July 2017
Beginner to intermediate
464 pages
10h 38m
Korean
Content preview from 러닝 자바스크립트: ES6로 제대로 입문하는 모던 자바스크립트 웹 개발
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248
러닝 자바스크립트
b
.
setSecret
('
secret
B
');
a
.
getSecret
(); // "
secret
A
"
b
.
getSecret
(); // "
secret
B
"
일반적인
Map
을 써도 되지만, 그렇게 하면
SecretHolder
인스턴스에 저장한 내용은 가비지 콜
렉션에 포함되지 않습니다.
10.3
셋
셋
은 중복을 허용하지 않는 데이터 집합입니다. 이전 예제를 재활용합시다. 그런데 이번에는
한 사용자에게 여러 역할을 할당하고 싶다고 합시다. 예를 들어
"
User
"
역할은 모든 사용자에
게 할당되지만, 관리자는
"
User
"
역할과
"
Admin
"
역할을 동시에 가질 수 있습니다. 하지만 같
은 사용자에게 같은 역할을 여러 번 부여한다는 건 상식적이지 않습니다. 셋은 이런 경우에 이
상적인 데이터 구조입니다.
먼저
Set
인스턴스를 만듭니다.
const
roles
=
new
Set
();
이제 사용자 역할을 추가할 때는
add
()
메서드를 사용합니다.
roles
.
add
("
User
"); //
Set
[ "
User
" ]
이 사용자에게 관리자 역할을 추가하려면
add
()
를 다시 호출합니다.
roles
.
add
("
Admin
"); //
Set
[ "
User
", "
Admin
" ]
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.