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type TruncImpl<T extends string> =
  T extends `${infer T1}.${infer T2}`
  ? T1 extends "" ? "0" : T1
  : T
type Trunc<T extends string | number> = TruncImpl<`${T}`>
提出日時2023-09-18 07:40:34
問題Trunc
ユーザーsankantsu
ステータスAccepted
テストケース
import type { Equal, Expect } from '@type-challenges/utils'

type cases = [
  Expect<Equal<Trunc<0.1>, '0'>>,
  Expect<Equal<Trunc<1.234>, '1'>>,
  Expect<Equal<Trunc<12.345>, '12'>>,
  Expect<Equal<Trunc<-5.1>, '-5'>>,
  Expect<Equal<Trunc<'1.234'>, '1'>>,
  Expect<Equal<Trunc<'-10.234'>, '-10'>>,
  Expect<Equal<Trunc<10>, '10'>>,
]