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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338
러닝 자바스크립트
의사 난수
pseudorandom
number
발생기를 난수
random
number
발생기라 부르는 사람이 많습니다만, 엄밀히 말
하면 틀린 표현입니다. 의사 난수 발생기가 생성하는 난수는 대부분의 애플리케이션에서 랜덤하다고 말할 수
있을 정도로 무작위 하다는 의미로, 진정한 난수를 만드는 건 대단히 어려운 문제입니다.
16.4
삼각함수
[표
16
-
5
]는 사인, 코사인, 탄젠트, 아크 사인, 아크 코사인, 아크 탄젠트입니다. 자바스크립트
의 삼각함수는 모두 라디안 값을 기준으로 합니다.
표
16-5
삼각함수
함수 설명 예제
Math
.
sin
(
x
)
x
의 사인
Math
.
sin
(
Math
.
PI
/
2
) //
1
Math
.
sin
(
Math
.
PI
/
4
) // ~
0
.
707
Math
.
cos
(
x
)
x
의 코사인
Math
.
cos
(
Math
.
PI
) // -
1
Math
.
cos
(
Math
.
PI
/
4
) // ~
0
.
707
Math
.
tan
(
x
)
x
의 탄젠트
Math
.
tan
(
Math
.
PI
/
4
) // ~
1
Math
.
tan
(
0
) //
0
Math
.
asin
(
x
)
x
의 아크사인(결과는 라디안입니다.)
Math
.
asin
(
0
) //
0
Math
.
asin
(
Math
.
SQRT1
_
2
) // ~
0
.
785
Math
.
acos
(
x
)
x
의 아크코사인(결과는 라디안입니다.)
Math
.
acos
(
0
) // ~
1
.
57
+
Math
.
acos
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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.