JSFiddle - React, Tailwind, and code Playground

HTML

<p>i am not good at coding</p>

JavaScript

function change(charm) {
    var string = eval(charm), change = "", newstring = string.split("."), tochange;
    for (var i = 0; i < newstring.length; i++) {
        tochange = newstring[i].trim().charAt(0);
        newstring[i] = newstring[i].replace(tochange, tochange.toUpperCase());
    }
    change = newstring.join(" . ");
    return change;
}
var text = change("document.getElementsByTagName('p')[0].innerHTML");
document.getElementsByTagName("p")[0].innerHTML = text;