JSFiddle - React, Tailwind, and code Playground

by Marius Jopen

JavaScript

String.prototype.padLeft = function padLeft(length, leadingChar) {
    if (leadingChar === undefined) leadingChar = "0";
    return this.length < length ? (leadingChar + this).padLeft(length, leadingChar) : this;
};

var s = "11";
alert(s.padLeft(2));