9898 - Appear only once

Answer TestCases

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]

Solution

type FindEles<T extends any[], C extends any[] = []> = T extends [
  infer F,
  ...infer R
]
  ? F extends C[number]
    ? FindEles<R, [...C, F]>
    : F extends R[number]
    ? FindEles<R, [...C, F]>
    : [F, ...FindEles<R, [...C, F]>]
  : []