/**
* Filter a list by calling a callback on each element.
*
* If the callback returns true, then the element will be added to the
* resulting array. Otherwise, it will be skipped.
*
* Also, unlike array_filter, this function preserves indexes.
*
* @param callable $function
* @param array|Traversable $traversable
*
* @return array
*/
public static function filter(callable $function, $traversable)
{
Arguments::define(Boa::func(), Boa::traversable())->check($function, $traversable);
$aggregation = [];
foreach ($traversable as $key => $value) {
if ($function($value, $key)) {
$aggregation[$key] = $value;
}
}
return $aggregation;
}
