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<?php
namespace Underscore\Mutator;
use Underscore\Collection;
use Underscore\Functions;
use Underscore\Mutator;
class CompactMutator extends Mutator
{
/**
* Removes all falsey values.
*
* @param Collection $collection
* @return Collection
*/
public function __invoke($collection)
$filter = new FilterMutator();
return $filter($collection, Functions::nop());
}