July 2016
Beginner to intermediate
776 pages
17h 26m
Korean
Content preview from 프로그래밍 스칼라: 실용적인 스칼라 활용법을 익히는 가장 확실한 실전 바이블 (2.11.x 버전 기반)
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388
2
부
기본기 다지기
해준다는 것도 배웠다. 구현하는 방법을 보지 못한 연산자가 하나 있는데, 바로 단항 연산자
unary
operator
다.
예제는 음수 연산이다. 복소수 클래스를 정의하는 경우
-
c
와 같은 어떤 인스턴스의 음수를 어떻
게 지원할 수 있을까? 다음은 그 방법을 보여준다.
//
src
/
main
/
scala
/
progscala2
/
basicoop
/
Complex
.
sc
case class Complex
(
real
:
Double
,
imag
:
Double
)
{
def unary
_
-
:
Complex
=
Complex
(
-
real
,
imag
)
//
➊
def
-
(
other
:
Complex
)
=
Complex
(
real
-
other
.
real
,
imag
-
other
.
imag
)
}
val c1
=
Complex
(
1
.
1
,
2
.
2
)
val c2
=
-
c1
//
Complex
(
-
1
.
1
,
2
.
2
)
val c3
=
c1
.
unary
_
-
//
Complex
(
-
1
.
1
,
2
.
2
)
val c4
=
c1
-
Complex
(
0
.
5
,
1
.
0
)
//
Complex
(
0
.
6
,
1
.
2
)
➊ 메서드 이름이
unary
_
X
다. 여기서
X
는 우리가 사용하고 싶은 연산자 문자로, 여기서는
-
다.
-
와
:
사이에 공백이 있음에 유의하라. 이 공백은 메서드 이름이
-
로 끝나고,
:
로 끝나지 않음을
컴파일러에 ...
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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.