JSFiddle - React, Tailwind, and code Playground

JavaScript

function padString (str, len, padWith) {
    var padLength = len - str.length;
    return padLength < 1 ? str : Array(padLength + 1).join(padWith) + str;
}

console.log( padString('1234567899', 9, '&nbsp;') );
console.log( padString('123456789', 9, '&nbsp;') );
console.log( padString('12345678', 9, '&nbsp;') );
console.log( padString('1234567', 9, '&nbsp;') );
console.log( padString('234567', 9, '&nbsp;') );