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StartsWith

提出詳細

type StartsWith<
  T extends string,
  U extends string,
> = T extends `${infer TF}${infer TT}`
  ? U extends `${infer UF}${infer UT}`
    ? Equal<TF, UF> extends true
      ? StartsWith<TT, UT>
      : false
    : true
  : U extends ''
  ? true
  : false;
提出日時2023-05-22 14:27:50
問題StartsWith
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<StartsWith<'abc', 'ac'>, false>>,
  Expect<Equal<StartsWith<'abc', 'ab'>, true>>,
  Expect<Equal<StartsWith<'abc', 'abcd'>, false>>,
  Expect<Equal<StartsWith<'abc', ''>, true>>,
  Expect<Equal<StartsWith<'abc', ' '>, false>>,
]