Type Challenges Judge

Problems

Progress

IsTuple

提出詳細

type IsTuple<T>
  = T[] extends never[] ? false
  : T extends readonly unknown[]
    ? number extends T['length']
      ? false
      : true
  : false;
提出日時2023-06-04 04:02:25
問題IsTuple
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<IsTuple<[]>, true>>,
  Expect<Equal<IsTuple<[number]>, true>>,
  Expect<Equal<IsTuple<readonly [1]>, true>>,
  Expect<Equal<IsTuple<{ length: 1 }>, false>>,
  Expect<Equal<IsTuple<number[]>, false>>,
  Expect<Equal<IsTuple<never>, false>>,
]