HH\Lib\Dict\filter
Returns a new dict containing only the values for which the given predicate
returns true
namespace HH\Lib\Dict;
function filter<Tk as arraykey, Tv>(
KeyedTraversable<Tk, Tv> $traversable,
?(function(Tv): bool) $value_predicate = NULL,
): dict<Tk, Tv>;
The default predicate is casting the value to boolean.
- To remove null values in a typechecker-visible way, see
Dict\filter_nulls()
. - To use an async predicate, see
Dict\filter_async()
.
Time complexity: O(n * p), where p is the complexity of $value_predicate
(which is O(1) if not provided explicitly)
Space complexity: O(n)
Parameters
KeyedTraversable<Tk,
Tv> $traversable
?(function(Tv): bool) $value_predicate = NULL
Returns
dict<Tk, Tv>