Add composite example

Author: tshemsedinov

JavaScript/2-composite.js

@@ -0,0 +1,44 @@
+'use strict';
+
+class Product {
+  constructor(name, price) {
+    this.name = name;
+    this.productPrice = price;
+  }
+
+  get price() {
+    return this.productPrice;
+  }
+}
+
+class Purchase {
+  constructor(name, ...collection) {
+    this.name = name;
+    this.collection = collection;
+  }
+
+  get price() {
+    let price = 0;
+    for (const item of this.collection) {
+      price += item.price;
+    }
+    return price;
+  }
+}
+
+// Usage
+
+const p1 = new Product('Laptop', 1500);
+const p2 = new Product('Mouse', 25);
+const p3 = new Product('Keyboard', 100);
+const p4 = new Product('HDMI cable', 10);
+const electronics = new Purchase('Electronics', p1, p2, p3, p4);
+
+const p5 = new Product('Bag', 50);
+const p6 = new Product('Mouse pad', 5);
+const textile = new Purchase('Textile', p5, p6);
+
+const purchase = new Purchase('Work kit', electronics, textile);
+
+console.dir(purchase, { depth: null });
+console.log(`Total is ${purchase.price}`);