L0v3ch4n

外观

ValidDate

约 154 字小于 1 分钟

2026-02-11

题目

Implement a type ValidDate, which takes an input type T and returns whether T is a valid date.

Leap year is not considered

Good Luck!

ValidDate<'0102'> // true
ValidDate<'0131'> // true
ValidDate<'1231'> // true
ValidDate<'0229'> // false
ValidDate<'0100'> // false
ValidDate<'0132'> // false
ValidDate<'1301'> // false

解题思路

待补充

答案

type ValidDate<T extends string> = any

验证

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

type cases = [
  Expect<Equal<ValidDate<'0102'>, true>>,
  Expect<Equal<ValidDate<'0131'>, true>>,
  Expect<Equal<ValidDate<'1231'>, true>>,
  Expect<Equal<ValidDate<'0229'>, false>>,
  Expect<Equal<ValidDate<'0100'>, false>>,
  Expect<Equal<ValidDate<'0132'>, false>>,
  Expect<Equal<ValidDate<'1301'>, false>>,
  Expect<Equal<ValidDate<'0123'>, true>>,
  Expect<Equal<ValidDate<'0430'>, true>>,
  Expect<Equal<ValidDate<'01234'>, false>>,
  Expect<Equal<ValidDate<''>, false>>,
]

参考

无