2852 - OmitByType

2852 - OmitByType

by jiangshan (@jiangshanmeta) #中等 #object

题目

From T, pick a set of properties whose type are not assignable to U.

For Example

type OmitBoolean = OmitByType<{
  name: string
  count: number
  isReadonly: boolean
  isEnable: boolean
}, boolean> // { name: string; count: number }

在 Github 上查看：https://tsch.js.org/2852/zh-CN

代码

/* _____________ 你的代码 _____________ */

type OmitByType<T, U> = {
  [K in keyof T as T[K] extends U ? never : K]: T[K]
}

测试用例

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

interface Model {
  name: string
  count: number
  isReadonly: boolean
  isEnable: boolean
}

type cases = [
  Expect<Equal<OmitByType<Model, boolean>, { name: string, count: number }>>,
  Expect<Equal<OmitByType<Model, string>, { count: number, isReadonly: boolean, isEnable: boolean }>>,
  Expect<Equal<OmitByType<Model, number>, { name: string, isReadonly: boolean, isEnable: boolean }>>,
]

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