diff --git a/exercise-solutions/day1/3.object.html b/exercise-solutions/day1/3.object.html
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+<!DOCTYPE html>
+<html lang="en">
+
+<head>
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <title>Object</title>
+</head>
+
+<body>
+
+</body>
+
+</html>
+<script>
+  //   const users = {
+  //       Alex: {
+  //         email: 'alex@alex.com',
+  //         skills: ['HTML', 'CSS', 'JavaScript'],
+  //         age: 20,
+  //         isLoggedIn: false,
+  //         points: 30
+  //       },
+  //       Asab: {
+  //         email: 'asab@asab.com',
+  //         skills: ['HTML', 'CSS', 'JavaScript', 'Redux', 'MongoDB', 'Express', 'React', 'Node'],
+  //         age: 25,
+  //         isLoggedIn: false,
+  //         points: 50
+  //       },
+  //       Brook: {
+  //         email: 'daniel@daniel.com',
+  //         skills: ['HTML', 'CSS', 'JavaScript', 'React', 'Redux'],
+  //         age: 30,
+  //         isLoggedIn: true,
+  //         points: 50
+  //       },
+  //       Daniel: {
+  //         email: 'daniel@alex.com',
+  //         skills: ['HTML', 'CSS', 'JavaScript', 'Python'],
+  //         age: 20,
+  //         isLoggedIn: false,
+  //         points: 40
+  //       },
+  //       John: {
+  //         email: 'john@john.com',
+  //         skills: ['HTML', 'CSS', 'JavaScript', 'React', 'Redux', 'Node.js'],
+  //         age: 20,
+  //         isLoggedIn: true,
+  //         points: 50
+  //       },
+  //       Thomas: {
+  //         email: 'thomas@thomas.com',
+  //         skills: ['HTML', 'CSS', 'JavaScript', 'React'],
+  //         age: 20,
+  //         isLoggedIn: false,
+  //         points: 40
+  //       },
+  //       Paul: {
+  //         email: 'paul@paul.com',
+  //         skills: ['HTML', 'CSS', 'JavaScript', 'MongoDB', 'Express', 'React', 'Node'],
+  //         age: 20,
+  //         isLoggedIn: false,
+  //         points: 40
+  //       }
+  //     };
+  // //TODO: Find the person who has many skills in the users object.
+  // const copyUsers = Object.assign({},users);
+  // const usersKeys = Object.keys(copyUsers);
+  // const usersValues = Object.values(copyUsers);
+  // const usersEntries = Object.entries(copyUsers);
+  // //   usersValues.forEach(value => {
+  // //   console.log(value.skills)
+  // // });
+
+
+  // usersKeys.forEach(person => {
+  //   // count logged in users, count users having greater than equal to 50 points from the following object.
+  //   // if(copyUsers[person].points >= 50){
+  //   //   console.log(person);
+  //   // }
+
+  //   //Find people who are MERN stack developer from the users object
+  //   const skills = copyUsers[person].skills;
+  //   if(skills.includes('MongoDB') && skills.includes('Express') && skills.includes('React') && skills.includes('Node')){
+  //     console.log("MERN stacker: "+ person);
+  //   }
+  // });
+  // users.Nam = {
+  //   email: 'nam@nam.com',
+  //   skills: ['HTML', 'CSS', 'JavaScript', 'MongoDB', 'Express', 'React', 'Node'],
+  //   age: 20,
+  //   isLoggedIn: false,
+  //   points: 100
+  // };
+  // Set your name in the users object without modifying the original users object
+  // console.log(users);
+
+  //Exercise lv3
+  const users = [
+    {
+      _id: 'ab12ex',
+      username: 'Alex',
+      email: 'alex@alex.com',
+      password: '123123',
+      createdAt: '08/01/2020 9:00 AM',
+      isLoggedIn: false,
+    },
+    {
+      _id: 'fg12cy',
+      username: 'Asab',
+      email: 'asab@asab.com',
+      password: '123456',
+      createdAt: '08/01/2020 9:30 AM',
+      isLoggedIn: true,
+    },
+    {
+      _id: 'zwf8md',
+      username: 'Brook',
+      email: 'brook@brook.com',
+      password: '123111',
+      createdAt: '08/01/2020 9:45 AM',
+      isLoggedIn: true,
+    },
+    {
+      _id: 'eefamr',
+      username: 'Martha',
+      email: 'martha@martha.com',
+      password: '123222',
+      createdAt: '08/01/2020 9:50 AM',
+      isLoggedIn: false,
+    },
+    {
+      _id: 'ghderc',
+      username: 'Thomas',
+      email: 'thomas@thomas.com',
+      password: '123333',
+      createdAt: '08/01/2020 10:00 AM',
+      isLoggedIn: false,
+    }
+  ]
+  // .a.Create a function called signUp which allows user to add to the collection.If user exists, inform the user that he has already an account.
+  function signUp(user) {
+    for (let i = 0; i < users.length; i++) {
+      const usr = users[i];
+      if (usr[username] === user[username]) {
+        console.log('The user is already existed');
+        break;
+      }
+      users.push(user);
+    };
+  }
+
+  function signIn(user) {
+    user.isLoggedIn = true;
+  }
+
+
+  signIn(users[4]);
+  console.log(users[4]);
+
+  const products = [
+    {
+      _id: 'eedfcf',
+      name: 'mobile phone',
+      description: 'Huawei Honor',
+      price: 200,
+      ratings: [
+        { userId: 'fg12cy', rate: 5 },
+        { userId: 'zwf8md', rate: 4.5 },
+      ],
+      likes: [],
+    },
+    {
+      _id: 'aegfal',
+      name: 'Laptop',
+      description: 'MacPro: System Darwin',
+      price: 2500,
+      ratings: [],
+      likes: ['fg12cy'],
+    },
+    {
+      _id: 'hedfcg',
+      name: 'TV',
+      description: 'Smart TV:Procaster',
+      price: 400,
+      ratings: [{ userId: 'fg12cy', rate: 5 }],
+      likes: ['fg12cy'],
+    },
+  ]
+  // a. Create a function called rateProduct which rates the product 
+  function rateProduct(userId, rate, proId) {
+    for (let i = 0; i < products.length; i++) {
+      const pro = products[i];
+      if (pro[_id] === proId) {
+        pro[ratings].push({ userId, rate });
+        break;
+      }
+    }
+  }
+  //b. Create a function called averageRating which calculate the average rating of a product
+  function likeProduct(userId, proId) {
+    for (let i = 0; i < products.length; i++) {
+      const pro = products[i];
+      if (pro[_id] === proId) {
+        pro[likes].push(userId);
+        break;
+      }
+    }
+  }
+</script>
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