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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207
4
장
패턴 매칭
한 가지 멋지지 않지만 효과 있는 방법은 컬렉션에 대해 먼저 일치시킨 다음,
head
원소에 대한
매치를 내포시켜서
head
의 타입으로부터 리스트의 타입을 결정하는 것이다. 이렇게 하려면 빈
시퀀스도 따로 처리해야 한다.
//
src
/
main
/
scala
/
progscala2
/
patternmatching
/
match
-
types2
.
sc
def doSeqMatch
[
T
](
seq
:
Seq
[
T
]):
String
=
seq match
{
case Nil
=
>
"
Nothing
"
case head
+:
_
=
>
head match
{
case
_
:
Double
=
>
"
Double
"
case
_
:
String
=
>
"
String
"
case
_
=
>
"
Unmatched seq element
"
}
}
for
{
x
<
-
Seq
(
List
(
5
.
5
,
5
.
6
,
5
.
7
),
List
("
a
",
"
b
"),
Nil
)
}
yield
{
x match
{
case seq
:
Seq
[
_
]
=
>
(
s
"
seq
${
doSeqMatch
(
seq
)}",
seq
)
case
_
=
>
("
unknown
!",
x
)
}
}
이 스크립트는
Seq
((
seq
Double
,
List
(
5
.
5
,
5
.
6
,
5
.
7
))
,
(
seq
String
,
List
(
a
,
b
))
,
(
seq
Nothing
,
List
( )))
라고 원하는
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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.