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# Day 7 - Functions
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## [Exercise:Solutions](#exercise-solutions)
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- ### [Exercise:Level 1](#exercises-level-1)
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- ### [Exercise:Level 2](#exercises-level-2)
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- ### [Exercise:Level 3](#exercises-level-3) <hr>
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#### [Home](../README.md) | [<< Day 6](./06_day_loops.md) | [Day 8 >>](./08_day_object.md)
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## Exercise Solutions
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### Exercises Level 1
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1. Create an empty object called dog
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```js
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//app.js
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dog = {}
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```
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2. Print the the dog object on the console
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```js
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//app.js
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dog = {}
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console.log(dog)
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```
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3. Add name, legs, color, age and bark properties for the dog object. The bark property is a method which return woof woof
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```js
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//app.js
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dog = {
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name:'garip',
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legs:4,
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age:6,
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color:'black',
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bark:'woof woof'
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}
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console.log(dog)
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```
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4. Get name, legs, color, age and bark value from the dog object
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```js
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//app.js
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dog = {
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name:'garip',
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legs:4,
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age:6,
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color:'black',
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bark:'woof woof'
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}
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console.log(dog.name)
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console.log(dog.legs)
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console.log(dog['age'])
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console.log(dog['color'])
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console.log(dog['bark'])
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```
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5. Set new properties the dog object: breed, getDogInfo
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```js
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//app.js
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dog = {
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name:'garip',
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legs:4,
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age:6,
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color:'black',
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bark:'woof woof'
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}
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dog.breed = 'kangal'
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console.log(dog.breed)
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```
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### Exercises Level 2
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1. Find the person who has many skills in the users object.
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```js
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//app.js
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let maxSkills = 0;
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let mostSkilledUser = "";
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for (let user in users) {
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if (users[user].skills.length > maxSkills) {
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maxSkills = users[user].skills.length;
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mostSkilledUser = user;
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}
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}
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console.log(mostSkilledUser + " isimli kullanıcının yetenek sayısı: " + maxSkills);
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```
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2. Count logged in users, count users having greater than equal to 50 points from the following object.
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```js
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const users = {
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Alex: {
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email: 'alex@alex.com',
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skills: ['HTML', 'CSS', 'JavaScript'],
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age: 20,
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isLoggedIn: false,
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points: 30
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},
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Asab: {
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email: 'asab@asab.com',
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skills: ['HTML', 'CSS', 'JavaScript', 'Redux', 'MongoDB', 'Express', 'React', 'Node'],
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age: 25,
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isLoggedIn: false,
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points: 50
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},
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Brook: {
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email: 'daniel@daniel.com',
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skills: ['HTML', 'CSS', 'JavaScript', 'React', 'Redux'],
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age: 30,
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isLoggedIn: true,
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points: 50
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},
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Daniel: {
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email: 'daniel@alex.com',
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skills: ['HTML', 'CSS', 'JavaScript', 'Python'],
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age: 20,
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isLoggedIn: false,
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points: 40
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},
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John: {
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email: 'john@john.com',
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skills: ['HTML', 'CSS', 'JavaScript', 'React', 'Redux', 'Node.js'],
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age: 20,
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isLoggedIn: true,
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points: 50
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},
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Thomas: {
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email: 'thomas@thomas.com',
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skills: ['HTML', 'CSS', 'JavaScript', 'React'],
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age: 20,
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isLoggedIn: false,
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points: 40
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},
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Paul: {
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email: 'paul@paul.com',
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skills: ['HTML', 'CSS', 'JavaScript', 'MongoDB', 'Express', 'React', 'Node'],
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age: 20,
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isLoggedIn: false,
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points: 40
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}
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}
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let pointsIsFifty = 0;
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for (let user in users) {
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if (users[user].points == 50) {
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pointsIsFifty++;
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}
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}
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console.log(pointsIsFifty);
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```
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3. Find people who are MERN stack developer from the users object
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```js
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//app.js
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let mernStackDevelopers = [];
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for (let user in users) {
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if (users[user].skills.includes('MongoDB', 'Express', 'React', 'Node')) {
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mernStackDevelopers.push(user);
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}
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}
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console.log(mernStackDevelopers)
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```
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4. Set your name in the users object without modifying the original users object
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```js
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//app.js
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const myName = "Nevzat";
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const newUsers = {...users, [myName]: {email: 'bing@microsoft.com', skills: ['search', 'AI'], age: 3, isLoggedIn: true, points: 100}};
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console.log(newUsers);
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```
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5. Get all keys or properties of users object
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```js
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//app.js
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const keys = Object.keys(users);
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console.log(keys);
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```
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6. Get all the values of users object
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```js
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//app.js
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const value = Object.keys(users);
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console.log(value);
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```
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7. Use the countries object to print a country name, capital, populations and languages.
