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4037 - IsPalindrome #21846

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zhaoyao91 opened this issue Jan 11, 2023 · 1 comment
Open

4037 - IsPalindrome #21846

zhaoyao91 opened this issue Jan 11, 2023 · 1 comment
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4037 answer Share answers/solutions to a question en in English

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@zhaoyao91
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zhaoyao91 commented Jan 11, 2023

type Reverse<T extends string> = 
  T extends `${infer First}${infer Rest}`
  ? `${Reverse<Rest>}${First}`
  : T

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

playground

@zhaoyao91 zhaoyao91 added answer Share answers/solutions to a question en in English labels Jan 11, 2023
@github-actions github-actions bot added the 4037 label Jan 11, 2023
@zhaoyao91
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Here is a tupple version solution which is easier to match the pattern match idea

#20480

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