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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173
6
장
함수
f
(
o
);
console
.
log
(`
f
를 호출한 다음:
o
.
message
= "${
o
.
message
}"`);
이 예제를 실행한 결과는 다음과 같습니다.
f
를 호출하기 전:
o
.
message
= "초기값"
f
내부:
o
.
message
= "새로운 객체!" (할당 후)
f
를 호출한 다음:
o
.
message
="
f
에서 수정함"
이 예제를 이해하는 핵심은 함수 내부의
매개변수
o
와 함수 바깥의 변수
o
가 다르다는 겁니다.
f
를 호출하면 둘은 같은 객체를 가리키지만,
f
내부에서
o
에 할당한 객체는
새로운, 전혀 다른
객체입니다. 함수 바깥의
o
는 여전히 원래 객체를 가리키고 있습니다.
컴퓨터 과학에서는 자바스크립트의 원시 값을
값 타입
value
type
이라고 말합니다. 원시 값을 전달할 때
값이
복사
되기 때문입니다. 객체는
참조 타입
reference
type
이라 부릅니다. 객체를 전달할 때 두 변수는
같은 객체
를 가리키기 때문입니다.
6.3.1
매개변수가 함수를 결정하는가?
여러 언어에서 함수의
시그니처
signature
에는 매개변수가 포함됩니다. 예를 들어
C
언어에서 매개
변수 없는 함수
f
()
는 매개변수가 하나인 함수
f
(
x
)
와 다르고,
f
(
x
)
는 매개변수가 두 개인 함
수
f
(
x
,
y
)
와 다릅니다. 자바스크립트에는 그런 차이가 없습니다. 함수
f
가 있다면 ...
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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.