Medium optional chaining example

medium.optional.chaining.example.js

// When you have a deeply nested object like that
// *and you're not sure* whether or not a property exists 
const user = {
  address: {
    city: {
      name: 'Tokyo'
    }
  }
};

// pre-optional-chaining
const name = user.address && user.address.city && user.address.city.name;

// with optional chaining
const name = user?.address?.city?.name;