JSFiddle - React, Tailwind, and code Playground

CSS

body {
   font-family: sans-serif;
   margin: 20px;
   }
div {
   background-color: lightblue;
   padding: 5px;
   }

JavaScript

function printf(format) {
   var values = Array.prototype.slice.call(arguments, 1);
   function insert(str, val) { return str.replace(/%s/, val); }
   return values.reduce(insert, format);
   }

function out(str) { $('body').append($('<div>').text(str)); }
out(printf('%s: %s', 'Lives', 3));
out(printf('Your code is %s.', Math.round(Math.random()*999)));
out(printf('Hi %s, how are you doing?', 'Lee'));