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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236
러닝 자바스크립트
c
.
addPassenger
("
Cameron
");
c
.
passengers
; // ["
Alice
", "
Cameron
"]
v
.
deployAirbags
(); //
error
c
.
deployAirbags
(); // "
BWOOSH
!"
c
에서는
deployAirbags
를 호출할 수 있지만,
v
에서는 불가능합니다. 달리 말하면, 상속은 (당
연히 ) 단방향입니다.
Car
클래스의 인스턴스는
Vehicle
클래스의 모든 메서드에 접근할 수 있
지만, 반대는 불가능합니다.
9.2.6
다형성
좀 어려워 보이는
다형성
polymorphism
이란 단어는 객체지향 언어에서 여러 슈퍼클래스의 멤버인
인스턴스를 가리키는 말입니다. 대부분의 객체지향 언어에서 다형성은 특별한 경우에 속합니
다. 자바스크립트는 느슨한 타입을 사용하고 어디서든 객체를 쓸 수 있으므로 (정확한 결과가
보장되진 않지만 ), 어떤 면에서는 자바스크립트의 객체는 모두 다형성을 갖고 있다고 할 수 있
습니다.
자바스크립트 코드를 작성하다 보면 ‘이런 메서드가 있고 저런 메서드가 있으니 아마
그 클래스의 인스턴스일 것이다’처럼 짐작할 때가 많습니다.
Car
예제에 적용해 본다면,
deployAirbags
메서드가 있는 객체는
Car
의 인스턴스라고 생각할 수 있습니다. 물론 아닐 수
도 ...
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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.