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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80
러닝 자바스크립트
에서
ROOM
_
TEMP
_
C
가 있는 곳 어디든 숫자형 리터럴
21
.
5
를 써도 됩니다. 숫자형 리터럴을 한두 군데 쓰는
정도라면 이렇게 해도 괜찮습니다. 하지만 그런 곳이
1
0
개, 또는
1
00
개쯤 된다면 상수나 변수를 써야 합니다.
상수나 변수를 쓰면 코드를 이해하기 쉽고 값을 바꿀 때도 한 곳에서만 바꾸면 됩니다.
어디에 변수를 쓰고 어디에 상수를 쓸지 결정하는 것은 프로그래머의 몫입니다. 어떤 경우는
상수를 쓰는 것이 거의 확실합니다. 예를 들어
π
의 근삿값이나
DAYS
_
IN
_
MARCH
같은 경우는
상수가 적절합니다.
ROOM
_
TEMP
_
C
처럼 좀 모호한 경우도 있습니다. 필자는
21
.
5
°
C
라는 온도
를 아주 쾌적한 온도라고 생각하지만, 그렇게 생각하지 않는 사람도 있을 겁니다. 따라서 이 값
을 애플리케이션 안에서 바꿀 수 있어야 한다면 변수를 쓰는 게 맞습니다.
3.5
원시 타입과 객체
자바스크립트의 값은
원시 값
primitive
또는
객체
object
입니다. 문자열과 숫자 같은 원시 타입은
불
변
immutable
입니다. 숫자
5
는 항상 숫자
5
입니다. 문자열
"
alpha
"
도 항상 문자열
"
alpha
"
입니
다. 숫자가 불변임은 분명하지만, 문자열에 대해서는 혼동하는 사람들이 있습니다. 예를 들어
"
alpha
" + "
omega
"
처럼 문자열을 ...
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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.