3188 - Tuple to Nested Object

3188 - Tuple to Nested Object

by jiangshan (@jiangshanmeta) #中等 #object #tuple

题目

Given a tuple type T that only contains string type, and a type U, build an object recursively.

type a = TupleToNestedObject<['a'], string> // {a: string}
type b = TupleToNestedObject<['a', 'b'], number> // {a: {b: number}}
type c = TupleToNestedObject<[], boolean> // boolean. if the tuple is empty, just return the U type

在 Github 上查看：https://tsch.js.org/3188/zh-CN

代码

/* _____________ 你的代码 _____________ */

type TupleToNestedObject<T extends string[], U> = T extends []
  ? U
  : {
      [P in T[0]]: T extends [P, ...infer R extends string[]] ? TupleToNestedObject<R, U> : never
    }

// type TupleToNestedObject<T extends any[], U> = T extends [infer F, ...infer R]
//   ? F extends string
//     ? { [P in F]: TupleToNestedObject<R, U> }
//     : never
//   : U

测试用例

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

type cases = [
  Expect<Equal<TupleToNestedObject<['a'], string>, { a: string }>>,
  Expect<Equal<TupleToNestedObject<['a', 'b'], number>, { a: { b: number } }>>,
  Expect<Equal<TupleToNestedObject<['a', 'b', 'c'], boolean>, { a: { b: { c: boolean } } }>>,
  Expect<Equal<TupleToNestedObject<[], boolean>, boolean>>,
]

相关链接

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