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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231
5
장
암시
이제
Map
으로 변환하고 싶은 어떤 순회가능 컬렉션이 있다면, 우리가 필요로 하는 암시적 증거
를 컴파일러가 합성하려 한다. 하지만
A
<
: (
T
,
U
)
인 경우, 즉
A
가 실제로 쌍인 경우에만 합성이
가능하다. 그 증거가 참이라면
toMap
을 호출할 수 있고, 단순히 순회가능 컬렉션의 원소를
Map
의 생성자에 넘기면 된다. 반면
A
가 쌍이 아니라면 컴파일러 오류가 발생한다.
scala
>
val l1
=
List
(
1
,
2
,
3
)
l1
:
List
[
Int
]
=
List
(
1
,
2
,
3
)
scala
>
l1
.
toMap
<
console
>
:
9
:
error
:
Cannot prove that Int
<
:
<
(
T
,
U
).
l1
.
toMap
^
scala
>
val l2
=
List
("
one
"
-
>
1
,
"
two
"
-
>
2
,
"
three
"
-
>
3
)
l2
:
List
[(
String
,
Int
)]
=
List
((
one
,
1
),
(
two
,
2
),
(
three
,
3
))
scala
>
l2
.
toMap
res3
:
scala
.
collection
.
immutable
.
Map
[
String
,
Int
]
=
Map
(
one
-
>
1
,
two
-
>
2
,
three
-
>
3
)
따라서 ‘증거’는 오직 타입 제약을 강제하기 위해서만 존재한다. 추가 작업을 수행하는 암시적
값을 우리가 직접 정의할 필요는 없다.
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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.