Comments on: Algorithm for adding leading zeros

By: Ed

Ed — Fri, 22 Jan 2010 06:40:18 +0000

Adding a little bit to @Fernandos post. You need to add 1 to the number of zeros to join to make it come out to the correct number. I also made it so that the number of zeros to add defaults to 1.

public static function addLeadingZero(n:int, numZeros:int = 1):String
{
return (new Array(numZeros + 1).join(’0′)) + n as String;
}

By: Mozart Petter

Mozart Petter — Tue, 14 Jul 2009 13:58:46 +0000

I think that a good solution is this:

function addLeadingZeros(n:Number, q:Number):String
{
return Math.pow(10, q – n.toString().length).toString().substr(1) + n;
}

Without the unnecessary loop.

Cheers

By: 5566

5566 — Fri, 03 Jul 2009 02:01:48 +0000

@Fernando, I will blame the programmer whoever tries to pass “-1″ in to add zeros in front of it. It’s pointless to use uint either. It’ll end up as a very big integer.

Anyway, very cool algorithm. Smarter than mine, definitely!

By: Fernando

Fernando — Thu, 02 Jul 2009 18:35:06 +0000

You arguments should be unsigned int or otherwise you will end up with smth like: “000-10″.

My try would be:

function addZero(n:uint, numZeros:uint):String{
return (new Array(numZeros).join(”0″)) + n;
}

Cheers!

By: fabbrikk

fabbrikk — Thu, 02 Jul 2009 10:48:50 +0000

Hi, I think you have forgot the return statement.

function addZero(n:int, numZeros:int = 1):String {
var str:String = n + “”;
while (str.length {
str = “0″ + str;
}
return str;
}