[英]Opposite of “Pick” in Typescript
I am trying to compose a type, which, unlike Pick
, would remove certain properties from the object type. 我正在尝试组合一个类型,与Pick
不同,它会从对象类型中删除某些属性。
It should work this way: 它应该这样工作:
type ObjectType = {
key1: number,
key2: string,
key3: boolean,
key4: number[]
}
let obj: Remove<ObjectType, 'key2' | 'key4'>
Here obj
's type should be: { key1: number, key3: boolean } 这里obj
的类型应该是:{key1:number,key3:boolean}
If we need to remove properties key2
and key4
, this will work: 如果我们需要删除属性key2
和key4
,这将起作用:
type Without<T, K extends keyof T> = Pick<T, Exclude<keyof T, K>>
let obj: Without<ObjectType, 'key2' | 'key4'>
Elaboration: 阐述:
Exclude<keyof T, K>
returns 'key1' | 'key3'
Exclude<keyof T, K>
返回'key1' | 'key3'
'key1' | 'key3'
Pick<T, Exclude<keyof T, K>>
returns the desired result { key1: number, key3: boolean }
Pick<T, Exclude<keyof T, K>>
返回所需的结果{ key1: number, key3: boolean }
As of TypeScript 3.5, there is an Omit
helper that works as you describe. 从TypeScript 3.5开始,有一个Omit
助手可以按照您的描述工作。
type ObjectType = {
key1: number,
key2: string,
key3: boolean,
key4: number[]
}
let obj: Omit<ObjectType, 'key2' | 'key4'> // type is { key1: number, key3: boolean }
For older versions of TypeScript (>2.8), you can use a combination of Pick
and Exclude
as mentioned by Eduard in his answer. 对于旧版本的TypeScript(> 2.8),您可以使用Eduard在其答案中提到的Pick
和Exclude
的组合。
I often make a helper type to make things a bit less verbose (note this is the exact definition used in TS 3.5) 我经常做一个帮助器类型,使事情变得不那么冗长(注意这是TS 3.5中使用的确切定义)
type Omit<T, K extends keyof any> = Pick<T, Exclude<keyof T, K>>;
You can use 'utility-types' Omit generic. 您可以使用'utility-types'忽略泛型。
import { Omit } from "utility-types"
interface IHouse {
rooms: number
gardenSize: number
toilets: number
}
type Appartment = Omit<IHouse, "gardenSize">
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