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)
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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.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.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.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.
437
10
장
스칼라 객체 시스템 I
➏ 입력 관련 인자에 대해
-
i
,
--
in
,
--
input
의 세 가지 선택 사항 중 하나를 받아들인다. 그
뒤에 경로가 인자로 들어간다. 사용자가 경로 (그리고 다른 인자 )를 입력하지 않은 경우 이
case
가 일치하지 않음에 유의하라.
➐ 갱신한 설정값을 가지고, 인자 목록의 꼬리에 대해
pa
를 재귀 호출한다.
➑ 출력 관련 인자에 대해 반복한다.
➒ 인식에 실패한 인자를 오류로 처리한다.
➓
pa
를 호출해서 인자를 처리한다.
입력과 출력 관련 인자가 제대로 들어왔는지 검증한다.
나는 이런 패턴 매치 방식이 특히 우아하면서 간결함을 발견했다.
프로젝트를 빌드하면 이 코드가 컴파일된다. 따라서 이를
sbt
에서 시도해보자.
>
run
-
main progscala2
.
objectsystem
.
CommandArgs
-
f
[
info
]
Running progscala2
.
objectsystem
.
CommandArgs
-
f
Unrecognized argument
-
f
usage
:
java
...
progscala2
.
objectsystem
.
CommandArgs arguments
where the allowed arguments are
:
-
h
|
--
help Show help
-
i
|
--
in
|
--
input path Path for input
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
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.