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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318
2
부
기본기 다지기
scala
>
val list
=
List
(
1
,
2
,
3
,
4
,
5
)
list
:
List
[
Int
]
=
List
(
1
,
2
,
3
,
4
,
5
)
scala
>
(
list scan 10
)
(
_
+
_
)
res0
:
List
[
Int
]
=
List
(
10
,
11
,
13
,
16
,
20
,
25
)
먼저 씨앗값인
10
이 출력된다. 그다음에는 첫 번째 원소에 씨앗값을 더해서
11
이 나오고, 그다
음에는 직전 결과에 두 번째 원소를 더해서
11
+
2
=
13
이 나오고, 이런 계산을 계속 반복한다.
여기서 세 가지
mkString
메서드를 언급한 이유는, 그들이 문자열을 만들어내기 위한
fold
와
reduce
의 특수 버전이기 때문이다. 컬렉션이 기본 제공하는
toString
메서드가 마음에 들지
않으면
mkString
이 유용하다.
6.9
왼쪽 순회와 오른쪽 순회
우리가 나열한 목록에서
fold
와
reduce
가 특정 순회 순서를 보장하지 않았음에 주의하
자. 반면
foldLeft
와
reduceLeft
는 원소를 오른쪽에서 왼쪽으로 순회하며,
foldRight
와
reduceRight
는 원소를 왼쪽에서 오른쪽으로 순회한다.
따라서 정수의 목록을 형식화한 문자열의 목록으로 바꾸는 예제와 같이, 순서를 보존해야 하는
연산에서는
foldLeft
나
foldRight
를 적절히 사용해야 ...
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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.