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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334
러닝 자바스크립트
16.1.4
다른 진수
2
진수나
8
진수,
16
진수 표현을 원한다면
toString
()
에 기수를 매개변수로 쓰면 됩니다.
const
x
=
12
;
x
.
toString
(); // "
12
" (
10
진수)
x
.
toString
(
10
); // "
12
" (
10
진수)
x
.
toString
(
16
); // "
c
" (
16
진수)
x
.
toString
(
8
); // "
14
" (
8
진수)
x
.
toString
(
2
); // "
1100
" (
2
진수)
16.1.5
고급 숫자 형식
다양한 형식으로 숫자를 표시해야 한다면 자바스크립트 내장 메서드로는 곧 한계에 부딪힙니
다. 주로 필요한 경우는 다음과 같습니다.
●
수천 자리의 아주 큰 숫자
●
괄호를 쓰는 등, 음수 표현을 다르게 해야 하는 경우
●
공학 표기법 (지수 표기법과 비슷합니다. )
●
milli
-,
micro
-,
kilo
-,
mega
- 등의
SI
접두사가 필요한 경우
원한다면 연습문제 삼아 이런 표기법을 제공하는 함수를 만들 수도 있겠지만, 실무에서 사용해
야 한다면
Numeral
.
js
(
http
://
numeraljs
.
com
/
) 라이브러리를 권합니다. 이 라이브러리는
위에서 나열한 기능 외에도 더 많은 기능을 제공합니다.
16.2
상수
Math
객체에는 몇 가지 중요한 상수가 프로퍼티로 내장돼 있습니다.
// 기본적인 상수
Math
.
E
// ...
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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.
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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.