JSFiddle - React, Tailwind, and code Playground

JavaScript

var someObject = {
    someProperty: 'someValue'
};

for (var item in someObject) {
    console.log(item);  // logs someProperty
}

arguments.constructor.prototype.foo = 'bar';

var someOtherObject = {
    someProperty: 'someValue'
};

for (var item in someOtherObject) {
    console.log(item);  // logs someProperty AND foo, not good
}