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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192
러닝 자바스크립트
function
greet
() {
console
.
log
(`
Hello
, ${
user
.
name
}!`);
}
function
getBirthYear
() {
return
new
Date
().
getFullYear
() -
user
.
age
;
}
이 예제에서는
name
과
age
를 없애고 대신
user
를 써서 전역 스코프의 식별자 숫자를 겨우 하
나 줄였을 뿐이지만, 사용자에 관한 정보를
10
가지나
100
가지 보관한다고 상상해 보십시오.
하지만 개선의 여지는 더 남아있습니다. 함수
greet
과
getBirthYear
는 여전히 전역
user
에
의존하며, 이 객체는 어디서든 수정할 수 있습니다. 이 함수들을 고쳐서 전역 스코프에 의존하
지 않게 만들어 봅시다.
function
greet
(
user
) {
console
.
log
(`
Hello
, ${
user
.
name
}!`);
}
function
getBirthYear
(
user
) {
return
new
Date
().
getFullYear
() -
user
.
age
;
}
이제 이 함수들은
모든
스코프에서 호출할 수 있고, 명시적으로
user
를 전달받습니다 (모듈과
객체지향 프로그래밍을 배우면 더 나은 방법이 있습니다 ).
사실 프로그램이 이렇게 단순하다면, 전역 변수를 쓰더라도 문제가 생길 소지는 전혀 없습니
다. 하지만 프로그램이 ...
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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.