February 2022
Beginner to intermediate
784 pages
24h 53m
Korean
Content preview from 자바스크립트 완벽 가이드
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JavaScript
246
8장 함수
·
·
Function()
생성자는 호출될 때마다 함수 바디를 분석하고 새 함수 객체를 생성
합니다. 루프나 자주 호출되는 함수 안에서 생성자를 호출하는 것은 효율적이지
않습니다. 중첩된 함수와 함수 표현식은 루프 안에 있더라도 매번 재컴파일되지
않습니다.
·
·
마지막으로,
Function()
생성자에서 아주 중요한 포인트는 생성자가 만드는 함
수는 어휘적 스코프를 사용하지 않는다는 점입니다. 생성자가 만드는 함수는 항
상 최상위 함수로 컴파일됩니다.
let scope
=
"global";
function constructFunction() {
let scope
=
"local";
return new Function("return scope"); //
로컬
스코프를
캡처하지
않습니다
.
}
//
이
행이
global
을
반환하는
이유는
Function()
생성자가
반환하는
함수는
로컬
스코프를
//
사용하지
않기
때문입니다
.
constructFunction()() //
=
> "global"
Function()
생성자는 전역 스코프를 사용하는
eval()
(4.12.2절)이고 자신만의 비공
개 스코프에 새 변수와 함수를 정의한다고 생각하면 됩니다. 이 생성자를 사용할
일은 아마 없을 겁니다.
8.8
자바스크립트는 리스프(Lisp)나 ...
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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.