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+// Exercises: Level 3
+
+// Create an object literal called personAccount. It has firstName, lastName, incomes, expenses properties and it has totalIncome, totalExpense, accountInfo,addIncome, addExpense and accountBalance methods. Incomes is a set of incomes and its description and expenses is a set of incomes and its description.
+const personAccount = {
+    firstName: 'fitsum',
+    lastName: 'helina',
+    incomes: [
+      { description: 'Salary', amount: 50000 },
+      { description: 'Bonus', amount: 10000 },
+    ],
+    expenses: [
+      { description: 'Rent', amount: 10000 },
+      { description: 'Groceries', amount: 5000 },
+    ],
+    totalIncome() {
+      return this.incomes.reduce((total, income) => total + income.amount, 0);
+    },
+    totalExpense() {
+      return this.expenses.reduce((total, expense) => total + expense.amount, 0);
+    },
+    accountInfo() {
+      return `Account Information: ${this.firstName} ${this.lastName}`;
+    },
+    addIncome(description, amount) {
+      this.incomes.push({ description, amount });
+    },
+}
+
+// **** Questions:2, 3 and 4 are based on the following two arrays:users and products ()
+
+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,
+  },
+]
+
+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'],
+  },
+]
+// Imagine you are getting the above users collection from a MongoDB database.
+    // 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.
+    // b. Create a function called signIn which allows user to sign in to the application
+
+// The products array has three elements and each of them has six properties.
+    // a. Create a function called rateProduct which rates the product
+    // b. Create a function called averageRating which calculate the average rating of a product
+
+// Create a function called likeProduct. This function will helps to like to the product if it is not liked and remove like if it was liked.
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