HH\Lib\Keyset\partition
Requires the Hack Standard Library to be installed.
Facebook Engineer?
This function is available as Keyset\partition() in Facebook's www repository.
Returns a 2-tuple containing keysets for which the given predicate returned
true and false, respectively
namespace HH\Lib\Keyset;
function partition<Tv as arraykey>(
Traversable<Tv> $traversable,
(function(Tv): bool) $predicate,
): (keyset<Tv>, keyset<Tv>);
Time complexity: O(n * p), where p is the complexity of $predicate
Space complexity: O(n)
Parameters
Traversable<Tv> $traversable(function(Tv): bool) $predicate
Returns
(keyset<Tv>, keyset<Tv>)