Examples for presentation.

sources/Example/Bad/Product.php

@@ -0,0 +1,30 @@
+<?php
+
+namespace Example\Bad;
+
+class Product
+{
+    public string $sku = '';
+    public int $quantity = 0;
+    public float $price = 0;
+
+    public function setSku(string $sku): Product
+    {
+        $this->sku = $sku;
+        return $this;
+    }
+
+    public function setQuantity(int $quantity): Product
+    {
+        $this->quantity = $quantity;
+        return $this;
+    }
+
+    public function setPrice(float $price): Product
+    {
+        $this->price = $price;
+        return $this;
+    }
+
+
+}