas were being placed in the wrong places. I tried a few things and then ended up replacing

var mod:Number = num.length/3;

with a switch statement:

switch(num.length){
case 4:
mod = 1;
break;

case 5:
mod = 2;
break;

case 6:
mod = 3;
break;

case 7:
mod = 1;
break;

case 8:
mod = 2;
break;

case 9:
mod = 3;
break;
}

It worked perfectly after that.

Thanks again,

Best,

-w