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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249
10
장
맵과 셋
Map
과 마찬가지로
Set
에도
size
프로퍼티가 있습니다.
roles
.
size
; //
2
셋의 장점은 아주 단순합니다. 추가하려는 것이 셋에 이미 있는지 확인할 필요가 없습니다. 이
미 있다면 아무 일도 일어나지 않습니다.
roles
.
add
("
User
"); //
Set
[ "
User
", "
Admin
" ]
roles
.
size
; //
2
역할을 제거할 때는
delete
()
를 호출합니다. 제거에 성공했다면, 즉 그런 역할이 셋에 존재했
다면
true
를 반환하고, 그렇지 않다면
false
를 반환합니다.
roles
.
delete
("
Admin
"); //
true
roles
; //
Set
[ "
User
" ]
roles
.
delete
("
Admin
"); //
false
10.4
위크셋
위크셋은 객체만 포함할 수 있으며, 이 객체들은 가비지 콜렉션의 대상이 됩니다.
WeakMap
과 마
찬가지로
WeakSet
도 이터러블이 아니므로 위크셋의 용도는 매우 적습니다. 위크셋의 실제 용도
는 주어진 객체가 셋 안에 존재하는지 아닌지를 알아보는 것뿐이라고 해도 과언이 아닙니다.
예를 들어 산타 클로스가
naughty
라는
WeakSet
을 가지고 어떤 아이가 우는 아이인지 확인해서
선물 대신 석탄을 놓고 온다고 합시다.
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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.