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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125
4
장
제어문
더 명확해지기는커녕 복잡해지기만 했습니다.
if
(
new
Date
().
getDay
() = = =
3
) {
totalBet
=
1
;
}
else
{
if
(
funds
===
7
) {
totalBet
=
funds
;
}
else
{
console
.
log
("
No
superstition
here
!");
}
}
4.2.3
메타 문법
메타 문법
metasyntax
은 다른 문법을 설명하는 문법입니다. 컴퓨터 과학을 공부한 사람은 이 설명
을 보고 즉시 ‘배커스-나우르 표기법 확장(
EBNF
,
Extended
Backus
-
Naur
Form
)’을 떠올
렸을 겁니다. 단순한 개념에는 어울리지 않게 거창한 이름이죠.
이 장에서는 메타 문법을 써서 자바스크립트 제어문의 문법을 간결하게 표기합니다. 필자가 사
용할 메타 문법은 단순하고 비공식적입니다. 사실 중요한 건 이 문법이 모질라 개발자 네트워
크(
MDN
)의 자바스크립트 문서
3
에서 사용하는 문법이라는 겁니다. 자바스크립트를 공부하다
보면
MDN
을 찾아볼 일이 아주 많을 테니, 여기 익숙해지면 도움이 될 겁니다.
이 메타 문법에서 기억할 것은 두 가지뿐입니다. 대괄호 ([])로 감싼 것은
옵션
이고, 생략 부호
(
...
)는 ‘여기 들어갈 내용이 더 있다’는 뜻입니다. 단어는 플레이스홀더로 사용하며 그 의미는
문맥에서 알 수 있습니다. ...
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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.