04037-hard-ispalindrome.ts

// ============= Test Cases =============
import type { Equal, Expect } from './test-utils'

type cases = [
  Expect<Equal<IsPalindrome<'abc'>, false>>,
  Expect<Equal<IsPalindrome<'b'>, true>>,
  Expect<Equal<IsPalindrome<'abca'>, false>>,
  Expect<Equal<IsPalindrome<'abcba'>, true>>,
  Expect<Equal<IsPalindrome<121>, true>>,
  Expect<Equal<IsPalindrome<19260817>, false>>
]

// ============= Your Code Here =============
type ReverseString<T extends string> = T extends `${infer Head}${infer Tail}`
  ? `${ReverseString<Tail>}${Head}`
  : T

type IsPalindrome<T extends string | number> =
  `${T}` extends ReverseString<`${T}`> ? true : false