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<?php
namespace Bdf\Collection\Stream;
use IteratorIterator;
/**
* Implementation of StreamInterface::mapKey() return value
*
* @internal
*/
final class MapKeyStream extends IteratorIterator implements StreamInterface
{
use StreamTrait;
* @var callable
private $transformer;
* MapStream constructor.
* @param StreamInterface $stream
* @param callable $transformer
public function __construct(StreamInterface $stream, callable $transformer)
parent::__construct($stream);
$this->transformer = $transformer;
}
* {@inheritdoc}
#[\ReturnTypeWillChange]
public function key()
$key = parent::key();
return ($this->transformer)($this->current(), $key);
b2pweb /
bdf-collections
