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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230
러닝 자바스크립트
get
userGear
() {
return
carProps
.
get
(
this
).
userGear
; }
set
userGear
(
value
) {
if
(
this
._
userGears
.
indexOf
(
value
) <
0
)
throw
new
Error
(`
Invalid
gear
: ${
value
}`);
carProps
.
get
(
this
).
userGear
=
value
;
}
shift
(
gear
) {
this
.
userGear
=
gear
; }
}
return
Car
;
})();
여기서는 즉시 호출하는 함수 표현식을 써서
WeakMap
을 클로저로 감싸고 바깥에서 접근할 수 없
게 했습니다.
WeakMap
은 클래스 외부에서 접근하면 안 되는 프로퍼티를 안전하게 저장합니다.
프로퍼티 이름에 심볼을 쓰는 방법도 있습니다. 이렇게 해도 어느 정도는 보호할 수 있지만, 클
래스에 들어 있는 심볼 프로퍼티 역시 접근이 불가능한 것은 아니므로 이 방법에도 한계가 있
다고 해야 합니다.
9.2.2
클래스는 함수다
ES6
에서
class
키워드를 도입하기 전까지, 클래스를 만든다는 것은 곧 클래스 생성자로 사용
할 함수를 만든다는 의미였습니다.
class
문법이 훨씬 더 직관적이고 단순하긴 하지만, 사실
class
는 단축 문법일 뿐이며 자바스크립트의 클래스 자체가 바뀐 것은 아닙니다. ...
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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.