Task2

.gitignore

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+node_modules

task2.js

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+const express = require('express');
+const dbConnect = require('./mongodb');
+const mongodb = require('mongodb')
+const app = express();
+
+function getAge(birth) {
+    let today = new Date();
+    let curr_date = today.getDate();
+    let curr_month = today.getMonth() + 1;
+    let curr_year = today.getFullYear();
+
+    let pieces = birth.split('-');
+    let birth_date = pieces[2];
+    let birth_month = pieces[1];
+    let birth_year = pieces[0];
+
+    if (curr_month == birth_month && curr_date >= birth_date) return parseInt(curr_year-birth_year);
+    if (curr_month == birth_month && curr_date < birth_date) return parseInt(curr_year-birth_year-1);
+    if (curr_month > birth_month) return parseInt(curr_year-birth_year);
+    if (curr_month < birth_month) return parseInt(curr_year-birth_year-1);
+ }
+
+
+app.get('/age/average', async (req,res)=>{
+
+    let conn = await dbConnect();
+    let data = await conn.collection('UsersProfile');
+    let age=0;
+
+    data = await data.find().toArray();
+
+    for (const i of data) {
+
+        age = age + getAge(i.dob);
+    }
+    age = age/data.length;
+    console.log(age);
+    res.send("Average Age : "+ age.toString());
+});
+
+app.get('/age/delete', async (req,res)=>{
+
+    let conn = await dbConnect();
+    let userProfileData = await conn.collection('UsersProfile');
+    let userData = await conn.collection('Users');
+    let age=0;
+
+    let data = await userProfileData.find().toArray();
+
+    for (const i of data) {
+
+        age = getAge(i.dob);
+        if(age>25){
+            let a = await userProfileData.deleteOne({"_id": new mongodb.ObjectId(i._id)})
+            let b = await userData.deleteOne({"_id": i.user_id})
+            console.log("user deleted");
+        }
+    }
+});
+
+app.listen(5001);