Can you hack this? #1

Say that we have a function called nameEqualsToItself how accept a person object as input that checks if the name property of the input object equal the same name property of the input object implemented like this:

const nameEqualsToItself = (person) => person.name === person.name

Can you find the input that makes nameEqualsToItself return false?

const personX = ???
console.log(nameEqualsToItself(personX)) // print `false`

Comments

[Temani Afif]

const personX={};
personX.name=NaN;

OR simply

const personX={name:NaN};

a. If x or y are any of NaN, +∞𝔽, or -∞𝔽, return false. ^ref

[Akash Kava]

It will return false only for NaN, because Number.POSITIVE_INFINITY === Number.POSITIVE_INFINITY returns true, and it is same for negative infinity as well.

[Alfredo Salzillo]

Also if using a Getter or a Proxy returning different values each time :)

[🚩 Atul Prajapati 🇮🇳]

You don't know everything 😛

[Kins]

const personX = { get name() { return Math.random() } };
console.log(nameEqualsToItself(personX)); //This will return false as well 

[Shane McGowan]

This is big brain, love it

[Amin]

Using a Proxy.

"use strict";

const personNameEqualsItself = person => person.name === person.name;

const person = (() => {
  let boolean = true;

  return new Proxy({}, {get: (target, property) => property === "name" ? boolean = !boolean : undefined});
})();

console.log(personNameEqualsItself(person)); // false
console.log(personNameEqualsItself(person)); // false
console.log(personNameEqualsItself(person)); // false

[Richard Kichenama]

const personX = new Proxy({}, { get (target, attr) { return /name/i.test(attr) ? Symbol('name') : target[attr]; });

[Alfredo Salzillo]

It print true :) try it

[Conner Ow]

It printed false.

const nameEqualsToItself = (person) => person.name === person.name
const personX = { name: NaN, };
console.log(nameEqualsToItself(personX))