const obj = { a: 1, b: 2 };
const obj2 = { ...obj, b: 3 };

const samePrototype = Object.getPrototypeOf(obj) === Object.getPrototypeOf(obj2);

console.log(samePrototype);

function Foo() {
  this.bar = 1;
}

Foo.prototype.bar = 2;

const foo = new Foo();
console.log(foo.bar);

const func = () => arguments.length;
console.log(func(1, 2, 3));

const array = Array.from({ length: 5 }, () => Math.random() > 0.5);

console.log(array);

const obj1 = { a: 1 };
const obj2 = Object.create(obj1);
obj2.b = 2;

const result = 'a' in obj2;

console.log(result);

const array = [1, 2, 3];
array[-1] = 0;

console.log(array.length);