Examples for presentation.

sources/Example/Good/VATCalculator.php

@@ -0,0 +1,25 @@
+<?php
+
+namespace Example\Good;
+
+class VATCalculator
+{
+    private float $vat;
+
+    /**
+     * @param float $vat
+     */
+    public function __construct(float $vat)
+    {
+        $this->vat = $vat;
+    }
+
+    /**
+     * @param Product[] $products
+     */
+    public function applyVat(array $products) : void {
+        foreach ($products as $product) {
+            $product->setPrice( $product->price * (1+$this->vat/100) );
+        }
+    }
+}