HH\Lib\Keyset\filter_async
Requires the Hack Standard Library to be installed.
Facebook Engineer?
This function is available as Keyset\gen_filter() in Facebook's www repository.
Returns a new keyset containing only the values for which the given async
predicate returns true
namespace HH\Lib\Keyset;
function filter_async<Tv as arraykey>(
Container<Tv> $traversable,
(function(Tv): Awaitable<bool>) $value_predicate,
): Awaitable<keyset<Tv>>;
For non-async predicates, see Keyset\filter().
Time complexity: O(n * p), where p is the complexity of $value_predicate
Space complexity: O(n)
Parameters
Container<Tv> $traversable(function(Tv): Awaitable<bool>) $value_predicate