sblum-symfony--productlist-class-green.php

class ProductList
{
  private $products = [];

  public function __construct(array $productList)
  {
    foreach ($productList as $product) {
      $this->addProduct($product);
    }
  }

  public function addProduct(ProductListInterface $product)
  {
    array_push($this->products, $product);
  }

  public function getListedProducts()
  {
    return array_filter(
      $this->products,
      function (ProductListInterface $product) {
        return $product->isListed();
      }
    );
  }
}