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9286 - FirstUniqueCharIndex #25764

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kiki-zjq opened this issue Mar 28, 2023 · 0 comments

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kiki-zjq commented Mar 28, 2023

// your answers
type FirstUniqueCharIndex<T extends string, Cur extends unknown[] = [], Prev extends string = ''> =
  T extends `${infer X}${infer Y}` 
  ? Y extends `${infer A}${X}${infer B}`
    ? FirstUniqueCharIndex<Y, [...Cur, X], `${Prev}${X}`> 
    : Prev extends `${infer A}${X}${infer B}`
      ? FirstUniqueCharIndex<Y, [...Cur, X], `${Prev}${X}`> 
      : Cur['length']
  : -1

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