js number padding to number of characters

export function padStart(number, digits = 2, emptyDigit = 0) {
	let length = 0;
	let n = Math.abs(number);
	let absoluteNumber = n;
	do {
		n /= 10;
		length++;
	} while (n >= 1);
	const prefix = Array(Math.max((digits - length) + 1, 0)).join(emptyDigit);
	return number < 0 ? `-${prefix}${absoluteNumber}` : prefix + number;
}

export default padStart;

4
5

                                    var n = 123

String(&quot;00000&quot; + n).slice(-5); // returns 00123
(&quot;00000&quot; + n).slice(-5); // returns 00123
(&quot;     &quot; + n).slice(-5); // returns &quot;  123&quot; (with two spaces)

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