function groupJoinResultSelectorFunc(Person $person, IEnumerable $pets) : string
{
$petList = $pets->select(function (Pet $pet) {
return $pet->Name;
})->toArray();
return sprintf('Owner: %s; Pets: "%s"', $person->Name, implode('", "', $petList));
}
/**
* Resets that sequence.
*
* @param bool $resetSequence Reset inner sequence or not.
*/
protected function resetMe(bool $resetSequence = true)
{
if ($resetSequence) {
$this->_sequence->reset();
}
$selector = $this->_selector;
// prepare items before ...
$items = $this->_sequence->select(function ($x, IItemContext $ctx) use($selector) {
$result = new \stdClass();
$result->key = $ctx->key();
$result->sortBy = $selector($x, $ctx);
$result->value = $x;
return $result;
})->toArray();
$comparer = $this->_comparer;
\uasort($items, function (\stdClass $x, \stdClass $y) use($comparer) : int {
return $comparer($x->sortBy, $y->sortBy);
});
$this->_i = static::createEnumerable($items)->withNewKeys('($key, $item) => $item->key')->select('$x => $x->value');
}
