November 2021
Intermediate to advanced
364 pages
9h 52m
Korean
Content preview from 이펙티브 타입스크립트
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Effective
26
1장 타입스크립트 알아보기
runQuery
메서드가 있기 때문에 실제 환경에서도
getAuthors
에
PostgresDB
를
사용할 수 있습니다. 구조적 타이핑 덕분에,
PostgresDB
가
DB
인터페이스를 구
현하는지 명확히 선언할 필요가 없습니다. 타입스크립트는 그렇게 동작할 것
이라는 것을 알아챕니다.
테스트를 작성할 때, 더 간단한 객체를 매개변수로 사용할 수도 있습니다.
test('getAuthors', ()
=
> {
const authors
=
getAuthors({
runQuery(sql: string) {
return [['Toni', 'Morrison'], ['Maya', 'Angelou']];
}
});
expect(authors).toEqual([
{first: 'Toni', last: 'Morrison'},
{first: 'Maya', last: 'Angelou'}
]);
});
타입스크립트는 테스트 DB가 해당 인터페이스를 충족하는지 확인합니다. 그
리고 테스트 코드에는 실제 환경의 데이터베이스에 대한 정보가 불필요합니
다. 심지어 모킹 라이브러리도 필요 없습니다. 추상화(
DB
)를 함으로써, 로직과
테스트를 특정한 구현(
PostgresDB
)으로부터 분리한 것입니다.
테스트 이외에 구조적 타이핑의 또 다른 장점은 라이브러리 ...
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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.