fixes recursion #945

exercises/concept/pizza-order/.docs/about.md

@@ -0,0 +1,9 @@
+### About Recursion
+
+Recursion is a programming technique where a function calls itself to solve smaller instances of the same problem. It’s a powerful tool for breaking down problems that can be divided into smaller, similar sub-problems. However, recursion can quickly run into issues such as **Memory Allocation Errors** or **Maximum Call Stack Size Exceeded** if not handled carefully.
+
+In JavaScript, one important limitation is the **lack of Tail-Call Optimization (TCO)**. Tail-call optimization allows the language engine to reuse the stack frame for recursive calls when they occur at the end of a function. Unfortunately, JavaScript does not support TCO, which means that deeply nested recursive calls can lead to a stack overflow.
+
+### Interesting Facts:
+- Recursion is widely used in problems such as tree traversal, factorial calculation, and Fibonacci sequences.
+- JavaScript does not optimize tail calls, unlike other languages such as Scheme or Haskell.

exercises/concept/pizza-order/pizza-order.js

@@ -1,17 +1,33 @@
 /// <reference path="./global.d.ts" />
+
+import { forEach } from "core-js/core/array"
+
 //
 // @ts-check
 
 /**
  * Determine the price of the pizza given the pizza and optional extras
  *
- * @param {Pizza} pizza name of the pizza to be made
+ * @param {Pizz a} pizza name of the pizza to be made
  * @param {Extra[]} extras list of extras
  *
  * @returns {number} the price of the pizza
  */
 export function pizzaPrice(pizza, ...extras) {
-  throw new Error('Please implement the pizzaPrice function');
+  const PizzaPrice = {
+    Margherita: 7,
+    Caprese: 9,
+    Formaggio: 10,
+  }
+  const extrasPrice = {
+    ExtraSauce: 1,
+    ExtraToppings: 2,
+  }
+  let price = PizzaPrice[pizza]||0
+  for( const extra of extras){
+    price += extrasPrice[extra]||0
+  }
+  return price
 }
 
 /**
@@ -24,5 +40,16 @@ export function pizzaPrice(pizza, ...extras) {
  * @returns {number} the price of the total order
  */
 export function orderPrice(pizzaOrders) {
-  throw new Error('Please implement the orderPrice function');
+  if(pizzaOrders.length === 0){
+    return 0;
+  }
+
+  let totalPrice = 0
+
+  pizzaOrders.forEach(order => {
+    totalPrice += pizzaPrice(order.pizza, ...order.extras) 
+  })
+
+  return totalPrice
+  // throw new Error('Please implement the orderPrice function');
 }