$item = collect(); $item->push($product);
$collection = collect([1,2,3,4]); $collection->each(function($item){ return $item*$item; }); // [1,4,9,16]
$collection = collect([1, 2, 3, 4]); $collection->push(5); $collection->all(); // [1, 2, 3, 4, 5]