找出目标数组中只出现过一次的元素

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题目

找出目标数组中只出现过一次的元素。例如：输入[1,2,2,3,3,4,5,6,6,6]，输出[1,4,5]

解答

type Has<T extends any[], K> = T extends [infer Left, ...infer Rest]
  ? Equal<Left, K> extends true
    ? true
    : Has<Rest, K>
  : false;

type FindEles<
  T extends any[],
  R extends any[] = [],
  Old extends any[] = []
> = T extends [infer First, ...infer Rest]
  ? Has<[...Rest, ...Old], First> extends true
    ? FindEles<Rest, R, [...Old, First]>
    : FindEles<Rest, [...R, First], [...Old, First]>
  : R;

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// your answers
// solution1：Unable to handle arrays that contain types such as number or any.
type FindEles<
  T extends any[],
  K extends unknown[] = [],
  Res extends unknown[] = []
> = T extends [infer Left, ...infer Rest]
  ? Left extends Rest[number]
    ? FindEles<Rest, [...K, Left], Res>
    : Left extends K[number]
    ? FindEles<Rest, K, Res>
    : FindEles<Rest, K, [...Res, Left]>
  : Res;
// solution2：
type Has<T extends any[], K> = T extends [infer Left, ...infer Rest]
  ? Equal<Left, K> extends true
    ? true
    : Has<Rest, K>
  : false;
type FindEles<
  T extends any[],
  K extends unknown[] = [],
  Res extends unknown[] = []
> = T extends [infer Left, ...infer Rest]
  ? Has<Rest, Left> extends true
    ? FindEles<Rest, [...K, Left], Res>
    : Has<K, Left> extends true
    ? FindEles<Rest, K, Res>
    : FindEles<Rest, K, [...Res, Left]>
  : Res;