39-Mapped Types

1. Mapped Types 정리

Partial : 클래스의 프로퍼티 정의를 모두 optional로 만든다
Pick : 특정 프로퍼티만 골라 사용 할 수 있다. (Omit의 반대)
Omit : 특정 프로퍼티만 생략 할 수 있다. (Pick의 반대)
Intersection : 두 타입의 프로퍼티를 모두 모아서 사용 할 수 있다
Composition : Mapped Types를 다양하게 조합해서 중첩 적용 가능하다

2. Partial

1export class CreateUserDto {
2  @IsString()
3  readonly name: string
4
5  @IsEmail()
6  readonly email: string
7
8  @IsString()
9  readonly password: string
10}

1export class UpdateUserDto extends PartialType(CreateUserDto) {}
2/*
3{
4  name?: string;
5  email?: string;
6  password?: string;
7}
8*/

3. Pick

1export class CreateUserDto {
2  @IsString()
3  readonly name: string
4
5  @IsEmail()
6  readonly email: string
7
8  @IsString()
9  readonly password: string
10}

1export class LoginUserDto extends PickType(CreateUserDto, ['email', 'password'] as const) {}
2/*
3{
4  email: string;
5  password: string;
6}
7*/

4. Omit

1export class CreateUserDto {
2  @IsString()
3  readonly name: string
4
5  @IsEmail()
6  readonly email: string
7
8  @IsString()
9  readonly password: string
10}

1export class PublicUserDto extends OmitType(CreateUserDto, ['password'] as const) {}
2/*
3{
4  name: string;
5  email: string;
6}
7*/

5. Intersection

1export class UserDetailDto {
2  @IsString()
3  readonly name: string
4
5  @IsEmail()
6  readonly email: string
7}
8
9export class AddressDto {
10  @IsString()
11  readonly street: string
12
13  @IsString()
14  readonly city: string
15
16  @IsString()
17  readonly country: string
18}

1export class UserWithAddressDto extends IntersectionType(UserDetailDto, AddressDto) {}
2/*
3{
4  name: string;
5  email: string;
6  street: string;
7  city: string;
8  country: string;
9}
10*/

6. Composition

1export class UpdateCatDto extends PartialType(
2  OmitType(CreateCatDto, ['name'] as const), //
3) {}

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