chore: parallelize

controllers/userOrderControl.js

@@ -99,12 +99,12 @@ exports.getRecommendation = async (req, res, next) => {
     const userID = req.params.user_id;
     let orders = await Order.find({ user_id: userID })
       .sort({ createdAt: -1 })
-      .limit(2); // Get the last 5 orders
+      .limit(5); // Get the last 5 orders
     let recommendedItemsSet = new Set();
 
-    // Fetch recommendations for default items
+    // Fetch recommendations for default items in parallel
     const defaultItems = ["Samosa", "Pav Bhaji"];
-    for (let itemName of defaultItems) {
+    const defaultRecommendationsPromises = defaultItems.map(async (itemName) => {
       let foodItemTitleCase = toTitleCase(itemName);
       try {
         const response = await axios.get(
@@ -123,10 +123,10 @@ exports.getRecommendation = async (req, res, next) => {
       } catch (e) {
         console.log(e);
       }
-    }
+    });
 
-    // Process orders for additional recommendations
-    for (let order of orders) {
+    // Process orders for additional recommendations in parallel
+    const ordersRecommendationsPromises = orders.map(async (order) => {
       const item = order.items[0]; // Assuming you want the first item of each order
       const itemName = item.name;
       let foodItemTitleCase = toTitleCase(itemName); // Convert the food item name to Title Case
@@ -148,7 +148,14 @@ exports.getRecommendation = async (req, res, next) => {
       } catch (e) {
         console.log(e);
       }
-    }
+    });
+
+    // Execute default recommendations and orders recommendations in parallel, but don't wait for default recommendations to complete
+    await Promise.all(ordersRecommendationsPromises);
+
+    // After orders recommendations are complete, wait for default recommendations to finish
+    await Promise.all(defaultRecommendationsPromises);
+
     const recommendedItems = Array.from(recommendedItemsSet).map((item) =>
       JSON.parse(item)
     );
@@ -159,6 +166,8 @@ exports.getRecommendation = async (req, res, next) => {
   }
 };
 
+
+
 function toTitleCase(str) {
   return str.replace(/\w\S*/g, function (txt) {
     return txt.charAt(0).toUpperCase() + txt.substr(1).toLowerCase();