How can I format an integer to a specific length in javascript?

Question

I have a number in Javascript, that I know is less than 10000 and also non-negative. I want to display it as a four-digit number, with leading zeroes. Is there anything more e

Answer 1

How about something like this:

function prefixZeros(number, maxDigits) 
{  
    var length = maxDigits - number.toString().length;
    if(length <= 0)
        return number;

    var leadingZeros = new Array(length + 1);
    return leadingZeros.join('0') + number.toString();
}
//Call it like prefixZeros(100, 5); //Alerts 00100