JSFiddle - React, Tailwind, and code Playground

JavaScript

var foo = function(){
    bar = 'baz';
    return this;
};

// Value of 'bar' ___not defined because the function has never run______

var bee = new foo();

// Value of 'bee.bar': __not defined because bar is now on the window________

// Value of 'bar': _baz___________