实现 Pick 类型， 从类型 T 中挑选部分属性 K 构造新的类型

[keqing77]

type Todo = {
  id:number;
  title: string;
  desc: string;
  completed: boolean;
}

type A = MyPick<Todo, "title" | "completed">

// 实现的效果
type A = {
  title: string;
  completed: boolean;
}

[keqing77]

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

// Pick<Type, Keys>