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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412
러닝 자바스크립트
아마 다음과 같은 결과를 볼 거라고 생각할 겁니다.
one
started
first
debugger
! +
0ms
two
started
second
debugger
! +
0ms
one
after
some
time
... +
200ms
two
what
happens
? +
200ms
하지만 실제 보이는 화면은 이렇습니다 (몇 밀리초 오차는 있겠죠 ).
one
started
first
debugger
! +
0ms
two
started
second
debugger
! +
0ms
one
after
some
time
... +
200ms
two
what
happens
? +
0ms
노드는 노드 앱을 실행할 때 어떤 모듈이든 단 한 번만 임포트합니다. 따라서
debug
모듈을 두
번 임포트하더라도, 노드는 해당 모듈을 이미 임포트했음을 인식하고 다시 임포트하지는 않습
니다.
debug1
과
debug2
는 서로 다른 함수이지만, 둘은 같은
lastMessage
를 참조합니다.
이 동작 방법은 안전하며 권장할 만한 방식입니다. 성능, 메모리 사용량, 관리 편의성 등에서
모듈은 단 한 번만 임포트하는 것이 낫습니다.
TIP
npm
의
debug
모듈 역시 우리가 만든 모듈과 비슷한 방법으로 동작합니다. 독립적인 디버그 로그를 여러 개
기록하고 싶다면,
lastMessage
타임스탬프를 모듈이 ...
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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.