questionmark dot javascript version code example

Example 1: optional chain operator

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

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

Example 2: optional chaining

const array = [1,2,3,4,5];
let arrItem = array?.[4]; 

console.log(arrItem); /// 5