NOTE: Potentially outdated. ECMAScript 2017 includes
String.prototype.padStart
.
You’ll have to convert the number to a string since numbers don’t make sense with leading zeros. Something like this:
function pad(num, size) { num = num.toString(); while (num.length < size) num = "0" + num; return num; }
Or, if you know you’d never be using more than X number of zeros, this might be better. This assumes you’d never want more than 10 digits.
function pad(num, size) { var s = "000000000" + num; return s.substr(s.length-size); }
If you care about negative numbers you’ll have to strip the -
and read it.
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