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Length of String

提出詳細

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

type LengthOfString<S extends string> = StringToTuple<S>['length']
提出日時2023-08-11 10:03:18
問題Length of String
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<LengthOfString<''>, 0>>,
  Expect<Equal<LengthOfString<'kumiko'>, 6>>,
  Expect<Equal<LengthOfString<'reina'>, 5>>,
  Expect<Equal<LengthOfString<'Sound! Euphonium'>, 16>>,
]