Programmer || Software Enginering 🚁

Javascript Fundamentals

🎒 What is Javascript and how can I learn it ?

🚤 1. What is a Function in JavaScript?

function add(num1, num2){const sum = num1 + num2;return sum;

const result1 = add(12, 13);// console.log()const result2 = add(35, 7);const finalResult = add(result1, result2);

⏰ 2. What is Abstraction in JavaScript

class Animal { constructor() {} talk() {throw new Error("You must implement talk method");  }}class Cat extends Animal {talk() {console.log("meow meow");  }} class Dog extends Animal {  talks() {console.log("bark bark");} talk() {this.talks();  }}const myCat = new Cat();myCat.talk();const myDog = new Dog();myDog.talk();

🦺 3. What is Argument in Javascript

function add(num1, num2) { console.log([...arguments]);  return num1 + num2 + arguments[2]; }const result = add(2, 3, 5, 7);console.log(result);

📘 4. Definition of Array in #"Permalink: 📘 4. Definition of Array in JavaScript:" href="#-4-definition-of-array-in-javascript">

var friendsAge = [11, 13, 17];var muriChanacurFee = [34, 55, 221, 3];var nayikas = ['Hazrat', "Mitu", "Rahim", "Khadiza"];var oddNumbers = [1, 3, 5, 7, 9];var vowels = ['a', 'e', 'i', 'o', 'u'];// console.log(nayikas.length);var vowelsCount = vowels.length;console.log(vowelsCount)

🦧 5. Binary Search in JavaScript

let numbers = [1, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59];function binarySearch(numbers, target) {let start = 0;let end = numbers.length - 1;while (start <= end) {    let mid = Math.floor((start + end) / 2);    if (numbers[mid] === target) {        console.log('item found in position', mid);        return mid;    }    if (numbers[mid] < target) {        start = mid + 1;    }    if (numbers[mid] > target) {        end = mid - 1;    }}return -1;

🤡 6. Bind method in Javascript

const kibria = {id: 101,money: 5000,name: 'RJ Kibria',treatDey: function (expense) {    this.money = this.money - expense;    console.log('here5555', this);    return this.money;}}const heroBalam = {id: 102,money: 6000,name: 'Hero Balam'}const normalGolam = {id: 102,money: 8000,name: 'Normal Golam'} kibria.treatDey(100); const heroTreatDey = kibria.treatDey.bind(heroBalam); heroTreatDey(500); heroTreatDey(300); heroTreatDey(500); kibria.treatDey(400); const normalTreatDey = kibria.treatDey.bind(normalGolam); normalTreatDey(2000);

👽 7. JavaScript Break and Continue

Break Statement in JavaScript

Continue Statement in JavaScript

const nums = [1, -2, 3, 4, -5, -6, 7, -8, 9];for (let i = 0; i < nums.length; i++) {if (nums[i] > 3) {break;}//console.log(nums[i]);}for (let i = 0; i < nums.length; i++) { if (nums[i] < 0) {continue;}console.log(nums[i]);}

👩‍🚀8. JavaScript Function apply

const normalPerson = {firstName: 'Rahim',lastName: 'Uddin',salary: 15000,getFullName: function(){    console.log(this.firstName, this.lastName);},chargeBill: function(amount, tips, tax){    console.log(this);    this.salary = this.salary - amount - tips - tax;    return this.salary;}

const heroPerson = {firstName: 'Hero',lastName: 'Balam',salary:25000

const friendlyPerson = {firstName: 'Hero',lastName: 'Golam',salary:25000

normalPerson.chargeBill();const heroChargeBill = normalPerson.chargeBill.bind(heroPerson);heroChargeBill(2000);heroChargeBill(3000);console.log(heroPerson.salary);console.log(normalPerson.salary); const friendlyChargeBill = normalPerson.chargeBill.bind(friendlyPerson); friendlyChargeBill(1500); normalPerson.chargeBill.call(heroPerson, 900, 100, 10); normalPerson.chargeBill.call(heroPerson, 3000, 300, 30); console.log(heroPerson.salary); normalPerson.chargeBill.call(friendlyPerson, 5000, 500, 50); console.log(friendlyPerson.salary); console.log(normalPerson.salary); normalPerson.chargeBill.apply(heroPerson, [3000, 300, 30]); normalPerson.chargeBill.apply(heroPerson, [4000, 400, 40]) console.log(heroPerson.salary);

🐲9. JavaScript Class Method

class Hero {constructor(name, power){    this.name = name;    this.power = power;}getPower(){    if(this.power){        return this.power;    }    return 'I have no power';}goForGrocery(budget){    if(this.power && budget > 1000){        console.log(this.getPower())    }    return 'Price is too high, i can not buy';}}Class Methodconst catMan = new Hero('catman', 'Deep Khamsi');console.log(catMan.goForGrocery(100));

🧸10. Javascript Conditional Method

if (isFoodReady == true) {console.log('Mama!! I will eat now.')} // Conditionalvar iphonePrice = 70000;var myBudget = 109500;// if (iphonePrice < myBudget) {//     console.log('Iphone diya pic tule futani marbo!!')// }// if (iphonePrice > myBudget) {// console.log('My Shaomi is the best!!');// }var chickenPice = 180;var myMoney = 850;if (chickenPice < myMoney) {console.log('Yes! murgir Ran khamu ar haddi chabamu');}else {console.log('Smashed potato with Lentil soup')}