JSFiddle - React, Tailwind, and code Playground

HTML

<div id="name">Placeholder</div>

JavaScript

function celebrityName(firstName) {
    var nameIntro = "This celebrity is ";

    function lastName(lName) {
        return nameIntro + firstName + " " + lName;        
    }
    return lastName;
}

var mjName = celebrityName("Mike");
console.log(mjName);

mjName("Miller");

$('#name').html(mjName);