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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148
러닝 자바스크립트
거나 같다 (
<=
), 크다 (
>
), 크거나 같다 (
>=
) 네 가지가 있습니다.
3
>
5
; //
false
3
> =
5
; //
false
3
<
5
; //
true
3
<=
5
; //
true
5
>
5
; //
false
5
> =
5
; //
true
5
<
5
; //
false
5
<=
5
; //
true
5.5
숫자 비교
숫자를 비교할 때는 염두에 두어야 할 것이 있습니다.
먼저, 특별한 숫자형 값
NaN
은 그 자신을 포함하여 무엇과도 같지 않습니다. 즉,
NaN
===
NaN
과
NaN
==
NaN
은 모두
false
입니다. 숫자가
NaN
인지 알아보려면 내장된
isNaN
함수를 사용하
십시오.
isNaN
(
x
)
은
x
가
NaN
일 때
true
를 반환하고 그렇지 않다면
false
를 반환합니다.
자주 얘기하지만, 자바스크립트의 숫자는 모두 더블 형식입니다. 그리고 더블 형식은 근사치이
므로, 자바스크립트에서 숫자를 비교하다 보면 경악스러운 결과를 볼 때가 있습니다.
자바스크립트에서 정수를 비교할 때, 그 정수가 안전한 범위라면 (
Number
.
MIN
_
SAFE
_
INTEGER
이상,
Number
.
MAX
_
SAFE
_
INTEGER
이하 ) 안심하고 일치 연산자를 사용할 수 있습니다. 하지만
소수점이 있는 숫자를 비교할 때는 관계 연산자를 써서 테스트하는 ...
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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.