July 2017
Beginner to intermediate
464 pages
10h 38m
Korean
Content preview from 러닝 자바스크립트: ES6로 제대로 입문하는 모던 자바스크립트 웹 개발
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135
4
장
제어문
이런 경우를
제어문 중첩
nested
control
flow
이라 부릅니다.
while
루프의 바디에서 할 일은 대부분
else
절에 들어있고,
if
절이 하는 일은
console
.
log
를 호출하는 것뿐입니다.
continue
문을
써서 이 구조를 간결하게 만들 수 있습니다.
while
(
funds
>
1
&&
funds
<
100
) {
let
totalBet
=
rand
(
1
,
funds
);
if
(
totalBet
===
13
) {
console
.
log
("
Unlucky
!
Skip
this
round
....");
continue
;
}
// 플레이...
}
이 단순한 예제에서는 대체 뭐가 좋아졌다는 건지 실감이 잘 안 나겠지만, 루프 바디가
20
행쯤
된다고 생각해 보십시오. 중첩을 제거하면 코드를 읽고 이해하기 쉬워집니다.
4.3.2
break
나
return
문을 써서 불필요한 연산 줄이기
뭔가를 찾기 위해서 루프를 실행했다면, 찾으려는 것을 이미 찾은 후에는 루프 바디를 계속 실
행할 필요가 없습니다.
예를 들어 봅시다. 어떤 숫자가 소수
prime
인지 판단하는 작업은
CPU
부하가 비교적 높은 일 중
하나입니다. 숫자 수천 개의 리스트에서 가장 앞에 있는 소수를 찾는다고 했을 때, 다음 코드는
일단 원하는 작업을 하기는 합니다.
let
firstPrime ...
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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.