const adventurer = {
    name: 'Alice',
    cat: {
        name: 'Dinah'
    }
};

const dogName = adventurer.dog?.name;
console.log(dogName);
  // expected output: undefined

console.log(adventurer.someNonExistentMethod?.());
  // expected output: undefined
let a = [
    {
    guild: '770748282191740940',
    id: 616002,
    name: 'uwa uwa ao',
    day: 24,
    month: 2,
    __v: 0
  }
];
console.log(a.length)

for (let index = 0; index < 10; index++) {
  var b = index
}

console.log(b)