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<?php
/**
* File was created 09.06.2015 06:50
*
* @author Karsten J. Gerber <[email protected]>
*/
namespace PeekAndPoke\Component\Psi\Operation\FullSet;
use PeekAndPoke\Component\Psi\FullSetOperation;
use PeekAndPoke\Component\Psi\Operation\AbstractBinaryFunctionOperation;
class GroupByOperation extends AbstractBinaryFunctionOperation implements FullSetOperation
{
* {@inheritdoc}
public function apply(\Iterator $set)
$ret = [];
$func = $this->function;
foreach ($set as $key => $item) {
$group = $func($item, $key);
$ret[$group][] = $item;
}
return new \ArrayIterator($ret);
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