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This is available as Dict\unique in the www repository.

Returns a new dict in which each value appears exactly once

namespace HH\Lib\Dict;

function unique<Tk as arraykey, Tv as arraykey>(
  KeyedTraversable<Tk, Tv> $traversable,
): dict<Tk, Tv>;

In case of duplicate values, later keys will overwrite the previous ones.

For non-arraykey values, see Dict\unique_by().

Time complexity: O(n) Space complexity: O(n)



  • dict<Tk, Tv>