Tuple Filter

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题目

Implement a type FilterOut<T, F> that filters out items of the given type F from the tuple T.

For example,

type Filtered = FilterOut<[1, 2, null, 3], null>; // [1, 2, 3]

解答

type FilterOut<T extends any[], F> = T extends [infer R, ...infer Rest]
  ? [R] extends [F]
    ? FilterOut<Rest, F>
    : [R, ...FilterOut<Rest, F>]
  : [];