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```js
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//app.js
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for(let country in countries){
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console.log(country)
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console.log(countries[country].capital)
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console.log(countries[country].populations)
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console.log(countries[country].langue)
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}
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```
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### Exercises Level 3
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1. 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.
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```js
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//app.js
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const personAccount = {
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firstName: "Nevzat",
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lastName: "Atalay",
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incomes: [
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{description: "Maaş", amount: 5000},
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{description: "Kira", amount: 1000},
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{description: "Yatırım", amount: 2000}
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],
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expenses: [
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{description: "Kira", amount: 500},
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{description: "Yemek", amount: 200},
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{description: "Eğlence", amount: 100}
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],
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totalIncome: function() {
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let sum = 0;
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for (let i = 0; i < this.incomes.length; i++) {
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sum += this.incomes[i].amount;
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}
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return sum;
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},
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totalExpense: function() {
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let sum = 0;
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for (let i = 0; i < this.expenses.length; i++) {
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sum += this.expenses[i].amount;
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}
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return sum;
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},
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accountInfo: function() {
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return "Hesap sahibi: " + this.firstName + " " + this.lastName + "\nToplam gelir: " + this.totalIncome() + "\nToplam gider: " + this.totalExpense();
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},
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addIncome: function(description, amount) {
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this.incomes.push({description: description, amount: amount});
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},
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addExpense: function(description, amount) {
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this.expenses.push({description: description, amount: amount});
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},
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accountBalance: function() {
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return this.totalIncome() - this.totalExpense();
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}
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};
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console.log(personAccount.accountInfo());
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personAccount.addIncome("Bonus", 1000);
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personAccount.addExpense("Kira", 750);
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console.log(personAccount.accountBalance());
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```
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2. **** Questions:2, 3 and 4 are based on the following two arrays:users and products ()
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```js
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const users = [
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{
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_id: 'ab12ex',
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username: 'Alex',
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email: 'alex@alex.com',
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password: '123123',
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createdAt:'08/01/2020 9:00 AM',
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isLoggedIn: false
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},
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{
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_id: 'fg12cy',
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username: 'Asab',
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email: 'asab@asab.com',
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password: '123456',
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createdAt:'08/01/2020 9:30 AM',
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isLoggedIn: true
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},
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{
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_id: 'zwf8md',
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username: 'Brook',
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email: 'brook@brook.com',
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password: '123111',
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createdAt:'08/01/2020 9:45 AM',
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isLoggedIn: true
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},
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{
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_id: 'eefamr',
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username: 'Martha',
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email: 'martha@martha.com',
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password: '123222',
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createdAt:'08/01/2020 9:50 AM',
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isLoggedIn: false
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},
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{
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_id: 'ghderc',
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username: 'Thomas',
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email: 'thomas@thomas.com',
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password: '123333',
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createdAt:'08/01/2020 10:00 AM',
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isLoggedIn: false
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}
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];
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const products = [
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{
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_id: 'eedfcf',
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name: 'mobile phone',
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description: 'Huawei Honor',
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price: 200,
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ratings: [
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{ userId: 'fg12cy', rate: 5 },
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{ userId: 'zwf8md', rate: 4.5 }
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],
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likes: []
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},
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{
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_id: 'aegfal',
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name: 'Laptop',
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description: 'MacPro: System Darwin',
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price: 2500,
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ratings: [],
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likes: ['fg12cy']
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},
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{
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_id: 'hedfcg',
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name: 'TV',
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description: 'Smart TV:Procaster',
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price: 400,
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ratings: [{ userId: 'fg12cy', rate: 5 }],
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likes: ['fg12cy']
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}
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]
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```
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Imagine you are getting the above users collection from a MongoDB database.
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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.
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b. Create a function called signIn which allows user to sign in to the application
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3. The products array has three elements and each of them has six properties.
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a. Create a function called rateProduct which rates the product
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b. Create a function called averageRating which calculate the average rating of a product
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4. 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. |
