JavaScript Optional Chaining & Nullish Coalescing

https://www.youtube.com/watch?v=WHUvtiKy_pg

관련 문서

• Optional chaining

Optional chaining (?.) - JavaScript | MDN

옵셔널 체이닝 '?.'

• Nullish coalescing

Nullish coalescing operator (??) - JavaScript | MDN

https://im-developer.tistory.com/192

• 그 외 ES6 문법 소개

https://blog.nextinnovation.kr/tech/JavascriptProTips/