tsの実装によるさまざまなタイプのツール

2023年4月24日#ts134

AI 翻訳

この記事はAIを通じて中国語から日本語に翻訳されました。原文を表示

AI が生成した要約

1. The code is implementing the Partial type, which allows for optional properties in a given type. 2. The code is implementing the Pick type, which extracts specific properties from a given type. 3. The code is implementing the Extract type, which checks if a type is assignable to another type and returns the original type or never. 4. The code is implementing the Exclude type, which checks if a type is not assignable to another type and returns the original type or never. 5. The code is implementing the Record type, which creates an object type with specified keys and values.

Parital の実装：

typeA={name:string,age:string}

type Parital<T>={
[p in keyof T]?:T[p]
}
// つまり type C=Parital<A>

pick の実装

type example={name:string,age:number,address:string}
type Pick<T,U extends keyof T>={
  [P in U]=T[P]
}
const tiqu:Pick<example,"name"|"age">={}

Extract の実装

type Extract<T,U>=T extends U? T: never

type A=string | number | boolean
type B=string | number

type C=Extract<A,B>
const result:C="214214"
const result2:C=444

Exclude の実装、Extract と同じアイデア

type Exclude<T,U>=T extends U?never :T
type A=string | number | boolean
type B=string | number

type C=Exclude<A,B>
const result:C="214214"  //エラー
const result2:C=true

Record の実装

type Record<K extends string|number|symbol,V>={
[P in K]:V
}
type EX=Record<'name'|'age',string|number>
const res:EX={name:"张三"，age:999}