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This is available as Keyset\take in the www repository.

Returns a new keyset containing the first $n elements of the given Traversable

namespace HH\Lib\Keyset;

function take<Tv as arraykey>(
  Traversable<Tv> $traversable,
  int $n,
): keyset<Tv>;

If there are duplicate values in the Traversable, the keyset may be shorter than the specified length.

To drop the first $n elements, see Keyset\drop().

Time complexity: O(n), where n is $n Space complexity: O(n), where n is $n



  • keyset<Tv>