Trunc

约 126 字小于 1 分钟

2026-02-11

题目

Implement the type version of Math.trunc, which takes string or number and returns the integer part of a number by removing any fractional digits.

For example:

type A = Trunc<12.34> // 12

解题思路

待补充

答案

type Trunc = any

验证

import type { Equal, Expect } from '@type-challenges/utils'

type cases = [
  Expect<Equal<Trunc<0.1>, '0'>>,
  Expect<Equal<Trunc<0.2>, '0'>>,
  Expect<Equal<Trunc<1.234>, '1'>>,
  Expect<Equal<Trunc<12.345>, '12'>>,
  Expect<Equal<Trunc<-5.1>, '-5'>>,
  Expect<Equal<Trunc<'.3'>, '0'>>,
  Expect<Equal<Trunc<'1.234'>, '1'>>,
  Expect<Equal<Trunc<'-.3'>, '-0'>>,
  Expect<Equal<Trunc<'-10.234'>, '-10'>>,
  Expect<Equal<Trunc<10>, '10'>>,
]

参考

无