zero-fill.js 352 Bytes
export default function zeroFill(number, targetLength, forceSign) {
    var absNumber = '' + Math.abs(number),
        zerosToFill = targetLength - absNumber.length,
        sign = number >= 0;
    return (
        (sign ? (forceSign ? '+' : '') : '-') +
        Math.pow(10, Math.max(0, zerosToFill)).toString().substr(1) +
        absNumber
    );
}