Magento 2: Show Out of Stock items after in stock items

Question

I want to show Out of Stock items after in stock items. I found solution here, but its for Magento 1.8. I need same for Magento 2.

Answer 1

Please update your code to sort according to current direction (By ASC or By DESC)

  $collection = $subject->getCollection();
  $collection->getSelect()->joinLeft(
         ['_inventory_table' => 'cataloginventory_stock_item'], 
         "_inventory_table.product_id = e.entity_id", ['is_in_stock']
  );
  $collection->getSelect()->order(['is_in_stock ' . $currentDirection]);