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‎04_functions.js‎

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// 1 Функции
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// Function Declaration
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// function greet(name) {
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// console.log('Привет, ', name)
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// }
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// Function Expression
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// const greet2 = function greet2(name) {
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// console.log('Привет 2, ', name)
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// }
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// greet('Васек')
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// greet2('Серега')
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// console.log(typeof greet)
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// console.dir(greet)
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// 2 Анонимные функции
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// let counter = 0
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// const interval = setInterval(function() {
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// if (counter === 5) {
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// clearInterval(interval) //clearTimeout
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// } else {
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// console.log(++counter)
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// }
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// }, 1000)
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// 3 Стрелочные функции
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// function greet(nameA) {
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// console.log('Привет, ', nameA)
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// }
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// const arrow = (nameA, age) => {
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// console.log('Привет, ', nameA, age)
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// }
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// const arrow2 = nameA => console.log('Привет, ', nameA)
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// // arrow2('Sergey')
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// const pow2 = num => {
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// return num ** 2
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// }
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// const pow3 = num => num ** 2
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// console.log(pow3(5))
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// 4 Параметры по умолчанию
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// const sum = (a = 2, b = a * 2) => a + b
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// console.log(sum())
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// function sumAll(...all) {
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// let result = 0
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// for (let num of all) {
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// result += num
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// }
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// return result
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// }
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// const res = sumAll(1, 2, 3, 4, 5)
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// console.log(res)
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// 5 Замыкания
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// function createMember(nameA) {
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// return function(lastName) {
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// console.log(nameA, lastName)
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// }
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// }
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// const logWithLastName = createMember('Sergey')
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// console.log(logWithLastName('Bagdasaryan'))
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// console.log(logWithLastName('Terentyev'))
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‎05_arrays.js‎

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// Массивы
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const cars = ['Mazda', 'Ford', 'BMW', 'Mersedes']
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// const people = [
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// {name: 'Sergey', budget: 3500},
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// {name: 'Victoria', budget: 3200},
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// {name: 'Elizabeth', budget: 1500},
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// ]
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const fib = [1, 1, 2, 3, 5, 8, 13, 21]
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// console.log(cars)
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// Function
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// function addItemToEnd() {
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// }
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// Method
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// cars.push('Hyundai')
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// console.log(cars)
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// cars.unshift('Lada')
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// console.log(cars)
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// const firstItem = cars.shift()
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// const lastItem = cars.pop()
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// console.log(firstItem)
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// console.log(lastItem)
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// console.log(cars)
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// console.log(cars.reverse())
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// const index = cars.indexOf('BMW')
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// cars[index] = 'Audi'
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// console.log(cars)
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// let foundedPerson
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// for (const person of people) {
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// if (person.budget === 3500) {
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// foundedPerson = person
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// }
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// }
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// console.log(foundedPerson)
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// const index = people.findIndex(function(person) {
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// return person.budget === 3500
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// })
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// console.log(people[index])
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// const person = people.find(function(person) {
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// return person.budget === 35002
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// })
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// console.log(person)
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// const person = people.find(person => person.budget === 3500)
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// console.log(person)
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// console.log(cars.includes('Mazda'))
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// const upperCaseCars = cars.map(car => {
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// return car.toUpperCase()
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// })
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const pow2 = num => num ** 2
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// const sqrt = num => Math.sqrt(num)
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// const pow2Fib = fib.map(pow2).map(Math.sqrt)
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// console.log(pow2Fib)
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// const pow2Fib = fib.map(pow2)
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// const filteredNumbers = pow2Fib.filter(num => num > 20)
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// console.log(pow2Fib)
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// console.log(filteredNumbers)
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// Задача 1
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// const text = 'Я долбаеб и мы учимся в юургу'
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// const reverseText = text.split('')
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// console.log(reverseText)
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// console.log(reverseText.reverse().join(''))
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const people = [
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{name: 'Sergey', budget: 3500},
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{name: 'Victoria', budget: 3200},
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{name: 'Elizabeth', budget: 1500},
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]
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const allBudget = people
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.filter(person => person.budget > 2000)
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.reduce((acc, person) => {
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acc += person.budget
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return acc
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}, 0)
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console.log(allBudget)

‎06_objects.js‎

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// Объекты
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const person = {
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nameA: 'Sergey',
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age: 20,
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isProgrammer: true,
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languages: ['ru', 'en', 'de'],
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// 'complex key': 'Complex value',
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// ['key_' + (1 + 3)]: 'Computed key', // key_4
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greet() {
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console.log('Greetings from Armenia!')
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},
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info() {
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// console.log('this:', this)
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console.info('Информация про человека по имени:', this.nameA)
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}
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}
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// console.log(person.nameA)
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// const ageKey = 'age'
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// console.log(person[ageKey])
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// console.log(person['complex key'])
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// console.log(person)
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// person.greet()
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// person.age++
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// person.languages.push('am')
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// // person['key_4'] = undefined
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// delete person['key_4']
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// console.log(person)
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// console.log(person['key_4'])
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// const name = person.nameA
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// const age = person.age
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// const languages = person.languages
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// const {nameA, age: personAge = 10, languages} = person
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// console.log(person)
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// for (let key in person) {
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// if (person.hasOwnProperty(key)) {
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// console.log('key:', key)
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// console.log('value:', person[key])
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// }
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// }
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// Object.keys(person).forEach((key) => {
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// console.log('key:', key)
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// console.log('value:', person[key])
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// })
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// Context
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// person.info()
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const logger = {
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keys() {
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console.log('Object Keys: ', Object.keys(this))
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},
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keysAndValues() {
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// Object.keys(this).forEach((key) => {
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// console.log(`"${key}": ${this[key]};`)
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// })
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// const self = this
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Object.keys(this).forEach(function(key) {
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console.log(`"${key}": ${this[key]};`)
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}.bind(this))
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},
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withParams(top = false, between = false, bottom = false) {
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if (top) {
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console.log('---- Start ----')
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}
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Object.keys(this).forEach((key, index, array) => {
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console.log(`"${key}": ${this[key]};`)
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if (between && index !== array.length - 1) {
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console.log('--------------')
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}
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})
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if (bottom) {
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console.log('---- End ----')
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}
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}
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}
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// logger.keysAndValues.call(person)
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logger.withParams.call(person, true, true, true)
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logger.withParams.apply(person, [true, true, true])

‎app.js‎

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// 1 Функции
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// Function Declaration
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// function greet(name) {
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// console.log('Привет, ', name)
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// }
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// Function Expression
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// const greet2 = function greet2(name) {
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// console.log('Привет 2, ', name)
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// }
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// greet('Васек')
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// greet2('Серега')
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// console.log(typeof greet)
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// console.dir(greet)
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// 2 Анонимные функции
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// let counter = 0
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// const interval = setInterval(function() {
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// if (counter === 5) {
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// clearInterval(interval) //clearTimeout
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// } else {
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// console.log(++counter)
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// }
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// }, 1000)
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// 3 Стрелочные функции
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