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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158
러닝 자바스크립트
비트 연산자를 쓰면 숫자형 값 하나로 이들 플래그를 결합하고, 바꾸고, 읽을 수 있습니다.
let
p
=
FLAG
_
READ
|
FLAG
_
WRITE
; //
0b110
let
hasWrite
=
p
&
FLAG
_
WRITE
; //
0b010
- 참 같은 값
let
hasExecute
=
p
&
FLAG
_
EXECUTE
; //
0b000
- 거짓 같은 값
p
=
p
^
FLAG
_
WRITE
; //
0b100
- - 쓰기 플래그 토글 (이제 쓰기 권한이 없습니다)
p
=
p
^
FLAG
_
WRITE
; //
0b110
- - 쓰기 플래그 토글 (쓰기 권한이 다시 생겼습니다)
// 표현식 하나로 여러 플래그를 동시에 판단할 수도 있습니다.
const
hasReadOrExecute
=
p
& (
FLAG
_
READ
|
FLAG
_
EXECUTE
);
const
hasReadAndExecute
=
p
& (
FLAG
_
READ
|
FLAG
_
EXECUTE
) ===
FLAG
_
READ
|
FLAG
_
EXECUTE
;
hasReadOrExecute
와
hasReadAndExecute
연산자는 그룹으로 묶어야 합니다.
AND
는
OR
보다
우선순위가 높으므로,
OR
연산이
AND
연산보다 먼저 일어나게 하려면 그룹을 써서 우선순위를
강제해야 합니다.
5.9.2
typeof ...
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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.