JSFiddle - React, Tailwind, and code Playground

JavaScript

var myLibrary = {
    bar: function () {
        return undefined;
    }
}

var foo = function (undefined) {

    "use strict";

    var x = "foo";
    console.log(x); // "foo"
    var x = undefined;
    console.log(x); // "oops"
    console.log(myLibrary.bar()); // undefined

};



foo('oops');