Flatten
提出詳細
type Flatten<T extends readonly unknown[]> = T extends [infer Head, ...infer Rest] ? [...(Head extends readonly unknown[] ? Flatten<Head> : [Head]), ...Flatten<Rest>] : []
| 提出日時 | 2025-09-15 14:16:35 |
|---|---|
| 問題 | Flatten |
| ユーザー | balckowl |
| ステータス | Accepted |
import type { Equal, Expect } from '@type-challenges/utils' type cases = [ Expect<Equal<Flatten<[]>, []>>, Expect<Equal<Flatten<[1, 2, 3, 4]>, [1, 2, 3, 4]>>, Expect<Equal<Flatten<[1, [2]]>, [1, 2]>>, Expect<Equal<Flatten<[1, 2, [3, 4], [[[5]]]]>, [1, 2, 3, 4, 5]>>, Expect<Equal<Flatten<[{ foo: 'bar'; 2: 10 }, 'foobar']>, [{ foo: 'bar'; 2: 10 }, 'foobar']>>, ]