Type Challenges Judge

Length of Tuple

提出詳細

type Length<T extends readonly any[]> = T['length']
提出日時2023-12-17 13:15:24
問題Length of Tuple
ユーザーt-hashimoto-sun
ステータスAccepted
テストケース
import type { Equal, Expect } from '@type-challenges/utils' const tesla = ['tesla', 'model 3', 'model X', 'model Y'] as const const spaceX = ['FALCON 9', 'FALCON HEAVY', 'DRAGON', 'STARSHIP', 'HUMAN SPACEFLIGHT'] as const type cases = [ Expect<Equal<Length<typeof tesla>, 4>>, Expect<Equal<Length<typeof spaceX>, 5>>, // @ts-expect-error Length<5>, // @ts-expect-error Length<'hello world'>, ]