https://blog.webdevsimplified.com/2020-03/javascript-optional-chaining/
JavaScript Optional Chaining
Optional chaining is a new JavaScript language feature which will revolutionize how null and undefined are handled.
javascript optional chaining
https://www.tutorialspoint.com/javascript/javascript_optional_chaining.htm
JavaScript - Optional Chaining
The optional chaining in JavaScript allows you to access nested properties and methods of an object without checking if each property exists. This can help to...
javascript optional chaining