645 - Diff

645 - Diff

by ZYSzys (@ZYSzys) #中等 #object

题目

获取两个接口类型中的差值属性。

type Foo = {
  a: string;
  b: number;
}
type Bar = {
  a: string;
  c: boolean
}

type Result1 = Diff<Foo,Bar> // { b: number, c: boolean }
type Result2 = Diff<Bar,Foo> // { b: number, c: boolean }

在 Github 上查看：https://tsch.js.org/645/zh-CN

代码

/* _____________ 你的代码 _____________ */

type Diff<O, O1> = {
  [K in Exclude<keyof O, keyof O1> | Exclude<keyof O1, keyof O>]: K extends keyof O ? O[K] : K extends keyof O1 ? O1[K] : never
}

测试用例

/* _____________ 测试用例 _____________ */
import type { Equal, Expect } from '@type-challenges/utils'

type Foo = {
  name: string
  age: string
}
type Bar = {
  name: string
  age: string
  gender: number
}
type Coo = {
  name: string
  gender: number
}

type cases = [
  Expect<Equal<Diff<Foo, Bar>, { gender: number }>>,
  Expect<Equal<Diff<Bar, Foo>, { gender: number }>>,
  Expect<Equal<Diff<Foo, Coo>, { age: string, gender: number }>>,
  Expect<Equal<Diff<Coo, Foo>, { age: string, gender: number }>>,
]

相关链接

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