JSFiddle - React, Tailwind, and code Playground

by Fernando Araujo

HTML

Title string example:
<span id="title">TESTE</span>

JavaScript

String.prototype.title = function () {
    return this.replace(/\w\S*/g, function(txt){return txt.charAt(0).toUpperCase() + txt.substr(1).toLowerCase();});
};

var test = "JOHN DOE da silva".title()
document.getElementById('title').innerHTML = test;