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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427
21
장
객체 프로퍼티 설정과 프락시
객체 프로퍼티 설정과 프락시
CHAPTER
21
21.1
접근자 프로퍼티
getter
와
setter
객체 프로퍼티에는
데이터 프로퍼티
와
접근자
accessor
프로퍼티
두 가지가 있습니다. 우리는 두
가지 프로퍼티를 이미 살펴봤지만, 접근자 프로퍼티는
ES6
의 단축 문법 때문에 잘 드러나지는
않았습니다.
함수 프로퍼티(메서드)에 대해서는 이미 잘 알고 있습니다. 접근자 프로퍼티는 메서드와 비슷
한데,
getter
와
setter
두 가지
함수로 구성된다는 것과 접근했을 때 함수라기보다는 데이터 프
로퍼티와 비슷하게 동작한다는 점이 조금 다릅니다. 이런 면에서 접근자 프로퍼티를 동적 프로
퍼티라고 부르기도 합니다.
동적 프로퍼티에 대해 생각해 보겠습니다.
User
클래스가 있고 이 클래스에
setEmail
과
getEmail
메서드가 있습니다.
email
프로퍼티를 두면 사용자가 잘못된 이메일 주소를 설정하
는 일을 막기 힘드니까
getter
와
setter
메서드를 만들기로 했습니다. 클래스는 단순하게 만들
겠습니다. @ 기호가 들어있는 문자열은 모두 유효한 이메일 주소라고 간주합니다.
const
USER
_
EMAIL
=
Symbol
();
class
User
{
setEmail
(
value
) {
if
(!/@/.
test
(
value
))
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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.