Type Challenges Judge

Problems

Progress

Length of String

提出詳細

type LengthOfString<S extends string, A extends unknown[] = []> =
  S extends `${infer _}${infer Tail}`
    ? LengthOfString<Tail, [...A, unknown]>
    : A['length'];
提出日時2023-06-01 03:39:05
問題Length of String
ユーザーmrsekut
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>>,
]