JSFiddle - React, Tailwind, and code Playground

JavaScript

var DefaultArguments = function() {
    this.hello = 'Hello'
    this.world = 'world'
};

var myFunction = function(object) {
    return object.hello + ' ' + object.world + '!';
};


var newArguments1 = new DefaultArguments();
newArguments1.hello = 'Goodbye';
alert(myFunction(newArguments1));

var newArguments2 = new DefaultArguments();
newArguments2.world = 'Mars';
alert(myFunction(newArguments2));