[TypeChallenges] 4. Pick (easy)

문제

Implement the built-in Pick<T, K> generic without using it.

Constructs a type by picking the set of properties K from T

 

For example:

interface Todo {
  title: string
  description: string
  completed: boolean
}

type TodoPreview = MyPick<Todo, 'title' | 'completed'>

const todo: TodoPreview = {
    title: 'Clean room',
    completed: false,
}

(출처: https://github.com/type-challenges/type-challenges/blob/main/questions/00004-easy-pick/README.md)

 

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나의 풀이

TypeScript의 내장 유틸리티 타입인 Pick을 직접 구현하는 문제였다!

type MyPick<T, K extends keyof T> = {
  [Key in K]: T[Key]
}

 

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참고자료

1. 제네릭이란?

https://joshua1988.github.io/ts/guide/generics.html

제네릭 | 타입스크립트 핸드북

 

2. Pick이란?

https://joshua1988.github.io/ts/usage/utility.html#%EC%9E%90%EC%A3%BC-%EC%82%AC%EC%9A%A9%EB%90%98%EB%8A%94-%EC%9C%A0%ED%8B%B8%EB%A6%AC%ED%8B%B0-%ED%83%80%EC%9E%85-%EB%AA%87-%EA%B0%9C-%EC%95%8C%EC%95%84%EB%B3%B4%EA%B8%B

유틸리티 타입 | 타입스크립트 핸드북