JSFiddle - React, Tailwind, and code Playground

JavaScript

window.foo = {
    bar: {
        baz: function() {
            alert('Eureka!');
        }
    }
};

var callMe = 'foo.bar.baz';

callMe.split('.').reduce(function(prev, value) {
    return prev[value] || function() {};
}, window)();