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String to Union

提出詳細

type Split<T extends string> = T extends `${infer First}${infer Rest}` ? [First, ...Split<Rest>] : []

type StringToUnion<T extends string> = Split<T>[number]

提出日時	2023-08-11 11:56:39
問題	String to Union
ユーザー	tekihei2317
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'>>,
]