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<?php declare(strict_types=1);
namespace Zalas\Toolbox\Tool;
use Countable;
use IteratorAggregate;
use Traversable;
class Collection implements IteratorAggregate, Countable
{
/**
* @var array
*/
private $elements;
private function __construct(array $elements)
$this->elements = $elements;
}
public static function create(array $elements): Collection
return new self($elements);
public function getIterator(): Traversable
yield from $this->elements;
public function merge(Collection $other): Collection
return self::create(\array_merge($this->elements, $other->elements));
public function filter(callable $f): Collection
return self::create(\array_values(\array_filter($this->elements, $f)));
public function map(callable $f): Collection
return self::create(\array_map($f, $this->elements));
public function reduce($initial, callable $param)
return \array_reduce($this->elements, $param, $initial);
public function toArray(): array
return $this->elements;
public function count(): int
return \count($this->elements);
public function empty(): bool
return empty($this->elements);
jakzal /
toolbox
