Optional Chaining in javascript - avoid crashing your app

optional_chaining.js

// This is an example of Optional Chaining
const adventurer = {
  name: 'Alice',
  cat: {
    name: 'Dinah'
  }
};

const dogName = adventurer.dog?.name;
console.log(dogName);
// expected output: undefined <- this is better than crashing your app

const dogName = adventurer.dog.name;
// expected output: Uncaught TypeError: Cannot read property 'name' of undefined