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外观

IsAlphabet

约 81 字小于 1 分钟

2026-02-11

题目

Determine if the given letter is an alphabet.

解题思路

待补充

答案

type IsAlphabet<S extends string> = any

验证

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

type cases = [
  Expect<Equal<IsAlphabet<'A'>, true>>,
  Expect<Equal<IsAlphabet<'z'>, true>>,
  Expect<Equal<IsAlphabet<'9'>, false>>,
  Expect<Equal<IsAlphabet<'!'>, false>>,
  Expect<Equal<IsAlphabet<'😂'>, false>>,
  Expect<Equal<IsAlphabet<''>, false>>,
]

参考

无