JSFiddle - React, Tailwind, and code Playground

JavaScript

//this and IIFE

var person = (function() {
    var firstName = "Ryan";
    var lastName = "Anklam";
    
    getFirstName = function() {
    	return firstName + ' ' + lastName;
    };
    
    sayHello = function() {
    	return this.getFirstName() + ' says hello.';
    };
    
    return {
			'getFirstName' : getFirstName,
      'sayHello' : sayHello
    };
})();

console.log(person.getFirstName());
console.log(person.sayHello());