JSFiddle - React, Tailwind, and code Playground

JavaScript

var bob = (function() {
    //...private
    var age = 30;

    function setAge(newAge) {
        age = newAge;
    };

    function getAge() {
            return age;
        }
    // Public api
    return {
        setAge: setAge,
        getAge: getAge
    }
}());
bob.setAge(50);
alert(bob.getAge());