Length of Tuple
提出詳細
type Length<T extends ReadonlyArray<unknown>> = T['length']
提出日時 | 2023-04-28 23:55:21 |
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問題 | Length of Tuple |
ユーザー | Dowanna |
ステータス | Accepted |
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'>, ]