HH\Lib\Keyset\keys

Requires the Hack Standard Library to be installed.

Facebook Engineer?

This function is available as Keyset\keys() in Facebook's www repository.

Returns a new keyset containing the keys of the given KeyedTraversable, maintaining the iteration order

namespace HH\Lib\Keyset;

function keys<Tk as arraykey, Tv>(
  KeyedTraversable<Tk, Tv> $traversable,
): keyset<Tk>;

Parameters