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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259
12
장
이터레이터와 제너레이터
이터레이터와 제너레이터
CHAPTER
12
ES6
에서는 매우 중요한 새로운 개념
이터레이터
iterator
와
제너레이터
generator
를 도입했습니다. 제
너레이터는 이터레이터에 의존하는 개념이니 이터레이터부터 시작합시다.
이터레이터는 ‘지금 어디 있는지’ 파악할 수 있도록 돕는다는 면에서 일종의 책갈피와 비슷한
개념입니다. 배열은
이터러블
iterable
객체의 좋은 예입니다. 책에 여러 페이지가 있는 것처럼 배
열에는 여러 요소가 들어 있으므로, 책에 책갈피를 끼울 수 있듯 배열에는 이터레이터를 사용
할 수 있습니다. 책과 책갈피의 비유를 계속 사용해 봅시다.
book
이란 배열이 있고, 이 배열의
각 요소는 책의 한 페이지를 나타내는 문자열이라고 합시다. 지면을 생각해서 루이스 캐럴의
<이상한 나라의 앨리스 >에서 발췌한 ‘반짝 반짝 작은 박쥐’ 원문을 사용하겠습니다. 한 페이지
에 문장 하나씩만 들어 있는 어린이용 동화책을 상상해 보십시오.
const
book
= [
"
Twinkle
,
twinkle
,
little
bat
!",
"
How
I
wonder
what
you
'
re
at
!",
"
Up
above
the
world
you
fly
,",
"
Like
a
tea
tray
in
the
sky
.",
"
Twinkle
,
twinkle ...
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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.