type-challenges-judge

Type Challenges Judge

Problems

Progress

String to Union

提出詳細

type StringToUnion<T extends string> =
  T extends `${infer F}${infer Rest}`
    ? F | StringToUnion<Rest>
    : never

提出日時	2023-09-11 06:03:54
問題	String to Union
ユーザー	snaka
ステータス	Accepted

テストケース

import type { Equal, Expect } from '@type-challenges/utils'

type cases = [
  Expect<Equal<StringToUnion<''>, never>>,
  Expect<Equal<StringToUnion<'t'>, 't'>>,
  Expect<Equal<StringToUnion<'hello'>, 'h' | 'e' | 'l' | 'l' | 'o'>>,
  Expect<Equal<StringToUnion<'coronavirus'>, 'c' | 'o' | 'r' | 'o' | 'n' | 'a' | 'v' | 'i' | 'r' | 'u' | 's'>>,
]