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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327
15
장
날짜와 시간
15.9
날짜 비교
날짜
A
와 날짜
B
중 어느 쪽이 더 앞인가 하는 단순한 날짜 비교는 자바스크립트에 내장된 비
교 연산자를 통해 할 수 있습니다.
Date
인스턴스는 날짜를 숫자로 저장하므로, 숫자에 쓸 수
있는 비교 연산자를 그대로 쓰면 됩니다.
const
d1
=
new
Date
(
1996
,
2
,
1
);
const
d2
=
new
Date
(
2009
,
4
,
27
);
d1
>
d2
//
false
d1
<
d2
//
true
15.10
날짜 연산
날짜는 숫자이므로 날짜에서 날짜를 빼면 몇 밀리초가 지났는지 알 수 있습니다.
const
msDiff
=
d2
-
d1
; //
417740400000
ms
const
daysDiff
=
msDiff
/
1000
/
60
/
60
/
24
; //
4834
.
96
days
Array
.
prototype
.
sort
를 써서 날짜를 정렬할 수도 있습니다.
const
dates
= [];
// 랜덤한 날짜를 몇 개 만듭니다.
const
min
=
new
Date
(
2017
,
0
,
1
).
valueOf
();
const
delta
=
new
Date
(
2020
,
0
,
1
).
valueOf
() -
min
;
for
(
let
i
=
0
;
i
<
10
;
i
++)
dates
.
push
(
new
Date
(
min
+
delta
*
Math
.
random
())); ...
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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.