February 2022
Beginner to intermediate
784 pages
24h 53m
Korean
Content preview from 자바스크립트 완벽 가이드
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the Denitive Guide
131
5.5 점프 문
티와 메서드는 기본적으로 열거 가능합니다. 14.1절에서 이들을 열거 불가로 전환
하는 방법을 설명합니다.
열거 가능한 상속된(6.3.2절) 프로퍼티 역시
for
/
in
루프의 순회 대상에 속합니
다. 따라서 모든 객체에서 상속하는 프로퍼티를 정의하고
for
/
in
루프를 사용한다
면 결과가 예상과 다를 수 있습니다. 이 때문에 많은 프로그래머가
for
/
in
루프 대
신
Object.keys()
와
for
/
of
루프를 조합하길 선호합니다.
for
/
in
루프의 바디에서 아직 열거되지 않은 프로퍼티를 삭제한다면 그 프로퍼
티는 순회 대상에서 빠집니다. 루프 바디에서 객체에 새 프로퍼티를 정의한다면 그
프로퍼티는 순회 대상에 있을 수도 있고 없을 수도 있습니다.
for
/
in
이 객체 프로
퍼티를 열거하는 순서는 6.6.1절에서 설명합니다.
5.5
자바스크립트 문에는
점프 문
점프 문이라는 카테고리도 있습니다. 이름에서 짐작할 수 있
듯 이들은 자바스크립트 인터프리터가 소스 코드의 다른 위치로 이동하게 합니
다.
break
문은 인터프리터를 루프를 비롯한 다른 문의 끝으로 이동시킵니다.
con
tinue
문은 루프 바디의 나머지를 생략하고 루프 맨 위로 돌아가 새 반복을 시작하
게 합니다. 자바스크립트는 문에 라벨, 즉 ...
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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.