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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308
2
부
기본기 다지기
는
Combinators
.
map
을 부분 적용한 새로운 함수를 정의했다.
flist
의 타입은
List
[
Int
]
=
>
List
[
String
]
이다. 따라서
map
을 사용하면
Int
=
>
String
타입의 함수를
List
[
Int
]
=
>
List
[
String
]
타입의 함수로 끌어올릴
lift
수 있다.
우리는 보통
map
을 컬렉션에 대해서는 아무것도 모르는 함수
f
:
A
=
>
B
를 사용해서 원소 타입
이
A
인 컬렉션을 크기가 같고 원소 타입이
B
인 다른 컬렉션으로 변환하는 함수라고 생각한다.
이제는
map
을 평범한 함수
f
:
A
=
>
B
를 새로운 함수
flist
:
List
[
A
] =
>
List
[
B
]
로 끌어올리
는 도구로 볼 수도 있음을 알았다. 비록 리스트를 가지고 설명하긴 했지만, 이는
map
을 지원하
는 모든 컨테이너에 대해 성립한다.
불행히도 스칼라 라이브러리에 있는 일반적인
map
메서드를 가지고는 이런 일을 할 수 없다.
map
이 인스턴스 메서드이기 때문에, 부분 적용을 통해 모든
List
의 인스턴스에 대해 적용 가능
한 끌어올려진 함수를 만들 수 없다.
아마 이는 스칼라가
OOP
와
FP
를 혼용하기 때문에 생겨난 일종의 제약일 것이다. 하지만 우리
가 이야기한 내용은 조금은 드문 경우에 속한다. 대부분의 경우에는 이미 컬렉션이 있고, ...
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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.