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Length of String

提出詳細

type LengthOfString<S extends string, C extends readonly unknown[]=[]> =
  S extends `${infer _}${infer Rest}` ? LengthOfString<Rest, [...C, ""]> : C["length"]
提出日時2025-09-15 02:41:33
問題Length of String
ユーザーbalckowl
ステータスAccepted
テストケース
import type { Equal, Expect } from '@type-challenges/utils'

type cases = [
  Expect<Equal<LengthOfString<''>, 0>>,
  Expect<Equal<LengthOfString<'kumiko'>, 6>>,
  Expect<Equal<LengthOfString<'reina'>, 5>>,
  Expect<Equal<LengthOfString<'Sound! Euphonium'>, 16>>,
]