optional-chaining-operator.js

// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Optional_chaining

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

const dogName = adventurer.dog?.name;
// short way to make property dog optional
const dogName = (adventurer && adventurer.dog && adventurer.dog.name);
// previous solution

console.log(dogName);
// expected output: undefined

console.log(adventurer.someNonExistentMethod?.());
// expected output: undefined