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<?php
/**
* File was created 06.05.2015 22:14
*
* @author Karsten J. Gerber <[email protected]>
*/
namespace PeekAndPoke\Component\Psi\Operation\FullSet;
use PeekAndPoke\Component\Psi\BinaryFunction;
use PeekAndPoke\Component\Psi\FullSetOperation;
use PeekAndPoke\Component\Psi\UnaryFunction;
class UniqueByOperation implements FullSetOperation
{
/** @var callable|UnaryFunction|BinaryFunction */
protected $mapper;
/** @var bool */
private $strict;
* @param callable|UnaryFunction|BinaryFunction $mapper Mapper function
* @param bool $strict Do strict comparison
public function __construct($mapper, $strict)
$this->mapper = $mapper;
$this->strict = $strict;
}
* {@inheritdoc}
public function apply(\Iterator $set)
$map = $this->mapper;
$result = [];
$known = [];
foreach ($set as $item) {
$mapped = $map($item);
if (! in_array($mapped, $known, $this->strict)) {
$known[] = $mapped;
$result[] = $item;
return new \ArrayIterator($result);
PeekAndPoke /
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