TypeScript Pick и Record
Определение типов:
type Pick<T, K extends keyof T> = {
[P in K]: T[P];
}
type Record<K extends string, T> = {
[P in K]: T;
}Pick
interface Dog {
id?: number;
name: string;
weight: number;
age: number;
}
type Doggy = Pick<Dog, 'id' | 'name' >;
// эквивалентно
type Doggy = {
id?: number;
name: string;
}Record
type ThreeDogProps = Record<'prop1' | 'prop2' | 'prop3', Dog>;
// эквивалентно
type ThreeDogProps = {
prop1: Dog;
prop2: Dog;
prop3: Dog;
}