JavaScript: Correct Syntax and Rules for Adding Items to Cart - $(item_id).closest('.qcart_item').each() Explanation

The correct syntax and rules to achieve the desired functionality would be as follows:\n\nfunction qq_single_add_itemX(item_id, item_qty, data_count) {\n var validate = '';\n var qq_order_items = [];\n \n $(item_id).closest('.qcart_item').each(function() {\n // Your code here\n });\n}